2 * @class Ext.fx.CubicBezier
5 Ext.define('Ext.fx.CubicBezier', {
7 /* Begin Definitions */
13 cubicBezierAtTime: function(t, p1x, p1y, p2x, p2y, duration) {
15 bx = 3 * (p2x - p1x) - cx,
18 by = 3 * (p2y - p1y) - cy,
20 function sampleCurveX(t) {
21 return ((ax * t + bx) * t + cx) * t;
23 function solve(x, epsilon) {
24 var t = solveCurveX(x, epsilon);
25 return ((ay * t + by) * t + cy) * t;
27 function solveCurveX(x, epsilon) {
28 var t0, t1, t2, x2, d2, i;
29 for (t2 = x, i = 0; i < 8; i++) {
30 x2 = sampleCurveX(t2) - x;
31 if (Math.abs(x2) < epsilon) {
34 d2 = (3 * ax * t2 + 2 * bx) * t2 + cx;
35 if (Math.abs(d2) < 1e-6) {
50 x2 = sampleCurveX(t2);
51 if (Math.abs(x2 - x) < epsilon) {
59 t2 = (t1 - t0) / 2 + t0;
63 return solve(t, 1 / (200 * duration));
66 cubicBezier: function(x1, y1, x2, y2) {
67 var fn = function(pos) {
68 return Ext.fx.CubicBezier.cubicBezierAtTime(pos, x1, y1, x2, y2, 1);
70 fn.toCSS3 = function() {
71 return 'cubic-bezier(' + [x1, y1, x2, y2].join(',') + ')';
73 fn.reverse = function() {
74 return Ext.fx.CubicBezier.cubicBezier(1 - x2, 1 - y2, 1 - x1, 1 - y1);