Package com.intellij.util.ui

Class RegionPainter.Alpha

java.lang.Object

com.intellij.util.ui.RegionPainter.Alpha

All Implemented Interfaces:

RegionPainter<java.lang.Float>

Enclosing interface:

RegionPainter<T>

public abstract static class RegionPainter.Alpha
extends java.lang.Object
implements RegionPainter<java.lang.Float>

This class provides a base functionality to paint a region with the specified alpha.

Nested Class Summary

Nested classes/interfaces inherited from interface com.intellij.util.ui.RegionPainter

RegionPainter.Alpha, RegionPainter.Image

Constructor Summary

Constructors

Constructor and Description
Alpha()

Method Summary

Modifier and Type	Method and Description
protected float	getAlpha(java.lang.Float value) Calculates alpha from the specified value.
protected java.awt.Composite	getComposite(float alpha) Returns new composite with the specified alpha.
protected abstract void	paint(java.awt.Graphics2D g, int x, int y, int width, int height) Renders to the given Graphics2D object.
void	paint(java.awt.Graphics2D g, int x, int y, int width, int height, java.lang.Float value) Renders to the given Graphics2D object.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Alpha

public Alpha()

Method Detail

paint

public void paint(java.awt.Graphics2D g,
                  int x,
                  int y,
                  int width,
                  int height,
                  java.lang.Float value)

Description copied from interface: RegionPainter

Renders to the given Graphics2D object.

Specified by:

paint in interface RegionPainter<java.lang.Float>

Parameters:

g - the Graphics2D object to render to

x - X position of the area to paint

y - Y position of the area to paint

width - width of the area to paint

height - height of the area to paint

value - an optional configuration parameter

getAlpha

protected float getAlpha(java.lang.Float value)

Calculates alpha from the specified value.

Parameters:

value - a configuration parameter used to calculate alpha

Returns:

an alpha calculated from the specified value

getComposite

protected java.awt.Composite getComposite(float alpha)

Returns new composite with the specified alpha.

Parameters:

alpha - the constant alpha to be multiplied with the alpha of the source

Returns:

new composite with the specified alpha

paint

protected abstract void paint(java.awt.Graphics2D g,
                              int x,
                              int y,
                              int width,
                              int height)

Renders to the given Graphics2D object.

Parameters:

g - the Graphics2D object to render to

x - X position of the area to paint

y - Y position of the area to paint

width - width of the area to paint

height - height of the area to paint