From ca2bce5efde0b5b296806df0c426f88d874eb530 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?IOhannes=20m=20zm=C3=B6lnig?=
 <zmoelnig@users.sourceforge.net>
Date: Mon, 13 Mar 2006 15:59:40 +0000
Subject: added the missing files from Gem's MarkEx

svn path=/trunk/externals/markex/; revision=4698
---
 hsv2rgb.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 hsv2rgb.c

(limited to 'hsv2rgb.c')

diff --git a/hsv2rgb.c b/hsv2rgb.c
new file mode 100644
index 0000000..03fc316
--- /dev/null
+++ b/hsv2rgb.c
@@ -0,0 +1,125 @@
+////////////////////////////////////////////////////////
+//
+// GEM - Graphics Environment for Multimedia
+//
+// mark@danks.org
+//
+//    Copyright (c) 1997-1999 Mark Danks.
+//    For information on usage and redistribution, and for a DISCLAIMER OF ALL
+//    WARRANTIES, see the file, "GEM.LICENSE.TERMS" in this distribution.
+//
+/////////////////////////////////////////////////////////
+
+#include "m_pd.h"
+#include <math.h>
+
+inline float FLOAT_CLAMP(float x) { return((x > 1.f) ? 1.f : ( (x < 0.f) ? 0.f : x)); }
+
+/////////////////////////////////////////////////////////
+//
+// hsv2rgb
+//
+/////////////////////////////////////////////////////////
+// instance structure
+static t_class *hsv2rgb_class;
+
+typedef struct _hsv2rgb
+{
+  t_object    x_obj;	        // obligatory object header
+  t_outlet    *t_out1;	    // the outlet
+}t_hsv2rgb;
+
+static void hsv2rgb_float(t_hsv2rgb *x, t_floatarg h, t_floatarg s, t_floatarg v)
+{
+  t_atom argv[3];
+  float r=0, g=0, b=0;
+
+  h = FLOAT_CLAMP(h);
+  s = FLOAT_CLAMP(s);
+  v = FLOAT_CLAMP(v);
+
+  // convert hue to degrees
+  h *= 360.f;
+	
+  if (s == 0.0)		// black and white
+    {
+      r = g = b = v;
+    }
+  else
+    {
+      if (h == 360.0)			// 360 == 0 degrees
+        h = 0.0f;
+      h /= 60.0f;				// hue is now [0, 6]
+      {
+        int i = (int)floor(h);
+        float f = h - i;		// f is the fractional part of h
+        float p = v * (1 - s);
+        float q = v * (1 - s * f);
+        float t = v * (1 - s * (1 - f));
+        
+        switch (i)
+          {
+          case 0:
+            r = v;
+            g = t;
+            b = p;
+            break;
+          case 1:
+            r = q;
+            g = v;
+            b = p;
+            break;
+          case 2:
+            r = p;
+            g = v;
+            b = t;
+            break;
+          case 3:
+            r = p;
+            g = q;
+          b = v;
+          break;
+          case 4:
+            r = t;
+            g = p;
+            b = v;
+            break;
+          case 5:
+            r = v;
+            g = p;
+            b = q;
+            break;
+          }
+      }
+    }
+  SETFLOAT(&argv[0], r);
+  SETFLOAT(&argv[1], g);
+  SETFLOAT(&argv[2], b);
+  outlet_list(x->t_out1, &s_list, 3, argv);
+}
+
+static void hsv2rgb_list(t_hsv2rgb *x, t_symbol *sym, int argc, t_atom *argv)
+{
+  if (argc >= 3)
+    {
+      float h = atom_getfloat(&argv[0]);
+      float s = atom_getfloat(&argv[1]);
+      float v = atom_getfloat(&argv[2]);
+      hsv2rgb_float(x, h, s, v);
+    }
+}
+
+static void *hsv2rgb_new(void)	// init vals in struct
+{
+  t_hsv2rgb *x = (t_hsv2rgb *)pd_new(hsv2rgb_class);
+  x->t_out1 = outlet_new(&x->x_obj, 0);
+  return (x);
+}
+
+void hsv2rgb_setup(void)
+{
+  hsv2rgb_class = class_new(gensym("hsv2rgb"), (t_newmethod)hsv2rgb_new, 0,
+                            sizeof(t_hsv2rgb), CLASS_DEFAULT, A_NULL);
+  class_addlist(hsv2rgb_class, (t_method)hsv2rgb_list);
+}
+
-- 
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