/*
|
This file is part of Ext JS 4.2
|
|
Copyright (c) 2011-2013 Sencha Inc
|
|
Contact: http://www.sencha.com/contact
|
|
GNU General Public License Usage
|
This file may be used under the terms of the GNU General Public License version 3.0 as
|
published by the Free Software Foundation and appearing in the file LICENSE included in the
|
packaging of this file.
|
|
Please review the following information to ensure the GNU General Public License version 3.0
|
requirements will be met: http://www.gnu.org/copyleft/gpl.html.
|
|
If you are unsure which license is appropriate for your use, please contact the sales department
|
at http://www.sencha.com/contact.
|
|
Build date: 2013-05-16 14:36:50 (f9be68accb407158ba2b1be2c226a6ce1f649314)
|
*/
|
/**
|
* @private
|
*/
|
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;
|
}
|
});
|
