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1063 lines
32 KiB
1063 lines
32 KiB
var util = require('../../util');
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var DOMutil = require('../../DOMutil');
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var DataSet = require('../../DataSet');
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var DataView = require('../../DataView');
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var Component = require('./Component');
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var DataAxis = require('./DataAxis');
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var GraphGroup = require('./GraphGroup');
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var Legend = require('./Legend');
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var UNGROUPED = '__ungrouped__'; // reserved group id for ungrouped items
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/**
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* This is the constructor of the LineGraph. It requires a Timeline body and options.
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*
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* @param body
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* @param options
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* @constructor
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*/
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function LineGraph(body, options) {
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this.id = util.randomUUID();
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this.body = body;
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this.defaultOptions = {
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yAxisOrientation: 'left',
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defaultGroup: 'default',
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sort: true,
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sampling: true,
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graphHeight: '400px',
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shaded: {
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enabled: false,
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orientation: 'bottom' // top, bottom
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},
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style: 'line', // line, bar
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barChart: {
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width: 50,
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align: 'center' // left, center, right
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},
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catmullRom: {
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enabled: true,
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parametrization: 'centripetal', // uniform (alpha = 0.0), chordal (alpha = 1.0), centripetal (alpha = 0.5)
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alpha: 0.5
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},
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drawPoints: {
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enabled: true,
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size: 6,
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style: 'square' // square, circle
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},
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dataAxis: {
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showMinorLabels: true,
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showMajorLabels: true,
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icons: false,
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width: '40px',
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visible: true
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},
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legend: {
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enabled: false,
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icons: true,
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left: {
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visible: true,
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position: 'top-left' // top/bottom - left,right
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},
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right: {
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visible: true,
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position: 'top-right' // top/bottom - left,right
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}
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}
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};
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// options is shared by this ItemSet and all its items
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this.options = util.extend({}, this.defaultOptions);
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this.dom = {};
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this.props = {};
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this.hammer = null;
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this.groups = {};
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var me = this;
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this.itemsData = null; // DataSet
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this.groupsData = null; // DataSet
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// listeners for the DataSet of the items
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this.itemListeners = {
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'add': function (event, params, senderId) {
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me._onAdd(params.items);
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},
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'update': function (event, params, senderId) {
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me._onUpdate(params.items);
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},
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'remove': function (event, params, senderId) {
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me._onRemove(params.items);
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}
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};
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// listeners for the DataSet of the groups
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this.groupListeners = {
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'add': function (event, params, senderId) {
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me._onAddGroups(params.items);
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},
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'update': function (event, params, senderId) {
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me._onUpdateGroups(params.items);
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},
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'remove': function (event, params, senderId) {
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me._onRemoveGroups(params.items);
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}
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};
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this.items = {}; // object with an Item for every data item
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this.selection = []; // list with the ids of all selected nodes
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this.lastStart = this.body.range.start;
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this.touchParams = {}; // stores properties while dragging
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this.svgElements = {};
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this.setOptions(options);
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this.groupsUsingDefaultStyles = [0];
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this.body.emitter.on("rangechange",function() {
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if (me.lastStart != 0) {
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var offset = me.body.range.start - me.lastStart;
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var range = me.body.range.end - me.body.range.start;
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if (me.width != 0) {
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var rangePerPixelInv = me.width/range;
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var xOffset = offset * rangePerPixelInv;
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me.svg.style.left = (-me.width - xOffset) + "px";
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}
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}
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});
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this.body.emitter.on("rangechanged", function() {
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me.lastStart = me.body.range.start;
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me.svg.style.left = util.option.asSize(-me.width);
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me._updateGraph.apply(me);
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});
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// create the HTML DOM
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this._create();
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this.body.emitter.emit("change");
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}
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LineGraph.prototype = new Component();
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/**
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* Create the HTML DOM for the ItemSet
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*/
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LineGraph.prototype._create = function(){
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var frame = document.createElement('div');
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frame.className = 'LineGraph';
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this.dom.frame = frame;
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// create svg element for graph drawing.
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this.svg = document.createElementNS('http://www.w3.org/2000/svg',"svg");
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this.svg.style.position = "relative";
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this.svg.style.height = ('' + this.options.graphHeight).replace("px",'') + 'px';
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this.svg.style.display = "block";
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frame.appendChild(this.svg);
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// data axis
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this.options.dataAxis.orientation = 'left';
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this.yAxisLeft = new DataAxis(this.body, this.options.dataAxis, this.svg);
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this.options.dataAxis.orientation = 'right';
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this.yAxisRight = new DataAxis(this.body, this.options.dataAxis, this.svg);
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delete this.options.dataAxis.orientation;
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// legends
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this.legendLeft = new Legend(this.body, this.options.legend, 'left');
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this.legendRight = new Legend(this.body, this.options.legend, 'right');
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this.show();
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};
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/**
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* set the options of the LineGraph. the mergeOptions is used for subObjects that have an enabled element.
