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vis.js is a dynamic, browser-based visualization library
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jrtechs-vis/lib/graph3d/Graph3d.js

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var Emitter = require('emitter-component');
var DataSet = require('../DataSet');
var DataView = require('../DataView');
var util = require('../util');
var Point3d = require('./Point3d');
var Point2d = require('./Point2d');
var Camera = require('./Camera');
var Filter = require('./Filter');
var Slider = require('./Slider');
var StepNumber = require('./StepNumber');
/**
* @constructor Graph3d
* Graph3d displays data in 3d.
*
* Graph3d is developed in javascript as a Google Visualization Chart.
*
* @param {Element} container The DOM element in which the Graph3d will
* be created. Normally a div element.
* @param {DataSet | DataView | Array} [data]
* @param {Object} [options]
*/
function Graph3d(container, data, options) {
if (!(this instanceof Graph3d)) {
throw new SyntaxError('Constructor must be called with the new operator');
}
// create variables and set default values
this.containerElement = container;
this.width = '400px';
this.height = '400px';
this.margin = 10; // px
this.defaultXCenter = '55%';
this.defaultYCenter = '50%';
this.xLabel = 'x';
this.yLabel = 'y';
this.zLabel = 'z';
var passValueFn = function(v) { return v; };
this.xValueLabel = passValueFn;
this.yValueLabel = passValueFn;
this.zValueLabel = passValueFn;
this.filterLabel = 'time';
this.legendLabel = 'value';
this.style = Graph3d.STYLE.DOT;
this.showPerspective = true;
this.showGrid = true;
this.keepAspectRatio = true;
this.showShadow = false;
this.showGrayBottom = false; // TODO: this does not work correctly
this.showTooltip = false;
this.verticalRatio = 0.5; // 0.1 to 1.0, where 1.0 results in a 'cube'
this.animationInterval = 1000; // milliseconds
this.animationPreload = false;
this.camera = new Camera();
this.camera.setArmRotation(1.0, 0.5);
this.camera.setArmLength(1.7);
this.eye = new Point3d(0, 0, -1); // TODO: set eye.z about 3/4 of the width of the window?
this.dataTable = null; // The original data table
this.dataPoints = null; // The table with point objects
// the column indexes
this.colX = undefined;
this.colY = undefined;
this.colZ = undefined;
this.colValue = undefined;
this.colFilter = undefined;
this.xMin = 0;
this.xStep = undefined; // auto by default
this.xMax = 1;
this.yMin = 0;
this.yStep = undefined; // auto by default
this.yMax = 1;
this.zMin = 0;
this.zStep = undefined; // auto by default
this.zMax = 1;
this.valueMin = 0;
this.valueMax = 1;
this.xBarWidth = 1;
this.yBarWidth = 1;
// TODO: customize axis range
// colors
this.axisColor = '#4D4D4D';
this.gridColor = '#D3D3D3';
this.dataColor = {
fill: '#7DC1FF',
stroke: '#3267D2',
strokeWidth: 1 // px
};
this.dotSizeRatio = 0.02; // size of the dots as a fraction of the graph width
// create a frame and canvas
this.create();
// apply options (also when undefined)
this.setOptions(options);
// apply data
if (data) {
this.setData(data);
}
}
// Extend Graph3d with an Emitter mixin
Emitter(Graph3d.prototype);
/**
* Calculate the scaling values, dependent on the range in x, y, and z direction
*/
Graph3d.prototype._setScale = function() {
this.scale = new Point3d(1 / (this.xMax - this.xMin),
1 / (this.yMax - this.yMin),
1 / (this.zMax - this.zMin));
// keep aspect ration between x and y scale if desired
if (this.keepAspectRatio) {
if (this.scale.x < this.scale.y) {
//noinspection JSSuspiciousNameCombination
this.scale.y = this.scale.x;
}
else {
//noinspection JSSuspiciousNameCombination
this.scale.x = this.scale.y;
}
}
// scale the vertical axis
this.scale.z *= this.verticalRatio;
// TODO: can this be automated? verticalRatio?
// determine scale for (optional) value
this.scale.value = 1 / (this.valueMax - this.valueMin);
// position the camera arm
var xCenter = (this.xMax + this.xMin) / 2 * this.scale.x;
var yCenter = (this.yMax + this.yMin) / 2 * this.scale.y;
var zCenter = (this.zMax + this.zMin) / 2 * this.scale.z;
this.camera.setArmLocation(xCenter, yCenter, zCenter);
};
/**
* Convert a 3D location to a 2D location on screen
* http://en.wikipedia.org/wiki/3D_projection
* @param {Point3d} point3d A 3D point with parameters x, y, z
* @return {Point2d} point2d A 2D point with parameters x, y
*/
Graph3d.prototype._convert3Dto2D = function(point3d) {
var translation = this._convertPointToTranslation(point3d);
return this._convertTranslationToScreen(translation);
};
/**
* Convert a 3D location its translation seen from the camera
* http://en.wikipedia.org/wiki/3D_projection
* @param {Point3d} point3d A 3D point with parameters x, y, z
* @return {Point3d} translation A 3D point with parameters x, y, z This is
* the translation of the point, seen from the
* camera
*/
Graph3d.prototype._convertPointToTranslation = function(point3d) {
var ax = point3d.x * this.scale.x,
ay = point3d.y * this.scale.y,
az = point3d.z * this.scale.z,
cx = this.camera.getCameraLocation().x,
cy = this.camera.getCameraLocation().y,
cz = this.camera.getCameraLocation().z,
// calculate angles
sinTx = Math.sin(this.camera.getCameraRotation().x),
cosTx = Math.cos(this.camera.getCameraRotation().x),
sinTy = Math.sin(this.camera.getCameraRotation().y),
cosTy = Math.cos(this.camera.getCameraRotation().y),
sinTz = Math.sin(this.camera.getCameraRotation().z),
cosTz = Math.cos(this.camera.getCameraRotation().z),
// calculate translation
dx = cosTy * (sinTz * (ay - cy) + cosTz * (ax - cx)) - sinTy * (az - cz),
dy = sinTx * (cosTy * (az - cz) + sinTy * (sinTz * (ay - cy) + cosTz * (ax - cx))) + cosTx * (cosTz * (ay - cy) - sinTz * (ax-cx)),
dz = cosTx * (cosTy * (az - cz) + sinTy * (sinTz * (ay - cy) + cosTz * (ax - cx))) - sinTx * (cosTz * (ay - cy) - sinTz * (ax-cx));
return new Point3d(dx, dy, dz);
};
/**
* Convert a translation point to a point on the screen
* @param {Point3d} translation A 3D point with parameters x, y, z This is
* the translation of the point, seen from the
* camera
* @return {Point2d} point2d A 2D point with parameters x, y
*/
Graph3d.prototype._convertTranslationToScreen = function(translation) {
var ex = this.eye.x,
ey = this.eye.y,
ez = this.eye.z,
dx = translation.x,
dy = translation.y,
dz = translation.z;
// calculate position on screen from translation
var bx;
var by;
if (this.showPerspective) {
bx = (dx - ex) * (ez / dz);
by = (dy - ey) * (ez / dz);
}
else {
bx = dx * -(ez / this.camera.getArmLength());
by = dy * -(ez / this.camera.getArmLength());
}
// shift and scale the point to the center of the screen
// use the width of the graph to scale both horizontally and vertically.
