Reflection
Some applications provide features that reflect (or mirror) objects drawn in
the client area. If your application features reflection capabilities, use the
SetWorldTransform function to set the appropriate values in the world-space to page-space
transformation. This function receives a pointer to an
XFORM structure containing the appropriate values. The
eM11 and
eM22 members of
XFORM specify the horizontal and vertical reflection components, respectively.
The
reflection transformation creates a "mirror" image of an object with respect to either
the x- or y-axis. In short, reflection is just negative scaling. To produce a
horizontal reflection, x-coordinates are multiplied by
1. To produce a vertical reflection, y-coordinates are multiplied by
1.
Horizontal reflection can be represented by the following algorithm:
x' =
x
where
x is the x-coordinate and
x' is the result of the reflection.
The 2-by-2 matrix that produced horizontal reflection contains the following
values:
|-1 0|
|0 1|
Vertical reflection can be represented by the following algorithm:
y' = -y
where
y is the y-coordinate and
y' is the result of the reflection.
The 2-by-2 matrix that produced vertical reflection contains the following
values:
|1 0|
|0 -1|
The horizontal-reflection and vertical-reflection operations can be combined
into a single operation by using the following 2-by-2 matrix:
|-1 0|
|0 -1|
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