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Determine the transformation matrix for the reflection about the line y = x.
Solution: The transformation for mirror reflection regarding to the line y = x, comprises the subsequent three basic transformations.
1) Rotate the line L via 45o in clockwise rotation,
2) Perform the needed Reflection about the x-axis.
3) Rotate back the line L via -45o that is,
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when dda algorithm is more efficient than bresenhem line drawing algorithm
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