prajna.viz.render

Class WeightEdgeRenderer

java.lang.Object

prajna.viz.render.SimpleEdgeRenderer

prajna.viz.render.WeightEdgeRenderer

All Implemented Interfaces:

EdgeRenderer

public class WeightEdgeRenderer
extends SimpleEdgeRenderer

Extension of a SimpleEdgeRenderer that draws weighted edgesusing thicker lines. This renderer calculats the width of the line segment based upon the weight by using a logarithmic scale. The width calculation method can be overridden so that subclasses of this class can provide different calculations. If an edge does not implement the Weighted interface, the edge line that is drawn uses the default drawing width.

Author:

Edward Swing

Constructor Summary

Constructors

Constructor and Description
WeightEdgeRenderer()

Method Summary

Methods

Modifier and Type	Method and Description
protected float	calcEdgeWidth(Weighted edge) Calculate the line width used to draw the edge.
void	drawEdge(java.awt.Graphics g, java.lang.Object edge, java.awt.Point origLoc, java.awt.Point destLoc) Draws the edge into the Graphics Context.
boolean	pickEdge(java.lang.Object edge, java.awt.Point pickPoint, java.awt.Point origLoc, java.awt.Point destLoc) Checks whether the specified pickpoint is within the drawn area for the edge.

Methods inherited from class prajna.viz.render.SimpleEdgeRenderer

getColor, getEdgeColor, getEdgePoints, getHighlight, highlightEdge, setColor, setHighlight

Methods inherited from class java.lang.Object

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

Constructor Detail

WeightEdgeRenderer

public WeightEdgeRenderer()

Method Detail

calcEdgeWidth

protected float calcEdgeWidth(Weighted edge)

Calculate the line width used to draw the edge. By default, the edge is drawn using a logarithmic calculation. If the weight is zero, the width is set to zero.

Parameters:

edge - the weighted edge to draw

Returns:

the line width

drawEdge

public void drawEdge(java.awt.Graphics g,
            java.lang.Object edge,
            java.awt.Point origLoc,
            java.awt.Point destLoc)

Draws the edge into the Graphics Context. This simply draws a line between the two nodes. If the edge is weighted, the line width is set prior to drawing

Specified by:

drawEdge in interface EdgeRenderer

Overrides:

drawEdge in class SimpleEdgeRenderer

Parameters:

g - the Graphics context to display the edge

edge - the edge to display

origLoc - the location of the origin node

destLoc - the location of the destination node

pickEdge

public boolean pickEdge(java.lang.Object edge,
               java.awt.Point pickPoint,
               java.awt.Point origLoc,
               java.awt.Point destLoc)

Checks whether the specified pickpoint is within the drawn area for the edge.

Specified by:

pickEdge in interface EdgeRenderer

Overrides:

pickEdge in class SimpleEdgeRenderer

Parameters:

edge - the node to check for picking

pickPoint - the coordinate of the point to check

origLoc - the orig loc

destLoc - the dest loc

Returns:

whether the point is in the drawn area for this edge