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* @param options
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*/
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LineGraph.prototype.setOptions = function(options) {
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if (options) {
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var fields = ['sampling','defaultGroup','graphHeight','yAxisOrientation','style','barChart','dataAxis','sort'];
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util.selectiveDeepExtend(fields, this.options, options);
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util.mergeOptions(this.options, options,'catmullRom');
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util.mergeOptions(this.options, options,'drawPoints');
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util.mergeOptions(this.options, options,'shaded');
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util.mergeOptions(this.options, options,'legend');
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if (options.catmullRom) {
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if (typeof options.catmullRom == 'object') {
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if (options.catmullRom.parametrization) {
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if (options.catmullRom.parametrization == 'uniform') {
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this.options.catmullRom.alpha = 0;
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}
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else if (options.catmullRom.parametrization == 'chordal') {
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this.options.catmullRom.alpha = 1.0;
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}
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else {
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this.options.catmullRom.parametrization = 'centripetal';
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this.options.catmullRom.alpha = 0.5;
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}
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}
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}
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}
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if (this.yAxisLeft) {
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if (options.dataAxis !== undefined) {
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this.yAxisLeft.setOptions(this.options.dataAxis);
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this.yAxisRight.setOptions(this.options.dataAxis);
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}
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}
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if (this.legendLeft) {
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if (options.legend !== undefined) {
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this.legendLeft.setOptions(this.options.legend);
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this.legendRight.setOptions(this.options.legend);
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}
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}
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if (this.groups.hasOwnProperty(UNGROUPED)) {
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this.groups[UNGROUPED].setOptions(options);
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}
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}
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if (this.dom.frame) {
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this._updateGraph();
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}
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};
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/**
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* Hide the component from the DOM
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*/
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LineGraph.prototype.hide = function() {
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// remove the frame containing the items
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if (this.dom.frame.parentNode) {
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this.dom.frame.parentNode.removeChild(this.dom.frame);
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}
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};
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/**
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* Show the component in the DOM (when not already visible).
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* @return {Boolean} changed
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*/
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LineGraph.prototype.show = function() {
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// show frame containing the items
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if (!this.dom.frame.parentNode) {
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this.body.dom.center.appendChild(this.dom.frame);
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}
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};
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/**
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* Set items
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* @param {vis.DataSet | null} items
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*/
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LineGraph.prototype.setItems = function(items) {
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var me = this,
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ids,
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oldItemsData = this.itemsData;
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// replace the dataset
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if (!items) {
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this.itemsData = null;
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}
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else if (items instanceof DataSet || items instanceof DataView) {
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this.itemsData = items;
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}
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else {
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throw new TypeError('Data must be an instance of DataSet or DataView');
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}
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if (oldItemsData) {
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// unsubscribe from old dataset
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util.forEach(this.itemListeners, function (callback, event) {
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oldItemsData.off(event, callback);
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});
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// remove all drawn items
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ids = oldItemsData.getIds();
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this._onRemove(ids);
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}
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if (this.itemsData) {
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// subscribe to new dataset
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var id = this.id;
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util.forEach(this.itemListeners, function (callback, event) {
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me.itemsData.on(event, callback, id);
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});
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// add all new items
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ids = this.itemsData.getIds();
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this._onAdd(ids);
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}
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this._updateUngrouped();
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this._updateGraph();
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this.redraw();
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};
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/**
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* Set groups
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* @param {vis.DataSet} groups
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*/
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LineGraph.prototype.setGroups = function(groups) {
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var me = this,
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ids;
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// unsubscribe from current dataset
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if (this.groupsData) {
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util.forEach(this.groupListeners, function (callback, event) {
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me.groupsData.unsubscribe(event, callback);
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});
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// remove all drawn groups
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ids = this.groupsData.getIds();
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this.groupsData = null;
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this._onRemoveGroups(ids); // note: this will cause a redraw
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}
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// replace the dataset
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if (!groups) {
