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Simplify and optimise bounds calculations in Raster#transformContent().

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This commit is contained in:
Jürg Lehni 2011-02-28 20:22:11 +01:00
parent 0305c91e8c
commit aca79fc6a9
1 changed files with 11 additions and 16 deletions
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27
src/item/Raster.js
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@ -168,22 +168,17 @@ Raster = Item.extend({
x, y + height
];
this.matrix.transform(coords, 0, coords, 0, 4);
var xMin = coords[0], xMax = coords[0];
var yMin = coords[1], yMax = coords[1];
for(var i = 2; i < 8; i += 2) {
var x = coords[i];
var y = coords[i + 1];
xMin = Math.min(x, xMin);
xMax = Math.max(x, xMax);
yMin = Math.min(y, yMin);
yMax = Math.max(y, yMax);
};
var bounds = this._bounds;
bounds.x = xMin;
bounds.y = yMin;
bounds.width = xMax - xMin;
bounds.height = yMax - yMin;
// Loop through all x and y coordinates and update min and max values.
// Start with the first coordinate pair for both (coords.slice(0, 2)).
var min = coords.slice(0, 2), max = min.slice(0);
for (var i = 2; i < 8; i++) {
var c = coords[i], j = i % 2;
if (c < min[j])
min[j] = c;
else if (c > max[j])
max[j] = c;
}
this._bounds.set(min[0], min[1], max[0] - min[0], max[1] - min[1]);
},
getBounds: function() {