scratchfoundation/paper.js
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Simplify getGlobalMatrix().

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Jürg Lehni 2012-12-18 00:22:39 +01:00
parent 87393d130d
commit 9022bb232b
1 changed files with 11 additions and 18 deletions
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29
src/project/Project.js
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@ -285,22 +285,16 @@ var Project = this.Project = PaperScopeItem.extend(/** @lends Project# */{
// cached, only used for parents of items that this is called for.
function getGlobalMatrix(item, mx, cached) {
var cache = cached && matrices[item._id];
if (cache) {
// Found a cached version, copy over the values and return
mx.concatenate(cache);
return mx;
}
if (item._parent) {
// Get concatenated matrix from all the parents, using
// local caching (passing true for cached):
getGlobalMatrix(item._parent, mx, true);
// No need to concatenate if it's the identity matrix
if (!item._matrix.isIdentity())
mx.concatenate(item._matrix);
} else {
// Simply copy over the item's matrix, since it's the root
mx.initialize(item._matrix);
}
// Found a cached version? Return a clone of it.
if (cache)
return cache.clone();
// Get concatenated matrix from all the parents, using
// local caching (passing true for cached):
if (item._parent)
mx = getGlobalMatrix(item._parent, mx, true);
// No need to concatenate if it's the identity matrix
if (!item._matrix.isIdentity())
mx.concatenate(item._matrix);
// If the result needs to be cached, create a copy since matrix
// might be further modified through recursive calls
if (cached)
@ -309,8 +303,7 @@ var Project = this.Project = PaperScopeItem.extend(/** @lends Project# */{
}
for (var id in this._selectedItems) {
var item = this._selectedItems[id];
item.drawSelected(ctx,
getGlobalMatrix(item, new Matrix()).preConcatenate(matrix));
item.drawSelected(ctx, getGlobalMatrix(item, matrix.clone()));
}
ctx.restore();
}