return new Point2d(
this.xcenter + bx * this.frame.canvas.clientWidth,
this.ycenter - by * this.frame.canvas.clientWidth);
};
/**
* Set the background styling for the graph
* @param {string | {fill: string, stroke: string, strokeWidth: string}} backgroundColor
*/
Graph3d.prototype._setBackgroundColor = function(backgroundColor) {
var fill = 'white';
var stroke = 'gray';
var strokeWidth = 1;
if (typeof(backgroundColor) === 'string') {
fill = backgroundColor;
stroke = 'none';
strokeWidth = 0;
}
else if (typeof(backgroundColor) === 'object') {
if (backgroundColor.fill !== undefined) fill = backgroundColor.fill;
if (backgroundColor.stroke !== undefined) stroke = backgroundColor.stroke;
if (backgroundColor.strokeWidth !== undefined) strokeWidth = backgroundColor.strokeWidth;
}
else if (backgroundColor === undefined) {
// use use defaults
}
else {
throw 'Unsupported type of backgroundColor';
}
this.frame.style.backgroundColor = fill;
this.frame.style.borderColor = stroke;
this.frame.style.borderWidth = strokeWidth + 'px';
this.frame.style.borderStyle = 'solid';
};
/// enumerate the available styles
Graph3d.STYLE = {
BAR: 0,
BARCOLOR: 1,
BARSIZE: 2,
DOT : 3,
DOTLINE : 4,
DOTCOLOR: 5,
DOTSIZE: 6,
GRID : 7,
LINE: 8,
SURFACE : 9
};
/**
* Retrieve the style index from given styleName
* @param {string} styleName Style name such as 'dot', 'grid', 'dot-line'
* @return {Number} styleNumber Enumeration value representing the style, or -1
* when not found
*/
Graph3d.prototype._getStyleNumber = function(styleName) {
switch (styleName) {
case 'dot': return Graph3d.STYLE.DOT;
case 'dot-line': return Graph3d.STYLE.DOTLINE;
case 'dot-color': return Graph3d.STYLE.DOTCOLOR;
case 'dot-size': return Graph3d.STYLE.DOTSIZE;
case 'line': return Graph3d.STYLE.LINE;
case 'grid': return Graph3d.STYLE.GRID;
case 'surface': return Graph3d.STYLE.SURFACE;
case 'bar': return Graph3d.STYLE.BAR;
case 'bar-color': return Graph3d.STYLE.BARCOLOR;
case 'bar-size': return Graph3d.STYLE.BARSIZE;
}
return -1;
};
/**
* Determine the indexes of the data columns, based on the given style and data
* @param {DataSet} data
* @param {Number} style
*/
Graph3d.prototype._determineColumnIndexes = function(data, style) {
if (this.style === Graph3d.STYLE.DOT ||
this.style === Graph3d.STYLE.DOTLINE ||
this.style === Graph3d.STYLE.LINE ||
this.style === Graph3d.STYLE.GRID ||
this.style === Graph3d.STYLE.SURFACE ||
this.style === Graph3d.STYLE.BAR) {
// 3 columns expected, and optionally a 4th with filter values
this.colX = 0;
this.colY = 1;
this.colZ = 2;
this.colValue = undefined;
if (data.getNumberOfColumns() > 3) {
this.colFilter = 3;
}
}
else if (this.style === Graph3d.STYLE.DOTCOLOR ||
this.style === Graph3d.STYLE.DOTSIZE ||
this.style === Graph3d.STYLE.BARCOLOR ||
this.style === Graph3d.STYLE.BARSIZE) {
// 4 columns expected, and optionally a 5th with filter values
this.colX = 0;
this.colY = 1;
this.colZ = 2;
this.colValue = 3;
if (data.getNumberOfColumns() > 4) {
this.colFilter = 4;
}
}
else {
throw 'Unknown style "' + this.style + '"';
}
};
Graph3d.prototype.getNumberOfRows = function(data) {
return data.length;
}
Graph3d.prototype.getNumberOfColumns = function(data) {
var counter = 0;
for (var column in data[0]) {
if (data[0].hasOwnProperty(column)) {
counter++;
}
}
return counter;
}
Graph3d.prototype.getDistinctValues = function(data, column) {
var distinctValues = [];
for (var i = 0; i < data.length; i++) {
if (distinctValues.indexOf(data[i][column]) == -1) {
distinctValues.push(data[i][column]);
}
}
return distinctValues;
}
Graph3d.prototype.getColumnRange = function(data,column) {
var minMax = {min:data[0][column],max:data[0][column]};
for (var i = 0; i < data.length; i++) {
if (minMax.min > data[i][column]) { minMax.min = data[i][column]; }
if (minMax.max < data[i][column]) { minMax.max = data[i][column]; }
}
return minMax;
};
/**
* Initialize the data from the data table. Calculate minimum and maximum values
* and column index values
* @param {Array | DataSet | DataView} rawData The data containing the items for the Graph.
* @param {Number} style Style Number
*/
Graph3d.prototype._dataInitialize = function (rawData, style) {
var me = this;
// unsubscribe from the dataTable
if (this.dataSet) {
this.dataSet.off('*', this._onChange);
}
if (rawData === undefined)
return;
if (Array.isArray(rawData)) {
rawData = new DataSet(rawData);
}
var data;
if (rawData instanceof DataSet || rawData instanceof DataView) {
data = rawData.get();
}
else {
throw new Error('Array, DataSet, or DataView expected');
}
if (data.length == 0)
return;
this.dataSet = rawData;
this.dataTable = data;
// subscribe to changes in the dataset
this._onChange = function () {
me.setData(me.dataSet);
};
this.dataSet.on('*', this._onChange);
// _determineColumnIndexes
// getNumberOfRows (points)
// getNumberOfColumns (x,y,z,v,t,t1,t2...)
// getDistinctValues (unique values?)
// getColumnRange
// determine the location of x,y,z,value,filter columns
this.colX = 'x';
this.colY = 'y';
this.colZ = 'z';
this.colValue = 'style';
this.colFilter = 'filter';
// check if a filter column is provided
if (data[0].hasOwnProperty('filter')) {
if (this.dataFilter === undefined) {
this.dataFilter = new Filter(rawData, this.colFilter, this);
this.dataFilter.setOnLoadCallback(function() {me.redraw();});
}
}
var withBars = this.style == Graph3d.STYLE.BAR ||
this.style == Graph3d.STYLE.BARCOLOR ||
this.style == Graph3d.STYLE.BARSIZE;
// determine barWidth from data
if (withBars) {
if (this.defaultXBarWidth !== undefined) {
this.xBarWidth = this.defaultXBarWidth;
}
else {
var dataX = this.getDistinctValues(data,this.colX);
this.xBarWidth = (dataX[1] - dataX[0]) || 1;
}
if (this.defaultYBarWidth !== undefined) {
this.yBarWidth = this.defaultYBarWidth;
}
else {
var dataY = this.getDistinctValues(data,this.colY);
this.yBarWidth = (dataY[1] - dataY[0]) || 1;
}
}
// calculate minimums and maximums
var xRange = this.getColumnRange(data,this.colX);
if (withBars) {
xRange.min -= this.xBarWidth / 2;
xRange.max += this.xBarWidth / 2;
}
this.xMin = (this.defaultXMin !== undefined) ? this.defaultXMin : xRange.min;
this.xMax = (this.defaultXMax !== undefined) ? this.defaultXMax : xRange.max;
if (this.xMax <= this.xMin) this.xMax = this.xMin + 1;
this.xStep = (this.defaultXStep !== undefined) ? this.defaultXStep : (this.xMax-this.xMin)/5;
var yRange = this.getColumnRange(data,this.colY);
if (withBars) {
yRange.min -= this.yBarWidth / 2;
yRange.max += this.yBarWidth / 2;
}
this.yMin = (this.defaultYMin !== undefined) ? this.defaultYMin : yRange.min;
this.yMax = (this.defaultYMax !== undefined) ? this.defaultYMax : yRange.max;
if (this.yMax <= this.yMin) this.yMax = this.yMin + 1;
this.yStep = (this.defaultYStep !== undefined) ? this.defaultYStep : (this.yMax-this.yMin)/5;
var zRange = this.getColumnRange(data,this.colZ);
this.zMin = (this.defaultZMin !== undefined) ? this.defaultZMin : zRange.min;
this.zMax = (this.defaultZMax !== undefined) ? this.defaultZMax : zRange.max;
if (this.zMax <= this.zMin) this.zMax = this.zMin + 1;
this.zStep = (this.defaultZStep !== undefined) ? this.defaultZStep : (this.zMax-this.zMin)/5;
if (this.colValue !== undefined) {
var valueRange = this.getColumnRange(data,this.colValue);
this.valueMin = (this.defaultValueMin !== undefined) ? this.defaultValueMin : valueRange.min;
this.valueMax = (this.defaultValueMax !== undefined) ? this.defaultValueMax : valueRange.max;
if (this.valueMax <= this.valueMin) this.valueMax = this.valueMin + 1;
}
// set the scale dependent on the ranges.
this._setScale();
};
/**
* Filter the data based on the current filter
* @param {Array} data
* @return {Array} dataPoints Array with point objects which can be drawn on screen
*/
Graph3d.prototype._getDataPoints = function (data) {
// TODO: store the created matrix dataPoints in the filters instead of reloading each time
var x, y, i, z, obj, point;
var dataPoints = [];
if (this.style === Graph3d.STYLE.GRID ||
this.style === Graph3d.STYLE.SURFACE) {
// copy all values from the google data table to a matrix
// the provided values are supposed to form a grid of (x,y) positions
// create two lists with all present x and y values
var dataX = [];
var dataY = [];
for (i = 0; i < this.getNumberOfRows(data); i++) {
x = data[i][this.colX] || 0;
y = data[i][this.colY] || 0;
if (dataX.indexOf(x) === -1) {
dataX.push(x);
}
if (dataY.indexOf(y) === -1) {
dataY.push(y);
}
}
var sortNumber = function (a, b) {
return a - b;
};
dataX.sort(sortNumber);
dataY.sort(sortNumber);
// create a grid, a 2d matrix, with all values.
var dataMatrix = []; // temporary data matrix
for (i = 0; i < data.length; i++) {
x = data[i][this.colX] || 0;
y = data[i][this.colY] || 0;
z = data[i][this.colZ] || 0;
var xIndex = dataX.indexOf(x); // TODO: implement Array().indexOf() for Internet Explorer
var yIndex = dataY.indexOf(y);
if (dataMatrix[xIndex] === undefined) {
dataMatrix[xIndex] = [];
}
var point3d = new Point3d();
point3d.x = x;
point3d.y = y;
point3d.z = z;
obj = {};
obj.point = point3d;
obj.trans = undefined;
obj.screen = undefined;
obj.bottom = new Point3d(x, y, this.zMin);
dataMatrix[xIndex][yIndex] = obj;
dataPoints.push(obj);
}
// fill in the pointers to the neighbors.
for (x = 0; x < dataMatrix.length; x++) {
for (y = 0; y < dataMatrix[x].length; y++) {
if (dataMatrix[x][y]) {
dataMatrix[x][y].pointRight = (x < dataMatrix.length-1) ? dataMatrix[x+1][y] : undefined;
dataMatrix[x][y].pointTop = (y < dataMatrix[x].length-1) ? dataMatrix[x][y+1] : undefined;
dataMatrix[x][y].pointCross =
(x < dataMatrix.length-1 && y < dataMatrix[x].length-1) ?
dataMatrix[x+1][y+1] :
undefined;
}
}
}
}
else { // 'dot', 'dot-line', etc.
// copy all values from the google data table to a list with Point3d objects
for (i = 0; i < data.length; i++) {
point = new Point3d();
point.x = data[i][this.colX] || 0;
point.y = data[i][this.colY] || 0;
point.z = data[i][this.colZ] || 0;
if (this.colValue !== undefined) {
point.value = data[i][this.colValue] || 0;
}
obj = {};
obj.point = point;
obj.bottom = new Point3d(point.x, point.y, this.zMin);
obj.trans = undefined;
obj.screen = undefined;
dataPoints.push(obj);
}
}
return dataPoints;
};
/**
* Create the main frame for the Graph3d.