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this.groupsData = null;
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}
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else if (groups instanceof DataSet || groups instanceof DataView) {
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this.groupsData = groups;
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}
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else {
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throw new TypeError('Data must be an instance of DataSet or DataView');
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}
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if (this.groupsData) {
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// subscribe to new dataset
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var id = this.id;
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util.forEach(this.groupListeners, function (callback, event) {
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me.groupsData.on(event, callback, id);
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});
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// draw all ms
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ids = this.groupsData.getIds();
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this._onAddGroups(ids);
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}
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this._onUpdate();
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};
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LineGraph.prototype._onUpdate = function(ids) {
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this._updateUngrouped();
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this._updateAllGroupData();
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this._updateGraph();
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this.redraw();
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};
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LineGraph.prototype._onAdd = function (ids) {this._onUpdate(ids);};
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LineGraph.prototype._onRemove = function (ids) {this._onUpdate(ids);};
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LineGraph.prototype._onUpdateGroups = function (groupIds) {
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for (var i = 0; i < groupIds.length; i++) {
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var group = this.groupsData.get(groupIds[i]);
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this._updateGroup(group, groupIds[i]);
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}
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this._updateGraph();
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this.redraw();
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};
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LineGraph.prototype._onAddGroups = function (groupIds) {this._onUpdateGroups(groupIds);};
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LineGraph.prototype._onRemoveGroups = function (groupIds) {
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for (var i = 0; i < groupIds.length; i++) {
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if (!this.groups.hasOwnProperty(groupIds[i])) {
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if (this.groups[groupIds[i]].options.yAxisOrientation == 'right') {
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this.yAxisRight.removeGroup(groupIds[i]);
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this.legendRight.removeGroup(groupIds[i]);
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this.legendRight.redraw();
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}
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else {
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this.yAxisLeft.removeGroup(groupIds[i]);
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this.legendLeft.removeGroup(groupIds[i]);
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this.legendLeft.redraw();
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}
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delete this.groups[groupIds[i]];
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}
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}
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this._updateUngrouped();
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this._updateGraph();
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this.redraw();
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};
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/**
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* update a group object
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*
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* @param group
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* @param groupId
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* @private
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*/
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LineGraph.prototype._updateGroup = function (group, groupId) {
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if (!this.groups.hasOwnProperty(groupId)) {
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this.groups[groupId] = new GraphGroup(group, groupId, this.options, this.groupsUsingDefaultStyles);
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if (this.groups[groupId].options.yAxisOrientation == 'right') {
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this.yAxisRight.addGroup(groupId, this.groups[groupId]);
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this.legendRight.addGroup(groupId, this.groups[groupId]);
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}
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else {
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this.yAxisLeft.addGroup(groupId, this.groups[groupId]);
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this.legendLeft.addGroup(groupId, this.groups[groupId]);
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}
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}
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else {
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this.groups[groupId].update(group);
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if (this.groups[groupId].options.yAxisOrientation == 'right') {
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this.yAxisRight.updateGroup(groupId, this.groups[groupId]);
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this.legendRight.updateGroup(groupId, this.groups[groupId]);
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}
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else {
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this.yAxisLeft.updateGroup(groupId, this.groups[groupId]);
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this.legendLeft.updateGroup(groupId, this.groups[groupId]);
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}
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}
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this.legendLeft.redraw();
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this.legendRight.redraw();
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};
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LineGraph.prototype._updateAllGroupData = function () {
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if (this.itemsData != null) {
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var groupsContent = {};
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for (var groupId in this.groups) {
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if (this.groups.hasOwnProperty(groupId)) {
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groupsContent[groupId] = [];
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}
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}
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for (var itemId in this.itemsData._data) {
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if (this.itemsData._data.hasOwnProperty(itemId)) {
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var item = this.itemsData._data[itemId];
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item.x = util.convert(item.x,"Date");
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groupsContent[item.group].push(item);
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}
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}
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for (var groupId in this.groups) {
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if (this.groups.hasOwnProperty(groupId)) {
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this.groups[groupId].setItems(groupsContent[groupId]);
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}
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}
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}
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};
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/**
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* Create or delete the group holding all ungrouped items. This group is used when
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* there are no groups specified. This anonymous group is called 'graph'.
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* @protected
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*/
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LineGraph.prototype._updateUngrouped = function() {
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if (this.itemsData != null) {
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// var t0 = new Date();
