cos8()

LIB8STATIC uint8_t cos8

(

uint8_t

theta

)

Fast 8-bit approximation of cos(x).

This approximation never varies more than 2% from the floating point value you'd get by doing

float s = (cos(x) * 128.0) + 128;

Parameters

theta

input angle from 0-255

Returns

cos of theta, value between 0 and 255

Definition at line 271 of file trig8.h.

{ return sin8(theta + 64); }

References LIB8STATIC, and sin8.

Referenced by getPaletteIndex().

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