* This function is executed once when a Graph3d object is created. The frame
* contains a canvas, and this canvas contains all objects like the axis and
* nodes.
*/
Graph3d.prototype.create = function () {
// remove all elements from the container element.
while (this.containerElement.hasChildNodes()) {
this.containerElement.removeChild(this.containerElement.firstChild);
}
this.frame = document.createElement('div');
this.frame.style.position = 'relative';
this.frame.style.overflow = 'hidden';
// create the graph canvas (HTML canvas element)
this.frame.canvas = document.createElement( 'canvas' );
this.frame.canvas.style.position = 'relative';
this.frame.appendChild(this.frame.canvas);
//if (!this.frame.canvas.getContext) {
{
var noCanvas = document.createElement( 'DIV' );
noCanvas.style.color = 'red';
noCanvas.style.fontWeight = 'bold' ;
noCanvas.style.padding = '10px';
noCanvas.innerHTML = 'Error: your browser does not support HTML canvas';
this.frame.canvas.appendChild(noCanvas);
}
this.frame.filter = document.createElement( 'div' );
this.frame.filter.style.position = 'absolute';
this.frame.filter.style.bottom = '0px';
this.frame.filter.style.left = '0px';
this.frame.filter.style.width = '100%';
this.frame.appendChild(this.frame.filter);
// add event listeners to handle moving and zooming the contents
var me = this;
var onmousedown = function (event) {me._onMouseDown(event);};
var ontouchstart = function (event) {me._onTouchStart(event);};
var onmousewheel = function (event) {me._onWheel(event);};
var ontooltip = function (event) {me._onTooltip(event);};
// TODO: these events are never cleaned up... can give a 'memory leakage'
util.addEventListener(this.frame.canvas, 'keydown', onkeydown);
util.addEventListener(this.frame.canvas, 'mousedown', onmousedown);
util.addEventListener(this.frame.canvas, 'touchstart', ontouchstart);
util.addEventListener(this.frame.canvas, 'mousewheel', onmousewheel);
util.addEventListener(this.frame.canvas, 'mousemove', ontooltip);
// add the new graph to the container element
this.containerElement.appendChild(this.frame);
};
/**
* Set a new size for the graph
* @param {string} width Width in pixels or percentage (for example '800px'
* or '50%')
* @param {string} height Height in pixels or percentage (for example '400px'
* or '30%')
*/
Graph3d.prototype.setSize = function(width, height) {
this.frame.style.width = width;
this.frame.style.height = height;
this._resizeCanvas();
};
/**
* Resize the canvas to the current size of the frame
*/
Graph3d.prototype._resizeCanvas = function() {
this.frame.canvas.style.width = '100%';
this.frame.canvas.style.height = '100%';
this.frame.canvas.width = this.frame.canvas.clientWidth;
this.frame.canvas.height = this.frame.canvas.clientHeight;
// adjust with for margin
this.frame.filter.style.width = (this.frame.canvas.clientWidth - 2 * 10) + 'px';
};
/**
* Start animation
*/
Graph3d.prototype.animationStart = function() {
if (!this.frame.filter || !this.frame.filter.slider)
throw 'No animation available';
this.frame.filter.slider.play();
};
/**
* Stop animation
*/
Graph3d.prototype.animationStop = function() {
if (!this.frame.filter || !this.frame.filter.slider) return;
this.frame.filter.slider.stop();
};
/**
* Resize the center position based on the current values in this.defaultXCenter
* and this.defaultYCenter (which are strings with a percentage or a value
* in pixels). The center positions are the variables this.xCenter
* and this.yCenter
*/
Graph3d.prototype._resizeCenter = function() {
// calculate the horizontal center position
if (this.defaultXCenter.charAt(this.defaultXCenter.length-1) === '%') {
this.xcenter =
parseFloat(this.defaultXCenter) / 100 *
this.frame.canvas.clientWidth;
}
else {
this.xcenter = parseFloat(this.defaultXCenter); // supposed to be in px
}
// calculate the vertical center position
if (this.defaultYCenter.charAt(this.defaultYCenter.length-1) === '%') {
this.ycenter =
parseFloat(this.defaultYCenter) / 100 *
(this.frame.canvas.clientHeight - this.frame.filter.clientHeight);
}
else {
this.ycenter = parseFloat(this.defaultYCenter); // supposed to be in px
}
};
/**
* Set the rotation and distance of the camera
* @param {Object} pos An object with the camera position. The object
* contains three parameters:
* - horizontal {Number}
* The horizontal rotation, between 0 and 2*PI.
* Optional, can be left undefined.
* - vertical {Number}
* The vertical rotation, between 0 and 0.5*PI
* if vertical=0.5*PI, the graph is shown from the
* top. Optional, can be left undefined.
* - distance {Number}
* The (normalized) distance of the camera to the
* center of the graph, a value between 0.71 and 5.0.
* Optional, can be left undefined.
*/
Graph3d.prototype.setCameraPosition = function(pos) {
if (pos === undefined) {
return;
}
if (pos.horizontal !== undefined && pos.vertical !== undefined) {
this.camera.setArmRotation(pos.horizontal, pos.vertical);
}
if (pos.distance !== undefined) {
this.camera.setArmLength(pos.distance);
}
this.redraw();
};
/**
* Retrieve the current camera rotation
* @return {object} An object with parameters horizontal, vertical, and
* distance
*/
Graph3d.prototype.getCameraPosition = function() {
var pos = this.camera.getArmRotation();
pos.distance = this.camera.getArmLength();
return pos;
};
/**
* Load data into the 3D Graph
*/
Graph3d.prototype._readData = function(data) {
// read the data
this._dataInitialize(data, this.style);
if (this.dataFilter) {
// apply filtering
this.dataPoints = this.dataFilter._getDataPoints();
}
else {
// no filtering. load all data
this.dataPoints = this._getDataPoints(this.dataTable);
}
// draw the filter
this._redrawFilter();
};
/**
* Replace the dataset of the Graph3d
* @param {Array | DataSet | DataView} data
*/
Graph3d.prototype.setData = function (data) {
this._readData(data);
this.redraw();
// start animation when option is true
if (this.animationAutoStart && this.dataFilter) {
this.animationStart();
}
};
/**
* Update the options. Options will be merged with current options
* @param {Object} options
*/
Graph3d.prototype.setOptions = function (options) {
var cameraPosition = undefined;
this.animationStop();
if (options !== undefined) {
// retrieve parameter values
if (options.width !== undefined) this.width = options.width;
if (options.height !== undefined) this.height = options.height;
if (options.xCenter !== undefined) this.defaultXCenter = options.xCenter;
if (options.yCenter !== undefined) this.defaultYCenter = options.yCenter;
if (options.filterLabel !== undefined) this.filterLabel = options.filterLabel;
if (options.legendLabel !== undefined) this.legendLabel = options.legendLabel;
if (options.xLabel !== undefined) this.xLabel = options.xLabel;
if (options.yLabel !== undefined) this.yLabel = options.yLabel;
if (options.zLabel !== undefined) this.zLabel = options.zLabel;
if (options.xValueLabel !== undefined) this.xValueLabel = options.xValueLabel;
if (options.yValueLabel !== undefined) this.yValueLabel = options.yValueLabel;
if (options.zValueLabel !== undefined) this.zValueLabel = options.zValueLabel;
if (options.dotSizeRatio !== undefined) this.dotSizeRatio = options.dotSizeRatio;
if (options.style !== undefined) {
var styleNumber = this._getStyleNumber(options.style);
if (styleNumber !== -1) {
this.style = styleNumber;
}
}
if (options.showGrid !== undefined) this.showGrid = options.showGrid;
if (options.showPerspective !== undefined) this.showPerspective = options.showPerspective;
if (options.showShadow !== undefined) this.showShadow = options.showShadow;
if (options.tooltip !== undefined) this.showTooltip = options.tooltip;
if (options.showAnimationControls !== undefined) this.showAnimationControls = options.showAnimationControls;
if (options.keepAspectRatio !== undefined) this.keepAspectRatio = options.keepAspectRatio;
if (options.verticalRatio !== undefined) this.verticalRatio = options.verticalRatio;
if (options.animationInterval !== undefined) this.animationInterval = options.animationInterval;
if (options.animationPreload !== undefined) this.animationPreload = options.animationPreload;
if (options.animationAutoStart !== undefined)this.animationAutoStart = options.animationAutoStart;
if (options.xBarWidth !== undefined) this.defaultXBarWidth = options.xBarWidth;
if (options.yBarWidth !== undefined) this.defaultYBarWidth = options.yBarWidth;
if (options.xMin !== undefined) this.defaultXMin = options.xMin;
if (options.xStep !== undefined) this.defaultXStep = options.xStep;
if (options.xMax !== undefined) this.defaultXMax = options.xMax;
if (options.yMin !== undefined) this.defaultYMin = options.yMin;
if (options.yStep !== undefined) this.defaultYStep = options.yStep;
if (options.yMax !== undefined) this.defaultYMax = options.yMax;
if (options.zMin !== undefined) this.defaultZMin = options.zMin;
if (options.zStep !== undefined) this.defaultZStep = options.zStep;
if (options.zMax !== undefined) this.defaultZMax = options.zMax;
if (options.valueMin !== undefined) this.defaultValueMin = options.valueMin;
if (options.valueMax !== undefined) this.defaultValueMax = options.valueMax;
if (options.backgroundColor !== undefined) this._setBackgroundColor(options.backgroundColor);
if (options.cameraPosition !== undefined) cameraPosition = options.cameraPosition;
if (cameraPosition !== undefined) {
this.camera.setArmRotation(cameraPosition.horizontal, cameraPosition.vertical);
this.camera.setArmLength(cameraPosition.distance);
}
// colors
if (options.axisColor !== undefined) this.axisColor = options.axisColor;
if (options.gridColor !== undefined) this.gridColor = options.gridColor;
if (options.dataColor) {
if (typeof options.dataColor === 'string') {
this.dataColor.fill = options.dataColor;
this.dataColor.stroke = options.dataColor;
}
else {
if (options.dataColor.fill) {
this.dataColor.fill = options.dataColor.fill;
}
if (options.dataColor.stroke) {
this.dataColor.stroke = options.dataColor.stroke;
}
if (options.dataColor.strokeWidth !== undefined) {
this.dataColor.strokeWidth = options.dataColor.strokeWidth;
}
}
}
}
this.setSize(this.width, this.height);
// re-load the data
if (this.dataTable) {
this.setData(this.dataTable);
}
// start animation when option is true
if (this.animationAutoStart && this.dataFilter) {
this.animationStart();
}
};
/**
* Redraw the Graph.
