class ColorRGBA

Defined in: C4ColorRGBA.h

The ColoRGBA class encapsulates an RGBA color.

Definition

class ColorRGBA

Member Functions

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

Data Members

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

Constructor

ColorRGBA();

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

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

Description

The ColorRGBA class encapsulates a color having floating-point red, green, blue, and alpha components. When a ColorRGB object is converted to a ColorRGBA object, the alpha component is assumed to be 1.

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.

Overloaded Operators

`float& operator [](long 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 [](long 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 f);`	Assigns the value `f` 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 t);`	Multiplies all four components by `t`.
`ColorRGBA& operator /=(float t);`	Divides all four components by `t`.

Nonmember Operations

`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 t);`	Returns the product of the color `c` and the scalar `t`.
`ColorRGBA operator *(float t, const ColorRGBA& c);`	Returns the product of the color `c` and the scalar `t`.
`ColorRGBA operator /(const ColorRGBA& c, float t);`	Returns the product of the color `c` and the inverse of the scalar `t`.
`bool operator ==(const ColorRGBA& c1, const ColorRGBA& c2);`	Returns a boolean value indicating the equality of the two colors `c1` and `c2`.
`bool operator ==(const ColorRGBA& c1, const ColorRGB& c2);`	Returns a boolean value indicating the equality of the two colors `c1` and `c2`. The alpha component of `c2` is assumed to be 1.
`bool operator !=(const ColorRGBA& c1, const ColorRGBA& c2);`	Returns a boolean value indicating the inequality of the two colors `c1` and `c2`.
`bool operator !=(const ColorRGBA& c1, const ColorRGB& c2);`	Returns a boolean value indicating the inequality of the two colors `c1` and `c2`. The alpha component of `c2` is assumed to be 1.