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var group = {id: UNGROUPED, content: this.options.defaultGroup};
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this._updateGroup(group, UNGROUPED);
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var ungroupedCounter = 0;
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if (this.itemsData) {
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for (var itemId in this.itemsData._data) {
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if (this.itemsData._data.hasOwnProperty(itemId)) {
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var item = this.itemsData._data[itemId];
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if (item != undefined) {
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if (item.hasOwnProperty('group')) {
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if (item.group === undefined) {
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item.group = UNGROUPED;
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}
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}
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else {
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item.group = UNGROUPED;
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}
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ungroupedCounter = item.group == UNGROUPED ? ungroupedCounter + 1 : ungroupedCounter;
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}
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}
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}
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}
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// much much slower
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// var datapoints = this.itemsData.get({
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// filter: function (item) {return item.group === undefined;},
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// showInternalIds:true
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// });
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// if (datapoints.length > 0) {
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// var updateQuery = [];
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// for (var i = 0; i < datapoints.length; i++) {
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// updateQuery.push({id:datapoints[i].id, group: UNGROUPED});
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// }
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// this.itemsData.update(updateQuery, true);
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// }
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// var t1 = new Date();
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// var pointInUNGROUPED = this.itemsData.get({filter: function (item) {return item.group == UNGROUPED;}});
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if (ungroupedCounter == 0) {
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delete this.groups[UNGROUPED];
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this.legendLeft.removeGroup(UNGROUPED);
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this.legendRight.removeGroup(UNGROUPED);
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this.yAxisLeft.removeGroup(UNGROUPED);
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this.yAxisRight.removeGroup(UNGROUPED);
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}
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// console.log("getting amount ungrouped",new Date() - t1);
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// console.log("putting in ungrouped",new Date() - t0);
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}
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else {
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delete this.groups[UNGROUPED];
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this.legendLeft.removeGroup(UNGROUPED);
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this.legendRight.removeGroup(UNGROUPED);
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this.yAxisLeft.removeGroup(UNGROUPED);
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this.yAxisRight.removeGroup(UNGROUPED);
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}
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this.legendLeft.redraw();
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this.legendRight.redraw();
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};
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|
|
|
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/**
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* Redraw the component, mandatory function
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* @return {boolean} Returns true if the component is resized
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*/
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LineGraph.prototype.redraw = function() {
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var resized = false;
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this.svg.style.height = ('' + this.options.graphHeight).replace('px','') + 'px';
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if (this.lastWidth === undefined && this.width || this.lastWidth != this.width) {
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resized = true;
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}
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// check if this component is resized
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resized = this._isResized() || resized;
|
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// check whether zoomed (in that case we need to re-stack everything)
|
|
var visibleInterval = this.body.range.end - this.body.range.start;
|
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var zoomed = (visibleInterval != this.lastVisibleInterval) || (this.width != this.lastWidth);
|
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this.lastVisibleInterval = visibleInterval;
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this.lastWidth = this.width;
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|
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// calculate actual size and position
|
|
this.width = this.dom.frame.offsetWidth;
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|
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// the svg element is three times as big as the width, this allows for fully dragging left and right
|
|
// without reloading the graph. the controls for this are bound to events in the constructor
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|
if (resized == true) {
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this.svg.style.width = util.option.asSize(3*this.width);
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this.svg.style.left = util.option.asSize(-this.width);
|
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}
|
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if (zoomed == true) {
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this._updateGraph();
|
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}
|
|
|
|
this.legendLeft.redraw();
|
|
this.legendRight.redraw();
|
|
|
|
return resized;
|
|
};
|
|
|
|
/**
|
|
* Update and redraw the graph.
|
|
*
|
|
*/
|
|
LineGraph.prototype._updateGraph = function () {
|
|
// reset the svg elements
|
|
DOMutil.prepareElements(this.svgElements);
|
|
|
|
if (this.width != 0 && this.itemsData != null) {
|
|
var group, groupData, preprocessedGroup, i;
|
|
var preprocessedGroupData = [];
|
|
var processedGroupData = [];
|
|
var groupRanges = [];
|
|
var changeCalled = false;
|
|
|
|
// getting group Ids
|
|
var groupIds = [];
|
|
for (var groupId in this.groups) {
|
|
if (this.groups.hasOwnProperty(groupId)) {
|
|
groupIds.push(groupId);
|
|
}
|
|
}
|
|
|
|
// this is the range of the SVG canvas
|
|
var minDate = this.body.util.toGlobalTime(- this.body.domProps.root.width);
|
|
var maxDate = this.body.util.toGlobalTime(2 * this.body.domProps.root.width);
|
|
|
|
// first select and preprocess the data from the datasets.
|
|
// the groups have their preselection of data, we now loop over this data to see
|
|
// what data we need to draw. Sorted data is much faster.
|
|
// more optimization is possible by doing the sampling before and using the binary search
|
|
// to find the end date to determine the increment.
|
|
if (groupIds.length > 0) {
|
|
for (i = 0; i < groupIds.length; i++) {
|
|
group = this.groups[groupIds[i]];
|
|
if (group.visible == true) {
|
|
groupData = [];
|
|
// optimization for sorted data
|
|
if (group.options.sort == true) {
|
|
var guess = Math.max(0,util.binarySearchGeneric(group.itemsData, minDate, 'x', 'before'));
|
|
|
|
for (var j = guess; j < group.itemsData.length; j++) {
|
|
var item = group.itemsData[j];
|
|
if (item !== undefined) {
|
|
if (item.x > maxDate) {
|
|
groupData.push(item);
|
|
break;
|
|
}
|
|
else {
|
|
groupData.push(item);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
for (var j = 0; j < group.itemsData.length; j++) {
|
|
var item = group.itemsData[j];
|
|
if (item !== undefined) {
|
|
if (item.x > minDate && item.x < maxDate) {
|
|
groupData.push(item);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// preprocess, split into ranges and data
|
|
preprocessedGroup = this._preprocessData(groupData, group);
|
|
groupRanges.push({min: preprocessedGroup.min, max: preprocessedGroup.max});
|
|
preprocessedGroupData.push(preprocessedGroup.data);
|
|
}
|
|
else {
|
|
groupRanges.push({});
|
|
preprocessedGroupData.push([]);
|
|
}
|
|
}
|
|
|
|
// update the Y axis first, we use this data to draw at the correct Y points
|
|
// changeCalled is required to clean the SVG on a change emit.
