edu.ksu.cis.bnj.gui.components
Class EdgeState

java.lang.Object
  salvo.jesus.graph.visual.GraphPanelState
      salvo.jesus.graph.visual.GraphPanelEdgeState
          edu.ksu.cis.bnj.gui.components.EdgeState

All Implemented Interfaces:

java.io.Serializable

public class EdgeState

extends salvo.jesus.graph.visual.GraphPanelEdgeState

State object that represents the edge mode in a GraphPanel. Edge mode being the ability to add an edge interactively by dragging the mouse from a vertex and releasing the mouse on another vertex.

Author:

Jesus M. Salvo Jr. With a little modification here and there to eliminate stack trace errors. And also hooks here and there -- Roby Joehanes

See Also:

Serialized Form

Field Summary

protected java.awt.Cursor	edgecursor A cross-hair Cursor object
protected salvo.jesus.graph.visual.GraphPanel	gpanel
protected static java.awt.BasicStroke	marquee
protected NodeManager	owner
protected java.awt.Cursor	previouscursor Existing cursor prior to changing the cursor to a cross-hair
protected java.awt.geom.Line2D.Double	probableedgeline Line2D object that is drawn when an edge is being interactively created.
protected salvo.jesus.graph.visual.VisualVertex	sourcevertex Reference to the VisualVertex object selected during the mousePressed() method.

Constructor Summary

EdgeState(NodeManager owner, salvo.jesus.graph.visual.GraphPanel gpanel)
Creates a GraphPanelEdgeState object for the specified GraphPanel object.

Method Summary

salvo.jesus.graph.visual.GraphPanelState	mouseDragged(java.awt.event.MouseEvent e) If there was a vertex clicked during the start of the drag (during the mousePressed() event), draw a line from the source vertex to the current coordinate.
salvo.jesus.graph.visual.GraphPanelState	mouseMoved(java.awt.event.MouseEvent e) This method sets the cursor to a crosshair whenever the cursor enters a VisualVertex object.
salvo.jesus.graph.visual.GraphPanelState	mousePressed(java.awt.event.MouseEvent e) Identifies the source vertex of a new Edge being created.
salvo.jesus.graph.visual.GraphPanelState	mouseReleased(java.awt.event.MouseEvent e) Signifies the end of a drag.
void	paint(java.awt.Graphics2D g2d) Call VisualGraph.paint() method, passing the Graphics2D context and the probable edge line to be drawn

Methods inherited from class salvo.jesus.graph.visual.GraphPanelState

informTargetVisualGraphComponentOfKeyEvent, informTargetVisualGraphComponentOfMouseEvent, keyPressed, keyReleased, keyTyped, mouseClicked, mouseEntered, mouseExited, recommendState, setGraphPanel

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

sourcevertex

protected salvo.jesus.graph.visual.VisualVertex sourcevertex

Reference to the VisualVertex object selected during the mousePressed() method. This identifies the source vertex of an edge being created.

probableedgeline

protected java.awt.geom.Line2D.Double probableedgeline

Line2D object that is drawn when an edge is being interactively created.

edgecursor

protected java.awt.Cursor edgecursor

A cross-hair Cursor object

previouscursor

protected java.awt.Cursor previouscursor

Existing cursor prior to changing the cursor to a cross-hair

gpanel

protected salvo.jesus.graph.visual.GraphPanel gpanel

owner

protected NodeManager owner

marquee

protected static java.awt.BasicStroke marquee

Constructor Detail

EdgeState

public EdgeState(NodeManager owner,
                 salvo.jesus.graph.visual.GraphPanel gpanel)

Creates a GraphPanelEdgeState object for the specified GraphPanel object.

Method Detail

mousePressed

public salvo.jesus.graph.visual.GraphPanelState mousePressed(java.awt.event.MouseEvent e)

Identifies the source vertex of a new Edge being created.

mouseReleased

public salvo.jesus.graph.visual.GraphPanelState mouseReleased(java.awt.event.MouseEvent e)

Signifies the end of a drag. If there was a vertex clicked during the start of the drag (during the mousePressed() event) and there is a vertex at the end of the drag, then an edge is added to the graph, and the mouse cursor is returned to its original.

mouseDragged

public salvo.jesus.graph.visual.GraphPanelState mouseDragged(java.awt.event.MouseEvent e)

If there was a vertex clicked during the start of the drag (during the mousePressed() event), draw a line from the source vertex to the current coordinate.

mouseMoved

public salvo.jesus.graph.visual.GraphPanelState mouseMoved(java.awt.event.MouseEvent e)

This method sets the cursor to a crosshair whenever the cursor enters a VisualVertex object. The cursor is reset to its original when the mouse cursor leaves a VisualVertex object.

paint

public void paint(java.awt.Graphics2D g2d)

Call VisualGraph.paint() method, passing the Graphics2D context and the probable edge line to be drawn