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Only use a larger sketch canvas if the viewport get rotated.

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This commit is contained in:
Antoine Vandecreme 2016-01-26 12:04:34 -05:00
parent 33021ac24f
commit 43bb0d7741
1 changed files with 18 additions and 0 deletions
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18
src/drawer.js
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@ -317,6 +317,19 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
this.sketchCanvas.width = sketchCanvasSize.x;
this.sketchCanvas.height = sketchCanvasSize.y;
this.sketchContext = this.sketchCanvas.getContext( "2d" );
// If the viewport is not currently rotated, the sketchCanvas
// will have the same size as the main canvas. However, if
// the viewport get rotated later on, we will need to resize it.
if (this.viewport.getRotation() === 0) {
var _this = this;
this.viewer.addHandler('rotate', function resizeSketchCanvas() {
_this.viewer.removeHandler('rotate', resizeSketchCanvas);
var sketchCanvasSize = _this._calculateSketchCanvasSize();
_this.sketchCanvas.width = sketchCanvasSize.x;
_this.sketchCanvas.height = sketchCanvasSize.y;
});
}
}
context = this.sketchContext;
}
@ -555,6 +568,11 @@ $.Drawer.prototype = /** @lends OpenSeadragon.Drawer.prototype */{
// private
_calculateSketchCanvasSize: function() {
var canvasSize = this._calculateCanvasSize();
if (this.viewport.getRotation() === 0) {
return canvasSize;
}
// If the viewport is rotated, we need a larger sketch canvas in order
// to support edge smoothing.
var sketchCanvasSize = Math.ceil(Math.sqrt(
canvasSize.x * canvasSize.x +
canvasSize.y * canvasSize.y));