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getMousePos = function(event) {
    var rect = this.canvasElement.getBoundingClientRect();
    var mouseX = isTouched ? event.touches[0].pageX : event.clientX,
        mouseY = isTouched ? event.touches[0].pageY : event.clientY;

    return {
        x: mouseX - rect.left,
        y: mouseY - rect.top
    };
}