scratchfoundation/paper.js
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Optimise Path#transformContent() by using Matrix#transform() version that handles arrays of multiple point values for much improved performance.

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This commit is contained in:
Jürg Lehni 2011-02-20 01:55:43 +01:00
parent ed752ed744
commit 6c4121db4b
1 changed files with 19 additions and 12 deletions
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31
src/path/Path.js
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@ -109,21 +109,28 @@ Path = PathItem.extend({
transformContent: function(matrix, flags) {
for (var i = 0, l = this._segments.length; i < l; i++) {
var segment = this._segments[i];
// Use matrix.transform version() that takes arrays of multiple
// points for largely improved performance, as no calls to
// Point.read() and Point constructors are necessary.
var point = segment.point;
var handleIn = segment.handleIn;
var handleOut = segment.handleOut;
var x = point.x, y = point.y;
// We need to convert handles to absolute coordinates in order
// to transform them.
// TODO: Is transformation even required if they are [0, 0]?
// TODO: Can we optimise this by using the matrix.transform()
// version that takes arrays as in and output values, and just
// modifying points rather than producing new ones? This would
// consume less memory for sure.
var point = segment.point;
var handleIn = segment.handleIn.add(point);
var handleOut = segment.handleOut.add(point);
point = matrix.transform(point);
segment.point = point;
// Convert handles back to relative values after transformation
segment.handleIn = matrix.transform(handleIn).subtract(point);
segment.handleOut = matrix.transform(handleOut).subtract(point);
var coords = [
x, y,
handleIn.x + x, handleIn.y + y,
handleOut.x + x, handleOut.y + y,
]
matrix.transform(coords, 0, coords, 0, 3);
point.x = x = coords[0];
point.y = y = coords[1];
handleIn.x = coords[2] - x;
handleIn.y = coords[3] - y;
handleOut.x = coords[4] - x;
handleOut.y = coords[5] - y;
}
},