Combined World-to-Page Space Transformations

You can combine the five world-to-page transformations into a single 3-by-3 matrix. The CombineTransform function can be used to combine two world-space to page-space transformations. You can use the combined transformations to alter output associated with a particular device context (DC) by calling the SetWorldTransform function and supplying the elements for this matrix. When an application calls SetWorldTransform, it stores the elements of the 3-by-3 matrix in an XFORM structure. The members of this structure correspond to the first two columns of a 3-by-3 matrix; the last column of the matrix is not required because its values are constant.

You can retrieve the elements of the current world transformation matrix by calling the GetWorldTransform function and supplying a pointer to an XFORM structure.

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