diva.canvas

Interface VisibleComponent

All Superinterfaces:

CanvasComponent

All Known Subinterfaces:

Connector, Figure, FigureContainer, GrabHandle, ShapedFigure, Terminal

All Known Implementing Classes:

AbstractConnector, AbstractFigure, AbstractFigureContainer, ArcConnector, ArcManipulator, AttributeBoundsManipulator, BasicEdgeHighlighter, BasicEllipse, BasicFigure, BasicGrabHandle, BasicHighlighter, BasicRectangle, BoundsManipulator, CircleManipulator, CompositeFigure, ConnectorManipulator, ConnectorTutorial.SitedRectangle, FigureDecorator, FigureLayer, FigureTutorial.CustomRectangle, FigureWrapper, GridLayer, IconFigure, ImageFigure, KielerLayoutArcConnector, KielerLayoutConnector, LabelFigure, LabelWrapper, LinkManhattanConnector, ManhattanConnector, Manipulator, MoveHandle, OverlayLayer, PaintedFigure, PaneWrapper, PathFigure, PathManipulator, PortTerminal, RelativeLinkFigure, RoundedRectangle, ShadowHighlighter, StateBubble, StraightConnector, StraightTerminal, SwingWrapper, TerminalFigure, TransformedFigureTutorial.CloudFigure, TypedDecorator, VectorFigure

public interface VisibleComponent
extends CanvasComponent

A visible component is a canvas component that is painted onto a graphics context. This interface contains a small set of methods that are required by any such object. It is also used as a tagging interface so that paint routines can tell whether certain objects want to be painted or not.

Version:

$Id$

Author:

John Reekie

Pt.AcceptedRating:

Yellow

Method Summary

Modifier and Type	Method and Description
boolean	isVisible() Test the visibility flag of this object.
void	paint(java.awt.Graphics2D graphics2D) Paint this object onto a 2D graphics object.
void	paint(java.awt.Graphics2D graphics2D, java.awt.geom.Rectangle2D region) Paint this object onto a 2D graphics object, within the given region.
void	setVisible(boolean flag) Set the visibility flag of this object.

Methods inherited from interface diva.canvas.CanvasComponent

getParent, getTransformContext, repaint, repaint

Method Detail

isVisible

boolean isVisible()

Test the visibility flag of this object. Note that this flag does not indicate whether the object is actually visible on the screen, as one of its ancestors may not be visible.

Returns:

true if the object is visible.

paint

void paint(java.awt.Graphics2D graphics2D)

Paint this object onto a 2D graphics object. Implementors should first test if the visibility flag is set, and paint the object if it is.

Parameters:

graphics2D - The 2D graphics object that this object it to be painted upon.

paint

void paint(java.awt.Graphics2D graphics2D,
           java.awt.geom.Rectangle2D region)

Paint this object onto a 2D graphics object, within the given region. Implementors should first test if the visibility flag is set, and paint the object if it is. The provided region can be used to optimize the paint, but implementors can assume that the clip region is correctly set beforehand.

Parameters:

graphics2D - The 2D graphics object that this object it to be painted upon.

region - The region.

setVisible

void setVisible(boolean flag)

Set the visibility flag of this object. If the flag is false, then the object will not be painted on the screen.

Parameters:

flag - True if this object is to be visible.