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Make rgb rainbow match xterm palette more closely

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jaseg 2020-12-25 14:47:15 +01:00
parent 2f5d7ab8c0
commit e6d4480145
1 changed files with 9 additions and 5 deletions
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14
lolcat.c
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@ -140,8 +140,6 @@ int main(int argc, char** argv)
}
}
if (rgb)
freq_h /= 10;
int rand_offset = 0;
if (random) {
srand(time(NULL));
@ -191,12 +189,18 @@ int main(int argc, char** argv)
if (c == '\n') {
l++;
i = 0;
} else {
if (rgb) {
uint8_t red = sin(((i += wcwidth(c)) * freq_h + l * freq_v) + 0 ) * 127 + 128;
uint8_t green = sin(((i += wcwidth(c)) * freq_h + l * freq_v) + 2 * M_PI / 3 ) * 127 + 128;
uint8_t blue = sin(((i += wcwidth(c)) * freq_h + l * freq_v) + 4 * M_PI / 3 ) * 127 + 128;
i += wcwidth(c);
float theta = i * freq_h / 5.0f + l * freq_v;
float offset = 0.1;
uint8_t red = lrintf((offset + (1.0f - offset) * (0.5f + 0.5f * sin(theta + 0 ))) * 255.0f);
uint8_t green = lrintf((offset + (1.0f - offset) * (0.5f + 0.5f * sin(theta + 2 * M_PI / 3 ))) * 255.0f);
uint8_t blue = lrintf((offset + (1.0f - offset) * (0.5f + 0.5f * sin(theta + 4 * M_PI / 3 ))) * 255.0f);
wprintf(L"\033[38;2;%d;%d;%dm", red, green, blue);
} else {
int ncc = offx * ARRAY_SIZE(codes) + (int)((i += wcwidth(c)) * freq_h + l * freq_v);
if (cc != ncc)