jdk.awt.Canvas
A Canvas component represents a blank rectangular area of the screen onto which the application can draw or from which the application can trap input events from the user.
An application must subclass the Canvas class in order to get useful functionality such as creating a custom component. The paint method must be overridden in order to perform custom graphics on the canvas.
A Canvas component represents a blank rectangular area of the screen onto which the application can draw or from which the application can trap input events from the user. An application must subclass the Canvas class in order to get useful functionality such as creating a custom component. The paint method must be overridden in order to perform custom graphics on the canvas.
->canvasclj
(->canvas)(->canvas config)Constructor.
Constructs a new Canvas given a GraphicsConfiguration object.
config - a reference to a GraphicsConfiguration object. - java.awt.GraphicsConfiguration
Constructor. Constructs a new Canvas given a GraphicsConfiguration object. config - a reference to a GraphicsConfiguration object. - `java.awt.GraphicsConfiguration`
add-notifyclj
(add-notify this)Creates the peer of the canvas. This peer allows you to change the user interface of the canvas without changing its functionality.
Creates the peer of the canvas. This peer allows you to change the user interface of the canvas without changing its functionality.
create-buffer-strategyclj
(create-buffer-strategy this num-buffers)(create-buffer-strategy this num-buffers caps)Creates a new strategy for multi-buffering on this component with the required buffer capabilities. This is useful, for example, if only accelerated memory or page flipping is desired (as specified by the buffer capabilities).
Each time this method is called, the existing buffer strategy for this component is discarded.
num-buffers - number of buffers to create - int
caps - the required capabilities for creating the buffer strategy; cannot be null - java.awt.BufferCapabilities
throws: java.awt.AWTException - if the capabilities supplied could not be supported or met; this may happen, for example, if there is not enough accelerated memory currently available, or if page flipping is specified but not possible.
Creates a new strategy for multi-buffering on this component with the required buffer capabilities. This is useful, for example, if only accelerated memory or page flipping is desired (as specified by the buffer capabilities). Each time this method is called, the existing buffer strategy for this component is discarded. num-buffers - number of buffers to create - `int` caps - the required capabilities for creating the buffer strategy; cannot be null - `java.awt.BufferCapabilities` throws: java.awt.AWTException - if the capabilities supplied could not be supported or met; this may happen, for example, if there is not enough accelerated memory currently available, or if page flipping is specified but not possible.
get-accessible-contextclj
(get-accessible-context this)Gets the AccessibleContext associated with this Canvas. For canvases, the AccessibleContext takes the form of an AccessibleAWTCanvas. A new AccessibleAWTCanvas instance is created if necessary.
returns: an AccessibleAWTCanvas that serves as the
AccessibleContext of this Canvas - javax.accessibility.AccessibleContext
Gets the AccessibleContext associated with this Canvas.
For canvases, the AccessibleContext takes the form of an
AccessibleAWTCanvas.
A new AccessibleAWTCanvas instance is created if necessary.
returns: an AccessibleAWTCanvas that serves as the
AccessibleContext of this Canvas - `javax.accessibility.AccessibleContext`get-buffer-strategyclj
(get-buffer-strategy this)Returns the BufferStrategy used by this component. This method will return null if a BufferStrategy has not yet been created or has been disposed.
returns: the buffer strategy used by this component - java.awt.image.BufferStrategy
Returns the BufferStrategy used by this component. This method will return null if a BufferStrategy has not yet been created or has been disposed. returns: the buffer strategy used by this component - `java.awt.image.BufferStrategy`
paintclj
(paint this g)Paints this canvas.
Most applications that subclass Canvas should override this method in order to perform some useful operation (typically, custom painting of the canvas). The default operation is simply to clear the canvas. Applications that override this method need not call super.paint(g).
g - the specified Graphics context - java.awt.Graphics
Paints this canvas. Most applications that subclass Canvas should override this method in order to perform some useful operation (typically, custom painting of the canvas). The default operation is simply to clear the canvas. Applications that override this method need not call super.paint(g). g - the specified Graphics context - `java.awt.Graphics`
updateclj
(update this g)Updates this canvas.
This method is called in response to a call to repaint. The canvas is first cleared by filling it with the background color, and then completely redrawn by calling this canvas's paint method. Note: applications that override this method should either call super.update(g) or incorporate the functionality described above into their own code.
g - the specified Graphics context - java.awt.Graphics
Updates this canvas. This method is called in response to a call to repaint. The canvas is first cleared by filling it with the background color, and then completely redrawn by calling this canvas's paint method. Note: applications that override this method should either call super.update(g) or incorporate the functionality described above into their own code. g - the specified Graphics context - `java.awt.Graphics`
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