mirror of
https://gitlab.com/xonotic/xonotic
synced 2024-12-16 11:55:20 +00:00
105 lines
2.1 KiB
C
105 lines
2.1 KiB
C
#include <math.h>
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#include <stdio.h>
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#define MARGIN_X 0
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#define MARGIN_Y 0
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void hsl_to_rgb(float hsl_x, float hsl_y, float hsl_z, float *rgb_x, float *rgb_y, float *rgb_z)
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{
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float mi, ma, maminusmi, h;
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if(hsl_z <= 0.5)
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maminusmi = hsl_y * 2 * hsl_z;
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else
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maminusmi = hsl_y * (2 - 2 * hsl_z);
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// hsl_z = 0.5 * mi + 0.5 * ma
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// maminusmi = - mi + ma
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mi = hsl_z - 0.5 * maminusmi;
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ma = hsl_z + 0.5 * maminusmi;
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h = hsl_x - 6 * floor(hsl_x / 6);
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//else if(ma == rgb_x)
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// h = 60 * (rgb_y - rgb_z) / (ma - mi);
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if(h <= 1)
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{
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*rgb_x = ma;
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*rgb_y = h * (ma - mi) + mi;
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*rgb_z = mi;
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}
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//else if(ma == rgb_y)
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// h = 60 * (rgb_z - rgb_x) / (ma - mi) + 120;
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else if(h <= 2)
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{
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*rgb_x = (2 - h) * (ma - mi) + mi;
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*rgb_y = ma;
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*rgb_z = mi;
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}
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else if(h <= 3)
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{
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*rgb_x = mi;
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*rgb_y = ma;
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*rgb_z = (h - 2) * (ma - mi) + mi;
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}
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//else // if(ma == rgb_z)
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// h = 60 * (rgb_x - rgb_y) / (ma - mi) + 240;
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else if(h <= 4)
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{
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*rgb_x = mi;
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*rgb_y = (4 - h) * (ma - mi) + mi;
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*rgb_z = ma;
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}
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else if(h <= 5)
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{
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*rgb_x = (h - 4) * (ma - mi) + mi;
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*rgb_y = mi;
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*rgb_z = ma;
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}
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//else if(ma == rgb_x)
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// h = 60 * (rgb_y - rgb_z) / (ma - mi);
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else // if(h <= 6)
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{
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*rgb_x = ma;
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*rgb_y = mi;
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*rgb_z = (6 - h) * (ma - mi) + mi;
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}
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}
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void hslimage_color(float v_x, float v_y, float margin_x, float margin_y, float *rgb_x, float *rgb_y, float *rgb_z)
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{
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v_x = (v_x - margin_x) / (1 - 2 * margin_x);
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v_y = (v_y - margin_y) / (1 - 2 * margin_y);
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if(v_x < 0) v_x = 0;
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if(v_y < 0) v_y = 0;
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if(v_x > 1) v_x = 1;
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if(v_y > 1) v_y = 1;
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if(v_y > 0.875) // grey bar
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hsl_to_rgb(0, 0, v_x, rgb_x, rgb_y, rgb_z);
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else
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hsl_to_rgb(v_x * 6, 1, (v_y / 0.875), rgb_x, rgb_y, rgb_z);
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}
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int main()
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{
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int x, y;
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float r, g, b;
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for(y = 0; y < 512; ++y)
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{
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for(x = 0; x < 512; ++x)
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{
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hslimage_color(x / 512.0, y / 512.0, MARGIN_X, MARGIN_Y, &r, &g, &b);
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/*
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putc(floor(r * 15 + 0.5) * 17, stdout);
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putc(floor(g * 15 + 0.5) * 17, stdout);
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putc(floor(b * 15 + 0.5) * 17, stdout);
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*/
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putc(floor(r * 255 + 0.5), stdout);
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putc(floor(g * 255 + 0.5), stdout);
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putc(floor(b * 255 + 0.5), stdout);
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}
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}
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return 0;
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}
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