*/
Graph3d.prototype.redraw = function() {
if (this.dataPoints === undefined) {
throw 'Error: graph data not initialized';
}
this._resizeCanvas();
this._resizeCenter();
this._redrawSlider();
this._redrawClear();
this._redrawAxis();
if (this.style === Graph3d.STYLE.GRID ||
this.style === Graph3d.STYLE.SURFACE) {
this._redrawDataGrid();
}
else if (this.style === Graph3d.STYLE.LINE) {
this._redrawDataLine();
}
else if (this.style === Graph3d.STYLE.BAR ||
this.style === Graph3d.STYLE.BARCOLOR ||
this.style === Graph3d.STYLE.BARSIZE) {
this._redrawDataBar();
}
else {
// style is DOT, DOTLINE, DOTCOLOR, DOTSIZE
this._redrawDataDot();
}
this._redrawInfo();
this._redrawLegend();
};
/**
* Clear the canvas before redrawing
*/
Graph3d.prototype._redrawClear = function() {
var canvas = this.frame.canvas;
var ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, canvas.width, canvas.height);
};
/**
* Redraw the legend showing the colors
*/
Graph3d.prototype._redrawLegend = function() {
var y;
if (this.style === Graph3d.STYLE.DOTCOLOR ||
this.style === Graph3d.STYLE.DOTSIZE) {
var dotSize = this.frame.clientWidth * this.dotSizeRatio;
var widthMin, widthMax;
if (this.style === Graph3d.STYLE.DOTSIZE) {
widthMin = dotSize / 2; // px
widthMax = dotSize / 2 + dotSize * 2; // Todo: put this in one function
}
else {
widthMin = 20; // px
widthMax = 20; // px
}
var height = Math.max(this.frame.clientHeight * 0.25, 100);
var top = this.margin;
var right = this.frame.clientWidth - this.margin;
var left = right - widthMax;
var bottom = top + height;
}
var canvas = this.frame.canvas;
var ctx = canvas.getContext('2d');
ctx.lineWidth = 1;
ctx.font = '14px arial'; // TODO: put in options
if (this.style === Graph3d.STYLE.DOTCOLOR) {
// draw the color bar
var ymin = 0;
var ymax = height; // Todo: make height customizable
for (y = ymin; y < ymax; y++) {
var f = (y - ymin) / (ymax - ymin);
//var width = (dotSize / 2 + (1-f) * dotSize * 2); // Todo: put this in one function
var hue = f * 240;
var color = this._hsv2rgb(hue, 1, 1);
ctx.strokeStyle = color;
ctx.beginPath();
ctx.moveTo(left, top + y);
ctx.lineTo(right, top + y);
ctx.stroke();
}
ctx.strokeStyle = this.axisColor;
ctx.strokeRect(left, top, widthMax, height);
}
if (this.style === Graph3d.STYLE.DOTSIZE) {
// draw border around color bar
ctx.strokeStyle = this.axisColor;
ctx.fillStyle = this.dataColor.fill;
ctx.beginPath();
ctx.moveTo(left, top);
ctx.lineTo(right, top);
ctx.lineTo(right - widthMax + widthMin, bottom);
ctx.lineTo(left, bottom);
ctx.closePath();
ctx.fill();
ctx.stroke();
}
if (this.style === Graph3d.STYLE.DOTCOLOR ||
this.style === Graph3d.STYLE.DOTSIZE) {
// print values along the color bar
var gridLineLen = 5; // px
var step = new StepNumber(this.valueMin, this.valueMax, (this.valueMax-this.valueMin)/5, true);
step.start();
if (step.getCurrent() < this.valueMin) {
step.next();
}
while (!step.end()) {
y = bottom - (step.getCurrent() - this.valueMin) / (this.valueMax - this.valueMin) * height;
ctx.beginPath();
ctx.moveTo(left - gridLineLen, y);
ctx.lineTo(left, y);
ctx.stroke();
ctx.textAlign = 'right';
ctx.textBaseline = 'middle';
ctx.fillStyle = this.axisColor;
ctx.fillText(step.getCurrent(), left - 2 * gridLineLen, y);
step.next();
}
ctx.textAlign = 'right';
ctx.textBaseline = 'top';
var label = this.legendLabel;
ctx.fillText(label, right, bottom + this.margin);
}
};
/**
* Redraw the filter
*/
Graph3d.prototype._redrawFilter = function() {
this.frame.filter.innerHTML = '';
if (this.dataFilter) {
var options = {
'visible': this.showAnimationControls
};
var slider = new Slider(this.frame.filter, options);
this.frame.filter.slider = slider;
// TODO: css here is not nice here...
this.frame.filter.style.padding = '10px';
//this.frame.filter.style.backgroundColor = '#EFEFEF';
slider.setValues(this.dataFilter.values);
slider.setPlayInterval(this.animationInterval);
// create an event handler
var me = this;
var onchange = function () {
var index = slider.getIndex();
me.dataFilter.selectValue(index);
me.dataPoints = me.dataFilter._getDataPoints();
me.redraw();
};
slider.setOnChangeCallback(onchange);
}
else {
this.frame.filter.slider = undefined;
}
};
/**
* Redraw the slider
*/
Graph3d.prototype._redrawSlider = function() {
if ( this.frame.filter.slider !== undefined) {
this.frame.filter.slider.redraw();
}
};
/**
* Redraw common information
*/
Graph3d.prototype._redrawInfo = function() {
if (this.dataFilter) {
var canvas = this.frame.canvas;
var ctx = canvas.getContext('2d');
ctx.font = '14px arial'; // TODO: put in options
ctx.lineStyle = 'gray';
ctx.fillStyle = 'gray';
ctx.textAlign = 'left';
ctx.textBaseline = 'top';
var x = this.margin;
var y = this.margin;
ctx.fillText(this.dataFilter.getLabel() + ': ' + this.dataFilter.getSelectedValue(), x, y);
}
};
/**
* Redraw the axis
*/
Graph3d.prototype._redrawAxis = function() {
var canvas = this.frame.canvas,
ctx = canvas.getContext('2d'),
from, to, step, prettyStep,
text, xText, yText, zText,
offset, xOffset, yOffset,
xMin2d, xMax2d;
// TODO: get the actual rendered style of the containerElement
//ctx.font = this.containerElement.style.font;
ctx.font = 24 / this.camera.getArmLength() + 'px arial';
// calculate the length for the short grid lines
var gridLenX = 0.025 / this.scale.x;
var gridLenY = 0.025 / this.scale.y;
var textMargin = 5 / this.camera.getArmLength(); // px
var armAngle = this.camera.getArmRotation().horizontal;
// draw x-grid lines
ctx.lineWidth = 1;
prettyStep = (this.defaultXStep === undefined);
step = new StepNumber(this.xMin, this.xMax, this.xStep, prettyStep);
step.start();
if (step.getCurrent() < this.xMin) {
step.next();
}
while (!step.end()) {
var x = step.getCurrent();
if (this.showGrid) {
from = this._convert3Dto2D(new Point3d(x, this.yMin, this.zMin));
to = this._convert3Dto2D(new Point3d(x, this.yMax, this.zMin));
ctx.strokeStyle = this.gridColor;
ctx.beginPath();
ctx.moveTo(from.x, from.y);
ctx.lineTo(to.x, to.y);
ctx.stroke();
}
else {
from = this._convert3Dto2D(new Point3d(x, this.yMin, this.zMin));
to = this._convert3Dto2D(new Point3d(x, this.yMin+gridLenX, this.zMin));
ctx.strokeStyle = this.axisColor;
ctx.beginPath();
ctx.moveTo(from.x, from.y);
ctx.lineTo(to.x, to.y);
ctx.stroke();
from = this._convert3Dto2D(new Point3d(x, this.yMax, this.zMin));
to = this._convert3Dto2D(new Point3d(x, this.yMax-gridLenX, this.zMin));
ctx.strokeStyle = this.axisColor;
ctx.beginPath();
ctx.moveTo(from.x, from.y);
ctx.lineTo(to.x, to.y);
ctx.stroke();
}
yText = (Math.cos(armAngle) > 0) ? this.yMin : this.yMax;
text = this._convert3Dto2D(new Point3d(x, yText, this.zMin));
if (Math.cos(armAngle * 2) > 0) {
ctx.textAlign = 'center';
ctx.textBaseline = 'top';
text.y += textMargin;
}
else if (Math.sin(armAngle * 2) < 0){
ctx.textAlign = 'right';
ctx.textBaseline = 'middle';
}
else {
ctx.textAlign = 'left';
ctx.textBaseline = 'middle';
}
ctx.fillStyle = this.axisColor;
