constructor(a11 /*float*/, a21 /*float*/, a31 /*float*/, a12 /*float*/, a22 /*float*/, a32 /*float*/, a13 /*float*/, a23 /*float*/, a33 /*float*/) {
			this.a11 = a11;
			this.a21 = a21;
			this.a31 = a31;
			this.a12 = a12;
			this.a22 = a22;
			this.a32 = a32;
			this.a13 = a13;
			this.a23 = a23;
			this.a33 = a33;
		}
<p>This class implements a perspective transform in two dimensions. Given four source and four
destination points, it will compute the transformation implied between them. The code is based
directly upon section 3.4.2 of George Wolberg's "Digital Image Warping"; see pages 54-56.</p>

@author Sean Owen