pixel-editor/js/_getCursorPosition.js

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JavaScript
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//get cursor position relative to canvas
function getCursorPosition(e) {
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var x;
var y;
if (e.pageX != undefined && e.pageY != undefined) {
x = e.pageX;
y = e.pageY;
}
else {
x = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
y = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
}
x -= currentLayer.canvas.offsetLeft;
y -= currentLayer.canvas.offsetTop;
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return [Math.round(x), Math.round(y)];
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}