|
|
changeCalled = this._updateYAxis(groupIds, groupRanges);
|
|
if (changeCalled == true) {
|
|
DOMutil.cleanupElements(this.svgElements);
|
|
this.body.emitter.emit("change");
|
|
return;
|
|
}
|
|
|
|
// with the yAxis scaled correctly, use this to get the Y values of the points.
|
|
for (i = 0; i < groupIds.length; i++) {
|
|
group = this.groups[groupIds[i]];
|
|
processedGroupData.push(this._convertYvalues(preprocessedGroupData[i],group))
|
|
}
|
|
|
|
// draw the groups
|
|
for (i = 0; i < groupIds.length; i++) {
|
|
group = this.groups[groupIds[i]];
|
|
if (group.visible == true) {
|
|
if (group.options.style == 'line') {
|
|
this._drawLineGraph(processedGroupData[i], group);
|
|
}
|
|
else {
|
|
this._drawBarGraph (processedGroupData[i], group);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// cleanup unused svg elements
|
|
DOMutil.cleanupElements(this.svgElements);
|
|
};
|
|
|
|
/**
|
|
* this sets the Y ranges for the Y axis. It also determines which of the axis should be shown or hidden.
|
|
* @param {array} groupIds
|
|
* @private
|
|
*/
|
|
LineGraph.prototype._updateYAxis = function (groupIds, groupRanges) {
|
|
var changeCalled = false;
|
|
var yAxisLeftUsed = false;
|
|
var yAxisRightUsed = false;
|
|
var minLeft = 1e9, minRight = 1e9, maxLeft = -1e9, maxRight = -1e9, minVal, maxVal;
|
|
var orientation = 'left';
|
|
|
|
// if groups are present
|
|
if (groupIds.length > 0) {
|
|
for (var i = 0; i < groupIds.length; i++) {
|
|
orientation = 'left';
|
|
var group = this.groups[groupIds[i]];
|
|
if (group.visible == true) {
|
|
if (group.options.yAxisOrientation == 'right') {
|
|
orientation = 'right';
|
|
}
|
|
|
|
minVal = groupRanges[i].min;
|
|
maxVal = groupRanges[i].max;
|
|
|
|
if (orientation == 'left') {
|
|
yAxisLeftUsed = true;
|
|
minLeft = minLeft > minVal ? minVal : minLeft;
|
|
maxLeft = maxLeft < maxVal ? maxVal : maxLeft;
|
|
}
|
|
else {
|
|
yAxisRightUsed = true;
|
|
minRight = minRight > minVal ? minVal : minRight;
|
|
maxRight = maxRight < maxVal ? maxVal : maxRight;
|
|
}
|
|
}
|
|
}
|
|
console.log(yAxisRightUsed)
|
|
if (yAxisLeftUsed == true) {
|
|
this.yAxisLeft.setRange(minLeft, maxLeft);
|
|
}
|
|
if (yAxisRightUsed == true) {
|
|
this.yAxisRight.setRange(minRight, maxRight);
|
|
}
|
|
}
|
|
|
|
changeCalled = this._toggleAxisVisiblity(yAxisLeftUsed , this.yAxisLeft) || changeCalled;
|
|
changeCalled = this._toggleAxisVisiblity(yAxisRightUsed, this.yAxisRight) || changeCalled;
|
|
|
|
if (yAxisRightUsed == true && yAxisLeftUsed == true) {
|
|
this.yAxisLeft.drawIcons = true;
|
|
this.yAxisRight.drawIcons = true;
|
|
}
|
|
else {
|
|
this.yAxisLeft.drawIcons = false;
|
|
this.yAxisRight.drawIcons = false;
|
|
}
|
|
|
|
this.yAxisRight.master = !yAxisLeftUsed;
|
|
|
|
if (this.yAxisRight.master == false) {
|
|
if (yAxisRightUsed == true) {this.yAxisLeft.lineOffset = this.yAxisRight.width;}
|
|
else {this.yAxisLeft.lineOffset = 0;}
|
|
|
|
changeCalled = this.yAxisLeft.redraw() || changeCalled;
|
|
this.yAxisRight.stepPixelsForced = this.yAxisLeft.stepPixels;
|
|
changeCalled = this.yAxisRight.redraw() || changeCalled;
|
|
}
|
|
else {
|
|
changeCalled = this.yAxisRight.redraw() || changeCalled;
|
|
}
|
|
return changeCalled;
|
|
};
|
|
|
|
/**
|
|
* This shows or hides the Y axis if needed. If there is a change, the changed event is emitted by the updateYAxis function
|
|
*
|
|
* @param {boolean} axisUsed
|
|
* @returns {boolean}
|
|
* @private
|
|
* @param axis
|
|
*/
|
|
LineGraph.prototype._toggleAxisVisiblity = function (axisUsed, axis) {
|
|
var changed = false;
|
|
if (axisUsed == false) {
|
|
if (axis.dom.frame.parentNode) {
|
|
axis.hide();
