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969 lines
29 KiB
969 lines
29 KiB
var util = require('../util');
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var Node = require('./Node');
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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 properties. Must contain
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* At least properties from and to.
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* Available properties: 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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function Edge (properties, network, constants) {
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if (!network) {
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throw "No network provided";
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}
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this.network = network;
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// initialize constants
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this.widthMin = constants.edges.widthMin;
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this.widthMax = constants.edges.widthMax;
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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.style = constants.edges.style;
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this.title = undefined;
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this.width = constants.edges.width;
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this.widthSelectionMultiplier = constants.edges.widthSelectionMultiplier;
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this.widthSelected = this.width * this.widthSelectionMultiplier;
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this.hoverWidth = constants.edges.hoverWidth;
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this.value = undefined;
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this.length = constants.physics.springLength;
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this.customLength = false;
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this.selected = false;
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this.hover = false;
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this.smooth = constants.smoothCurves;
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this.arrowScaleFactor = constants.edges.arrowScaleFactor;
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this.from = null; // a node
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this.to = null; // a node
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this.via = null; // a temp node
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// we use this to be able to reconnect the edge to a cluster if its node is put into a cluster
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// by storing the original information we can revert to the original connection when the cluser is opened.
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this.originalFromId = [];
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this.originalToId = [];
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this.connected = false;
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// Added to support dashed lines
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// David Jordan
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// 2012-08-08
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this.dash = util.extend({}, constants.edges.dash); // contains properties length, gap, altLength
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this.color = {color:constants.edges.color.color,
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highlight:constants.edges.color.highlight,
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hover:constants.edges.color.hover};
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this.widthFixed = false;
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this.lengthFixed = false;
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this.setProperties(properties, constants);
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this.controlNodesEnabled = false;
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this.controlNodes = {from:null, to:null, positions:{}};
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this.connectedNode = null;
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}
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/**
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* Set or overwrite properties for the edge
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* @param {Object} properties an object with properties
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* @param {Object} constants and object with default, global properties
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*/
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Edge.prototype.setProperties = function(properties, constants) {
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if (!properties) {
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return;
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}
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if (properties.from !== undefined) {this.fromId = properties.from;}
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if (properties.to !== undefined) {this.toId = properties.to;}
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if (properties.id !== undefined) {this.id = properties.id;}
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if (properties.style !== undefined) {this.style = properties.style;}
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if (properties.label !== undefined) {this.label = properties.label;}
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if (this.label) {
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this.fontSize = constants.edges.fontSize;
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this.fontFace = constants.edges.fontFace;
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this.fontColor = constants.edges.fontColor;
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this.fontFill = constants.edges.fontFill;
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if (properties.fontColor !== undefined) {this.fontColor = properties.fontColor;}
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if (properties.fontSize !== undefined) {this.fontSize = properties.fontSize;}
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if (properties.fontFace !== undefined) {this.fontFace = properties.fontFace;}
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if (properties.fontFill !== undefined) {this.fontFill = properties.fontFill;}
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}
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if (properties.title !== undefined) {this.title = properties.title;}
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if (properties.width !== undefined) {this.width = properties.width;}
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if (properties.widthSelectionMultiplier !== undefined)
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{this.widthSelectionMultiplier = properties.widthSelectionMultiplier;}
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if (properties.hoverWidth !== undefined) {this.hoverWidth = properties.hoverWidth;}
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if (properties.value !== undefined) {this.value = properties.value;}
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if (properties.length !== undefined) {this.length = properties.length;
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this.customLength = true;}
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// scale the arrow
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if (properties.arrowScaleFactor !== undefined) {this.arrowScaleFactor = properties.arrowScaleFactor;}
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// Added to support dashed lines
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// David Jordan
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// 2012-08-08
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if (properties.dash) {
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if (properties.dash.length !== undefined) {this.dash.length = properties.dash.length;}
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if (properties.dash.gap !== undefined) {this.dash.gap = properties.dash.gap;}
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if (properties.dash.altLength !== undefined) {this.dash.altLength = properties.dash.altLength;}
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}
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if (properties.color !== undefined) {
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if (util.isString(properties.color)) {
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this.color.color = properties.color;
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this.color.highlight = properties.color;
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}
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else {
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if (properties.color.color !== undefined) {this.color.color = properties.color.color;}
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if (properties.color.highlight !== undefined) {this.color.highlight = properties.color.highlight;}
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if (properties.color.hover !== undefined) {this.color.hover = properties.color.hover;}
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}
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}
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// A node is connected when it has a from and to node.
