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Fix compute_gradient_color

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This commit is contained in:
Fred Sundvik 2016-05-11 22:06:26 +03:00
parent f0c8e7c495
commit 25382cb6f2
1 changed files with 5 additions and 2 deletions
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7
led_test.c
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@ -86,10 +86,13 @@ static uint8_t crossfade_start_frame[NUM_ROWS][NUM_COLS];
static uint8_t crossfade_end_frame[NUM_ROWS][NUM_COLS]; static uint8_t crossfade_end_frame[NUM_ROWS][NUM_COLS];
static uint8_t compute_gradient_color(float t, float index, float num) { static uint8_t compute_gradient_color(float t, float index, float num) {
float d = fabs(index - t); const float target = t * (num - 1.0f);
if (d > num / 2.0f) { const float half_num = num / 2.0f;
float d = fabs(index - target);
if (d > half_num) {
d = num - d; d = num - d;
} }
d = 1.0f - (d / half_num);
return (uint8_t)(255.0f * d); return (uint8_t)(255.0f * d);
} }