java.lang.Object
- java.awt.Component
- - java.awt.Canvas
  - - net.sourceforge.jiu.gui.awt.ImageCanvas

All Implemented Interfaces:

ImageObserver, MenuContainer, Serializable, Accessible
```
public class ImageCanvas
extends Canvas
```
An AWT canvas that displays an Image object. Capable to display at arbitrary zooming levels. Does not use rendering hints because they require Java 1.2 or higher (although bilinear and bicubic interpolation usually improve display quality when zooming at the cost of slowing down image drawing).

Author:

Marco Schmidt

See Also:

Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from class java.awt.Canvas
  Canvas.AccessibleAWTCanvas
- Nested classes/interfaces inherited from class java.awt.Component
  Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy

Field Summary

Fields
Modifier and Type	Field	Description
`private int`	`height`
`private Image`	`image`
`private ScrollPane`	`myScrollPane`
`private int`	`scaledHeight`
`private int`	`scaledWidth`
`private int`	`width`
`private double`	`zoomFactorX`
`private double`	`zoomFactorY`
`private boolean`	`zoomToFit`

Fields inherited from class java.awt.Component
accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver
ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

Constructors
Constructor Description

ImageCanvas(ScrollPane scrollPane)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`computeZoomToFitSize()`
`Dimension`	`getPreferredSize()`
`double`	`getZoomFactorX()`
`double`	`getZoomFactorY()`
`int`	`getZoomPercentageX()`
`int`	`getZoomPercentageY()`
`void`	`paint(Graphics g)`	Draws image to upper left corner.
`void`	`setImage(Image newImage)`	Specifies a new Image object to be displayed in this canvas.
`void`	`setInterpolation(int newType)`	Sets the interpolation type used for drawing to the argument (must be one of the INTERPOLATION_xyz constants of EditorState), but does not do a redraw.
`void`	`setOriginalSize()`	Sets both zoom factors to `1.0`.
`void`	`setZoomFactor(double newZoomFactor)`
`void`	`setZoomFactors(double newZoomFactorX, double newZoomFactorY)`
`void`	`setZoomToFit(boolean newValue)`
`void`	`update(Graphics g)`	Simply calls `paint(Graphics)` with the argument.

Methods inherited from class java.awt.Canvas
addNotify, createBufferStrategy, createBufferStrategy, getAccessibleContext, getBufferStrategy

Methods inherited from class java.awt.Component
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, deliverEvent, disable, disableEvents, dispatchEvent, doLayout, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getAlignmentX, getAlignmentY, getBackground, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentAt, getComponentAt, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeys, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getListeners, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMinimumSize, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, invalidate, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusCycleRoot, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, layout, list, list, list, list, list, locate, location, lostFocus, minimumSize, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, paramString, postEvent, preferredSize, prepareImage, prepareImage, print, printAll, processComponentEvent, processEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, revalidate, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeys, setFocusTraversalKeysEnabled, setFont, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setMixingCutoutShape, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle, validate

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

Field Detail

image
```
private Image image
```

width
```
private int width
```

height
```
private int height
```

scaledWidth
```
private int scaledWidth
```

scaledHeight
```
private int scaledHeight
```

zoomFactorX
```
private double zoomFactorX
```

zoomFactorY
```
private double zoomFactorY
```

zoomToFit
```
private boolean zoomToFit
```

myScrollPane
```
private ScrollPane myScrollPane
```

Constructor Detail

ImageCanvas

public ImageCanvas(ScrollPane scrollPane)

Method Detail
- computeZoomToFitSize
```
public void computeZoomToFitSize()
```
- getZoomPercentageX
```
public int getZoomPercentageX()
```
- getZoomPercentageY
```
public int getZoomPercentageY()
```
- getPreferredSize
```
public Dimension getPreferredSize()
```
  Overrides:
  
  getPreferredSize in class Component
- paint
```
public void paint(Graphics g)
```
  Draws image to upper left corner.
  
  Overrides:
  
  paint in class Canvas
- setImage
```
public void setImage(Image newImage)
```
  Specifies a new Image object to be displayed in this canvas.
  
  Parameters:
  
  newImage - the new Image object, potentially null
- setOriginalSize
```
public void setOriginalSize()
```
  Sets both zoom factors to 1.0.
- getZoomFactorX
```
public double getZoomFactorX()
```
- getZoomFactorY
```
public double getZoomFactorY()
```
- setInterpolation
```
public void setInterpolation(int newType)
```
  Sets the interpolation type used for drawing to the argument (must be one of the INTERPOLATION_xyz constants of EditorState), but does not do a redraw.
- setZoomFactor
```
public void setZoomFactor(double newZoomFactor)
```
- setZoomFactors
```
public void setZoomFactors(double newZoomFactorX,
                           double newZoomFactorY)
```
- setZoomToFit
```
public void setZoomToFit(boolean newValue)
```
- update
```
public void update(Graphics g)
```
  Simply calls paint(Graphics) with the argument.
  
  Overrides:
  
  update in class Canvas
  
  Parameters:
  
  g - Graphics context

Class ImageCanvas

Nested Class Summary

Nested classes/interfaces inherited from class java.awt.Canvas

Nested classes/interfaces inherited from class java.awt.Component

Field Summary

Fields inherited from class java.awt.Component

Fields inherited from interface java.awt.image.ImageObserver

Constructor Summary

Method Summary

Methods inherited from class java.awt.Canvas

Methods inherited from class java.awt.Component

Methods inherited from class java.lang.Object

Field Detail

image

width

height

scaledWidth

scaledHeight

zoomFactorX

zoomFactorY

zoomToFit

myScrollPane

Constructor Detail

ImageCanvas

Method Detail

computeZoomToFitSize

getZoomPercentageX

getZoomPercentageY

getPreferredSize

paint

setImage

setOriginalSize

getZoomFactorX

getZoomFactorY

setInterpolation

setZoomFactor

setZoomFactors

setZoomToFit

update