From 4ddcd9f810fa588ccf90442f7b4e5ddf385e85f2 Mon Sep 17 00:00:00 2001
From: Piotr Dziwinski <piotrdz@gmail.com>
Date: Thu, 26 Jul 2012 22:26:19 +0200
Subject: Change of paths in src/graphics

- moved abstract core to src/graphics/core
- moved proper graphics engine to src/graphics/engine
---
 src/graphics/core/color.cpp | 103 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 src/graphics/core/color.cpp

(limited to 'src/graphics/core/color.cpp')

diff --git a/src/graphics/core/color.cpp b/src/graphics/core/color.cpp
new file mode 100644
index 0000000..8dec0e4
--- /dev/null
+++ b/src/graphics/core/color.cpp
@@ -0,0 +1,103 @@
+// * This file is part of the COLOBOT source code
+// * Copyright (C) 2012, Polish Portal of Colobot (PPC)
+// *
+// * This program is free software: you can redistribute it and/or modify
+// * it under the terms of the GNU General Public License as published by
+// * the Free Software Foundation, either version 3 of the License, or
+// * (at your option) any later version.
+// *
+// * This program is distributed in the hope that it will be useful,
+// * but WITHOUT ANY WARRANTY; without even the implied warranty of
+// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// * GNU General Public License for more details.
+// *
+// * You should have received a copy of the GNU General Public License
+// * along with this program. If not, see  http://www.gnu.org/licenses/.
+
+// color.cpp
+
+#include "graphics/core/color.h"
+
+#include "math/func.h"
+
+
+Gfx::ColorHSV Gfx::RGB2HSV(Gfx::Color color)
+{
+    Gfx::ColorHSV result;
+
+    float min = Math::Min(color.r, color.g, color.b);
+    float max = Math::Max(color.r, color.g, color.b);
+
+    result.v = max;  // intensity
+
+    if ( max == 0.0f )
+    {
+        result.s = 0.0f;  // saturation
+        result.h = 0.0f;  // undefined color!
+    }
+    else
+    {
+        float delta = max-min;
+        result.s = delta/max;  // saturation
+
+        if ( color.r == max )  // between yellow & magenta
+        {
+        result.h = (color.g-color.b)/delta;
+        }
+        else if ( color.g == max )  // between cyan & yellow
+        {
+        result.h = 2.0f+(color.b-color.r)/delta;
+        }
+        else  // between magenta & cyan
+        {
+        result.h = 4.0f+(color.r-color.g)/delta;
+        }
+
+        result.h *= 60.0f;  // in degrees
+        if ( result.h < 0.0f )  result.h += 360.0f;
+        result.h /= 360.0f;  // 0..1
+    }
+
+    return result;
+}
+
+Gfx::Color Gfx::HSV2RGB(Gfx::ColorHSV color)
+{
+    Gfx::Color result;
+
+    color.h = Math::Norm(color.h)*360.0f;
+    color.s = Math::Norm(color.s);
+    color.v = Math::Norm(color.v);
+
+    if ( color.s == 0.0f )  // zero saturation?
+    {
+        result.r = color.v;
+        result.g = color.v;
+        result.b = color.v;  // gray
+    }
+    else
+    {
+        if ( color.h == 360.0f )  color.h = 0.0f;
+        color.h /= 60.0f;
+        int i = (int)color.h;  // integer part (0 .. 5)
+        float f = color.h-i;   // fractional part
+
+        float v = color.v;
+        float p = color.v*(1.0f-color.s);
+        float q = color.v*(1.0f-(color.s*f));
+        float t = color.v*(1.0f-(color.s*(1.0f-f)));
+
+        switch (i)
+        {
+        case 0:  result.r=v; result.g=t; result.b=p;  break;
+        case 1:  result.r=q; result.g=v; result.b=p;  break;
+        case 2:  result.r=p; result.g=v; result.b=t;  break;
+        case 3:  result.r=p; result.g=q; result.b=v;  break;
+        case 4:  result.r=t; result.g=p; result.b=v;  break;
+        case 5:  result.r=v; result.g=p; result.b=q;  break;
+        }
+    }
+
+    return result;
+}
+
-- 
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