prefuse.render
Class NullRenderer

java.lang.Object
  prefuse.render.NullRenderer

All Implemented Interfaces:

Renderer

public class NullRenderer
extends java.lang.Object
implements Renderer

Renderer that does nothing, causing an item to be rendered "into the void". Possibly useful for items that must exist and have a spatial location but should otherwise be invisible and non-interactive (e.g., invisible end-points for visible edges).

Author:

jeffrey heer

Field Summary

Fields inherited from interface prefuse.render.Renderer

DEFAULT_GRAPHICS

Constructor Summary

NullRenderer()

Method Summary

boolean	locatePoint(java.awt.geom.Point2D p, VisualItem item) Returns true if the Point is located inside the extents of the item.
void	render(java.awt.Graphics2D g, VisualItem item) Render item into a Graphics2D context.
void	setBounds(VisualItem item) Calculates and sets the bounding rectangle for an item.

Methods inherited from class java.lang.Object

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

Constructor Detail

NullRenderer

public NullRenderer()

Method Detail

render

public void render(java.awt.Graphics2D g,
                   VisualItem item)

Description copied from interface: Renderer

Render item into a Graphics2D context.

Specified by:

render in interface Renderer

Parameters:

g - the Graphics2D context

item - the visual item to draw

See Also:

Renderer.render(java.awt.Graphics2D, prefuse.visual.VisualItem)

locatePoint

public boolean locatePoint(java.awt.geom.Point2D p,
                           VisualItem item)

Description copied from interface: Renderer

Returns true if the Point is located inside the extents of the item. This calculation matches against the exaxt item shape, and so is more sensitive than just checking within a bounding box.

Specified by:

locatePoint in interface Renderer

Parameters:

p - the point to test for containment

item - the item to test containment against

Returns:

true if the point is contained within the the item, else false

See Also:

Renderer.locatePoint(java.awt.geom.Point2D, prefuse.visual.VisualItem)

setBounds

public void setBounds(VisualItem item)

Description copied from interface: Renderer

Calculates and sets the bounding rectangle for an item. This is called by a VisualItem when it validates its bounds.

Specified by:

setBounds in interface Renderer

Parameters:

item - the item to compute the bounding box for

See Also:

Renderer.setBounds(prefuse.visual.VisualItem)