X-Git-Url: http://git.ithinksw.org/extjs.git/blobdiff_plain/7a654f8d43fdb43d78b63d90528bed6e86b608cc..3789b528d8dd8aad4558e38e22d775bcab1cbd36:/docs/source/CubicBezier.html?ds=sidebyside
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+
+
+
+
+ The source code
+
+
+
+
+
+
+ /**
+ * @class Ext.fx.CubicBezier
+ * @ignore
+ */
+Ext.define('Ext.fx.CubicBezier', {
+
+ /* Begin Definitions */
+
+ singleton: true,
+
+ /* End Definitions */
+
+ cubicBezierAtTime: function(t, p1x, p1y, p2x, p2y, duration) {
+ var cx = 3 * p1x,
+ bx = 3 * (p2x - p1x) - cx,
+ ax = 1 - cx - bx,
+ cy = 3 * p1y,
+ by = 3 * (p2y - p1y) - cy,
+ ay = 1 - cy - by;
+ function sampleCurveX(t) {
+ return ((ax * t + bx) * t + cx) * t;
+ }
+ function solve(x, epsilon) {
+ var t = solveCurveX(x, epsilon);
+ return ((ay * t + by) * t + cy) * t;
+ }
+ function solveCurveX(x, epsilon) {
+ var t0, t1, t2, x2, d2, i;
+ for (t2 = x, i = 0; i < 8; i++) {
+ x2 = sampleCurveX(t2) - x;
+ if (Math.abs(x2) < epsilon) {
+ return t2;
+ }
+ d2 = (3 * ax * t2 + 2 * bx) * t2 + cx;
+ if (Math.abs(d2) < 1e-6) {
+ break;
+ }
+ t2 = t2 - x2 / d2;
+ }
+ t0 = 0;
+ t1 = 1;
+ t2 = x;
+ if (t2 < t0) {
+ return t0;
+ }
+ if (t2 > t1) {
+ return t1;
+ }
+ while (t0 < t1) {
+ x2 = sampleCurveX(t2);
+ if (Math.abs(x2 - x) < epsilon) {
+ return t2;
+ }
+ if (x > x2) {
+ t0 = t2;
+ } else {
+ t1 = t2;
+ }
+ t2 = (t1 - t0) / 2 + t0;
+ }
+ return t2;
+ }
+ return solve(t, 1 / (200 * duration));
+ },
+
+ cubicBezier: function(x1, y1, x2, y2) {
+ var fn = function(pos) {
+ return Ext.fx.CubicBezier.cubicBezierAtTime(pos, x1, y1, x2, y2, 1);
+ };
+ fn.toCSS3 = function() {
+ return 'cubic-bezier(' + [x1, y1, x2, y2].join(',') + ')';
+ };
+ fn.reverse = function() {
+ return Ext.fx.CubicBezier.cubicBezier(1 - x2, 1 - y2, 1 - x1, 1 - y1);
+ };
+ return fn;
+ }
+});
+
+