Added class COLOR4D that contains color representation with 4 components...

Added class COLOR4D that contains color representation with 4 components (RGBA) (for future usage in GAL)

common/gal/color4d.cpp

+/*
+ * This program source code file is part of KICAD, a free EDA CAD application.
+ *
+ * Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
+ * Copyright (C) 2012 Kicad Developers, see change_log.txt for contributors.
+ *
+ * Color class
+ *
+ * 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 2
+ * 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, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include <gal/color4d.h>
+
+using namespace KiGfx;
+
+const bool COLOR4D::operator==( const COLOR4D& aColor )
+{
+    return a == aColor.a && r == aColor.r && g == aColor.g && b == aColor.b;
+}
+
+
+const bool COLOR4D::operator!=( const COLOR4D& aColor )
+{
+    return a != aColor.a || r != aColor.r || g != aColor.g || b != aColor.b;
+}

include/gal/color4d.h

+/*
+ * This program source code file is part of KICAD, a free EDA CAD application.
+ *
+ * Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
+ * Copyright (C) 2012 Kicad Developers, see change_log.txt for contributors.
+ *
+ * Color class
+ *
+ * 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 2
+ * 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, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef COLOR4D_H_
+#define COLOR4D_H_
+
+namespace KiGfx
+{
+/**
+ * Class COLOR4D
+ * is the color representation with 4 components: red, green, blue, alpha.
+ */
+class COLOR4D
+{
+public:
+    // Constructor (creates the Color 0,0,0,0)
+    COLOR4D() :
+        r( 0 ), g( 0 ), b( 0 ), a( 1 )
+    {
+    }
+
+    /**
+     * @brief Constructor
+     *
+     * @param aRed   is the red component   [0.0 .. 1.0].
+     * @param aGreen is the green component [0.0 .. 1.0].
+     * @param aBlue  is the blue component  [0.0 .. 1.0].
+     * @param aAlpha is the alpha value     [0.0 .. 1.0].
+     */
+    COLOR4D( double aRed, double aGreen, double aBlue, double aAlpha ) :
+        r( aRed ), g( aGreen ), b( aBlue ), a( aAlpha )
+    {
+    }
+
+    /**
+     * Function Highlight
+     * Makes the color brighter by a given factor.
+     * @param aFactor Specifies how bright the color should become (valid values: 0.0 .. 1.0).
+     * @return COLOR4D& Brightened color.
+     */
+    COLOR4D& Highlight( double aFactor )
+    {
+        r = (double) r * (1.0 - aFactor) + aFactor;
+        g = (double) g * (1.0 - aFactor) + aFactor;
+        b = (double) b * (1.0 - aFactor) + aFactor;
+
+        return *this;
+    }
+
+    /**
+     * Function Darken
+     * Makes the color darker by a given factor.
+     * @param aFactor Specifies how dark the color should become (valid values: 0.0 .. 1.0).
+     * @return COLOR4D& Darkened color.
+     */
+    COLOR4D& Darken( double aFactor )
+    {
+        r = (double) r * (1.0 - aFactor);
+        g = (double) g * (1.0 - aFactor);
+        b = (double) b * (1.0 - aFactor);
+
+        return *this;
+    }
+
+    /**
+     * Function Highlighted
+     * Returns a color that is brighter by a given factor, without modifying object.
+     * @param aFactor Specifies how bright the color should become (valid values: 0.0 .. 1.0).
+     * @return COLOR4D Highlightedd color.
+     */
+    COLOR4D Highlighted( double aFactor ) const
+    {
+        return COLOR4D( r * (1.0 - aFactor) + aFactor,
+                        g * (1.0 - aFactor) + aFactor,
+                        b * (1.0 - aFactor) + aFactor,
+                        a );
+    }
+
+    /**
+     * Function Darkened
+     * Returns a color that is darker by a given factor, without modifying object.
+     * @param aFactor Specifies how dark the color should become (valid values: 0.0 .. 1.0).
+     * @return COLOR4D Darkened color.
+     */
+    COLOR4D Darkened( double aFactor ) const
+    {
+        return COLOR4D( r * (1.0 - aFactor),
+                        g * (1.0 - aFactor),
+                        b * (1.0 - aFactor),
+                        a );
+    }
+
+    /// @brief Equality operator, are two colors equal
+    const bool operator==( const COLOR4D& aColor );
+
+    /// @brief Not equality operator, are two colors not equal
+    const bool operator!=( const COLOR4D& aColor );
+
+    // Color components: red, green, blue, alpha
+    double r; ///< Red component
+    double g; ///< Green component
+    double b; ///< Blue component
+    double a; ///< Alpha component
+};
+} // namespace KiGfx
+
+#endif /* COLOR4D_H_ */