JGE/src/hge/hgecolor.cpp

@@ -0,0 +1,89 @@
+/*
+** Haaf's Game Engine 1.7
+** Copyright (C) 2003-2007, Relish Games
+** hge.relishgames.com
+**
+** hgeColor*** helper classes implementation
+*/
+
+
+#include "../../include/hge/hgecolor.h"
+#include <math.h>
+
+#ifndef min
+	#define min(x, y) ((x<y)?x:y)
+#endif
+
+#ifndef max
+	#define max(x, y) ((x>y)?x:y)
+#endif
+
+void hgeColorHSV::SetHWColor(DWORD col)
+{
+	float r, g, b;
+	float minv, maxv, delta;
+	float del_R, del_G, del_B;
+
+	a = (col>>24) / 255.0f;
+	r = ((col>>16) & 0xFF) / 255.0f;
+	g = ((col>>8)  & 0xFF) / 255.0f;
+	b = (col       & 0xFF) / 255.0f;
+
+	minv = min(min(r, g), b);
+	maxv = max(max(r, g), b);
+	delta = maxv - minv;
+
+	v = maxv;
+
+	if (delta == 0)
+	{
+		h = 0;
+		s = 0;
+	}
+	else
+	{
+		s = delta / maxv;
+		del_R = (((maxv - r) / 6) + (delta / 2)) / delta;
+		del_G = (((maxv - g) / 6) + (delta / 2)) / delta;
+		del_B = (((maxv - b) / 6) + (delta / 2)) / delta;
+
+		if      (r == maxv) {h = del_B - del_G;}
+		else if (g == maxv) {h = (1 / 3) + del_R - del_B;}
+		else if (b == maxv) {h = (2 / 3) + del_G - del_R;}
+		
+		if (h < 0) h += 1;
+		if (h > 1) h -= 1;
+	}
+}
+
+DWORD hgeColorHSV::GetHWColor() const
+{
+	float r, g, b;
+	float xh, i, p1, p2, p3;
+
+	if (s == 0)
+	{
+		r = v;
+		g = v;
+		b = v;
+	}
+	else
+	{
+		xh = h * 6;
+		if(xh == 6) xh=0;
+		i = floorf(xh);
+		p1 = v * (1 - s);
+		p2 = v * (1 - s * (xh - i));
+		p3 = v * (1 - s * (1 - (xh - i)));
+
+		if      (i == 0) {r = v;  g = p3; b = p1;}
+		else if (i == 1) {r = p2; g = v;  b = p1;}
+		else if (i == 2) {r = p1; g = v;  b = p3;}
+		else if (i == 3) {r = p1; g = p2; b = v; }
+		else if (i == 4) {r = p3; g = p1; b = v; }
+		else			 {r = v;  g = p1; b = p2;}
+	}
+
+	return (ARGB((int)(a*255.0f), (int)(r*255.0f), (int)(g*255.0f), (int)(b*255.0f)));
+}
+