From 9d3f2a4fab683a86b69d8cc63e8f08bc27481623 Mon Sep 17 00:00:00 2001
From: div0 <div0@f962a42d-fe04-0410-a3ab-8c8b0445ebaa>
Date: Fri, 26 Dec 2008 14:25:58 +0000
Subject: [PATCH] hsl color space generator script

git-svn-id: svn://svn.icculus.org/nexuiz/trunk@5312 f962a42d-fe04-0410-a3ab-8c8b0445ebaa
---
 misc/demotc.pl  |   9 ++++-
 misc/hslimage.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 112 insertions(+), 1 deletion(-)
 create mode 100644 misc/hslimage.c

diff --git a/misc/demotc.pl b/misc/demotc.pl
index b95191ece..c3e072db3 100755
--- a/misc/demotc.pl
+++ b/misc/demotc.pl
@@ -141,7 +141,14 @@ for(;;)
 	{
 		if(my @l = ($data =~ /$pattern/))
 		{
-			print "$tc:";
+			if(defined $tc)
+			{
+				print "$tc:";
+			}
+			else
+			{
+				print "start:";
+			}
 			for(@l)
 			{
 				print " \"", sanitize($_), "\"";
diff --git a/misc/hslimage.c b/misc/hslimage.c
new file mode 100644
index 000000000..900644724
--- /dev/null
+++ b/misc/hslimage.c
@@ -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;
+}
-- 
2.39.2