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Class att.grappa.DrawSubgraphPeer

java.lang.Object
   |
   +----att.grappa.DrawObjectPeer
           |
           +----att.grappa.DrawSubgraphPeer

public class DrawSubgraphPeer
extends DrawObjectPeer
This class provides the basis for actually drawing subgraph elements on a pane. For each DrawSubgraph instance and target DrawPane instance, there is one DrawSubgraphPeer instance. The size and position of the object are possibly scaled and translated from the values originally supplied through the element attributes as a consequence of the characteristics of the DrawPane. Certainly the y-axis is flipped to account for the origin at the upper-left as used by the AWT versus the origin to the lower-left as used by the graph.

Version:
1.1, 30 Sep 1999; Copyright 1996 - 1999 by AT&T Corp.
Author:
John Mocenigo, Research @ AT&T Labs

Constructor Index

 o DrawSubgraphPeer(DrawSubgraph, DrawPane)
Create an instance of a DrawSubgraphPeer related to the supplied DrawSubgraph and DrawPane.

Method Index

 o draw(Graphics, GraphicContext)
Draws the subgraph using the specified graphics information.
 o getBounds()
Gets the bounds of this peer in terms of the DrawPane coordinates.
 o inPeer(int, int)
Checks if the supplied co-ordinates are in the specific shape of this peer.
 o setupPeer(boolean)
Setup this peer.

Constructors

 o DrawSubgraphPeer
 public DrawSubgraphPeer(DrawSubgraph drawSubgraph,
                         DrawPane pane)
Create an instance of a DrawSubgraphPeer related to the supplied DrawSubgraph and DrawPane.

Parameters:
drawSubgraph - the source object for this peer object
pane - the pane to use when drawing this peer

Methods

 o inPeer
 public boolean inPeer(int x,
                       int y)
Checks if the supplied co-ordinates are in the specific shape of this peer.

Parameters:
x - the x co-ordinate to check
y - the y co-ordinate to check
Returns:
true if the co-ordinates lie inside the peer or on its boundary, false otherwise.
Overrides:
inPeer in class DrawObjectPeer
 o getBounds
 public Rectangle getBounds()
Gets the bounds of this peer in terms of the DrawPane coordinates.

Returns:
the bounding box of the peer
Overrides:
getBounds in class DrawObjectPeer
 o setupPeer
 public void setupPeer(boolean setupTextToo)
Setup this peer. The setup does the actual co-ordinate mappings from what is available in the DrawNode object to the DrawPane co-ordinates.

Parameters:
setupTextToo - indicates if text peer should be setup as well
Overrides:
setupPeer in class DrawObjectPeer
 o draw
 public void draw(Graphics gr,
                  GraphicContext context)
Draws the subgraph using the specified graphics information.

Parameters:
gr - the AWT graphics context to use for drawing, if the value is null, then the off-screen canvas Graphics is used.
context - the graphic context to use when drawing. If the context is null, the object's context is used.
Overrides:
draw in class DrawObjectPeer

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