ColorData.h

//
//  ColorData.h
//  Originally created by the CSci-3081W TAs.
//

#ifndef COLORDATA_H
#define COLORDATA_H

/** This color data class stores color in floating point format.
    The Red, Green, Blue, and Alpha channels range from 0.0 to 1.0. */
class ColorData
{
public:
	ColorData();
	ColorData(float r, float g, float b );
	ColorData(float r, float g, float b, float a);

	void setRed(float r);
	void setBlue(float b);
	void setGreen(float g);
	void setAlpha(float a);

	float getRed() const;
	float getBlue() const;
	float getGreen() const;
	float getAlpha() const;

	// Returns the "brightness" of the color according to a perceptual metric that
	// weights the red, green, and blue components of the color non-uniformly.
	float getLuminance() const;

	// Return a clamped version of this ColorData
	ColorData clampedColor() const;

	// Arithmatic operators (friends so that non-member functions can access private variables)
	friend ColorData operator* (const ColorData& a, float f);
	friend ColorData operator+ (const ColorData& a, const ColorData& b);
	friend ColorData operator- (const ColorData& a, const ColorData& b);

private:

	// General helper function for clamping values between 0 and 1
	static inline float clampValue(float input, float a, float b)
	{return input < a ? a : (input > b ? b : input);}

	float m_red;
	float m_green;
	float m_blue;
	float m_alpha;
};

#endif