ctx.fillText(' ' + this.xValueLabel(step.getCurrent()) + ' ', text.x, text.y);
step.next();
}
// draw y-grid lines
ctx.lineWidth = 1;
prettyStep = (this.defaultYStep === undefined);
step = new StepNumber(this.yMin, this.yMax, this.yStep, prettyStep);
step.start();
if (step.getCurrent() < this.yMin) {
step.next();
}
while (!step.end()) {
if (this.showGrid) {
from = this._convert3Dto2D(new Point3d(this.xMin, step.getCurrent(), this.zMin));
to = this._convert3Dto2D(new Point3d(this.xMax, step.getCurrent(), this.zMin));
ctx.strokeStyle = this.gridColor;
ctx.beginPath();
ctx.moveTo(from.x, from.y);
ctx.lineTo(to.x, to.y);
ctx.stroke();
}
else {
from = this._convert3Dto2D(new Point3d(this.xMin, step.getCurrent(), this.zMin));
to = this._convert3Dto2D(new Point3d(this.xMin+gridLenY, step.getCurrent(), this.zMin));
ctx.strokeStyle = this.axisColor;
ctx.beginPath();
ctx.moveTo(from.x, from.y);
ctx.lineTo(to.x, to.y);
ctx.stroke();
from = this._convert3Dto2D(new Point3d(this.xMax, step.getCurrent(), this.zMin));
to = this._convert3Dto2D(new Point3d(this.xMax-gridLenY, step.getCurrent(), this.zMin));
ctx.strokeStyle = this.axisColor;
ctx.beginPath();
ctx.moveTo(from.x, from.y);
ctx.lineTo(to.x, to.y);
ctx.stroke();
}
xText = (Math.sin(armAngle ) > 0) ? this.xMin : this.xMax;
text = this._convert3Dto2D(new Point3d(xText, step.getCurrent(), this.zMin));
if (Math.cos(armAngle * 2) < 0) {
ctx.textAlign = 'center';
ctx.textBaseline = 'top';
text.y += textMargin;
}
else if (Math.sin(armAngle * 2) > 0){
ctx.textAlign = 'right';
ctx.textBaseline = 'middle';
}
else {
ctx.textAlign = 'left';
ctx.textBaseline = 'middle';
}
ctx.fillStyle = this.axisColor;
ctx.fillText(' ' + this.yValueLabel(step.getCurrent()) + ' ', text.x, text.y);
step.next();
}
// draw z-grid lines and axis
ctx.lineWidth = 1;
prettyStep = (this.defaultZStep === undefined);
step = new StepNumber(this.zMin, this.zMax, this.zStep, prettyStep);
step.start();
if (step.getCurrent() < this.zMin) {
step.next();
}
xText = (Math.cos(armAngle ) > 0) ? this.xMin : this.xMax;
yText = (Math.sin(armAngle ) < 0) ? this.yMin : this.yMax;
while (!step.end()) {
// TODO: make z-grid lines really 3d?
from = this._convert3Dto2D(new Point3d(xText, yText, step.getCurrent()));
ctx.strokeStyle = this.axisColor;
ctx.beginPath();
ctx.moveTo(from.x, from.y);
ctx.lineTo(from.x - textMargin, from.y);
ctx.stroke();
ctx.textAlign = 'right';
ctx.textBaseline = 'middle';
ctx.fillStyle = this.axisColor;
ctx.fillText(this.zValueLabel(step.getCurrent()) + ' ', from.x - 5, from.y);
step.next();
}
ctx.lineWidth = 1;
from = this._convert3Dto2D(new Point3d(xText, yText, this.zMin));
to = this._convert3Dto2D(new Point3d(xText, yText, this.zMax));
ctx.strokeStyle = this.axisColor;
ctx.beginPath();
ctx.moveTo(from.x, from.y);
ctx.lineTo(to.x, to.y);
ctx.stroke();
// draw x-axis
ctx.lineWidth = 1;
// line at yMin
xMin2d = this._convert3Dto2D(new Point3d(this.xMin, this.yMin, this.zMin));
xMax2d = this._convert3Dto2D(new Point3d(this.xMax, this.yMin, this.zMin));
ctx.strokeStyle = this.axisColor;
ctx.beginPath();
ctx.moveTo(xMin2d.x, xMin2d.y);
ctx.lineTo(xMax2d.x, xMax2d.y);
ctx.stroke();
// line at ymax
xMin2d = this._convert3Dto2D(new Point3d(this.xMin, this.yMax, this.zMin));
xMax2d = this._convert3Dto2D(new Point3d(this.xMax, this.yMax, this.zMin));
ctx.strokeStyle = this.axisColor;
ctx.beginPath();
ctx.moveTo(xMin2d.x, xMin2d.y);
ctx.lineTo(xMax2d.x, xMax2d.y);
ctx.stroke();
// draw y-axis
ctx.lineWidth = 1;
// line at xMin
from = this._convert3Dto2D(new Point3d(this.xMin, this.yMin, this.zMin));
to = this._convert3Dto2D(new Point3d(this.xMin, this.yMax, this.zMin));
ctx.strokeStyle = this.axisColor;
ctx.beginPath();
ctx.moveTo(from.x, from.y);
ctx.lineTo(to.x, to.y);
ctx.stroke();
// line at xMax
from = this._convert3Dto2D(new Point3d(this.xMax, this.yMin, this.zMin));
to = this._convert3Dto2D(new Point3d(this.xMax, this.yMax, this.zMin));
ctx.strokeStyle = this.axisColor;
ctx.beginPath();
ctx.moveTo(from.x, from.y);
ctx.lineTo(to.x, to.y);
ctx.stroke();
// draw x-label
var xLabel = this.xLabel;
if (xLabel.length > 0) {
yOffset = 0.1 / this.scale.y;
xText = (this.xMin + this.xMax) / 2;
yText = (Math.cos(armAngle) > 0) ? this.yMin - yOffset: this.yMax + yOffset;
text = this._convert3Dto2D(new Point3d(xText, yText, this.zMin));
if (Math.cos(armAngle * 2) > 0) {
ctx.textAlign = 'center';
ctx.textBaseline = 'top';
}
else if (Math.sin(armAngle * 2) < 0){
ctx.textAlign = 'right';
ctx.textBaseline = 'middle';
}
else {
ctx.textAlign = 'left';
ctx.textBaseline = 'middle';
}
ctx.fillStyle = this.axisColor;
ctx.fillText(xLabel, text.x, text.y);
}
// draw y-label
var yLabel = this.yLabel;
if (yLabel.length > 0) {
xOffset = 0.1 / this.scale.x;
xText = (Math.sin(armAngle ) > 0) ? this.xMin - xOffset : this.xMax + xOffset;
yText = (this.yMin + this.yMax) / 2;
text = this._convert3Dto2D(new Point3d(xText, yText, this.zMin));
if (Math.cos(armAngle * 2) < 0) {
ctx.textAlign = 'center';
ctx.textBaseline = 'top';
}
else if (Math.sin(armAngle * 2) > 0){
ctx.textAlign = 'right';
ctx.textBaseline = 'middle';
}
else {
ctx.textAlign = 'left';
ctx.textBaseline = 'middle';
}
ctx.fillStyle = this.axisColor;
ctx.fillText(yLabel, text.x, text.y);
}
// draw z-label
var zLabel = this.zLabel;
if (zLabel.length > 0) {
offset = 30; // pixels. // TODO: relate to the max width of the values on the z axis?
xText = (Math.cos(armAngle ) > 0) ? this.xMin : this.xMax;
yText = (Math.sin(armAngle ) < 0) ? this.yMin : this.yMax;
zText = (this.zMin + this.zMax) / 2;
text = this._convert3Dto2D(new Point3d(xText, yText, zText));
ctx.textAlign = 'right';
ctx.textBaseline = 'middle';
ctx.fillStyle = this.axisColor;
ctx.fillText(zLabel, text.x - offset, text.y);
}
};
/**
* Calculate the color based on the given value.
* @param {Number} H Hue, a value be between 0 and 360
* @param {Number} S Saturation, a value between 0 and 1
* @param {Number} V Value, a value between 0 and 1
*/
Graph3d.prototype._hsv2rgb = function(H, S, V) {
var R, G, B, C, Hi, X;
C = V * S;
Hi = Math.floor(H/60); // hi = 0,1,2,3,4,5
X = C * (1 - Math.abs(((H/60) % 2) - 1));
switch (Hi) {
case 0: R = C; G = X; B = 0; break;
case 1: R = X; G = C; B = 0; break;
case 2: R = 0; G = C; B = X; break;
case 3: R = 0; G = X; B = C; break;
case 4: R = X; G = 0; B = C; break;
case 5: R = C; G = 0; B = X; break;
default: R = 0; G = 0; B = 0; break;
}
return 'RGB(' + parseInt(R*255) + ',' + parseInt(G*255) + ',' + parseInt(B*255) + ')';
};
/**
* Draw all datapoints as a grid
* This function can be used when the style is 'grid'
*/
Graph3d.prototype._redrawDataGrid = function() {
var canvas = this.frame.canvas,
ctx = canvas.getContext('2d'),
point, right, top, cross,
i,
topSideVisible, fillStyle, strokeStyle, lineWidth,
h, s, v, zAvg;
ctx.lineJoin = 'round';
ctx.lineCap = 'round';
if (this.dataPoints === undefined || this.dataPoints.length <= 0)
return; // TODO: throw exception?
