vis.js is a dynamic, browser-based visualization library
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var util = require('../../../util');
import Label from './shared/Label'
import BezierEdgeDynamic from './edges/BezierEdgeDynamic'
import BezierEdgeStatic from './edges/BezierEdgeStatic'
import StraightEdge from './edges/StraightEdge'
/**
* @class Edge
*
* A edge connects two nodes
* @param {Object} properties Object with options. Must contain
* At least options from and to.
* Available options: from (number),
* to (number), label (string, color (string),
* width (number), style (string),
* length (number), title (string)
* @param {Network} network A Network object, used to find and edge to
* nodes.
* @param {Object} constants An object with default values for
* example for the color
*/
class Edge {
constructor(options, body, globalOptions) {
if (body === undefined) {
throw "No body provided";
}
this.options = util.bridgeObject(globalOptions);
this.body = body;
// initialize variables
this.id = undefined;
this.fromId = undefined;
this.toId = undefined;
this.selected = false;
this.hover = false;
this.labelDirty = true;
this.colorDirty = true;
this.baseWidth = this.options.width;
this.baseFontSize = this.options.font.size;
this.from = undefined; // a node
this.to = undefined; // a node
this.edgeType = undefined;
this.connected = false;
this.labelModule = new Label(this.body, this.options);
this.setOptions(options);
}
/**
* Set or overwrite options for the edge
* @param {Object} options an object with options
* @param doNotEmit
*/
setOptions(options) {
if (!options) {
return;
}
this.colorDirty = true;
Edge.parseOptions(this.options, options);
if (options.id !== undefined) {this.id = options.id;}
if (options.from !== undefined) {this.fromId = options.from;}
if (options.to !== undefined) {this.toId = options.to;}
if (options.title !== undefined) {this.title = options.title;}
// A node is connected when it has a from and to node that both exist in the network.body.nodes.
this.connect();
// update label Module
this.updateLabelModule();
let dataChanged = this.updateEdgeType();
return dataChanged;
}
static parseOptions(parentOptions, newOptions) {
var fields = [
'id',
'font',
'from',
'hidden',
'hoverWidth',
'label',
'length',
'line',
'opacity',
'physics',
'selfReferenceSize',
'to',
'title',
'value',
'width',
'widthMin',
'widthMax',
'widthSelectionMultiplier'
];
// only deep extend the items in the field array. These do not have shorthand.
util.selectiveDeepExtend(fields, parentOptions, newOptions);
util.mergeOptions(parentOptions, newOptions, 'smooth');
util.mergeOptions(parentOptions, newOptions, 'dashes');
// set the scaling newOptions
if (newOptions.scaling !== undefined) {
if (newOptions.scaling.min !== undefined) {parentOptions.scaling.min = newOptions.scaling.min;}
if (newOptions.scaling.max !== undefined) {parentOptions.scaling.max = newOptions.scaling.max;}
util.mergeOptions(parentOptions.scaling, newOptions.scaling, 'label');
}
// hanlde multiple input cases for arrows
if (newOptions.arrows !== undefined) {
if (typeof newOptions.arrows === 'string') {
let arrows = newOptions.arrows.toLowerCase();
if (arrows.indexOf("to") != -1) {parentOptions.arrows.to.enabled = true;}
if (arrows.indexOf("middle") != -1) {parentOptions.arrows.middle.enabled = true;}
if (arrows.indexOf("from") != -1) {parentOptions.arrows.from.enabled = true;}
}
else if (typeof newOptions.arrows === 'object') {
util.mergeOptions(parentOptions.arrows, newOptions.arrows, 'to');
util.mergeOptions(parentOptions.arrows, newOptions.arrows, 'middle');
util.mergeOptions(parentOptions.arrows, newOptions.arrows, 'from');
}
else {
throw new Error("The arrow newOptions can only be an object or a string. Refer to the documentation. You used:" + JSON.stringify(newOptions.arrows));
