salvo.jesus.graph.visual

Class GraphPanelEdgeState

java.lang.Object

salvo.jesus.graph.visual.GraphPanelState

salvo.jesus.graph.visual.GraphPanelEdgeState

All Implemented Interfaces:

Serializable

public class GraphPanelEdgeState
extends GraphPanelState

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.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
GraphPanelEdgeState(GraphPanel gpanel) Creates a GraphPanelEdgeState object for the specified GraphPanel object.

Method Summary

Modifier and Type	Method and Description
GraphPanelState	mouseDragged(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.
GraphPanelState	mouseMoved(MouseEvent e) This method sets the cursor to a crosshair whenever the cursor enters a VisualVertex object.
GraphPanelState	mousePressed(MouseEvent e) Identifies the source vertex of a new Edge being created.
GraphPanelState	mouseReleased(MouseEvent e) Signifies the end of a drag.
void	paint(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

Constructor Detail

GraphPanelEdgeState

public GraphPanelEdgeState(GraphPanel gpanel)

Creates a GraphPanelEdgeState object for the specified GraphPanel object.

Method Detail

mousePressed

public GraphPanelState mousePressed(MouseEvent e)

Identifies the source vertex of a new Edge being created.

Overrides:

mousePressed in class GraphPanelState

Parameters:

e - the MouseEvent, as it was received by the GraphPanel.

Returns:

the resulting state, either this state again, or a new state. GraphPanel will take this as the new state.

mouseReleased

public GraphPanelState mouseReleased(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.

Overrides:

mouseReleased in class GraphPanelState

Parameters:

e - the MouseEvent, as it was received by the GraphPanel.

Returns:

the resulting state, either this state again, or a new state. GraphPanel will take this as the new state.

mouseDragged

public GraphPanelState mouseDragged(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.

Overrides:

mouseDragged in class GraphPanelState

Parameters:

e - the MouseEvent, as it was received by the GraphPanel.

Returns:

the resulting state, either this state again, or a new state. GraphPanel will take this as the new state.

mouseMoved

public GraphPanelState mouseMoved(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.

Overrides:

mouseMoved in class GraphPanelState

Parameters:

e - the MouseEvent, as it was received by the GraphPanel.

Returns:

the resulting state, either this state again, or a new state. GraphPanel will take this as the new state.

paint

public void paint(Graphics2D g2d)

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

Specified by:

paint in class GraphPanelState