|
|
changed = true;
|
|
}
|
|
}
|
|
else {
|
|
if (!axis.dom.frame.parentNode) {
|
|
axis.show();
|
|
changed = true;
|
|
}
|
|
}
|
|
return changed;
|
|
};
|
|
|
|
|
|
/**
|
|
* draw a bar graph
|
|
* @param datapoints
|
|
* @param group
|
|
*/
|
|
LineGraph.prototype._drawBarGraph = function (dataset, group) {
|
|
if (dataset != null) {
|
|
if (dataset.length > 0) {
|
|
var coreDistance;
|
|
var minWidth = 0.1 * group.options.barChart.width;
|
|
var offset = 0;
|
|
var width = group.options.barChart.width;
|
|
|
|
if (group.options.barChart.align == 'left') {offset -= 0.5*width;}
|
|
else if (group.options.barChart.align == 'right') {offset += 0.5*width;}
|
|
|
|
for (var i = 0; i < dataset.length; i++) {
|
|
// dynammically downscale the width so there is no overlap up to 1/10th the original width
|
|
if (i+1 < dataset.length) {coreDistance = Math.abs(dataset[i+1].x - dataset[i].x);}
|
|
if (i > 0) {coreDistance = Math.min(coreDistance,Math.abs(dataset[i-1].x - dataset[i].x));}
|
|
if (coreDistance < width) {width = coreDistance < minWidth ? minWidth : coreDistance;}
|
|
|
|
DOMutil.drawBar(dataset[i].x + offset, dataset[i].y, width, group.zeroPosition - dataset[i].y, group.className + ' bar', this.svgElements, this.svg);
|
|
}
|
|
|
|
// draw points
|
|
if (group.options.drawPoints.enabled == true) {
|
|
this._drawPoints(dataset, group, this.svgElements, this.svg, offset);
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* draw a line graph
|
|
*
|
|
* @param datapoints
|
|
* @param group
|
|
*/
|
|
LineGraph.prototype._drawLineGraph = function (dataset, group) {
|
|
if (dataset != null) {
|
|
if (dataset.length > 0) {
|
|
var path, d;
|
|
var svgHeight = Number(this.svg.style.height.replace("px",""));
|
|
path = DOMutil.getSVGElement('path', this.svgElements, this.svg);
|
|
path.setAttributeNS(null, "class", group.className);
|
|
|
|
// construct path from dataset
|
|
if (group.options.catmullRom.enabled == true) {
|
|
d = this._catmullRom(dataset, group);
|
|
}
|
|
else {
|
|
d = this._linear(dataset);
|
|
}
|
|
|
|
// append with points for fill and finalize the path
|
|
if (group.options.shaded.enabled == true) {
|
|
var fillPath = DOMutil.getSVGElement('path',this.svgElements, this.svg);
|
|
var dFill;
|
|
if (group.options.shaded.orientation == 'top') {
|
|
dFill = "M" + dataset[0].x + "," + 0 + " " + d + "L" + dataset[dataset.length - 1].x + "," + 0;
|
|
}
|
|
else {
|
|
dFill = "M" + dataset[0].x + "," + svgHeight + " " + d + "L" + dataset[dataset.length - 1].x + "," + svgHeight;
|
|
}
|
|
fillPath.setAttributeNS(null, "class", group.className + " fill");
|
|
fillPath.setAttributeNS(null, "d", dFill);
|
|
}
|
|
// copy properties to path for drawing.
|
|
path.setAttributeNS(null, "d", "M" + d);
|
|
|
|
// draw points
|
|
if (group.options.drawPoints.enabled == true) {
|
|
this._drawPoints(dataset, group, this.svgElements, this.svg);
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* draw the data points
|
|
*
|
|
* @param dataset
|
|
* @param JSONcontainer
|
|
* @param svg
|
|
* @param group
|
|
*/
|
|
LineGraph.prototype._drawPoints = function (dataset, group, JSONcontainer, svg, offset) {
|
|
if (offset === undefined) {offset = 0;}
|
|
for (var i = 0; i < dataset.length; i++) {
|
|
DOMutil.drawPoint(dataset[i].x + offset, dataset[i].y, group, JSONcontainer, svg);
|
|
}
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
* This uses the DataAxis object to generate the correct X coordinate on the SVG window. It uses the
|
|
* util function toScreen to get the x coordinate from the timestamp. It also pre-filters the data and get the minMax ranges for
|
|
* the yAxis.