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this.connect();
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this.widthFixed = this.widthFixed || (properties.width !== undefined);
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this.lengthFixed = this.lengthFixed || (properties.length !== undefined);
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this.widthSelected = this.width * this.widthSelectionMultiplier;
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// set draw method based on style
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switch (this.style) {
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case 'line': this.draw = this._drawLine; break;
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case 'arrow': this.draw = this._drawArrow; break;
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case 'arrow-center': this.draw = this._drawArrowCenter; break;
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case 'dash-line': this.draw = this._drawDashLine; break;
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default: this.draw = this._drawLine; break;
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}
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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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Edge.prototype.connect = function () {
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this.disconnect();
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this.from = this.network.nodes[this.fromId] || null;
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this.to = this.network.nodes[this.toId] || null;
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this.connected = (this.from && this.to);
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if (this.connected) {
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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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Edge.prototype.disconnect = function () {
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if (this.from) {
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this.from.detachEdge(this);
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this.from = null;
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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 = null;
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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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Edge.prototype.getTitle = function() {
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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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* Retrieve the value of the edge. Can be undefined
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* @return {Number} value
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*/
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Edge.prototype.getValue = function() {
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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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*/
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Edge.prototype.setValueRange = function(min, max) {
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if (!this.widthFixed && this.value !== undefined) {
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var scale = (this.widthMax - this.widthMin) / (max - min);
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this.width = (this.value - min) * scale + this.widthMin;
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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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Edge.prototype.draw = function(ctx) {
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throw "Method draw not initialized in edge";
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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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Edge.prototype.isOverlappingWith = function(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._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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* Redraw a edge as a line
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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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* @private
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*/
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Edge.prototype._drawLine = function(ctx) {
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// set style
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if (this.selected == true) {ctx.strokeStyle = this.color.highlight;}
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else if (this.hover == true) {ctx.strokeStyle = this.color.hover;}
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else {ctx.strokeStyle = this.color.color;}
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ctx.lineWidth = this._getLineWidth();
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if (this.from != this.to) {
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// draw line
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this._line(ctx);
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// draw label
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var point;
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if (this.label) {
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if (this.smooth == true) {
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var midpointX = 0.5*(0.5*(this.from.x + this.via.x) + 0.5*(this.to.x + this.via.x));
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var midpointY = 0.5*(0.5*(this.from.y + this.via.y) + 0.5*(this.to.y + this.via.y));
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point = {x:midpointX, y:midpointY};
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}
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else {
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point = this._pointOnLine(0.5);
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}
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this._label(ctx, this.label, point.x, point.y);
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}
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}
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else {
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var x, y;
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var radius = this.length / 4;
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var node = this.from;
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if (!node.width) {
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node.resize(ctx);
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}
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if (node.width > node.height) {
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x = node.x + node.width / 2;
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y = node.y - radius;
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}
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else {
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x = node.x + radius;
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y = node.y - node.height / 2;
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}
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this._circle(ctx, x, y, radius);
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point = this._pointOnCircle(x, y, radius, 0.5);
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this._label(ctx, this.label, point.x, point.y);
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}
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};
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/**
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* Get the line width of the edge. Depends on width and whether one of the
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* connected nodes is selected.
