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476 lines
14 KiB
476 lines
14 KiB
/**
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* Created by Alex on 3/20/2015.
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*/
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let util = require("../../../../../util")
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class EdgeBase {
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constructor(options, body, labelModule) {
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this.body = body;
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this.labelModule = labelModule;
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this.setOptions(options);
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this.colorDirty = true;
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this.color = {};
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}
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setOptions(options) {
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this.options = options;
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this.from = this.body.nodes[this.options.from];
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this.to = this.body.nodes[this.options.to];
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this.id = this.options.id;
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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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drawLine(ctx, selected, hover) {
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// set style
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ctx.strokeStyle = this.getColor(ctx);
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ctx.lineWidth = this.getLineWidth(selected, hover);
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let via = undefined;
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if (this.from != this.to) {
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// draw line
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if (this.options.dashes.enabled == true) {
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via = this._drawDashedLine(ctx);
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}
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else {
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via = this._line(ctx);
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}
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}
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else {
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let [x,y,radius] = this._getCircleData(ctx);
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this._circle(ctx, x, y, radius);
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}
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return via;
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}
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_drawDashedLine(ctx) {
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let via = undefined;
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// only firefox and chrome support this method, else we use the legacy one.
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if (ctx.setLineDash !== undefined && this.options.dashes.altLength === undefined) {
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ctx.save();
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// configure the dash pattern
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let pattern = [0];
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if (this.options.dashes.length !== undefined && this.options.dashes.gap !== undefined) {
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pattern = [this.options.dashes.length, this.options.dashes.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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ctx.setLineDash(pattern);
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ctx.lineDashOffset = 0;
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// draw the line
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via = this._line(ctx);
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// restore the dash settings.
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ctx.setLineDash([0]);
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ctx.lineDashOffset = 0;
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ctx.restore();
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}
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else { // unsupporting smooth lines
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// draw dashes line
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ctx.beginPath();
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ctx.lineCap = 'round';
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if (this.options.dashes.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.dashesLine(this.from.x, this.from.y, this.to.x, this.to.y,
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[this.options.dashes.length, this.options.dashes.gap, this.options.dashes.altLength, this.options.dashes.gap]);
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}
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else if (this.options.dashes.length !== undefined && this.options.dashes.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.dashesLine(this.from.x, this.from.y, this.to.x, this.to.y,
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[this.options.dashes.length, this.options.dashes.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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return via;
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}
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findBorderPosition(nearNode, ctx, options) {
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if (this.from != this.to) {
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return this._findBorderPosition(nearNode, ctx, options);
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}
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else {
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return this._findBorderPositionCircle(nearNode, ctx, options);
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}
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}
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findBorderPositions(ctx) {
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let from = {};
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let to = {};
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if (this.from != this.to) {
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from = this._findBorderPosition(this.from, ctx);
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to = this._findBorderPosition(this.to, ctx);
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}
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else {
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let [x,y,radius] = this._getCircleData(ctx);
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from = this._findBorderPositionCircle(this.from, ctx, {x, y, low:0.25, high:0.6, direction:-1});
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to = this._findBorderPositionCircle(this.from, ctx, {x, y, low:0.6, high:0.8, direction:1});
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}
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return {from, to};
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}
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_getCircleData(ctx) {
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let x, y;
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let node = this.from;
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let radius = this.options.selfReferenceSize;
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if (ctx !== undefined) {
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if (node.shape.width === undefined) {
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node.shape.resize(ctx);
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}
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}
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// get circle coordinates
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if (node.shape.width > node.shape.height) {
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x = node.x + node.shape.width * 0.5;
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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.shape.height * 0.5;
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}
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return [x,y,radius];
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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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let 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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/**
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* This function uses binary search to look for the point where the circle crosses the border of the node.