}
}
// hanlde multiple input cases for color
if (newOptions.color !== undefined) {
if (util.isString(newOptions.color)) {
parentOptions.color.color = newOptions.color;
parentOptions.color.highlight = newOptions.color;
parentOptions.color.hover = newOptions.color;
parentOptions.color.inherit.enabled = false;
}
else {
let colorsDefined = false;
if (newOptions.color.color !== undefined) {parentOptions.color.color = newOptions.color.color; colorsDefined = true;}
if (newOptions.color.highlight !== undefined) {parentOptions.color.highlight = newOptions.color.highlight; colorsDefined = true;}
if (newOptions.color.hover !== undefined) {parentOptions.color.hover = newOptions.color.hover; colorsDefined = true;}
if (newOptions.color.opacity !== undefined) {parentOptions.color.opacity = newOptions.color.opacity;}
if (newOptions.color.inherit === undefined && colorsDefined === true) {
parentOptions.color.inherit.enabled = false;
}
}
util.mergeOptions(parentOptions.color, newOptions.color, 'inherit');
}
}
updateLabelModule() {
this.labelModule.setOptions(this.options);
if (this.labelModule.baseSize !== undefined) {
this.baseFontSize = this.labelModule.baseSize;
}
}
updateEdgeType() {
let dataChanged = false;
let changeInType = true;
if (this.edgeType !== undefined) {
if (this.edgeType instanceof BezierEdgeDynamic && this.options.smooth.enabled === true && this.options.smooth.dynamic === true) {changeInType = false;}
if (this.edgeType instanceof BezierEdgeStatic && this.options.smooth.enabled === true && this.options.smooth.dynamic === false){changeInType = false;}
if (this.edgeType instanceof StraightEdge && this.options.smooth.enabled === false) {changeInType = false;}
if (changeInType === true) {
dataChanged = this.edgeType.cleanup();
}
}
if (changeInType === true) {
if (this.options.smooth.enabled === true) {
if (this.options.smooth.dynamic === true) {
dataChanged = true;
this.edgeType = new BezierEdgeDynamic(this.options, this.body, this.labelModule);
}
else {
this.edgeType = new BezierEdgeStatic(this.options, this.body, this.labelModule);
}
}
else {
this.edgeType = new StraightEdge(this.options, this.body, this.labelModule);
}
}
else {
// if nothing changes, we just set the options.
this.edgeType.setOptions(this.options);
}
return dataChanged;
}
/**
* Enable or disable the physics.
* @param status
*/
togglePhysics(status) {
if (this.options.smooth.enabled === true && this.options.smooth.dynamic === true) {
if (this.via === undefined) {
this.via.pptions.physics = status;
}
}
this.options.physics = status;
}
/**
* Connect an edge to its nodes
*/
connect() {
this.disconnect();
this.from = this.body.nodes[this.fromId] || undefined;
this.to = this.body.nodes[this.toId] || undefined;
this.connected = (this.from !== undefined && this.to !== undefined);
if (this.connected === true) {
this.from.attachEdge(this);
this.to.attachEdge(this);
}
else {
if (this.from) {
this.from.detachEdge(this);
}
if (this.to) {
this.to.detachEdge(this);
}
}
}
/**
* Disconnect an edge from its nodes
*/
disconnect() {
if (this.from) {
this.from.detachEdge(this);
this.from = undefined;
}
if (this.to) {
this.to.detachEdge(this);
this.to = undefined;
}
this.connected = false;
}
/**
* get the title of this edge.
* @return {string} title The title of the edge, or undefined when no title
* has been set.
*/
getTitle() {
return typeof this.title === "function" ? this.title() : this.title;
}
/**
* check if this node is selecte
* @return {boolean} selected True if node is selected, else false
*/
isSelected() {
return this.selected;
}
/**
* Retrieve the value of the edge. Can be undefined
* @return {Number} value
*/
getValue() {
return this.options.value;
}
/**
* Adjust the value range of the edge. The edge will adjust it's width
* based on its value.