// calculate the translations and screen position of all points
for (i = 0; i < this.dataPoints.length; i++) {
var trans = this._convertPointToTranslation(this.dataPoints[i].point);
var screen = this._convertTranslationToScreen(trans);
this.dataPoints[i].trans = trans;
this.dataPoints[i].screen = screen;
// calculate the translation of the point at the bottom (needed for sorting)
var transBottom = this._convertPointToTranslation(this.dataPoints[i].bottom);
this.dataPoints[i].dist = this.showPerspective ? transBottom.length() : -transBottom.z;
}
// sort the points on depth of their (x,y) position (not on z)
var sortDepth = function (a, b) {
return b.dist - a.dist;
};
this.dataPoints.sort(sortDepth);
if (this.style === Graph3d.STYLE.SURFACE) {
for (i = 0; i < this.dataPoints.length; i++) {
point = this.dataPoints[i];
right = this.dataPoints[i].pointRight;
top = this.dataPoints[i].pointTop;
cross = this.dataPoints[i].pointCross;
if (point !== undefined && right !== undefined && top !== undefined && cross !== undefined) {
if (this.showGrayBottom || this.showShadow) {
// calculate the cross product of the two vectors from center
// to left and right, in order to know whether we are looking at the
// bottom or at the top side. We can also use the cross product
// for calculating light intensity
var aDiff = Point3d.subtract(cross.trans, point.trans);
var bDiff = Point3d.subtract(top.trans, right.trans);
var crossproduct = Point3d.crossProduct(aDiff, bDiff);
var len = crossproduct.length();
// FIXME: there is a bug with determining the surface side (shadow or colored)
topSideVisible = (crossproduct.z > 0);
}
else {
topSideVisible = true;
}
if (topSideVisible) {
// calculate Hue from the current value. At zMin the hue is 240, at zMax the hue is 0
zAvg = (point.point.z + right.point.z + top.point.z + cross.point.z) / 4;
h = (1 - (zAvg - this.zMin) * this.scale.z / this.verticalRatio) * 240;
s = 1; // saturation
if (this.showShadow) {
v = Math.min(1 + (crossproduct.x / len) / 2, 1); // value. TODO: scale
fillStyle = this._hsv2rgb(h, s, v);
strokeStyle = fillStyle;
}
else {
v = 1;
fillStyle = this._hsv2rgb(h, s, v);
strokeStyle = this.axisColor; // TODO: should be customizable
}
}
else {
fillStyle = 'gray';
strokeStyle = this.axisColor;
}
ctx.lineWidth = this._getStrokeWidth(point);
ctx.fillStyle = fillStyle;
ctx.strokeStyle = strokeStyle;
ctx.beginPath();
ctx.moveTo(point.screen.x, point.screen.y);
ctx.lineTo(right.screen.x, right.screen.y);
ctx.lineTo(cross.screen.x, cross.screen.y);
ctx.lineTo(top.screen.x, top.screen.y);
ctx.closePath();
ctx.fill();
ctx.stroke(); // TODO: only draw stroke when strokeWidth > 0
}
}
}
else { // grid style
for (i = 0; i < this.dataPoints.length; i++) {
point = this.dataPoints[i];
right = this.dataPoints[i].pointRight;
top = this.dataPoints[i].pointTop;
if (point !== undefined && right !== undefined) {
// calculate Hue from the current value. At zMin the hue is 240, at zMax the hue is 0
zAvg = (point.point.z + right.point.z) / 2;
h = (1 - (zAvg - this.zMin) * this.scale.z / this.verticalRatio) * 240;
ctx.lineWidth = this._getStrokeWidth(point) * 2;
ctx.strokeStyle = this._hsv2rgb(h, 1, 1);
ctx.beginPath();
ctx.moveTo(point.screen.x, point.screen.y);
ctx.lineTo(right.screen.x, right.screen.y);
ctx.stroke();
}
if (point !== undefined && top !== undefined) {
// calculate Hue from the current value. At zMin the hue is 240, at zMax the hue is 0
zAvg = (point.point.z + top.point.z) / 2;
h = (1 - (zAvg - this.zMin) * this.scale.z / this.verticalRatio) * 240;
ctx.lineWidth = this._getStrokeWidth(point) * 2;
ctx.strokeStyle = this._hsv2rgb(h, 1, 1);
ctx.beginPath();
ctx.moveTo(point.screen.x, point.screen.y);
ctx.lineTo(top.screen.x, top.screen.y);
ctx.stroke();
}
}
}
};
Graph3d.prototype._getStrokeWidth = function(point) {
if (point !== undefined) {
if (this.showPerspective) {
return 1 / -point.trans.z * this.dataColor.strokeWidth;
}
else {
return -(this.eye.z / this.camera.getArmLength()) * this.dataColor.strokeWidth;
}
}
return this.dataColor.strokeWidth;
};
/**
* Draw all datapoints as dots.
* This function can be used when the style is 'dot' or 'dot-line'
*/
Graph3d.prototype._redrawDataDot = function() {
var canvas = this.frame.canvas;
var ctx = canvas.getContext('2d');
var i;
if (this.dataPoints === undefined || this.dataPoints.length <= 0)
return; // TODO: throw exception?
// calculate the translations of all points
for (i = 0; i < this.dataPoints.length; i++) {
var trans = this._convertPointToTranslation(this.dataPoints[i].point);
var screen = this._convertTranslationToScreen(trans);
this.dataPoints[i].trans = trans;
this.dataPoints[i].screen = screen;
// calculate the distance from the point at the bottom to the camera
var transBottom = this._convertPointToTranslation(this.dataPoints[i].bottom);
this.dataPoints[i].dist = this.showPerspective ? transBottom.length() : -transBottom.z;
}
// order the translated points by depth
var sortDepth = function (a, b) {
return b.dist - a.dist;
};
this.dataPoints.sort(sortDepth);
// draw the datapoints as colored circles
var dotSize = this.frame.clientWidth * this.dotSizeRatio; // px
for (i = 0; i < this.dataPoints.length; i++) {
var point = this.dataPoints[i];
if (this.style === Graph3d.STYLE.DOTLINE) {
// draw a vertical line from the bottom to the graph value
//var from = this._convert3Dto2D(new Point3d(point.point.x, point.point.y, this.zMin));
var from = this._convert3Dto2D(point.bottom);
ctx.lineWidth = 1;
ctx.strokeStyle = this.gridColor;
ctx.beginPath();
ctx.moveTo(from.x, from.y);
ctx.lineTo(point.screen.x, point.screen.y);
ctx.stroke();
}
// calculate radius for the circle
var size;
if (this.style === Graph3d.STYLE.DOTSIZE) {
size = dotSize/2 + 2*dotSize * (point.point.value - this.valueMin) / (this.valueMax - this.valueMin);
}
else {
size = dotSize;
}
var radius;
if (this.showPerspective) {
radius = size / -point.trans.z;
}
else {
radius = size * -(this.eye.z / this.camera.getArmLength());
}
if (radius < 0) {
radius = 0;
}
var hue, color, borderColor;
if (this.style === Graph3d.STYLE.DOTCOLOR ) {
// calculate the color based on the value
hue = (1 - (point.point.value - this.valueMin) * this.scale.value) * 240;
color = this._hsv2rgb(hue, 1, 1);
borderColor = this._hsv2rgb(hue, 1, 0.8);
}
else if (this.style === Graph3d.STYLE.DOTSIZE) {
color = this.dataColor.fill;
borderColor = this.dataColor.stroke;
}
else {
// calculate Hue from the current value. At zMin the hue is 240, at zMax the hue is 0
hue = (1 - (point.point.z - this.zMin) * this.scale.z / this.verticalRatio) * 240;
color = this._hsv2rgb(hue, 1, 1);
borderColor = this._hsv2rgb(hue, 1, 0.8);
}
// draw the circle
ctx.lineWidth = this._getStrokeWidth(point);
ctx.strokeStyle = borderColor;
ctx.fillStyle = color;
ctx.beginPath();
ctx.arc(point.screen.x, point.screen.y, radius, 0, Math.PI*2, true);
ctx.fill();
ctx.stroke();
}
};
/**
* Draw all datapoints as bars.
* This function can be used when the style is 'bar', 'bar-color', or 'bar-size'
*/
Graph3d.prototype._redrawDataBar = function() {
var canvas = this.frame.canvas;
var ctx = canvas.getContext('2d');
var i, j, surface, corners;
if (this.dataPoints === undefined || this.dataPoints.length <= 0)
return; // TODO: throw exception?
