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Improve caching of decomposed transformation values.

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This commit is contained in:
Jürg Lehni 2013-12-07 12:47:16 +01:00
parent 9ca92165ee
commit 758c9b6146
1 changed files with 38 additions and 19 deletions
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57
src/item/Item.js
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@ -212,6 +212,7 @@ var Item = Base.extend(Callback, /** @lends Item# */{
// Clear cached bounds and position whenever geometry changes
delete this._bounds;
delete this._position;
delete this._decomposed;
}
if (parent && (flags
& (/*#=*/ ChangeFlag.GEOMETRY | /*#=*/ ChangeFlag.STROKE))) {
@ -962,22 +963,8 @@ var Item = Base.extend(Callback, /** @lends Item# */{
* @ignore
*/
}), /** @lends Item# */{
/**
* The current scaling of the item, as described by its {@link #matrix}.
*
* @type Point
* @bean
*/
getScaling: function() {
return this._matrix.getScaling();
},
setScaling: function(/* scale */) {
var scaling = this.getScaling();
if (scaling != null) {
var scale = Point.read(arguments);
this.scale(scale.x / scaling.x, scale.y / scaling.y);
}
_decompose: function() {
return this._decomposed = this._matrix.decompose();
},
/**
@ -987,12 +974,44 @@ var Item = Base.extend(Callback, /** @lends Item# */{
* @bean
*/
getRotation: function() {
return this._matrix.getRotation();
var decomposed = this._decomposed || this._decompose();
return decomposed && decomposed.rotation;
},
setRotation: function(rotation) {
if (rotation != null)
this.rotate(rotation - this.getRotation());
var current = this.getRotation();
if (current != null && rotation != null) {
// Preseve the cached _decomposed values over rotation, and only
// update the rotation property on it.
var decomposed = this._decomposed;
this.rotate(rotation - current);
decomposed.rotation = rotation;
this._decomposed = decomposed;
}
},
/**
* The current scaling of the item, as described by its {@link #matrix}.
*
* @type Point
* @bean
*/
getScaling: function() {
var decomposed = this._decomposed || this._decompose();
return decomposed && decomposed.scaling;
},
setScaling: function(/* scaling */) {
var current = this.getScaling();
if (current != null) {
// Clone existing points since we're caching internally.
var scaling = Point.read(arguments, 0, 0, { clone: true }),
// See #setRotation() for preservation of _decomposed.
decomposed = this._decomposed;
this.scale(scaling.x / current.x, scaling.y / current.y);
decomposed.scaling = scaling;
this._decomposed = decomposed;
}
},
/**