* @param {Number} min
* @param {Number} max
* @param total
*/
setValueRange(min, max, total) {
if (this.options.value !== undefined) {
var scale = this.options.scaling.customScalingFunction(min, max, total, this.options.value);
var widthDiff = this.options.scaling.max - this.options.scaling.min;
if (this.options.scaling.label.enabled === true) {
var fontDiff = this.options.scaling.label.max - this.options.scaling.label.min;
this.options.font.size = this.options.scaling.label.min + scale * fontDiff;
}
this.options.width = this.options.scaling.min + scale * widthDiff;
}
else {
this.options.width = this.baseWidth;
this.options.font.size = this.baseFontSize;
}
}
/**
* Redraw a edge
* Draw this edge in the given canvas
* The 2d context of a HTML canvas can be retrieved by canvas.getContext("2d");
* @param {CanvasRenderingContext2D} ctx
*/
draw(ctx) {
let via = this.edgeType.drawLine(ctx, this.selected, this.hover);
this.drawArrows(ctx, via);
this.drawLabel (ctx, via);
}
drawArrows(ctx, viaNode) {
if (this.options.arrows.from.enabled === true) {this.edgeType.drawArrowHead(ctx,'from', viaNode, this.selected, this.hover);}
if (this.options.arrows.middle.enabled === true) {this.edgeType.drawArrowHead(ctx,'middle', viaNode, this.selected, this.hover);}
if (this.options.arrows.to.enabled === true) {this.edgeType.drawArrowHead(ctx,'to', viaNode, this.selected, this.hover);}
}
drawLabel(ctx, viaNode) {
if (this.options.label !== undefined) {
// set style
var node1 = this.from;
var node2 = this.to;
var selected = (this.from.selected || this.to.selected || this.selected);
if (node1.id != node2.id) {
var point = this.edgeType.getPoint(0.5, viaNode);
ctx.save();
// if the label has to be rotated:
if (this.options.font.align !== "horizontal") {
this.labelModule.calculateLabelSize(ctx,selected,point.x,point.y);
ctx.translate(point.x, this.labelModule.size.yLine);
this._rotateForLabelAlignment(ctx);
}
// draw the label
this.labelModule.draw(ctx, point.x, point.y, selected);
ctx.restore();
}
else {
var x, y;
var radius = this.options.selfReferenceSize;
if (node1.width > node1.height) {
x = node1.x + node1.width * 0.5;
y = node1.y - radius;
}
else {
x = node1.x + radius;
y = node1.y - node1.height * 0.5;
}
point = this._pointOnCircle(x, y, radius, 0.125);
this.labelModule.draw(ctx, point.x, point.y, selected);
}
}
}
/**
* Check if this object is overlapping with the provided object
* @param {Object} obj an object with parameters left, top
* @return {boolean} True if location is located on the edge
*/
isOverlappingWith(obj) {
if (this.connected) {
var distMax = 10;
var xFrom = this.from.x;
var yFrom = this.from.y;
var xTo = this.to.x;
var yTo = this.to.y;
var xObj = obj.left;
var yObj = obj.top;
var dist = this.edgeType.getDistanceToEdge(xFrom, yFrom, xTo, yTo, xObj, yObj);
return (dist < distMax);
}
else {
return false
}
}
/**
* Rotates the canvas so the text is most readable
* @param {CanvasRenderingContext2D} ctx
* @private
*/
_rotateForLabelAlignment(ctx) {
var dy = this.from.y - this.to.y;
var dx = this.from.x - this.to.x;
var angleInDegrees = Math.atan2(dy, dx);
// rotate so label it is readable
if ((angleInDegrees < -1 && dx < 0) || (angleInDegrees > 0 && dx < 0)) {
angleInDegrees = angleInDegrees + Math.PI;
}
ctx.rotate(angleInDegrees);
}
/**
* Get a point on a circle
* @param {Number} x
* @param {Number} y
* @param {Number} radius
* @param {Number} percentage. Value between 0 (line start) and 1 (line end)
* @return {Object} point
* @private
*/
_pointOnCircle(x, y, radius, percentage) {
var angle = percentage * 2 * Math.PI;
return {
x: x + radius * Math.cos(angle),
y: y - radius * Math.sin(angle)
}
}
select() {
this.selected = true;
}
unselect() {
this.selected = false;
}
}
export default Edge;