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# csGradient Class Reference

A simple color gradient. More...

`#include <csgfx/gradient.h>`

Inheritance diagram for csGradient:

[legend]
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< iGradientShades > | GetShades ()
| 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.

## Protected Attributes

csArray< csGradientShade > | shades
| The entries in this gradient.

## Classes

struct | scfGradientShadesArray

## 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 | ) | `[virtual]`

Add a shade.

Implements iGradient.

void csGradient::Clear | ( |  | ) | `[virtual]`

Clear all shades.

Implements iGradient.

csPtr<iGradientShades> csGradient::GetShades | ( |  | ) | `[virtual]`

Get the array of shades.

Implements iGradient.

bool csGradient::Render | ( | csRGBpixel * | pal,
|  | size_t | count,
|  | float | begin = `0.0f`,
|  | float | end = `1.0f` |
| ) |  |  | const`[virtual]`

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.)

Implements iGradient.

bool csGradient::Render | ( | csRGBcolor * | pal,
|  | size_t | count,
|  | float | begin = `0.0f`,
|  | float | end = `1.0f` |
| ) |  |  | const`[virtual]`

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.)

Implements iGradient.

## Member Data Documentation

csArray<csGradientShade> csGradient::shades `[protected]`

The entries in this gradient.

Definition at line 62 of file gradient.h.

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

- csgfx/gradient.h