scratchfoundation/paper.js
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Shorten Raster#getAverageColor().

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This commit is contained in:
Jürg Lehni 2011-05-19 18:47:49 +01:00
parent b103af4216
commit e8d4a16ab2
1 changed files with 7 additions and 14 deletions
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21
src/item/Raster.js
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@ -188,27 +188,20 @@ var Raster = this.Raster = Item.extend({
} else if (object.x) { } else if (object.x) {
bounds = Rectangle.create(object.x - 0.5, object.y - 0.5, 1, 1); bounds = Rectangle.create(object.x - 0.5, object.y - 0.5, 1, 1);
} }
var width = bounds.width, var sampleSize = 32,
height = bounds.height, width = Math.min(bounds.width, sampleSize),
sampleSize = 32, height = Math.min(bounds.height, sampleSize);
scaleX = Math.min(sampleSize / width, 1), var ctx = Raster._sampleContext;
scaleY = Math.min(sampleSize / height, 1), if (!ctx) {
top = bounds.y,
left = bounds.x;
width *= scaleX;
height *= scaleY;
var ctx;
if (!Raster._sampleContext) {
ctx = Raster._sampleContext = CanvasProvider.getCanvas( ctx = Raster._sampleContext = CanvasProvider.getCanvas(
new Size(sampleSize)).getContext('2d'); new Size(sampleSize)).getContext('2d');
} else { } else {
ctx = Raster._sampleContext;
// Clear the sample canvas: // Clear the sample canvas:
ctx.clearRect(0, 0, sampleSize, sampleSize); ctx.clearRect(0, 0, sampleSize, sampleSize);
} }
ctx.save(); ctx.save();
ctx.scale(scaleX, scaleY) ctx.scale(width / bounds.width, height / bounds.height);
ctx.translate(-left, -top); ctx.translate(-bounds.x, -bounds.y);
// If a path was passed, draw it as a clipping mask: // If a path was passed, draw it as a clipping mask:
if (path) { if (path) {
path.draw(ctx, { ignoreStyle: true }); path.draw(ctx, { ignoreStyle: true });