graph
Class RotateTextFilter

java.lang.Object
  java.awt.image.ImageFilter
      graph.RotateTextFilter

All Implemented Interfaces:

java.lang.Cloneable, java.awt.image.ImageConsumer

class RotateTextFilter

extends java.awt.image.ImageFilter

This is an extension to the ImageFilter class that will rotate an image a multiple of 90 degrees. This filter is easily extended to allow arbitrary rotations

Field Summary

private int	angle
private byte[]	bpixels
private java.awt.image.ColorModel	colorModel
private double	cos
private int	height
private int[]	ipixels
private double	sin
private int	width
private int	xmax
private int	xmin
private int	ymax
private int	ymin

Fields inherited from class java.awt.image.ImageFilter

consumer

Fields inherited from interface java.awt.image.ImageConsumer

COMPLETESCANLINES, IMAGEABORTED, IMAGEERROR, RANDOMPIXELORDER, SINGLEFRAME, SINGLEFRAMEDONE, SINGLEPASS, STATICIMAGEDONE, TOPDOWNLEFTRIGHT

Constructor Summary

RotateTextFilter(int angle)
Instantiate the class

Method Summary

void	imageComplete(int status) Called when the image is complete.
void	setDimensions(int w, int h) Find the dimensions of the original image and pass onto the image consumer the dimensions of the new roated image
void	setPixels(int x, int y, int w, int h, java.awt.image.ColorModel model, byte[] pixels, int off, int scan) As the pixels of the original image are sent store them in memory as the rotated image.
void	setPixels(int x, int y, int w, int h, java.awt.image.ColorModel model, int[] pixels, int off, int scan) As the pixels of the original image are sent store them in memory as the rotated image.
void	setProperties(java.util.Hashtable props) Add to the properties table of the image that it has been rotated

Methods inherited from class java.awt.image.ImageFilter

clone, getFilterInstance, resendTopDownLeftRight, setColorModel, setHints

Methods inherited from class java.lang.Object

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

Field Detail

angle

private int angle

xmin

private int xmin

xmax

private int xmax

ymin

private int ymin

ymax

private int ymax

width

private int width

height

private int height

cos

private double cos

sin

private double sin

ipixels

private int[] ipixels

bpixels

private byte[] bpixels

colorModel

private java.awt.image.ColorModel colorModel

Constructor Detail

RotateTextFilter

public RotateTextFilter(int angle)

Instantiate the class

Parameters:

angle - the angle to rotate the image. Only multiples of 90 degrees are allowed

Method Detail

setProperties

public void setProperties(java.util.Hashtable props)

Add to the properties table of the image that it has been rotated

Parameters:

props - The property table of the original image

setDimensions

public void setDimensions(int w,
                          int h)

Find the dimensions of the original image and pass onto the image consumer the dimensions of the new roated image

Parameters:

w - width of the original image

h - height of the original image

setPixels

public void setPixels(int x,
                      int y,
                      int w,
                      int h,
                      java.awt.image.ColorModel model,
                      byte[] pixels,
                      int off,
                      int scan)

As the pixels of the original image are sent store them in memory as the rotated image. This method is called with a subset rectangle of the original image.

Parameters:

x - position of Left column in original image of this rectangle

y - poisition of Top row in original image of this rectangle

w - width of this rectangle

h - height of this rectangle

model - Colormodel associated with original image

pixels - Array containing the image or part of it

off - The offset into the pixels array where the parsed rectangle starts

scan - The actual width of the image.

setPixels

public void setPixels(int x,
                      int y,
                      int w,
                      int h,
                      java.awt.image.ColorModel model,
                      int[] pixels,
                      int off,
                      int scan)

As the pixels of the original image are sent store them in memory as the rotated image. This method is called with a subset rectangle of the original image.

Parameters:

x - position of Left column in original image of this rectangle

y - poisition of Top row in original image of this rectangle

w - width of this rectangle

h - height of this rectangle

model - Colormodel associated with original image

pixels - Array containing the image or part of it

off - The offset into the pixels array where the parsed rectangle starts

scan - The actual width of the image.

imageComplete

public void imageComplete(int status)

Called when the image is complete. When this is called by the image producer, we can then pass the rotated image onto the image consumer.

Parameters:

status - Status of the original image from the image producer.