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* @param node
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* @param ctx
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* @param options
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* @returns {*}
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* @private
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*/
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_findBorderPositionCircle(node, ctx, options) {
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let x = options.x;
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let y = options.y;
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let low = options.low;
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let high = options.high;
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let direction = options.direction;
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let maxIterations = 10;
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let iteration = 0;
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let radius = this.options.selfReferenceSize;
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let pos, angle, distanceToBorder, distanceToPoint, difference;
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let threshold = 0.05;
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let middle = (low + high) * 0.5
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while (low <= high && iteration < maxIterations) {
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middle = (low + high) * 0.5;
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pos = this._pointOnCircle(x, y, radius, middle);
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angle = Math.atan2((node.y - pos.y), (node.x - pos.x));
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distanceToBorder = node.distanceToBorder(ctx, angle);
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distanceToPoint = Math.sqrt(Math.pow(pos.x - node.x, 2) + Math.pow(pos.y - node.y, 2));
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difference = distanceToBorder - distanceToPoint;
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if (Math.abs(difference) < threshold) {
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break; // found
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}
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else if (difference > 0) { // distance to nodes is larger than distance to border --> t needs to be bigger if we're looking at the to node.
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if (direction > 0) {
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low = middle;
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}
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else {
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high = middle;
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}
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}
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else {
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if (direction > 0) {
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high = middle;
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}
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else {
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low = middle;
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}
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}
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iteration++;
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}
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pos.t = middle;
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return pos;
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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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getLineWidth(selected, hover) {
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if (selected == true) {
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return Math.max(Math.min(this.options.widthSelectionMultiplier * this.options.width, this.options.scaling.max), 0.3 / this.body.view.scale);
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}
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else {
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if (hover == true) {
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return Math.max(Math.min(this.options.hoverWidth, this.options.scaling.max), 0.3 / this.body.view.scale);
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}
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else {
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return Math.max(this.options.width, 0.3 / this.body.view.scale);
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}
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}
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}
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getColor(ctx) {
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let colorOptions = this.options.color;
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if (colorOptions.inherit.enabled === true) {
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if (colorOptions.inherit.useGradients == true) {
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let grd = ctx.createLinearGradient(this.from.x, this.from.y, this.to.x, this.to.y);
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let fromColor, toColor;
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fromColor = this.from.options.color.highlight.border;
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toColor = this.to.options.color.highlight.border;
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if (this.from.selected == false && this.to.selected == false) {
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fromColor = util.overrideOpacity(this.from.options.color.border, this.options.color.opacity);
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toColor = util.overrideOpacity(this.to.options.color.border, this.options.color.opacity);
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}
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else if (this.from.selected == true && this.to.selected == false) {
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toColor = this.to.options.color.border;
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}
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else if (this.from.selected == false && this.to.selected == true) {
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fromColor = this.from.options.color.border;
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}
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grd.addColorStop(0, fromColor);
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grd.addColorStop(1, toColor);
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// -------------------- this returns -------------------- //
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return grd;
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}
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if (this.colorDirty === true) {
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if (colorOptions.inherit.source == "to") {
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this.color.highlight = this.to.options.color.highlight.border;
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this.color.hover = this.to.options.color.hover.border;
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this.color.color = util.overrideOpacity(this.to.options.color.border, colorOptions.opacity);
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}
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else { // (this.options.color.inherit.source == "from") {
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this.color.highlight = this.from.options.color.highlight.border;
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this.color.hover = this.from.options.color.hover.border;
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this.color.color = util.overrideOpacity(this.from.options.color.border, colorOptions.opacity);
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}
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}
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}
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else if (this.colorDirty === true) {
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this.color.highlight = colorOptions.highlight;
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this.color.hover = colorOptions.hover;
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this.color.color = util.overrideOpacity(colorOptions.color, colorOptions.opacity);
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}
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// if color inherit is on and gradients are used, the function has already returned by now.
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this.colorDirty = false;
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if (this.selected == true) {
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return this.color.highlight;
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}
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else if (this.hover == true) {
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return this.color.hover;
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}
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else {
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return this.color.color;
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}
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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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_circle(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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* Calculate the distance between a point (x3,y3) and a line segment from
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* (x1,y1) to (x2,y2).
