CrystalSpace

Public API Reference

csGradient Class Reference

A simple color gradient. More...

#include <csgfx/gradient.h>

Inherits scfImplementation1< csGradient, iGradient >.

List of all members.

Public Member Functions

void Clear ()
 Clear all shades.
 csGradient (csColor4 first, csColor4 last)
 Construct with first at position 0 and last at 1.
 csGradient ()
 Construct an empty gradient.
csPtr< iGradientShadesGetShades ()
 Get the array of shades.
bool Render (csRGBpixel *pal, size_t count, float begin=0.0f, float end=1.0f) const
 Interpolate the colors over a part of the gradient.
bool Render (csRGBcolor *pal, size_t count, float begin=0.0f, float end=1.0f) const
 Interpolate the colors over a part of the gradient.

void AddShade (const csGradientShade &shade)
 Add a shade.
void AddShade (const csColor4 &color, float position)
 Add a shade.
void AddShade (const csColor4 &left, const csColor4 &right, float position)
 Add a shade.

Protected Attributes

csArray< csGradientShadeshades
 The entries in this gradient.

Detailed Description

A simple color gradient.

If you ever have worked with an image creation/manipulation program with a slightly higher niveau than Windows Paint then you probably know what this is.

Colors(here called 'shades') can be placed at arbitrary positions; although commonly a range of [0;1] is used, negative positions and positions larger than 1 are supported.

Shades contain actually two colors, a 'left' and 'right' one. You can think of this as, when approaching from one side, you'll get closer and closer to the respective color. If you step over a shade, you have the other color, but you're getting farther and farther from it (and towards the next color) when moving on. This feature can be used for sharp transitions; for smooth ones they are simply set to the same value.

For some examples see the iGradient documentation.

Definition at line 57 of file gradient.h.


Constructor & Destructor Documentation

csGradient::csGradient (  ) 

Construct an empty gradient.

csGradient::csGradient ( csColor4  first,
csColor4  last 
)

Construct with first at position 0 and last at 1.


Member Function Documentation

void csGradient::AddShade ( const csGradientShade shade  ) 

Add a shade.

Add a shade

void csGradient::AddShade ( const csColor4 color,
float  position 
)

Add a shade.

Add a shade

void csGradient::AddShade ( const csColor4 left,
const csColor4 right,
float  position 
)

Add a shade.

Add a shade

void csGradient::Clear (  ) 

Clear all shades.

csPtr<iGradientShades> csGradient::GetShades (  ) 

Get the array of shades.

bool csGradient::Render ( csRGBpixel pal,
size_t  count,
float  begin = 0.0f,
float  end = 1.0f 
) const

Interpolate the colors over a part of the gradient.

Parameters:
pal Array of csRGBpixel the gradient should be rendered to.
count Number of palette entries to render.
begin Start position. Can be anywhere in the gradient.
end End position. Can be anywhere in the gradient.
Remarks:
At least 1 shade has to be present in the gradient to have this function succeed.
Makes heavy use of floating point calculations, so you might want to use this function in a precalc phase.
begin doesn't have to be smaller than end.
begin and end can both lie completely 'outside' the gradient (i.e. both smaller/large than the first resp. last shade's position.)
bool csGradient::Render ( csRGBcolor pal,
size_t  count,
float  begin = 0.0f,
float  end = 1.0f 
) const

Interpolate the colors over a part of the gradient.

Parameters:
pal Array of csRGBcolor the gradient should be rendered to.
count Number of palette entries to render.
begin Start position. Can be anywhere in the gradient.
end End position. Can be anywhere in the gradient.
Remarks:
At least 1 shade has to be present in the gradient to have this function succeed.
Makes heavy use of floating point calculations, so you might want to use this function in a precalc phase.
begin doesn't have to be smaller than end.
begin and end can both lie completely 'outside' the gradient (i.e. both smaller/large than the first resp. last shade's position.)

Member Data Documentation

The entries in this gradient.

Definition at line 62 of file gradient.h.


The documentation for this class was generated from the following file:

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