You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
93 lines
2.8 KiB
93 lines
2.8 KiB
import CubicBezierEdgeBase from './util/CubicBezierEdgeBase'
|
|
|
|
class CubicBezierEdge extends CubicBezierEdgeBase {
|
|
constructor(options, body, labelModule) {
|
|
super(options, body, labelModule);
|
|
}
|
|
|
|
/**
|
|
* Draw a line between two nodes
|
|
* @param {CanvasRenderingContext2D} ctx
|
|
* @private
|
|
*/
|
|
_line(ctx, values, viaNodes) {
|
|
// get the coordinates of the support points.
|
|
let via1 = viaNodes[0];
|
|
let via2 = viaNodes[1];
|
|
|
|
// start drawing the line.
|
|
ctx.beginPath();
|
|
ctx.moveTo(this.fromPoint.x, this.fromPoint.y);
|
|
|
|
// fallback to normal straight edges
|
|
if (viaNodes === undefined || via1.x === undefined) {
|
|
ctx.lineTo(this.toPoint.x, this.toPoint.y);
|
|
}
|
|
else {
|
|
ctx.bezierCurveTo(via1.x, via1.y, via2.x, via2.y, this.toPoint.x, this.toPoint.y);
|
|
}
|
|
// draw shadow if enabled
|
|
this.enableShadow(ctx, values);
|
|
ctx.stroke();
|
|
this.disableShadow(ctx, values);
|
|
}
|
|
|
|
_getViaCoordinates() {
|
|
let dx = this.from.x - this.to.x;
|
|
let dy = this.from.y - this.to.y;
|
|
|
|
let x1, y1, x2, y2;
|
|
let roundness = this.options.smooth.roundness;
|
|
|
|
// horizontal if x > y or if direction is forced or if direction is horizontal
|
|
if ((Math.abs(dx) > Math.abs(dy) || this.options.smooth.forceDirection === true || this.options.smooth.forceDirection === 'horizontal') && this.options.smooth.forceDirection !== 'vertical') {
|
|
y1 = this.from.y;
|
|
y2 = this.to.y;
|
|
x1 = this.from.x - roundness * dx;
|
|
x2 = this.to.x + roundness * dx;
|
|
}
|
|
else {
|
|
y1 = this.from.y - roundness * dy;
|
|
y2 = this.to.y + roundness * dy;
|
|
x1 = this.from.x;
|
|
x2 = this.to.x;
|
|
}
|
|
|
|
return [{x: x1, y: y1},{x: x2, y: y2}];
|
|
}
|
|
|
|
getViaNode() {
|
|
return this._getViaCoordinates();
|
|
}
|
|
|
|
_findBorderPosition(nearNode, ctx) {
|
|
return this._findBorderPositionBezier(nearNode, ctx);
|
|
}
|
|
|
|
_getDistanceToEdge(x1, y1, x2, y2, x3, y3, [via1, via2] = this._getViaCoordinates()) { // x3,y3 is the point
|
|
return this._getDistanceToBezierEdge(x1, y1, x2, y2, x3, y3, via1, via2);
|
|
}
|
|
|
|
/**
|
|
* 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, [via1, via2] = this._getViaCoordinates()) {
|
|
let t = percentage;
|
|
let vec = [];
|
|
vec[0] = Math.pow(1 - t, 3);
|
|
vec[1] = 3 * t * Math.pow(1 - t, 2);
|
|
vec[2] = 3 * Math.pow(t,2) * (1 - t);
|
|
vec[3] = Math.pow(t, 3);
|
|
let x = vec[0] * this.fromPoint.x + vec[1] * via1.x + vec[2] * via2.x + vec[3] * this.toPoint.x;
|
|
let y = vec[0] * this.fromPoint.y + vec[1] * via1.y + vec[2] * via2.y + vec[3] * this.toPoint.y;
|
|
|
|
return {x: x, y: y};
|
|
}
|
|
}
|
|
|
|
|
|
export default CubicBezierEdge;
|