Class ncsa.horizon.awt.ScrollerImageCanvas 
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Class ncsa.horizon.awt.ScrollerImageCanvas 

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Canvas
                   |
                   +----ncsa.horizon.awt.ScrollerImageCanvas
public class ScrollerImageCanvas
extends Canvas
Handle scrolling image display.

Variable Index

o currentImage
the currently displayed image
o hScroll
scrollbar of the image canvas
o imageHeight
o imageWidth
image size
o infoStr
display string
o offGraphics
o offScreenImage
variables for double buffering
o tx
image offset on panel
o ty
o vScroll
scrollbar of the image canvas

Constructor Index

o ScrollerImageCanvas()
new constructor
o ScrollerImageCanvas(Image)
Constructor with image
o ScrollerImageCanvas(Image, Scrollbar, Scrollbar)
Constructor with image

Method Index

o getImage()
return the current image in the canvas
o getImageHeight()
return the current image height
o getImageWidth()
return the current image width
o minimumSize()
Returns the minimum size of this component.
o paint(Graphics)
Paints the component.
o reshape(int, int, int, int)
Reshapes the Component to the specified bounding box.
o setImage(Image)
set the current displayed image
o setImageHeight(int)
set the current image height
o setImageSize(int, int)
set the current image size
o setImageWidth(int)
set the current image width
o setScrollbars(Scrollbar, Scrollbar)
Set scrollbars for the canvas
o setTx(int)
o setTy(int)
o update(Graphics)
Updates the component.

Variables

o currentImage 
  protected Image currentImage
the currently displayed image
o imageWidth 
  protected int imageWidth
image size
o imageHeight 
  protected int imageHeight
o offScreenImage 
  protected Image offScreenImage
variables for double buffering
o offGraphics 
  protected Graphics offGraphics
o infoStr 
  protected String infoStr
display string
o tx 
  protected int tx
image offset on panel
o ty 
  protected int ty
o hScroll 
  protected Scrollbar hScroll
scrollbar of the image canvas
o vScroll 
  protected Scrollbar vScroll
scrollbar of the image canvas

Constructors

o ScrollerImageCanvas 
  public ScrollerImageCanvas()
new constructor
o ScrollerImageCanvas 
  public ScrollerImageCanvas(Image image)
Constructor with image
Parameters:
image - the image
o ScrollerImageCanvas 
  public ScrollerImageCanvas(Image image,
                             Scrollbar v,
                             Scrollbar h)
Constructor with image
Parameters:
image - the image
v - the vertical scrollbar
h - the horizontal scrollbar

Methods

o setImage 
  public void setImage(Image img)
set the current displayed image
Parameters:
img - the current image
o setImageSize 
  public void setImageSize(int width,
                           int height)
set the current image size
Parameters:
width - the width of the image
height - the height of the image
o setImageWidth 
  public void setImageWidth(int width)
set the current image width
Parameters:
width - the width of the image
o setImageHeight 
  public void setImageHeight(int height)
set the current image height
Parameters:
height - the height of the image
o reshape 
  public synchronized void reshape(int x,
                                   int y,
                                   int w,
                                   int h)
Reshapes the Component to the specified bounding box.
Overrides:
reshape in class Component
o setScrollbars 
  public void setScrollbars(Scrollbar h,
                            Scrollbar v)
Set scrollbars for the canvas
Parameters:
h - the horizontal scrollbar
v - the vertical scrollbar
o getImage 
  public Image getImage()
return the current image in the canvas
o getImageWidth 
  public int getImageWidth()
return the current image width
o getImageHeight 
  public int getImageHeight()
return the current image height
o minimumSize 
  public Dimension minimumSize()
Returns the minimum size of this component.
Overrides:
minimumSize in class Component
See Also:
preferredSize, LayoutManager
o paint 
  public void paint(Graphics g)
Paints the component.
Parameters:
g - the specified Graphics window
Overrides:
paint in class Canvas
See Also:
paint
o setTx 
  public void setTx(int tx)
o setTy 
  public void setTy(int ty)
o update 
  public void update(Graphics g)
Updates the component. This method is called in response to a call to repaint. You can assume that the background is not cleared.
Parameters:
g - the specified Graphics window
Overrides:
update in class Component
See Also:
update 
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