java.awt
Class Canvas
- Accessible, ImageObserver, MenuContainer, Serializable
The Canvas component provides a blank rectangular
area, which the client application can use for drawing and for
capturing events. By overriding the paint() method,
the canvas can be used for anything from simple line drawings to
full-scale custom components.
Canvas()- Initializes a new instance of
Canvas.
|
Canvas(GraphicsConfiguration graphicsConfiguration)- Initializes a new instance of
Canvas
with the supplied graphics configuration.
|
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, addNotify, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, deliverEvent, disable, disableEvents, dispatchEvent, doLayout, enable, enable, enableEvents, enableInputMethods, extends EventListener> T[] getListeners, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getAccessibleContext, getAlignmentX, getAlignmentY, getBackground, 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, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMinimumSize, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getParent, getPeer, getPreferredSize, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, invalidate, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusCycleRoot, isFocusOwner, isFocusTraversable, isFocusable, 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, paint, 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, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusTraversalKeys, setFocusTraversalKeysEnabled, setFocusable, setFont, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle, update, validate |
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
Canvas
public Canvas()
Initializes a new instance of Canvas.
Canvas
public Canvas(GraphicsConfiguration graphicsConfiguration)
Initializes a new instance of Canvas
with the supplied graphics configuration.
graphicsConfiguration - the graphics configuration to use
for this particular canvas.
createBufferStrategy
public void createBufferStrategy(int numBuffers)
Creates a buffering strategy that manages how this canvas is
repainted. This method attempts to create the optimum strategy
based on the desired number of buffers. Hardware or software
acceleration may be used.
createBufferStrategy attempts different levels of optimization,
but guarantees that some strategy with the requested number of
buffers will be created even if it is not optimal. First it
attempts to create a page flipping strategy, then an accelerated
blitting strategy, then an unaccelerated blitting strategy.
Calling this method causes any existing buffer strategy to be
destroyed.
numBuffers - the number of buffers in this strategy
createBufferStrategy
public void createBufferStrategy(int numBuffers,
BufferCapabilities caps)
throws AWTException Creates a buffering strategy that manages how this canvas is
repainted. This method attempts to create a strategy based on
the specified capabilities and throws an exception if the
requested strategy is not supported.
Calling this method causes any existing buffer strategy to be
destroyed.
numBuffers - the number of buffers in this strategycaps - the requested buffering capabilities
paint
public void paint(Graphics gfx)
Repaints the canvas window. This method should be overridden by
a subclass to do something useful, as this method simply paints
the window with the background color.
- paint in interface Component
gfx - the Graphics to use for painting
update
public void update(Graphics graphics)
Updates the canvas in response to a request to
repaint() it. The canvas is cleared
with the current background colour, before paint()
is called to add the new contents. Subclasses
which override this method should either call this
method via super.update(graphics) or re-implement
this behaviour, so as to ensure that the canvas is
clear before painting takes place.
- update in interface Component
graphics - the graphics context.
Canvas.java --
Copyright (C) 1999, 2000, 2002, 2004 Free Software Foundation
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