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.
62 lines
1.8 KiB
62 lines
1.8 KiB
import BezierEdgeBase from './BezierEdgeBase'
|
|
|
|
/**
|
|
* A Base Class for all Cubic Bezier Edges. Bezier curves are used to model
|
|
* smooth gradual curves in paths between nodes.
|
|
*
|
|
* @extends BezierEdgeBase
|
|
*/
|
|
class CubicBezierEdgeBase extends BezierEdgeBase {
|
|
/**
|
|
* @param {Object} options
|
|
* @param {Object} body
|
|
* @param {Label} labelModule
|
|
*/
|
|
constructor(options, body, labelModule) {
|
|
super(options, body, labelModule);
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* https://en.wikipedia.org/wiki/B%C3%A9zier_curve
|
|
* @param {number} x1 from x
|
|
* @param {number} y1 from y
|
|
* @param {number} x2 to x
|
|
* @param {number} y2 to y
|
|
* @param {number} x3 point to check x
|
|
* @param {number} y3 point to check y
|
|
* @param {Node} via1
|
|
* @param {Node} via2
|
|
* @returns {number}
|
|
* @private
|
|
*/
|
|
_getDistanceToBezierEdge(x1, y1, x2, y2, x3, y3, via1, via2) { // x3,y3 is the point
|
|
let minDistance = 1e9;
|
|
let distance;
|
|
let i, t, x, y;
|
|
let lastX = x1;
|
|
let lastY = y1;
|
|
let vec = [0,0,0,0]
|
|
for (i = 1; i < 10; i++) {
|
|
t = 0.1 * i;
|
|
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);
|
|
x = vec[0] * x1 + vec[1] * via1.x + vec[2] * via2.x + vec[3] * x2;
|
|
y = vec[0] * y1 + vec[1] * via1.y + vec[2] * via2.y + vec[3] * y2;
|
|
if (i > 0) {
|
|
distance = this._getDistanceToLine(lastX, lastY, x, y, x3, y3);
|
|
minDistance = distance < minDistance ? distance : minDistance;
|
|
}
|
|
lastX = x;
|
|
lastY = y;
|
|
}
|
|
|
|
return minDistance;
|
|
}
|
|
}
|
|
|
|
export default CubicBezierEdgeBase;
|