// calculate the translations of all points
for (i = 0; i < this.dataPoints.length; i++) {
var trans = this._convertPointToTranslation(this.dataPoints[i].point);
var screen = this._convertTranslationToScreen(trans);
this.dataPoints[i].trans = trans;
this.dataPoints[i].screen = screen;
// calculate the distance from the point at the bottom to the camera
var transBottom = this._convertPointToTranslation(this.dataPoints[i].bottom);
this.dataPoints[i].dist = this.showPerspective ? transBottom.length() : -transBottom.z;
}
// order the translated points by depth
var sortDepth = function (a, b) {
return b.dist - a.dist;
};
this.dataPoints.sort(sortDepth);
ctx.lineJoin = 'round';
ctx.lineCap = 'round';
// draw the datapoints as bars
var xWidth = this.xBarWidth / 2;
var yWidth = this.yBarWidth / 2;
for (i = 0; i < this.dataPoints.length; i++) {
var point = this.dataPoints[i];
// determine color
var hue, color, borderColor;
if (this.style === Graph3d.STYLE.BARCOLOR ) {
// calculate the color based on the value
hue = (1 - (point.point.value - this.valueMin) * this.scale.value) * 240;
color = this._hsv2rgb(hue, 1, 1);
borderColor = this._hsv2rgb(hue, 1, 0.8);
}
else if (this.style === Graph3d.STYLE.BARSIZE) {
color = this.dataColor.fill;
borderColor = this.dataColor.stroke;
}
else {
// calculate Hue from the current value. At zMin the hue is 240, at zMax the hue is 0
hue = (1 - (point.point.z - this.zMin) * this.scale.z / this.verticalRatio) * 240;
color = this._hsv2rgb(hue, 1, 1);
borderColor = this._hsv2rgb(hue, 1, 0.8);
}
// calculate size for the bar
if (this.style === Graph3d.STYLE.BARSIZE) {
xWidth = (this.xBarWidth / 2) * ((point.point.value - this.valueMin) / (this.valueMax - this.valueMin) * 0.8 + 0.2);
yWidth = (this.yBarWidth / 2) * ((point.point.value - this.valueMin) / (this.valueMax - this.valueMin) * 0.8 + 0.2);
}
// calculate all corner points
var me = this;
var point3d = point.point;
var top = [
{point: new Point3d(point3d.x - xWidth, point3d.y - yWidth, point3d.z)},
{point: new Point3d(point3d.x + xWidth, point3d.y - yWidth, point3d.z)},
{point: new Point3d(point3d.x + xWidth, point3d.y + yWidth, point3d.z)},
{point: new Point3d(point3d.x - xWidth, point3d.y + yWidth, point3d.z)}
];
var bottom = [
{point: new Point3d(point3d.x - xWidth, point3d.y - yWidth, this.zMin)},
{point: new Point3d(point3d.x + xWidth, point3d.y - yWidth, this.zMin)},
{point: new Point3d(point3d.x + xWidth, point3d.y + yWidth, this.zMin)},
{point: new Point3d(point3d.x - xWidth, point3d.y + yWidth, this.zMin)}
];
// calculate screen location of the points
top.forEach(function (obj) {
obj.screen = me._convert3Dto2D(obj.point);
});
bottom.forEach(function (obj) {
obj.screen = me._convert3Dto2D(obj.point);
});
// create five sides, calculate both corner points and center points
var surfaces = [
{corners: top, center: Point3d.avg(bottom[0].point, bottom[2].point)},
{corners: [top[0], top[1], bottom[1], bottom[0]], center: Point3d.avg(bottom[1].point, bottom[0].point)},
{corners: [top[1], top[2], bottom[2], bottom[1]], center: Point3d.avg(bottom[2].point, bottom[1].point)},
{corners: [top[2], top[3], bottom[3], bottom[2]], center: Point3d.avg(bottom[3].point, bottom[2].point)},
{corners: [top[3], top[0], bottom[0], bottom[3]], center: Point3d.avg(bottom[0].point, bottom[3].point)}
];
point.surfaces = surfaces;
// calculate the distance of each of the surface centers to the camera
for (j = 0; j < surfaces.length; j++) {
surface = surfaces[j];
var transCenter = this._convertPointToTranslation(surface.center);
surface.dist = this.showPerspective ? transCenter.length() : -transCenter.z;
// TODO: this dept calculation doesn't work 100% of the cases due to perspective,
// but the current solution is fast/simple and works in 99.9% of all cases
// the issue is visible in example 14, with graph.setCameraPosition({horizontal: 2.97, vertical: 0.5, distance: 0.9})
}
// order the surfaces by their (translated) depth
surfaces.sort(function (a, b) {
var diff = b.dist - a.dist;
if (diff) return diff;
// if equal depth, sort the top surface last
if (a.corners === top) return 1;
if (b.corners === top) return -1;
// both are equal
return 0;
});
// draw the ordered surfaces
ctx.lineWidth = this._getStrokeWidth(point);
ctx.strokeStyle = borderColor;
ctx.fillStyle = color;
// NOTE: we start at j=2 instead of j=0 as we don't need to draw the two surfaces at the backside
for (j = 2; j < surfaces.length; j++) {
surface = surfaces[j];
corners = surface.corners;
ctx.beginPath();
ctx.moveTo(corners[3].screen.x, corners[3].screen.y);
ctx.lineTo(corners[0].screen.x, corners[0].screen.y);
ctx.lineTo(corners[1].screen.x, corners[1].screen.y);
ctx.lineTo(corners[2].screen.x, corners[2].screen.y);
ctx.lineTo(corners[3].screen.x, corners[3].screen.y);
ctx.fill();
ctx.stroke();
}
}
};
/**
* Draw a line through all datapoints.
* This function can be used when the style is 'line'
*/
Graph3d.prototype._redrawDataLine = function() {
var canvas = this.frame.canvas,
ctx = canvas.getContext('2d'),
point, i;
if (this.dataPoints === undefined || this.dataPoints.length <= 0)
return; // TODO: throw exception?
// calculate the translations of all points
for (i = 0; i < this.dataPoints.length; i++) {
var trans = this._convertPointToTranslation(this.dataPoints[i].point);
var screen = this._convertTranslationToScreen(trans);
this.dataPoints[i].trans = trans;
this.dataPoints[i].screen = screen;
}
// start the line
if (this.dataPoints.length > 0) {
point = this.dataPoints[0];
ctx.lineWidth = this._getStrokeWidth(point);
ctx.lineJoin = 'round';
ctx.lineCap = 'round';
ctx.strokeStyle = this.dataColor.stroke;
ctx.beginPath();
ctx.moveTo(point.screen.x, point.screen.y);
// draw the datapoints as colored circles
for (i = 1; i < this.dataPoints.length; i++) {
point = this.dataPoints[i];
ctx.lineTo(point.screen.x, point.screen.y);
}
// finish the line
ctx.stroke();
}
};
/**
* Start a moving operation inside the provided parent element
* @param {Event} event The event that occurred (required for
* retrieving the mouse position)
*/
Graph3d.prototype._onMouseDown = function(event) {
event = event || window.event;
// check if mouse is still down (may be up when focus is lost for example
// in an iframe)
if (this.leftButtonDown) {
this._onMouseUp(event);
}
// only react on left mouse button down
this.leftButtonDown = event.which ? (event.which === 1) : (event.button === 1);
if (!this.leftButtonDown && !this.touchDown) return;
// get mouse position (different code for IE and all other browsers)
this.startMouseX = getMouseX(event);
this.startMouseY = getMouseY(event);
this.startStart = new Date(this.start);
this.startEnd = new Date(this.end);
this.startArmRotation = this.camera.getArmRotation();
this.frame.style.cursor = 'move';
// add event listeners to handle moving the contents
// we store the function onmousemove and onmouseup in the graph, so we can
// remove the eventlisteners lateron in the function mouseUp()
var me = this;
this.onmousemove = function (event) {me._onMouseMove(event);};
this.onmouseup = function (event) {me._onMouseUp(event);};
util.addEventListener(document, 'mousemove', me.onmousemove);
util.addEventListener(document, 'mouseup', me.onmouseup);
util.preventDefault(event);
};
/**
* Perform moving operating.
* This function activated from within the funcion Graph.mouseDown().
* @param {Event} event Well, eehh, the event
*/
Graph3d.prototype._onMouseMove = function (event) {
event = event || window.event;
// calculate change in mouse position
var diffX = parseFloat(getMouseX(event)) - this.startMouseX;
var diffY = parseFloat(getMouseY(event)) - this.startMouseY;
var horizontalNew = this.startArmRotation.horizontal + diffX / 200;
var verticalNew = this.startArmRotation.vertical + diffY / 200;
var snapAngle = 4; // degrees
var snapValue = Math.sin(snapAngle / 360 * 2 * Math.PI);
// snap horizontally to nice angles at 0pi, 0.5pi, 1pi, 1.5pi, etc...
// the -0.001 is to take care that the vertical axis is always drawn at the left front corner
if (Math.abs(Math.sin(horizontalNew)) < snapValue) {
horizontalNew = Math.round((horizontalNew / Math.PI)) * Math.PI - 0.001;
}
if (Math.abs(Math.cos(horizontalNew)) < snapValue) {
horizontalNew = (Math.round((horizontalNew/ Math.PI - 0.5)) + 0.5) * Math.PI - 0.001;
}
// snap vertically to nice angles
if (Math.abs(Math.sin(verticalNew)) < snapValue) {
verticalNew = Math.round((verticalNew / Math.PI)) * Math.PI;
}
if (Math.abs(Math.cos(verticalNew)) < snapValue) {
verticalNew = (Math.round((verticalNew/ Math.PI - 0.5)) + 0.5) * Math.PI;
}
this.camera.setArmRotation(horizontalNew, verticalNew);
this.redraw();
// fire a cameraPositionChange event
var parameters = this.getCameraPosition();
this.emit('cameraPositionChange', parameters);
util.preventDefault(event);
};
/**
* Stop moving operating.
* This function activated from within the funcion Graph.mouseDown().