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* @return {Number} width
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* @private
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*/
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Edge.prototype._getLineWidth = function() {
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if (this.selected == true) {
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return Math.min(this.widthSelected, this.widthMax)*this.networkScaleInv;
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}
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else {
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if (this.hover == true) {
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return Math.min(this.hoverWidth, this.widthMax)*this.networkScaleInv;
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}
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else {
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return this.width*this.networkScaleInv;
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}
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}
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};
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/**
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* Draw a line between two nodes
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* @param {CanvasRenderingContext2D} ctx
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* @private
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*/
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Edge.prototype._line = function (ctx) {
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// draw a straight line
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ctx.beginPath();
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ctx.moveTo(this.from.x, this.from.y);
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if (this.smooth == true) {
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ctx.quadraticCurveTo(this.via.x,this.via.y,this.to.x, this.to.y);
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}
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else {
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ctx.lineTo(this.to.x, this.to.y);
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}
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ctx.stroke();
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};
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/**
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* Draw a line from a node to itself, a circle
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* @param {CanvasRenderingContext2D} ctx
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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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* @private
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*/
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Edge.prototype._circle = function (ctx, x, y, radius) {
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// draw a circle
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ctx.beginPath();
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ctx.arc(x, y, radius, 0, 2 * Math.PI, false);
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ctx.stroke();
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};
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/**
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* Draw label with white background and with the middle at (x, y)
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* @param {CanvasRenderingContext2D} ctx
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* @param {String} text
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* @param {Number} x
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* @param {Number} y
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* @private
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*/
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Edge.prototype._label = function (ctx, text, x, y) {
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if (text) {
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// TODO: cache the calculated size
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ctx.font = ((this.from.selected || this.to.selected) ? "bold " : "") +
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this.fontSize + "px " + this.fontFace;
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ctx.fillStyle = this.fontFill;
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var width = ctx.measureText(text).width;
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var height = this.fontSize;
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var left = x - width / 2;
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var top = y - height / 2;
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ctx.fillRect(left, top, width, height);
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// draw text
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ctx.fillStyle = this.fontColor || "black";
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ctx.textAlign = "left";
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ctx.textBaseline = "top";
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ctx.fillText(text, left, top);
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}
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};
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/**
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* Redraw a edge as a dashed line
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* Draw this edge in the given canvas
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* @author David Jordan
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* @date 2012-08-08
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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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* @private
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*/
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Edge.prototype._drawDashLine = function(ctx) {
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// set style
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if (this.selected == true) {ctx.strokeStyle = this.color.highlight;}
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else if (this.hover == true) {ctx.strokeStyle = this.color.hover;}
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else {ctx.strokeStyle = this.color.color;}
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ctx.lineWidth = this._getLineWidth();
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// only firefox and chrome support this method, else we use the legacy one.
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if (ctx.mozDash !== undefined || ctx.setLineDash !== undefined) {
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ctx.beginPath();
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ctx.moveTo(this.from.x, this.from.y);
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// configure the dash pattern
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var pattern = [0];
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if (this.dash.length !== undefined && this.dash.gap !== undefined) {
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pattern = [this.dash.length,this.dash.gap];
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}
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else {
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pattern = [5,5];
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}
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// set dash settings for chrome or firefox
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if (typeof ctx.setLineDash !== 'undefined') { //Chrome
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ctx.setLineDash(pattern);
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ctx.lineDashOffset = 0;
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} else { //Firefox
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ctx.mozDash = pattern;
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ctx.mozDashOffset = 0;
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}
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// draw the line
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if (this.smooth == true) {
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ctx.quadraticCurveTo(this.via.x,this.via.y,this.to.x, this.to.y);
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}
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else {
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ctx.lineTo(this.to.x, this.to.y);
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}
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ctx.stroke();
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// restore the dash settings.