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* http://stackoverflow.com/questions/849211/shortest-distancae-between-a-point-and-a-line-segment
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* @param {number} x1
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* @param {number} y1
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* @param {number} x2
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* @param {number} y2
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* @param {number} x3
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* @param {number} y3
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* @private
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*/
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getDistanceToEdge(x1, y1, x2, y2, x3, y3, via) { // x3,y3 is the point
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let returnValue = 0;
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if (this.from != this.to) {
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returnValue = this._getDistanceToEdge(x1, y1, x2, y2, x3, y3, via)
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}
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else {
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let [x,y,radius] = this._getCircleData();
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let dx = x - x3;
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let dy = y - y3;
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returnValue = Math.abs(Math.sqrt(dx * dx + dy * dy) - radius);
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}
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if (this.labelModule.size.left < x3 &&
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this.labelModule.size.left + this.labelModule.size.width > x3 &&
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this.labelModule.size.top < y3 &&
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this.labelModule.size.top + this.labelModule.size.height > y3) {
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return 0;
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}
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else {
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return returnValue;
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}
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}
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_getDistanceToLine(x1, y1, x2, y2, x3, y3) {
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let px = x2 - x1;
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let py = y2 - y1;
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let something = px * px + py * py;
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let u = ((x3 - x1) * px + (y3 - y1) * py) / something;
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if (u > 1) {
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u = 1;
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}
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else if (u < 0) {
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u = 0;
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}
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let x = x1 + u * px;
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let y = y1 + u * py;
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let dx = x - x3;
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let dy = y - y3;
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//# Note: If the actual distance does not matter,
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//# if you only want to compare what this function
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//# returns to other results of this function, you
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//# can just return the squared distance instead
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//# (i.e. remove the sqrt) to gain a little performance
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return Math.sqrt(dx * dx + dy * dy);
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}
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/**
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*
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* @param ctx
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* @param position
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* @param viaNode
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*/
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drawArrowHead(ctx, position, viaNode, selected, hover) {
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// set style
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ctx.strokeStyle = this.getColor(ctx);
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ctx.fillStyle = ctx.strokeStyle;
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ctx.lineWidth = this.getLineWidth(selected, hover);
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// set lets
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let angle;
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let length;
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let arrowPos;
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let node1;
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let node2;
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let guideOffset;
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let scaleFactor;
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if (position == 'from') {
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node1 = this.from;
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node2 = this.to;
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guideOffset = 0.1;
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scaleFactor = this.options.arrows.from.scaleFactor;
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}
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else if (position == 'to') {
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node1 = this.to;
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node2 = this.from;
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guideOffset = -0.1;
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scaleFactor = this.options.arrows.to.scaleFactor;
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}
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else {
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node1 = this.to;
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node2 = this.from;
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scaleFactor = this.options.arrows.middle.scaleFactor;
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}
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// if not connected to itself
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if (node1 != node2) {
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if (position !== 'middle') {
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// draw arrow head
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if (this.options.smooth.enabled == true) {
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arrowPos = this.findBorderPosition(node1, ctx, {via: viaNode});
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let guidePos = this.getPoint(Math.max(0.0, Math.min(1.0, arrowPos.t + guideOffset)), viaNode);
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angle = Math.atan2((arrowPos.y - guidePos.y), (arrowPos.x - guidePos.x));
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}
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else {
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angle = Math.atan2((node1.y - node2.y), (node1.x - node2.x));
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arrowPos = this.findBorderPosition(node1, ctx);
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}
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}
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else {
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angle = Math.atan2((node1.y - node2.y), (node1.x - node2.x));
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arrowPos = this.getPoint(0.6, viaNode); // this is 0.6 to account for the size of the arrow.
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}
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// draw arrow at the end of the line
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length = (10 + 5 * this.options.width) * scaleFactor;
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ctx.arrow(arrowPos.x, arrowPos.y, angle, length);
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ctx.fill();
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ctx.stroke();
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}
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else {
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// draw circle
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let angle, point;
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let [x,y,radius] = this._getCircleData(ctx);
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if (position == 'from') {
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point = this.findBorderPosition(this.from, ctx, {x, y, low:0.25, high:0.6, direction:-1});
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angle = point.t * -2 * Math.PI + 1.5 * Math.PI + 0.1 * Math.PI;
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}
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else if (position == 'to') {
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point = this.findBorderPosition(this.from, ctx, {x, y, low:0.6, high:1.0, direction:1});
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angle = point.t * -2 * Math.PI + 1.5 * Math.PI - 1.1 * Math.PI;
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}
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else {
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point = this._pointOnCircle(x, y, radius, 0.175);
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angle = 3.9269908169872414; // == 0.175 * -2 * Math.PI + 1.5 * Math.PI + 0.1 * Math.PI;
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}
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// draw the arrowhead
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let length = (10 + 5 * this.options.width) * scaleFactor;
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ctx.arrow(point.x, point.y, angle, length);
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ctx.fill();
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ctx.stroke();
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}
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}
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}
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export default EdgeBase;
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