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/* <copyright>
This file contains proprietary software owned by Motorola Mobility, Inc.<br/>
No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.<br/>
(c) Copyright 2011 Motorola Mobility, Inc. All Rights Reserved.
</copyright> */
/**
@module montage/core/geometry/cubic-bezier
@requires montage/core/core
@requires montage/core/geometry/point
*/
var Montage = require("montage").Montage;
var Point = require("core/geometry/point").Point;
/**
@class module:montage/core/geometry/cubic-bezier.CubicBezier
@extends module:montage/core/core.Montage
*/
var CubicBezier = exports.CubicBezier = Montage.create(Montage, /** @lends module:montage/core/geometry/cubic-bezier.CubicBezier# */{
/**
@function
@param {Array} controlPoints Control points.
@returns itself
*/
init: {
enumerable: false,
value: function(controlPoints) {
if (controlPoints !== null) {
if (controlPoints.length === 2) {
this.p1 = controlPoints[0];
this.p2 = controlPoints[1];
} else if (controlPoints.length === 4) {
this.p0 = controlPoints[0];
this.p1 = controlPoints[1];
this.p2 = controlPoints[2];
this.p3 = controlPoints[3];
}
}
return this;
}
},
/**
@function
@param {Number} t Control point.
@returns itself or Montage.create(Point).init(this.p0.x * b1 + this.p1.x * b2 + this.p2.x * b3 + this.p3.x * b4,
this.p0.y * b1 + this.p1.y * b2 + this.p2.y * b3 + this.p3.y * b4)
*/
position: {
enumerable: false,
value: function(t) {
if (t < 0 || t > 1) {
return;
}
t = 1 - t;
var b1 = t * t * t,
b2 = 3 * t * t * (1 - t),
b3 = 3 * t * (1 - t) * (1 - t),
b4 = (1 - t) * (1 - t) * (1 - t);
return Montage.create(Point).init(this.p0.x * b1 + this.p1.x * b2 + this.p2.x * b3 + this.p3.x * b4,
this.p0.y * b1 + this.p1.y * b2 + this.p2.y * b3 + this.p3.y * b4);
}
},
/**
@function
@param {Number} t Control point.
@returns CubicBezier.create(CubicBezier).init([this.p0, this.p01, this.p012, this.p0123])
*/
split: {
enumerable: false,
value: function(t) {
this.makeScaffolding(t);
return CubicBezier.create(CubicBezier).init([this.p0, this.p01, this.p012, this.p0123]);
}
},
/**
@function
@param {Number} t Control point.
@returns CubicBezier.create(CubicBezier).init([Montage.create(Point).init(this.p01.x / xScale, this.p01.y / yScale), Montage.create(Point).init(this.p012.x / xScale, this.p012.y / yScale)])
*/
splitToTimingFunction: {
enumerable: false,
value: function(t) {
this.makeScaffolding(t);
// p0123 x and y are the scale
var xScale = this.p0123.x,
yScale = this.p0123.y;
return CubicBezier.create(CubicBezier).init([Montage.create(Point).init(this.p01.x / xScale, this.p01.y / yScale), Montage.create(Point).init(this.p012.x / xScale, this.p012.y / yScale)]);
}
},
/**
@function
@param {Number} t Control point.
*/
makeScaffolding: {
enumerable: false,
value: function(t) {
t = 1 - t;
var precision = 1000000;
Montage.defineProperty(this, 'p01', {
value: Point.interpolate(t, this.p0, this.p1, precision)
});
Montage.defineProperty(this, 'p12', {
value: Point.interpolate(t, this.p1, this.p2, precision)
});
Montage.defineProperty(this, 'p23', {
value: Point.interpolate(t, this.p2, this.p3, precision)
});
Montage.defineProperty(this, 'p012', {
value: Point.interpolate(t, this.p01, this.p12, precision)
});
Montage.defineProperty(this, 'p123', {
value: Point.interpolate(t, this.p12, this.p23, precision)
});
Montage.defineProperty(this, 'p0123', {
value: Point.interpolate(t, this.p012, this.p123, precision)
});
}
},
/**
First control point in bezier curve.
@type {Property}
@default {Number} Montage.create(Point).init(0, 0)
*/
p0: {
enumerable: true,
value: Montage.create(Point).init(0, 0)
},
/**
Second control point in bezier curve.
@type {Property}
@default {Number} Montage.create(Point).init(0, 0)
*/
p1: {
enumerable: true,
value: Montage.create(Point).init(0, 0)
},
/**
Third control point in bezier curve.
@type {Property}
@default {Number} Montage.create(Point).init(1, 1)
*/
p2: {
enumerable: true,
value: Montage.create(Point).init(1, 1)
},
/**
Fourth control point in bezier curve.
@type {Property}
@default {Number}M ontage.create(Point).init(1, 1)
*/
p3: {
enumerable: true,
value: Montage.create(Point).init(1, 1)
}
});
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