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if (typeof ctx.setLineDash !== 'undefined') { //Chrome
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ctx.setLineDash([0]);
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ctx.lineDashOffset = 0;
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} else { //Firefox
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ctx.mozDash = [0];
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ctx.mozDashOffset = 0;
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}
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}
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else { // unsupporting smooth lines
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// draw dashed line
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ctx.beginPath();
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ctx.lineCap = 'round';
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if (this.dash.altLength !== undefined) //If an alt dash value has been set add to the array this value
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{
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ctx.dashedLine(this.from.x,this.from.y,this.to.x,this.to.y,
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[this.dash.length,this.dash.gap,this.dash.altLength,this.dash.gap]);
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}
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else if (this.dash.length !== undefined && this.dash.gap !== undefined) //If a dash and gap value has been set add to the array this value
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{
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ctx.dashedLine(this.from.x,this.from.y,this.to.x,this.to.y,
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[this.dash.length,this.dash.gap]);
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}
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else //If all else fails draw a line
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{
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ctx.moveTo(this.from.x, this.from.y);
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ctx.lineTo(this.to.x, this.to.y);
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}
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ctx.stroke();
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}
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// draw label
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if (this.label) {
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var point;
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if (this.smooth == true) {
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var midpointX = 0.5*(0.5*(this.from.x + this.via.x) + 0.5*(this.to.x + this.via.x));
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var midpointY = 0.5*(0.5*(this.from.y + this.via.y) + 0.5*(this.to.y + this.via.y));
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point = {x:midpointX, y:midpointY};
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}
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else {
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point = this._pointOnLine(0.5);
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}
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this._label(ctx, this.label, point.x, point.y);
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}
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};
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/**
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* Get a point on a line
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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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Edge.prototype._pointOnLine = function (percentage) {
