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Spirals, Pinwheels, and Documentation....Oh My! RGB Matrix Effects (#5877)

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* Spirals, Pinwheels, and Documentation....Oh My!

* Spiral effect band thickness adjustments

* Fixing animation spin directions
This commit is contained in:
XScorpion2 2019-05-19 11:19:46 -05:00 • committed by Drashna Jaelre
parent a0d6c5a113
commit 270b39b2eb
9 changed files with 178 additions and 0 deletions
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25
lib/lib8tion/trig8.h
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@ -255,5 +255,30 @@ LIB8STATIC uint8_t cos8( uint8_t theta)
return sin8( theta + 64);
}
/// Fast 16-bit approximation of atan2(x).
/// @returns atan2, value between 0 and 255
LIB8STATIC uint8_t atan2_8(int16_t dy, int16_t dx)
{
if (dy == 0)
{
if (dx >= 0)
return 0;
else
return 128;
}
int16_t abs_y = dy > 0 ? dy : -dy;
int8_t a;
if (dx >= 0)
a = 32 - (32 * (dx - abs_y) / (dx + abs_y));
else
a = 96 - (32 * (dx + abs_y) / (abs_y - dx));
if (dy < 0)
return -a; // negate if in quad III or IV
return a;
}
///@}
#endif