|
|
*
|
|
* @param datapoints
|
|
* @returns {Array}
|
|
* @private
|
|
*/
|
|
LineGraph.prototype._preprocessData = function (datapoints, group) {
|
|
var extractedData = [];
|
|
var xValue, yValue;
|
|
var toScreen = this.body.util.toScreen;
|
|
|
|
var increment = 1;
|
|
var amountOfPoints = datapoints.length;
|
|
|
|
var yMin = datapoints[0].y;
|
|
var yMax = datapoints[0].y;
|
|
|
|
// the global screen is used because changing the width of the yAxis may affect the increment, resulting in an endless loop
|
|
// of width changing of the yAxis.
|
|
if (group.options.sampling == true) {
|
|
var xDistance = this.body.util.toGlobalScreen(datapoints[datapoints.length-1].x) - this.body.util.toGlobalScreen(datapoints[0].x);
|
|
var pointsPerPixel = amountOfPoints/xDistance;
|
|
increment = Math.min(Math.ceil(0.2 * amountOfPoints), Math.max(1,Math.round(pointsPerPixel)));
|
|
}
|
|
|
|
for (var i = 0; i < amountOfPoints; i += increment) {
|
|
xValue = toScreen(datapoints[i].x) + this.width - 1;
|
|
yValue = datapoints[i].y;
|
|
extractedData.push({x: xValue, y: yValue});
|
|
yMin = yMin > yValue ? yValue : yMin;
|
|
yMax = yMax < yValue ? yValue : yMax;
|
|
}
|
|
|
|
// extractedData.sort(function (a,b) {return a.x - b.x;});
|
|
return {min: yMin, max: yMax, data: extractedData};
|
|
};
|
|
|
|
/**
|
|
* This uses the DataAxis object to generate the correct Y coordinate on the SVG window. It uses the
|
|
* util function toScreen to get the x coordinate from the timestamp.
|
|
*
|
|
* @param datapoints
|
|
* @param options
|
|
* @returns {Array}
|
|
* @private
|
|
*/
|
|
LineGraph.prototype._convertYvalues = function (datapoints, group) {
|
|
var extractedData = [];
|
|
var xValue, yValue;
|
|
var axis = this.yAxisLeft;
|
|
var svgHeight = Number(this.svg.style.height.replace("px",""));
|
|
|
|
if (group.options.yAxisOrientation == 'right') {
|
|
axis = this.yAxisRight;
|
|
}
|
|
|
|
for (var i = 0; i < datapoints.length; i++) {
|
|
xValue = datapoints[i].x;
|
|
yValue = Math.round(axis.convertValue(datapoints[i].y));
|
|
extractedData.push({x: xValue, y: yValue});
|
|
}
|
|
|
|
group.setZeroPosition(Math.min(svgHeight, axis.convertValue(0)));
|
|
|
|
// extractedData.sort(function (a,b) {return a.x - b.x;});
|
|
return extractedData;
|
|
};
|
|
|
|
|
|
/**
|
|
* This uses an uniform parametrization of the CatmullRom algorithm:
|
|
* "On the Parameterization of Catmull-Rom Curves" by Cem Yuksel et al.
|
|
* @param data
|
|
* @returns {string}
|
|
* @private
|
|
*/
|
|
LineGraph.prototype._catmullRomUniform = function(data) {
|
|
// catmull rom
|
|
var p0, p1, p2, p3, bp1, bp2;
|
|
var d = Math.round(data[0].x) + "," + Math.round(data[0].y) + " ";
|
|
var normalization = 1/6;
|
|
var length = data.length;
|
|
for (var i = 0; i < length - 1; i++) {
|
|
|
|
p0 = (i == 0) ? data[0] : data[i-1];
|
|
p1 = data[i];
|
|
p2 = data[i+1];
|
|
p3 = (i + 2 < length) ? data[i+2] : p2;
|
|
|
|
|
|
// Catmull-Rom to Cubic Bezier conversion matrix
|
|
// 0 1 0 0
|
|
// -1/6 1 1/6 0
|
|
// 0 1/6 1 -1/6
|
|
// 0 0 1 0
|
|
|
|
// bp0 = { x: p1.x, y: p1.y };
|
|
bp1 = { x: ((-p0.x + 6*p1.x + p2.x) *normalization), y: ((-p0.y + 6*p1.y + p2.y) *normalization)};
|
|
bp2 = { x: (( p1.x + 6*p2.x - p3.x) *normalization), y: (( p1.y + 6*p2.y - p3.y) *normalization)};
|
|
// bp0 = { x: p2.x, y: p2.y };
|
|
|
|
d += "C" +
|
|
bp1.x + "," +
|
|
bp1.y + " " +
|
|
bp2.x + "," +
|
|
bp2.y + " " +
|
|
p2.x + "," +
|
|
p2.y + " ";
|
|
}
|
|
|
|
return d;
|
|
};
|
|
|
|
/**
|
|
* This uses either the chordal or centripetal parameterization of the catmull-rom algorithm.