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return {
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x: (1 - percentage) * this.from.x + percentage * this.to.x,
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y: (1 - percentage) * this.from.y + percentage * this.to.y
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}
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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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Edge.prototype._pointOnCircle = function (x, y, radius, percentage) {
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var angle = (percentage - 3/8) * 2 * Math.PI;
|
|
return {
|
|
x: x + radius * Math.cos(angle),
|
|
y: y - radius * Math.sin(angle)
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Redraw a edge as a line with an arrow halfway the line
|
|
* Draw this edge in the given canvas
|
|
* The 2d context of a HTML canvas can be retrieved by canvas.getContext("2d");
|
|
* @param {CanvasRenderingContext2D} ctx
|
|
* @private
|
|
*/
|
|
Edge.prototype._drawArrowCenter = function(ctx) {
|
|
var point;
|
|
// set style
|
|
if (this.selected == true) {ctx.strokeStyle = this.color.highlight; ctx.fillStyle = this.color.highlight;}
|
|
else if (this.hover == true) {ctx.strokeStyle = this.color.hover; ctx.fillStyle = this.color.hover;}
|
|
else {ctx.strokeStyle = this.color.color; ctx.fillStyle = this.color.color;}
|
|
ctx.lineWidth = this._getLineWidth();
|
|
|
|
if (this.from != this.to) {
|
|
// draw line
|
|
this._line(ctx);
|
|
|
|
var angle = Math.atan2((this.to.y - this.from.y), (this.to.x - this.from.x));
|
|
var length = (10 + 5 * this.width) * this.arrowScaleFactor;
|
|
// draw an arrow halfway the line
|
|
if (this.smooth == true) {
|
|
var midpointX = 0.5*(0.5*(this.from.x + this.via.x) + 0.5*(this.to.x + this.via.x));
|
|
var midpointY = 0.5*(0.5*(this.from.y + this.via.y) + 0.5*(this.to.y + this.via.y));
|
|
point = {x:midpointX, y:midpointY};
|
|
}
|
|
else {
|
|
point = this._pointOnLine(0.5);
|
|
}
|
|
|
|
ctx.arrow(point.x, point.y, angle, length);
|
|
ctx.fill();
|
|
ctx.stroke();
|
|
|
|
// draw label
|
|
if (this.label) {
|
|
this._label(ctx, this.label, point.x, point.y);
|
|
}
|
|
}
|
|
else {
|
|
// draw circle
|
|
var x, y;
|
|
var radius = 0.25 * Math.max(100,this.length);
|
|
var node = this.from;
|
|
if (!node.width) {
|
|
node.resize(ctx);
|
|
}
|
|
if (node.width > node.height) {
|
|
x = node.x + node.width * 0.5;
|
|
y = node.y - radius;
|
|
}
|
|
else {
|
|
x = node.x + radius;
|
|
y = node.y - node.height * 0.5;
|
|
}
|
|
this._circle(ctx, x, y, radius);
|
|
|
|
// draw all arrows
|
|
var angle = 0.2 * Math.PI;
|
|
var length = (10 + 5 * this.width) * this.arrowScaleFactor;
|
|
point = this._pointOnCircle(x, y, radius, 0.5);
|
|
ctx.arrow(point.x, point.y, angle, length);
|
|
ctx.fill();
|
|
ctx.stroke();
|
|
|
|
// draw label
|
|
if (this.label) {
|
|
point = this._pointOnCircle(x, y, radius, 0.5);
|
|
this._label(ctx, this.label, point.x, point.y);
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
* Redraw a edge as a line with an arrow
|
|
* Draw this edge in the given canvas
|
|
* The 2d context of a HTML canvas can be retrieved by canvas.getContext("2d");
|
|
* @param {CanvasRenderingContext2D} ctx
|
|
* @private
|
|
*/
|
|
Edge.prototype._drawArrow = function(ctx) {
|
|
// set style
|
|
if (this.selected == true) {ctx.strokeStyle = this.color.highlight; ctx.fillStyle = this.color.highlight;}
|
|
else if (this.hover == true) {ctx.strokeStyle = this.color.hover; ctx.fillStyle = this.color.hover;}
|
|
else {ctx.strokeStyle = this.color.color; ctx.fillStyle = this.color.color;}
|
|
|
|
ctx.lineWidth = this._getLineWidth();
|
|
|
|
var angle, length;
|
|
//draw a line
|
|
if (this.from != this.to) {
|
|
angle = Math.atan2((this.to.y - this.from.y), (this.to.x - this.from.x));
|
|
var dx = (this.to.x - this.from.x);
