31 lines
1.2 KiB
JavaScript
31 lines
1.2 KiB
JavaScript
function changeZoom (layer, direction, cursorLocation) {
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var oldWidth = canvasSize[0] * zoom;
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var oldHeight = canvasSize[1] * zoom;
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var newWidth, newHeight;
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//change zoom level
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//if you want to zoom out, and the zoom isnt already at the smallest level
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if (direction == 'out' && zoom > 1) {
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zoom -= Math.ceil(zoom / 10);
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newWidth = canvasSize[0] * zoom;
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newHeight = canvasSize[1] * zoom;
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//adjust canvas position
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setCanvasOffset(layer.canvas, layer.canvas.offsetLeft + (oldWidth - newWidth) *cursorLocation[0]/oldWidth, layer.canvas.offsetTop + (oldHeight - newHeight) *cursorLocation[1]/oldWidth);
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} else if (direction == 'in' && zoom + Math.ceil(zoom/10) < window.innerHeight/4){
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//if you want to zoom in
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zoom += Math.ceil(zoom/10);
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newWidth = canvasSize[0] * zoom;
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newHeight = canvasSize[1] * zoom;
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//adjust canvas position
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setCanvasOffset(layer.canvas, layer.canvas.offsetLeft - Math.round((newWidth - oldWidth)*cursorLocation[0]/oldWidth), layer.canvas.offsetTop - Math.round((newHeight - oldHeight)*cursorLocation[1]/oldHeight));
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}
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//resize canvas
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layer.resize();
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// adjust brush size
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updateCursor();
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}
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