* @param {event} event The event
*/
Graph3d.prototype._onMouseUp = function (event) {
this.frame.style.cursor = 'auto';
this.leftButtonDown = false;
// remove event listeners here
util.removeEventListener(document, 'mousemove', this.onmousemove);
util.removeEventListener(document, 'mouseup', this.onmouseup);
util.preventDefault(event);
};
/**
* After having moved the mouse, a tooltip should pop up when the mouse is resting on a data point
* @param {Event} event A mouse move event
*/
Graph3d.prototype._onTooltip = function (event) {
var delay = 300; // ms
var boundingRect = this.frame.getBoundingClientRect();
var mouseX = getMouseX(event) - boundingRect.left;
var mouseY = getMouseY(event) - boundingRect.top;
if (!this.showTooltip) {
return;
}
if (this.tooltipTimeout) {
clearTimeout(this.tooltipTimeout);
}
// (delayed) display of a tooltip only if no mouse button is down
if (this.leftButtonDown) {
this._hideTooltip();
return;
}
if (this.tooltip && this.tooltip.dataPoint) {
// tooltip is currently visible
var dataPoint = this._dataPointFromXY(mouseX, mouseY);
if (dataPoint !== this.tooltip.dataPoint) {
// datapoint changed
if (dataPoint) {
this._showTooltip(dataPoint);
}
else {
this._hideTooltip();
}
}
}
else {
// tooltip is currently not visible
var me = this;
this.tooltipTimeout = setTimeout(function () {
me.tooltipTimeout = null;
// show a tooltip if we have a data point
var dataPoint = me._dataPointFromXY(mouseX, mouseY);
if (dataPoint) {
me._showTooltip(dataPoint);
}
}, delay);
}
};
/**
* Event handler for touchstart event on mobile devices
*/
Graph3d.prototype._onTouchStart = function(event) {
this.touchDown = true;
var me = this;
this.ontouchmove = function (event) {me._onTouchMove(event);};
this.ontouchend = function (event) {me._onTouchEnd(event);};
util.addEventListener(document, 'touchmove', me.ontouchmove);
util.addEventListener(document, 'touchend', me.ontouchend);
this._onMouseDown(event);
};
/**
* Event handler for touchmove event on mobile devices
*/
Graph3d.prototype._onTouchMove = function(event) {
this._onMouseMove(event);
};
/**
* Event handler for touchend event on mobile devices
*/
Graph3d.prototype._onTouchEnd = function(event) {
this.touchDown = false;
util.removeEventListener(document, 'touchmove', this.ontouchmove);
util.removeEventListener(document, 'touchend', this.ontouchend);
this._onMouseUp(event);
};
/**
* Event handler for mouse wheel event, used to zoom the graph
* Code from http://adomas.org/javascript-mouse-wheel/
* @param {event} event The event
*/
Graph3d.prototype._onWheel = function(event) {
if (!event) /* For IE. */
event = window.event;
// retrieve delta
var delta = 0;
if (event.wheelDelta) { /* IE/Opera. */
delta = event.wheelDelta/120;
} else if (event.detail) { /* Mozilla case. */
// In Mozilla, sign of delta is different than in IE.
// Also, delta is multiple of 3.
delta = -event.detail/3;
}
// If delta is nonzero, handle it.
// Basically, delta is now positive if wheel was scrolled up,
// and negative, if wheel was scrolled down.
if (delta) {
var oldLength = this.camera.getArmLength();
var newLength = oldLength * (1 - delta / 10);
this.camera.setArmLength(newLength);
this.redraw();
this._hideTooltip();
}
// fire a cameraPositionChange event
var parameters = this.getCameraPosition();
this.emit('cameraPositionChange', parameters);
// Prevent default actions caused by mouse wheel.
// That might be ugly, but we handle scrolls somehow
// anyway, so don't bother here..
util.preventDefault(event);
};
/**
* Test whether a point lies inside given 2D triangle
* @param {Point2d} point
* @param {Point2d[]} triangle
* @return {boolean} Returns true if given point lies inside or on the edge of the triangle
* @private
*/
Graph3d.prototype._insideTriangle = function (point, triangle) {
var a = triangle[0],
b = triangle[1],
c = triangle[2];
function sign (x) {
return x > 0 ? 1 : x < 0 ? -1 : 0;
}
var as = sign((b.x - a.x) * (point.y - a.y) - (b.y - a.y) * (point.x - a.x));
var bs = sign((c.x - b.x) * (point.y - b.y) - (c.y - b.y) * (point.x - b.x));
var cs = sign((a.x - c.x) * (point.y - c.y) - (a.y - c.y) * (point.x - c.x));
// each of the three signs must be either equal to each other or zero
return (as == 0 || bs == 0 || as == bs) &&
(bs == 0 || cs == 0 || bs == cs) &&
(as == 0 || cs == 0 || as == cs);
};
/**
* Find a data point close to given screen position (x, y)
* @param {Number} x
* @param {Number} y
* @return {Object | null} The closest data point or null if not close to any data point
* @private
*/
Graph3d.prototype._dataPointFromXY = function (x, y) {
var i,
distMax = 100, // px
dataPoint = null,
closestDataPoint = null,
closestDist = null,
center = new Point2d(x, y);
if (this.style === Graph3d.STYLE.BAR ||
this.style === Graph3d.STYLE.BARCOLOR ||
this.style === Graph3d.STYLE.BARSIZE) {
// the data points are ordered from far away to closest
for (i = this.dataPoints.length - 1; i >= 0; i--) {
dataPoint = this.dataPoints[i];
var surfaces = dataPoint.surfaces;
if (surfaces) {
for (var s = surfaces.length - 1; s >= 0; s--) {
// split each surface in two triangles, and see if the center point is inside one of these
var surface = surfaces[s];
var corners = surface.corners;
var triangle1 = [corners[0].screen, corners[1].screen, corners[2].screen];
var triangle2 = [corners[2].screen, corners[3].screen, corners[0].screen];
if (this._insideTriangle(center, triangle1) ||
this._insideTriangle(center, triangle2)) {
// return immediately at the first hit
return dataPoint;
}
}
}
}
}
else {
// find the closest data point, using distance to the center of the point on 2d screen
for (i = 0; i < this.dataPoints.length; i++) {
dataPoint = this.dataPoints[i];
var point = dataPoint.screen;
if (point) {
var distX = Math.abs(x - point.x);
var distY = Math.abs(y - point.y);
var dist = Math.sqrt(distX * distX + distY * distY);
if ((closestDist === null || dist < closestDist) && dist < distMax) {
closestDist = dist;
closestDataPoint = dataPoint;
}
}
}
}
return closestDataPoint;
};
/**
* Display a tooltip for given data point
* @param {Object} dataPoint
* @private
*/
Graph3d.prototype._showTooltip = function (dataPoint) {
var content, line, dot;
if (!this.tooltip) {
content = document.createElement('div');
content.style.position = 'absolute';
content.style.padding = '10px';
content.style.border = '1px solid #4d4d4d';
content.style.color = '#1a1a1a';
content.style.background = 'rgba(255,255,255,0.7)';
content.style.borderRadius = '2px';
content.style.boxShadow = '5px 5px 10px rgba(128,128,128,0.5)';
line = document.createElement('div');
line.style.position = 'absolute';
line.style.height = '40px';
line.style.width = '0';
line.style.borderLeft = '1px solid #4d4d4d';
dot = document.createElement('div');
dot.style.position = 'absolute';
dot.style.height = '0';
dot.style.width = '0';
dot.style.border = '5px solid #4d4d4d';
dot.style.borderRadius = '5px';
this.tooltip = {
dataPoint: null,
dom: {
content: content,
line: line,
dot: dot
}
};
}
else {
content = this.tooltip.dom.content;
line = this.tooltip.dom.line;
dot = this.tooltip.dom.dot;
}
this._hideTooltip();
this.tooltip.dataPoint = dataPoint;
if (typeof this.showTooltip === 'function') {
content.innerHTML = this.showTooltip(dataPoint.point);
}
else {
content.innerHTML = '<table>' +
'<tr><td>' + this.xLabel + ':</td><td>' + dataPoint.point.x + '</td></tr>' +
'<tr><td>' + this.yLabel + ':</td><td>' + dataPoint.point.y + '</td></tr>' +
'<tr><td>' + this.zLabel + ':</td><td>' + dataPoint.point.z + '</td></tr>' +
'</table>';
}
content.style.left = '0';
content.style.top = '0';
this.frame.appendChild(content);
this.frame.appendChild(line);
this.frame.appendChild(dot);
// calculate sizes
var contentWidth = content.offsetWidth;
var contentHeight = content.offsetHeight;
var lineHeight = line.offsetHeight;
var dotWidth = dot.offsetWidth;
var dotHeight = dot.offsetHeight;
var left = dataPoint.screen.x - contentWidth / 2;
left = Math.min(Math.max(left, 10), this.frame.clientWidth - 10 - contentWidth);
line.style.left = dataPoint.screen.x + 'px';
line.style.top = (dataPoint.screen.y - lineHeight) + 'px';
content.style.left = left + 'px';
content.style.top = (dataPoint.screen.y - lineHeight - contentHeight) + 'px';
dot.style.left = (dataPoint.screen.x - dotWidth / 2) + 'px';
dot.style.top = (dataPoint.screen.y - dotHeight / 2) + 'px';
};
/**
* Hide the tooltip when displayed
* @private
*/
Graph3d.prototype._hideTooltip = function () {
if (this.tooltip) {
this.tooltip.dataPoint = null;
for (var prop in this.tooltip.dom) {
if (this.tooltip.dom.hasOwnProperty(prop)) {
var elem = this.tooltip.dom[prop];
if (elem && elem.parentNode) {
elem.parentNode.removeChild(elem);
}
}
}
}
};
/**--------------------------------------------------------------------------**/
/**
* Get the horizontal mouse position from a mouse event
* @param {Event} event
* @return {Number} mouse x
*/
function getMouseX (event) {
if ('clientX' in event) return event.clientX;
return event.targetTouches[0] && event.targetTouches[0].clientX || 0;
}
/**
* Get the vertical mouse position from a mouse event
* @param {Event} event
* @return {Number} mouse y
*/
function getMouseY (event) {
if ('clientY' in event) return event.clientY;
return event.targetTouches[0] && event.targetTouches[0].clientY || 0;
}
module.exports = Graph3d;