|
|
var dy = (this.to.y - this.from.y);
|
|
var edgeSegmentLength = Math.sqrt(dx * dx + dy * dy);
|
|
|
|
var fromBorderDist = this.from.distanceToBorder(ctx, angle + Math.PI);
|
|
var fromBorderPoint = (edgeSegmentLength - fromBorderDist) / edgeSegmentLength;
|
|
var xFrom = (fromBorderPoint) * this.from.x + (1 - fromBorderPoint) * this.to.x;
|
|
var yFrom = (fromBorderPoint) * this.from.y + (1 - fromBorderPoint) * this.to.y;
|
|
|
|
|
|
if (this.smooth == true) {
|
|
angle = Math.atan2((this.to.y - this.via.y), (this.to.x - this.via.x));
|
|
dx = (this.to.x - this.via.x);
|
|
dy = (this.to.y - this.via.y);
|
|
edgeSegmentLength = Math.sqrt(dx * dx + dy * dy);
|
|
}
|
|
var toBorderDist = this.to.distanceToBorder(ctx, angle);
|
|
var toBorderPoint = (edgeSegmentLength - toBorderDist) / edgeSegmentLength;
|
|
|
|
var xTo,yTo;
|
|
if (this.smooth == true) {
|
|
xTo = (1 - toBorderPoint) * this.via.x + toBorderPoint * this.to.x;
|
|
yTo = (1 - toBorderPoint) * this.via.y + toBorderPoint * this.to.y;
|
|
}
|
|
else {
|
|
xTo = (1 - toBorderPoint) * this.from.x + toBorderPoint * this.to.x;
|
|
yTo = (1 - toBorderPoint) * this.from.y + toBorderPoint * this.to.y;
|
|
}
|
|
|
|
ctx.beginPath();
|
|
ctx.moveTo(xFrom,yFrom);
|
|
if (this.smooth == true) {
|
|
ctx.quadraticCurveTo(this.via.x,this.via.y,xTo, yTo);
|
|
}
|
|
else {
|
|
ctx.lineTo(xTo, yTo);
|
|
}
|
|
ctx.stroke();
|
|
|
|
// draw arrow at the end of the line
|
|
length = (10 + 5 * this.width) * this.arrowScaleFactor;
|
|
ctx.arrow(xTo, yTo, angle, length);
|
|
ctx.fill();
|
|
ctx.stroke();
|
|
|
|
// draw label
|
|
if (this.label) {
|
|
var point;
|
|
if (this.smooth == true) {
|
|
var midpointX = 0.5*(0.5*(this.from.x + this.via.x) + 0.5*(this.to.x + this.via.x));
|
|
var midpointY = 0.5*(0.5*(this.from.y + this.via.y) + 0.5*(this.to.y + this.via.y));
|
|
point = {x:midpointX, y:midpointY};
|
|
}
|
|
else {
|
|
point = this._pointOnLine(0.5);
|
|
}
|
|
this._label(ctx, this.label, point.x, point.y);
|
|
}
|
|
}
|
|
else {
|
|
// draw circle
|
|
var node = this.from;
|
|
var x, y, arrow;
|
|
var radius = 0.25 * Math.max(100,this.length);
|
|
if (!node.width) {
|
|
node.resize(ctx);
|
|
}
|
|
if (node.width > node.height) {
|
|
x = node.x + node.width * 0.5;
|
|
y = node.y - radius;
|
|
arrow = {
|
|
x: x,
|
|
y: node.y,
|
|
angle: 0.9 * Math.PI
|
|
};
|
|
}
|
|
else {
|
|
x = node.x + radius;
|
|
y = node.y - node.height * 0.5;
|
|
arrow = {
|
|
x: node.x,
|
|
y: y,
|
|
angle: 0.6 * Math.PI
|
|
};
|
|
}
|
|
ctx.beginPath();
|
|
// TODO: similarly, for a line without arrows, draw to the border of the nodes instead of the center
|
|
ctx.arc(x, y, radius, 0, 2 * Math.PI, false);
|
|
ctx.stroke();
|
|
|
|
// draw all arrows
|
|
var length = (10 + 5 * this.width) * this.arrowScaleFactor;
|
|
ctx.arrow(arrow.x, arrow.y, arrow.angle, length);
|
|
ctx.fill();
|
|
ctx.stroke();
|
|
|
|
// draw label
|
|
if (this.label) {
|
|
point = this._pointOnCircle(x, y, radius, 0.5);
|
|
this._label(ctx, this.label, point.x, point.y);
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
* Calculate the distance between a point (x3,y3) and a line segment from
|
|
* (x1,y1) to (x2,y2).
|
|
* http://stackoverflow.com/questions/849211/shortest-distancae-between-a-point-and-a-line-segment
|
|
* @param {number} x1
|
|
* @param {number} y1
|
|
* @param {number} x2
|
|
* @param {number} y2
|
|
* @param {number} x3
|
|
* @param {number} y3
|
|
* @private
|
|
*/
|
|
Edge.prototype._getDistanceToEdge = function (x1,y1, x2,y2, x3,y3) { // x3,y3 is the point
|
|
if (this.from != this.to) {
|
|
if (this.smooth == true) {
|
|
var minDistance = 1e9;
|
|
var i,t,x,y,dx,dy;
|
|
for (i = 0; i < 10; i++) {
|
|
t = 0.1*i;
|
|
x = Math.pow(1-t,2)*x1 + (2*t*(1 - t))*this.via.x + Math.pow(t,2)*x2;
|
|
y = Math.pow(1-t,2)*y1 + (2*t*(1 - t))*this.via.y + Math.pow(t,2)*y2;
|
|
dx = Math.abs(x3-x);
