import EdgeBase from './util/EdgeBase' class StraightEdge extends EdgeBase { constructor(options, body, labelModule) { super(options, body, labelModule); } /** * Draw a line between two nodes * @param {CanvasRenderingContext2D} ctx * @private */ _line(ctx) { // draw a straight line ctx.beginPath(); ctx.moveTo(this.from.x, this.from.y); ctx.lineTo(this.to.x, this.to.y); // draw shadow if enabled this.enableShadow(ctx); ctx.stroke(); this.disableShadow(ctx); return undefined; } /** * Combined function of pointOnLine and pointOnBezier. This gives the coordinates of a point on the line at a certain percentage of the way * @param percentage * @param via * @returns {{x: number, y: number}} * @private */ getPoint(percentage) { return { x: (1 - percentage) * this.from.x + percentage * this.to.x, y: (1 - percentage) * this.from.y + percentage * this.to.y } } _findBorderPosition(nearNode, ctx) { let node1 = this.to; let node2 = this.from; if (nearNode.id === this.from.id) { node1 = this.from; node2 = this.to; } let angle = Math.atan2((node1.y - node2.y), (node1.x - node2.x)); let dx = (node1.x - node2.x); let dy = (node1.y - node2.y); let edgeSegmentLength = Math.sqrt(dx * dx + dy * dy); let toBorderDist = nearNode.distanceToBorder(ctx, angle); let toBorderPoint = (edgeSegmentLength - toBorderDist) / edgeSegmentLength; let borderPos = {}; borderPos.x = (1 - toBorderPoint) * node2.x + toBorderPoint * node1.x; borderPos.y = (1 - toBorderPoint) * node2.y + toBorderPoint * node1.y; return borderPos; } _getDistanceToEdge(x1, y1, x2, y2, x3, y3) { // x3,y3 is the point return this._getDistanceToLine(x1, y1, x2, y2, x3, y3); } } export default StraightEdge;