Color.h

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#ifndef COLOR_H_
#define COLOR_H_

class Color {
        public:
                typedef unsigned char ColorUnit;
                static const ColorUnit maxChannelValue = 255;

                Color(ColorUnit R, ColorUnit G, ColorUnit B, ColorUnit A = maxChannelValue) :
                        mR(R), mG(G), mB(B), mA(A) {}

                void set(ColorUnit R, ColorUnit G, ColorUnit B, ColorUnit A) {
                        mR = R;
                        mG = G;
                        mB = B;
                        mA = A;
                }

                ColorUnit R() const { return mR; }
                ColorUnit G() const { return mG; }
                ColorUnit B() const { return mB; }
                ColorUnit A() const { return mA; }

                void setR(ColorUnit r) {mR = r;}
                void setG(ColorUnit g) {mG = g;}
                void setB(ColorUnit b) {mB = b;}
                void setA(ColorUnit a) {mA = a;}

                Color operator *=(float v) {
                //precondition: 0 <= v <= 1
                        mR = ColorUnit( mR * v);
                        mG = ColorUnit( mG * v);
                        mB = ColorUnit( mB * v);
                        mA = ColorUnit( mA * v);
                        return *this;
                }

                Color operator*(float v) const {
                //precondition: 0 <= v <= 1
                        Color r(*this);
                        return r *= v;
                }

                bool opaque() const { return mA == maxChannelValue; }

        private:
                ColorUnit mR, mG, mB, mA;
};

#endif

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