|
|
dy = Math.abs(y3-y);
|
|
minDistance = Math.min(minDistance,Math.sqrt(dx*dx + dy*dy));
|
|
}
|
|
return minDistance
|
|
}
|
|
else {
|
|
var px = x2-x1,
|
|
py = y2-y1,
|
|
something = px*px + py*py,
|
|
u = ((x3 - x1) * px + (y3 - y1) * py) / something;
|
|
|
|
if (u > 1) {
|
|
u = 1;
|
|
}
|
|
else if (u < 0) {
|
|
u = 0;
|
|
}
|
|
|
|
var x = x1 + u * px,
|
|
y = y1 + u * py,
|
|
dx = x - x3,
|
|
dy = y - y3;
|
|
|
|
//# Note: If the actual distance does not matter,
|
|
//# if you only want to compare what this function
|
|
//# returns to other results of this function, you
|
|
//# can just return the squared distance instead
|
|
//# (i.e. remove the sqrt) to gain a little performance
|
|
|
|
return Math.sqrt(dx*dx + dy*dy);
|
|
}
|
|
}
|
|
else {
|
|
var x, y, dx, dy;
|
|
var radius = this.length / 4;
|
|
var node = this.from;
|
|
if (!node.width) {
|
|
node.resize(ctx);
|
|
}
|
|
if (node.width > node.height) {
|
|
x = node.x + node.width / 2;
|
|
y = node.y - radius;
|
|
}
|
|
else {
|
|
x = node.x + radius;
|
|
y = node.y - node.height / 2;
|
|
}
|
|
dx = x - x3;
|
|
dy = y - y3;
|
|
return Math.abs(Math.sqrt(dx*dx + dy*dy) - radius);
|
|
}
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
* This allows the zoom level of the network to influence the rendering
|
|
*
|
|
* @param scale
|
|
*/
|
|
Edge.prototype.setScale = function(scale) {
|
|
this.networkScaleInv = 1.0/scale;
|
|
};
|
|
|
|
|
|
Edge.prototype.select = function() {
|
|
this.selected = true;
|
|
};
|
|
|
|
Edge.prototype.unselect = function() {
|
|
this.selected = false;
|
|
};
|
|
|
|
Edge.prototype.positionBezierNode = function() {
|
|
if (this.via !== null) {
|
|
this.via.x = 0.5 * (this.from.x + this.to.x);
|
|
this.via.y = 0.5 * (this.from.y + this.to.y);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* This function draws the control nodes for the manipulator. In order to enable this, only set the this.controlNodesEnabled to true.
|
|
* @param ctx
|
|
*/
|
|
Edge.prototype._drawControlNodes = function(ctx) {
|
|
if (this.controlNodesEnabled == true) {
|
|
if (this.controlNodes.from === null && this.controlNodes.to === null) {
|
|
var nodeIdFrom = "edgeIdFrom:".concat(this.id);
|
|
var nodeIdTo = "edgeIdTo:".concat(this.id);
|
|
var constants = {
|
|
nodes:{group:'', radius:8},
|
|
physics:{damping:0},
|
|
clustering: {maxNodeSizeIncrements: 0 ,nodeScaling: {width:0, height: 0, radius:0}}
|
|
};
|
|
this.controlNodes.from = new Node(
|
|
{id:nodeIdFrom,
|
|
shape:'dot',
|
|
color:{background:'#ff4e00', border:'#3c3c3c', highlight: {background:'#07f968'}}
|
|
},{},{},constants);
|
|
this.controlNodes.to = new Node(
|
|
{id:nodeIdTo,
|
|
shape:'dot',
|
|
color:{background:'#ff4e00', border:'#3c3c3c', highlight: {background:'#07f968'}}
|
|
},{},{},constants);
|
|
}
|
|
|
|
if (this.controlNodes.from.selected == false && this.controlNodes.to.selected == false) {
|
|
this.controlNodes.positions = this.getControlNodePositions(ctx);
|
|
this.controlNodes.from.x = this.controlNodes.positions.from.x;
|
|
this.controlNodes.from.y = this.controlNodes.positions.from.y;
|
|
this.controlNodes.to.x = this.controlNodes.positions.to.x;
|
|
this.controlNodes.to.y = this.controlNodes.positions.to.y;
|
|
}
|
|
|
|
this.controlNodes.from.draw(ctx);
|
|
this.controlNodes.to.draw(ctx);
|
|
}
|
|
else {
|
|
this.controlNodes = {from:null, to:null, positions:{}};
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Enable control nodes.
|
|
* @private
|
|
*/
|
|
Edge.prototype._enableControlNodes = function() {
|
|
this.controlNodesEnabled = true;
|
|
};
|
|
|
|
/**
|
|
* disable control nodes
|
|
* @private
|
|
*/
|
|
Edge.prototype._disableControlNodes = function() {
|
|
this.controlNodesEnabled = false;
|
|
};
|
|
|
|
/**
|
|
* This checks if one of the control nodes is selected and if so, returns the control node object. Else it returns null.
