transformにmatrixかけた要素のクリック座標取得

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// 
var x = e.offsetX, y = e.offsetY;
if ( 'offsetX' in e !== true ) {
    x = e.layerX - e.currentTarget.offsetLeft;
    y = e.layerY - e.currentTarget.offsetTop;
    if( this.style.transform!=="" ) {
        var p = { x: x, y: y };
        var val = this.style.transform;
        var matrix = [];
        val.split(",").forEach(function(value){ matrix.push( parseFloat(value) ); });
        x = p.x*matrix[0] + p.y*matrix[2] + 1*matrix[4];
        y = p.x*matrix[1] + p.y*matrix[3] + 1*matrix[5];
    }
}
console.log( x, y );