com.vistech.imageviewer
Class Scroll

java.lang.Object
  |
  +--com.vistech.imageviewer.Scroll

All Implemented Interfaces:

ScrollController, java.io.Serializable

public class Scroll

extends java.lang.Object

implements ScrollController, java.io.Serializable

Scrolls an image displayed on a canvas. The canvas object must implement the ImageManipulator interface.

Version:

1.0 1 Nov 1999

Author:

Lawrence Rodrigues

See Also:

Serialized Form

Field Summary

protected java.awt.geom.AffineTransform	atx
protected ImageManipulator	imageCanvas
protected java.awt.Point	panOffset

Constructor Summary

Scroll()

Scroll(ImageManipulator imageCanvas)

Method Summary

java.awt.Point	getPanOffset() Returns the panOffset property.
void	reset()
void	resetAndTranslate(int dx, int dy)
void	scroll(int x, int y) Scrolls the image.
void	setImageManipulator(ImageManipulator imageCanvas)
void	setPanOffset(java.awt.Point panOffset) Gets the panOffset property.
void	startScroll(int x, int y) Starts the scroll and sets the anchor point.
void	stopScroll() Stops scroll.
void	translate(double diffx, double diffy)
void	translateIncr(double incrx, double incry)

Methods inherited from class java.lang.Object

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

Field Detail

atx

protected java.awt.geom.AffineTransform atx

panOffset

protected java.awt.Point panOffset

imageCanvas

protected ImageManipulator imageCanvas

Constructor Detail

Scroll

public Scroll()

Scroll

public Scroll(ImageManipulator imageCanvas)

Parameters:

imagecanvas - the component on which the image is drawn.

Method Detail

setImageManipulator

public void setImageManipulator(ImageManipulator imageCanvas)

Parameters:

imagecanvas - the component on which the image is drawn.

setPanOffset

public void setPanOffset(java.awt.Point panOffset)

Description copied from interface: ScrollController

Gets the panOffset property.

Specified by:

setPanOffset in interface ScrollController

Following copied from interface: com.vistech.imageviewer.ScrollController

Parameters:

panOffset - the offset by which the currently displayed image is moved from the previous position.

getPanOffset

public java.awt.Point getPanOffset()

Description copied from interface: ScrollController

Returns the panOffset property.

Specified by:

getPanOffset in interface ScrollController

Following copied from interface: com.vistech.imageviewer.ScrollController

Returns:

the panOffset.

translateIncr

public void translateIncr(double incrx,
                          double incry)

translate

public void translate(double diffx,
                      double diffy)

resetAndTranslate

public void resetAndTranslate(int dx,
                              int dy)

scroll

public void scroll(int x,
                   int y)

Description copied from interface: ScrollController

Scrolls the image.

Specified by:

scroll in interface ScrollController

Following copied from interface: com.vistech.imageviewer.ScrollController

Parameters:

x - the x coordinate of the current position.

y - the y coordinate of the current position.

startScroll

public void startScroll(int x,
                        int y)

Description copied from interface: ScrollController

Starts the scroll and sets the anchor point.

Specified by:

startScroll in interface ScrollController

Following copied from interface: com.vistech.imageviewer.ScrollController

Parameters:

x - the x coordinate of the scroll anchor.

y - the y coordinate of the scroll anchor.

stopScroll

public void stopScroll()

Description copied from interface: ScrollController

Stops scroll.

Specified by:

stopScroll in interface ScrollController

reset

public void reset()