|
|
* @param x
|
|
* @param y
|
|
* @returns {null}
|
|
* @private
|
|
*/
|
|
Edge.prototype._getSelectedControlNode = function(x,y) {
|
|
var positions = this.controlNodes.positions;
|
|
var fromDistance = Math.sqrt(Math.pow(x - positions.from.x,2) + Math.pow(y - positions.from.y,2));
|
|
var toDistance = Math.sqrt(Math.pow(x - positions.to.x ,2) + Math.pow(y - positions.to.y ,2));
|
|
|
|
if (fromDistance < 15) {
|
|
this.connectedNode = this.from;
|
|
this.from = this.controlNodes.from;
|
|
return this.controlNodes.from;
|
|
}
|
|
else if (toDistance < 15) {
|
|
this.connectedNode = this.to;
|
|
this.to = this.controlNodes.to;
|
|
return this.controlNodes.to;
|
|
}
|
|
else {
|
|
return null;
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* this resets the control nodes to their original position.
|
|
* @private
|
|
*/
|
|
Edge.prototype._restoreControlNodes = function() {
|
|
if (this.controlNodes.from.selected == true) {
|
|
this.from = this.connectedNode;
|
|
this.connectedNode = null;
|
|
this.controlNodes.from.unselect();
|
|
}
|
|
if (this.controlNodes.to.selected == true) {
|
|
this.to = this.connectedNode;
|
|
this.connectedNode = null;
|
|
this.controlNodes.to.unselect();
|
|
}
|
|
};
|
|
|
|
/**
|
|
* this calculates the position of the control nodes on the edges of the parent nodes.
|
|
*
|
|
* @param ctx
|
|
* @returns {{from: {x: number, y: number}, to: {x: *, y: *}}}
|
|
*/
|
|
Edge.prototype.getControlNodePositions = function(ctx) {
|
|
var angle = Math.atan2((this.to.y - this.from.y), (this.to.x - this.from.x));
|
|
var dx = (this.to.x - this.from.x);
|
|
var dy = (this.to.y - this.from.y);
|
|
var edgeSegmentLength = Math.sqrt(dx * dx + dy * dy);
|
|
var fromBorderDist = this.from.distanceToBorder(ctx, angle + Math.PI);
|
|
var fromBorderPoint = (edgeSegmentLength - fromBorderDist) / edgeSegmentLength;
|
|
var xFrom = (fromBorderPoint) * this.from.x + (1 - fromBorderPoint) * this.to.x;
|
|
var yFrom = (fromBorderPoint) * this.from.y + (1 - fromBorderPoint) * this.to.y;
|
|
|
|
|
|
if (this.smooth == true) {
|
|
angle = Math.atan2((this.to.y - this.via.y), (this.to.x - this.via.x));
|
|
dx = (this.to.x - this.via.x);
|
|
dy = (this.to.y - this.via.y);
|
|
edgeSegmentLength = Math.sqrt(dx * dx + dy * dy);
|
|
}
|
|
var toBorderDist = this.to.distanceToBorder(ctx, angle);
|
|
var toBorderPoint = (edgeSegmentLength - toBorderDist) / edgeSegmentLength;
|
|
|
|
var xTo,yTo;
|
|
if (this.smooth == true) {
|
|
xTo = (1 - toBorderPoint) * this.via.x + toBorderPoint * this.to.x;
|
|
yTo = (1 - toBorderPoint) * this.via.y + toBorderPoint * this.to.y;
|
|
}
|
|
else {
|
|
xTo = (1 - toBorderPoint) * this.from.x + toBorderPoint * this.to.x;
|
|
yTo = (1 - toBorderPoint) * this.from.y + toBorderPoint * this.to.y;
|
|
}
|
|
|
|
return {from:{x:xFrom,y:yFrom},to:{x:xTo,y:yTo}};
|
|
};
|
|
|
|
module.exports = Edge;
|