rAffineTransform(a, b, c, d, e, f [, bgColor [, filter [, blur ]]])

Perform reverse affine transformation on the drawing surface.

A reverse affine transformation is an operation where every pixel is copied from another pixel according to the formula.


where (xDest, yDest) is a destination pixel, and (xSrc, ySrc) is where it should come from.

Many graphics operation, such as translation, rotation, and resizing, can be considered as a special case of reverse affine transformation.

Argument	Default	Description
a	(Mandatory)	The parameter 'a' in the coordinate transformation formula "xSrc = a * xDest + b * yDest + c".
b	(Mandatory)	The parameter 'b' in the coordinate transformation formula "xSrc = a * xDest + b * yDest + c".
c	(Mandatory)	The parameter 'c' in the coordinate transformation formula "xSrc = a * xDest + b * yDest + c".
d	(Mandatory)	The parameter 'd' in the coordinate transformation formula "ySrc = d * xDest + e * yDest + f".
e	(Mandatory)	The parameter 'e' in the coordinate transformation formula "ySrc = d * xDest + e * yDest + f".
f	(Mandatory)	The parameter 'f' in the coordinate transformation formula "ySrc = d * xDest + e * yDest + f".
bgColor	FFFFFF	The background color used to fill destination pixels that are not mapped to any source pixels.
filter	LinearFilter	The filter to use for re-sampling.
blur	1	The blur factor to use for re-sampling.

None