A fast and easily customised operating system
for ARM devices
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Transformation Examples
Programmer's Reference Manuals
Transformation Examples
Notes
Rotation can be performed by using:
a = cos(angle)
b = sin(angle)
c = sin(angle)
d = cos(angle)
Scaling can be performed by using:
a = scale
b = 0
c = 0
d = scale
Translation can be performed by using:
e = x translation
f = y translation
So to render a non-rotated 1:1 Draw file at (x,y)1 , the transformation matrix is:
| 1 << 16 | 0 | 0 |
| 0 | 1 << 16 | 0 |
| 256x | 256y | 1 |
And thus:
| a = 1 << 16 | b = 0 |
| c = 0 | d = 1 << 16 |
| e = 256x | f = 256y |