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