ShaderType2.Type2PaintContext

java.lang.Object

org.openpdf.renderer.pattern.ShaderType2.Type2PaintContext

All Implemented Interfaces:: PaintContext

Enclosing class:: ShaderType2

class ShaderType2.Type2PaintContext extends Object implements PaintContext

A simple paint context that uses an existing raster in device space to generate pixels

Field Summary

Fields

Modifier and Type

Field

Description

private ColorModel

colorModel

the color model

private float

dt1t0

private double

dx1x0

private double

dy1y0

private Point2D

end

the end of the axis

private double

sqdx1x0psqdy1y0

private Point2D

start

the start of the axis
Constructor Summary

Constructors

Constructor

Description

Type2PaintContext(ColorModel colorModel, Point2D start, Point2D end)

Create a paint context
Method Summary

Modifier and Type

Method

Description

void

dispose()

ColorModel

getColorModel()

Raster

getRaster(int x, int y, int w, int h)

private float

getT(float xp)

t = t0 + (t1 - t0) x x'

private float

getXPrime(float x, float y, float x0, float y0)

x' = (x1 - x0) * (x - x0) + (y1 - y0) * (y - y0) ------------------------------------------- (x1 - x0)^2 + (y1 - y0)^2

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details
- colorModel
  
  private ColorModel colorModel
  
  the color model
- start
  
  private Point2D start
  
  the start of the axis
- end
  
  private Point2D end
  
  the end of the axis
- dt1t0
  
  private float dt1t0
- dx1x0
  
  private double dx1x0
- dy1y0
  
  private double dy1y0
- sqdx1x0psqdy1y0
  
  private double sqdx1x0psqdy1y0
Constructor Details
- Type2PaintContext
  
  Type2PaintContext(ColorModel colorModel, Point2D start, Point2D end)
  
  Create a paint context
Method Details
- dispose
  
  public void dispose()
  
  Specified by:
  
  dispose in interface PaintContext
- getColorModel
  
  public ColorModel getColorModel()
  
  Specified by:
  
  getColorModel in interface PaintContext
- getRaster
  
  public Raster getRaster(int x, int y, int w, int h)
  
  Specified by:
  
  getRaster in interface PaintContext
- getXPrime
  
  private float getXPrime(float x, float y, float x0, float y0)
  
  x' = (x1 - x0) * (x - x0) + (y1 - y0) * (y - y0) ------------------------------------------- (x1 - x0)^2 + (y1 - y0)^2
- getT
  
  private float getT(float xp)
  
  t = t0 + (t1 - t0) x x'