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fix #2517
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@ -80,8 +80,6 @@ class CanvasDrawer extends OpenSeadragon.DrawerBase{
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// Canvas default is "true", so this will only be changed if user specifies "false" in the options or via setImageSmoothinEnabled.
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this._imageSmoothingEnabled = true;
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this._viewportFlipped = false;
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// Since the tile-drawn and tile-drawing events are fired by this drawer, make sure handlers can be added for them
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this.viewer.allowEventHandler("tile-drawn");
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this.viewer.allowEventHandler("tile-drawing");
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@ -118,8 +116,8 @@ class CanvasDrawer extends OpenSeadragon.DrawerBase{
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this._prepareNewFrame(); // prepare to draw a new frame
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if(this.viewer.viewport.getFlip() !== this._viewportFlipped){
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this._flip();
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this._viewportFlipped = !this._viewportFlipped;
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}
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console.log('draw', this._viewportFlipped);
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for(const tiledImage of tiledImages){
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if (tiledImage.opacity !== 0) {
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this._drawTiles(tiledImage);
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@ -189,6 +187,10 @@ class CanvasDrawer extends OpenSeadragon.DrawerBase{
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context.restore();
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}
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get _viewportFlipped(){
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return this.context.getTransform().a < 0;
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}
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/**
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* Fires the tile-drawing event.
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* @private
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@ -961,6 +963,7 @@ class CanvasDrawer extends OpenSeadragon.DrawerBase{
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context.translate(point.x, 0);
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context.scale(-1, 1);
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context.translate(-point.x, 0);
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console.log('flipped');
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}
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// private
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