|
|
* By default, the centripetal parameterization is used because this gives the nicest results.
|
|
* These parameterizations are relatively heavy because the distance between 4 points have to be calculated.
|
|
*
|
|
* One optimization can be used to reuse distances since this is a sliding window approach.
|
|
* @param data
|
|
* @returns {string}
|
|
* @private
|
|
*/
|
|
LineGraph.prototype._catmullRom = function(data, group) {
|
|
var alpha = group.options.catmullRom.alpha;
|
|
if (alpha == 0 || alpha === undefined) {
|
|
return this._catmullRomUniform(data);
|
|
}
|
|
else {
|
|
var p0, p1, p2, p3, bp1, bp2, d1,d2,d3, A, B, N, M;
|
|
var d3powA, d2powA, d3pow2A, d2pow2A, d1pow2A, d1powA;
|
|
var d = Math.round(data[0].x) + "," + Math.round(data[0].y) + " ";
|
|
var length = data.length;
|
|
for (var i = 0; i < length - 1; i++) {
|
|
|
|
p0 = (i == 0) ? data[0] : data[i-1];
|
|
p1 = data[i];
|
|
p2 = data[i+1];
|
|
p3 = (i + 2 < length) ? data[i+2] : p2;
|
|
|
|
d1 = Math.sqrt(Math.pow(p0.x - p1.x,2) + Math.pow(p0.y - p1.y,2));
|
|
d2 = Math.sqrt(Math.pow(p1.x - p2.x,2) + Math.pow(p1.y - p2.y,2));
|
|
d3 = Math.sqrt(Math.pow(p2.x - p3.x,2) + Math.pow(p2.y - p3.y,2));
|
|
|
|
// Catmull-Rom to Cubic Bezier conversion matrix
|
|
//
|
|
// A = 2d1^2a + 3d1^a * d2^a + d3^2a
|
|
// B = 2d3^2a + 3d3^a * d2^a + d2^2a
|
|
//
|
|
// [ 0 1 0 0 ]
|
|
// [ -d2^2a/N A/N d1^2a/N 0 ]
|
|
// [ 0 d3^2a/M B/M -d2^2a/M ]
|
|
// [ 0 0 1 0 ]
|
|
|
|
// [ 0 1 0 0 ]
|
|
// [ -d2pow2a/N A/N d1pow2a/N 0 ]
|
|
// [ 0 d3pow2a/M B/M -d2pow2a/M ]
|
|
// [ 0 0 1 0 ]
|
|
|
|
d3powA = Math.pow(d3, alpha);
|
|
d3pow2A = Math.pow(d3,2*alpha);
|
|
d2powA = Math.pow(d2, alpha);
|
|
d2pow2A = Math.pow(d2,2*alpha);
|
|
d1powA = Math.pow(d1, alpha);
|
|
d1pow2A = Math.pow(d1,2*alpha);
|
|
|
|
A = 2*d1pow2A + 3*d1powA * d2powA + d2pow2A;
|
|
B = 2*d3pow2A + 3*d3powA * d2powA + d2pow2A;
|
|
N = 3*d1powA * (d1powA + d2powA);
|
|
if (N > 0) {N = 1 / N;}
|
|
M = 3*d3powA * (d3powA + d2powA);
|
|
if (M > 0) {M = 1 / M;}
|
|
|
|
bp1 = { x: ((-d2pow2A * p0.x + A*p1.x + d1pow2A * p2.x) * N),
|
|
y: ((-d2pow2A * p0.y + A*p1.y + d1pow2A * p2.y) * N)};
|
|
|
|
bp2 = { x: (( d3pow2A * p1.x + B*p2.x - d2pow2A * p3.x) * M),
|
|
y: (( d3pow2A * p1.y + B*p2.y - d2pow2A * p3.y) * M)};
|
|
|
|
if (bp1.x == 0 && bp1.y == 0) {bp1 = p1;}
|
|
if (bp2.x == 0 && bp2.y == 0) {bp2 = p2;}
|
|
d += "C" +
|
|
bp1.x + "," +
|
|
bp1.y + " " +
|
|
bp2.x + "," +
|
|
bp2.y + " " +
|
|
p2.x + "," +
|
|
p2.y + " ";
|
|
}
|
|
|
|
return d;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* this generates the SVG path for a linear drawing between datapoints.
|
|
* @param data
|
|
* @returns {string}
|
|
* @private
|
|
*/
|
|
LineGraph.prototype._linear = function(data) {
|
|
// linear
|
|
var d = "";
|
|
for (var i = 0; i < data.length; i++) {
|
|
if (i == 0) {
|
|
d += data[i].x + "," + data[i].y;
|
|
}
|
|
else {
|
|
d += " " + data[i].x + "," + data[i].y;
|
|
}
|
|
}
|
|
return d;
|
|
};
|
|
|
|
module.exports = LineGraph;
|