r5312 - trunk/misc
DONOTREPLY at icculus.org
DONOTREPLY at icculus.org
Fri Dec 26 09:25:58 EST 2008
Author: div0
Date: 2008-12-26 09:25:58 -0500 (Fri, 26 Dec 2008)
New Revision: 5312
Added:
trunk/misc/hslimage.c
Modified:
trunk/misc/demotc.pl
Log:
hsl color space generator script
Modified: trunk/misc/demotc.pl
===================================================================
--- trunk/misc/demotc.pl 2008-12-25 22:28:47 UTC (rev 5311)
+++ trunk/misc/demotc.pl 2008-12-26 14:25:58 UTC (rev 5312)
@@ -141,7 +141,14 @@
{
if(my @l = ($data =~ /$pattern/))
{
- print "$tc:";
+ if(defined $tc)
+ {
+ print "$tc:";
+ }
+ else
+ {
+ print "start:";
+ }
for(@l)
{
print " \"", sanitize($_), "\"";
Added: trunk/misc/hslimage.c
===================================================================
--- trunk/misc/hslimage.c (rev 0)
+++ trunk/misc/hslimage.c 2008-12-26 14:25:58 UTC (rev 5312)
@@ -0,0 +1,104 @@
+#include <math.h>
+#include <stdio.h>
+
+#define MARGIN_X 0
+#define MARGIN_Y 0
+
+void hsl_to_rgb(float hsl_x, float hsl_y, float hsl_z, float *rgb_x, float *rgb_y, float *rgb_z)
+{
+ float mi, ma, maminusmi, h;
+
+ if(hsl_z <= 0.5)
+ maminusmi = hsl_y * 2 * hsl_z;
+ else
+ maminusmi = hsl_y * (2 - 2 * hsl_z);
+
+ // hsl_z = 0.5 * mi + 0.5 * ma
+ // maminusmi = - mi + ma
+ mi = hsl_z - 0.5 * maminusmi;
+ ma = hsl_z + 0.5 * maminusmi;
+
+ h = hsl_x - 6 * floor(hsl_x / 6);
+
+ //else if(ma == rgb_x)
+ // h = 60 * (rgb_y - rgb_z) / (ma - mi);
+ if(h <= 1)
+ {
+ *rgb_x = ma;
+ *rgb_y = h * (ma - mi) + mi;
+ *rgb_z = mi;
+ }
+ //else if(ma == rgb_y)
+ // h = 60 * (rgb_z - rgb_x) / (ma - mi) + 120;
+ else if(h <= 2)
+ {
+ *rgb_x = (2 - h) * (ma - mi) + mi;
+ *rgb_y = ma;
+ *rgb_z = mi;
+ }
+ else if(h <= 3)
+ {
+ *rgb_x = mi;
+ *rgb_y = ma;
+ *rgb_z = (h - 2) * (ma - mi) + mi;
+ }
+ //else // if(ma == rgb_z)
+ // h = 60 * (rgb_x - rgb_y) / (ma - mi) + 240;
+ else if(h <= 4)
+ {
+ *rgb_x = mi;
+ *rgb_y = (4 - h) * (ma - mi) + mi;
+ *rgb_z = ma;
+ }
+ else if(h <= 5)
+ {
+ *rgb_x = (h - 4) * (ma - mi) + mi;
+ *rgb_y = mi;
+ *rgb_z = ma;
+ }
+ //else if(ma == rgb_x)
+ // h = 60 * (rgb_y - rgb_z) / (ma - mi);
+ else // if(h <= 6)
+ {
+ *rgb_x = ma;
+ *rgb_y = mi;
+ *rgb_z = (6 - h) * (ma - mi) + mi;
+ }
+}
+
+void hslimage_color(float v_x, float v_y, float margin_x, float margin_y, float *rgb_x, float *rgb_y, float *rgb_z)
+{
+ v_x = (v_x - margin_x) / (1 - 2 * margin_x);
+ v_y = (v_y - margin_y) / (1 - 2 * margin_y);
+ if(v_x < 0) v_x = 0;
+ if(v_y < 0) v_y = 0;
+ if(v_x > 1) v_x = 1;
+ if(v_y > 1) v_y = 1;
+ if(v_y > 0.875) // grey bar
+ hsl_to_rgb(0, 0, v_x, rgb_x, rgb_y, rgb_z);
+ else
+ hsl_to_rgb(v_x * 6, 1, (v_y / 0.875), rgb_x, rgb_y, rgb_z);
+}
+
+int main()
+{
+ int x, y;
+ float r, g, b;
+
+ for(y = 0; y < 512; ++y)
+ {
+ for(x = 0; x < 512; ++x)
+ {
+ hslimage_color(x / 512.0, y / 512.0, MARGIN_X, MARGIN_Y, &r, &g, &b);
+ /*
+ putc(floor(r * 15 + 0.5) * 17, stdout);
+ putc(floor(g * 15 + 0.5) * 17, stdout);
+ putc(floor(b * 15 + 0.5) * 17, stdout);
+ */
+ putc(floor(r * 255 + 0.5), stdout);
+ putc(floor(g * 255 + 0.5), stdout);
+ putc(floor(b * 255 + 0.5), stdout);
+ }
+ }
+ return 0;
+}
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