class ColorRGBA

The ColorRGBA class encapsulates a floating-point RGBA color.

class ColorRGBA

ColorRGBA::Set	Sets all four components of a color.
ColorRGBA::GetColorRGB	Returns a reference to a ColorRGB object.

float       red;	The red component.
float       green;	The green component.
float       blue;	The blue component.
float       alpha;	The alpha component.

ColorRGBA();

ColorRGBA(const ColorRGB& c, float a = 1.0F);

ColorRGBA(float r, float g, float b, float a = 1.0F);

The ColorRGBA class encapsulates a color having floating-point red, green, blue, and alpha components in the range [0.0, 1.0]. When a ColorRGB object is converted to a ColorRGBA object, the alpha component is assumed to be 1.0.

The default constructor leaves the components of the color undefined. If the values r, g, b, and a are supplied, then they are assigned to the red, green, blue, and alpha components of the color, respectively.

float& operator [](machine k);	Returns a reference to the k-th component of a color. The value of k must be 0, 1, 2, or 3.
const float& operator [](machine k) const;	Returns a constant reference to the k-th component of a color. The value of k must be 0, 1, 2, or 3.
ColorRGBA& operator =(const ColorRGB& c);	Copies the red, green, and blue components of c, and assigns the alpha component a value of 1.
ColorRGBA& operator =(float s);	Assigns the value s to the red, green, and blue components, and assigns the alpha component a value of 1.
ColorRGBA& operator +=(const ColorRGBA& c);	Adds the color c.
ColorRGBA& operator +=(const ColorRGB& c);	Adds the color c. The alpha component is not modified.
ColorRGBA& operator -=(const ColorRGBA& c);	Subtracts the color c.
ColorRGBA& operator -=(const ColorRGB& c);	Subtracts the color c. The alpha component is not modified.
ColorRGBA& operator *=(const ColorRGBA& c);	Multiplies by the color c.
ColorRGBA& operator *=(const ColorRGB& c);	Multiplies by the color c. The alpha component is not modified.
ColorRGBA& operator *=(float s);	Multiplies all four components by s.
ColorRGBA& operator /=(float s);	Divides all four components by s.

ColorRGBA operator -(const ColorRGBA& c);	Returns the negation of the color c.
ColorRGBA operator +(const ColorRGBA& c1, const ColorRGBA& c2);	Returns the sum of the colors c1 and c2.
ColorRGBA operator +(const ColorRGBA& c1, const ColorRGB& c2);	Returns the sum of the colors c1 and c2. The alpha component of c2 is assumed to be 0.
ColorRGBA operator -(const ColorRGBA& c1, const ColorRGBA& c2);	Returns the difference of the colors c1 and c2.
ColorRGBA operator -(const ColorRGBA& c1, const ColorRGB& c2);	Returns the difference of the colors c1 and c2. The alpha component of c2 is assumed to be 0.
ColorRGBA operator *(const ColorRGBA& c1, const ColorRGBA& c2);	Returns the product of the colors c1 and c2.
ColorRGBA operator *(const ColorRGBA& c1, const ColorRGB& c2);	Returns the product of the colors c1 and c2. The alpha component of c2 is assumed to be 1.
ColorRGBA operator *(const ColorRGB& c1, const ColorRGBA& c2);	Returns the product of the colors c1 and c2. The alpha component of c1 is assumed to be 1.
ColorRGBA operator *(const ColorRGBA& c, float s);	Returns the product of the color c and the scalar s.
ColorRGBA operator *(float s, const ColorRGBA& c);	Returns the product of the color c and the scalar s.
ColorRGBA operator /(const ColorRGBA& c, float s);	Returns the product of the color c and the inverse of the scalar s.
bool operator ==(const ColorRGBA& c1, const ColorRGBA& c2);	Returns a boolean value indicating whether the two colors c1 and c2 are equal.
bool operator ==(const ColorRGBA& c1, const ColorRGB& c2);	Returns a boolean value indicating whether the two colors c1 and c2 are equal. The alpha component of c2 is assumed to be 1.
bool operator !=(const ColorRGBA& c1, const ColorRGBA& c2);	Returns a boolean value indicating whether the two colors c1 and c2 are not equal.
bool operator !=(const ColorRGBA& c1, const ColorRGB& c2);	Returns a boolean value indicating whether the two colors c1 and c2 are not equal. The alpha component of c2 is assumed to be 1.
float Luminance(const ColorRGBA& c);	Returns the luminance value of the color c.

ColorRGB