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index.js
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index.js
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/**
* A mixin to assist in managing 3d matrix transformations on a dom element
*/
var Transformations = exports.Transformations = {
/**
* initialize the transformations mixin
*/
initTransformations: function(options) {
this.setOptions(options);
this.pushMatrix();
},
/**
* handle the options passed into init or commit
*/
setOptions: function(options) {
for (var key in options) {
this['_' + key] = options[key];
}
},
/**
* set the transition duration to use for the transition
*/
setDuration: function(duration) {
this._duration = duration;
return this;
},
/**
* set the timing function to be used for the transition
*/
setTiming: function(timing) {
this._timing = timing;
return this;
},
/**
* set the opacity to be applied at the next commit
*/
setOpacity: function(opacity) {
this._opacity = opacity;
return this;
},
/**
* rotate the current matrix
*/
rotate: function() {
var o = this._normalizeArguments.apply(this, arguments);
this.setCurrentMatrix(this.getCurrentMatrix().rotate(o.x, o.y, o.z));
return this;
},
/**
* scale the current matrix
*/
scale: function() {
var o = this._normalizeArguments.apply(this, arguments);
this.setCurrentMatrix(this.getCurrentMatrix().scale(o.x, o.y, o.z));
return this;
},
/**
* perform a translation on the current matrix
*/
translate: function() {
var o = this._normalizeArguments.apply(this, arguments);
this.setCurrentMatrix(this.getCurrentMatrix().translate(o.x, o.y, o.z));
return this;
},
/**
* retrieve the top matrix from the stack
*/
getCurrentMatrix: function() {
if (this._matrices.length === 0) {
this.pushMatrix();
}
return this._matrices[this._matrices.length - 1];
},
/**
* update the top matrix on the stack
*/
setCurrentMatrix: function(val) {
if (this._matrices.length === 0) {
this.pushMatrix();
}
this._matrices[this._matrices.length - 1] = val;
return this;
},
/**
* push a matrix onto the stack. If no argument is provide an empty
* matrix is automatically created
*/
pushMatrix: function(matrix) {
this._matrices = this._matrices || [];
this._matrices.push(matrix || new WebKitCSSMatrix());
return this;
},
/**
* remove a matrix from the stack
*/
popMatrix: function() {
this._matrices.pop();
return this;
},
/**
* retrieve the current cumulative translation
*/
cumulativeTranslation: function() {
var transform = this.cumulativeTransformation();
return {
x: transform.m41,
y: transform.m42,
z: transform.m43
}
},
/**
* retrieve the current cumulative scale
*/
cumulativeScale: function() {
var transform = this.cumulativeTransformation();
return {
x: transform.m11,
y: transform.m22,
z: transform.m33
}
},
/**
* calculate the cumulative transformation matrix
*/
cumulativeTransformation: function() {
if (this._matrices.length === 0) {
return new WebKitCSSMatrix();
}
var matrix = this._matrices.reduce(function(memo, value) {
return memo.multiply(value);
});
return matrix;
},
/**
* apply the current stack of transformations
* @param {Object} options
* {Boolean} skipTransition - skip the transition for the current
* commit
*/
commit: function(options) {
options = options || {};
var skipTransition = options.skipTransition;
delete options.skipTransition;
var onFinish = options.onFinish;
delete options.onFinish;
this.setOptions(options || {});
// optionally skip the transition for this commit only
if (skipTransition) {
this._el.style.webkitTransitionProperty = '';
} else {
this._el.style.webkitTransitionProperty = '-webkit-transform, opacity';
this._el.style.webkitTransitionDuration = this._formatDuration(this._duration);
this._el.style.webkitTransitionTimingFunction = this._timing;
}
if (onFinish) {
if (skipTransition || !this._duration) {
onFinish();
} else {
var el = this._el;
this._el.addEventListener('webkitTransitionEnd', function() {
el.removeEventListener('webkitTransitionEnd', arguments.callee);
onFinish();
});
}
}
this._el.style.webkitTransform = this.cumulativeTransformation().toString();
if (typeof this._opacity !== 'undefined') {
this._el.style.opacity = this._opacity;
}
return this;
},
/**
* take the passed in arguments and convert them to a normalized object
* with x, y, z properties
* a single number argument will be converted to x:num, y:num, z:num
* three number arguments will be converted to x:num1, y:num2, z:num2
* an object argument will be left intact
*/
_normalizeArguments: function() {
var args = Array.prototype.slice.call(arguments, 0);
if (args.length > 1) {
return {x: args[0], y: args[1], z: args[2]};
} else if (Object(args[0]) === args[0]) {
return args[0];
} else {
return {x: args[0], y: args[0], z: args[0]};
}
},
_formatDuration: function() {
return this._duration + 's, ' + this._duration + 's';
}
};