Direction

[Lord Vayaa]

Jeśli ktos sie zna na allegro to niech powie jak to obrocic powiedzmy o 90stopni

masked_blit( ludek1, bufor, 0,0, ludek_x, ludek_y, ludek1->w, ludek1->h);

[Yoda]

The fixed point square root, sin, cos, tan, inverse sin, and inverse cos functions are implemented using lookup tables, which are very fast but not particularly accurate. At the moment the inverse tan uses an iterative search on the tan table, so it is a lot slower than the others.

 

Angles are represented in a binary format with 256 equal to a full circle, 64 being a right angle and so on. This has the advantage that a simple bitwise 'and' can be used to keep the angle within the range zero to a full circle, eliminating all those tiresome 'if (angle >= 360)' checks.

 

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