constructor(values){
        if(!values) {
            values = [
                0, 0, 0,
                0, 0, 0,
                0, 0, 0
            ];
        }
        this.values = values;
    }
@class Mat3
@classdesc A left-to-right matrix representation, useful for affine transforms for
positioning tiles for drawing

@memberof OpenSeadragon

@param {Array} [values] - Initial values for the matrix