org.ginsim.gui.graph.canvas

Interface CanvasRenderer

All Superinterfaces:

CanvasEventManager

All Known Implementing Classes:

GraphCanvasRenderer

public interface CanvasRenderer
extends CanvasEventManager

Generic interface for Canvas renderer: all drawing and object selection happens here.

Author:

Aurelien Naldi

Method Summary

Modifier and Type	Method and Description
Dimension	getBounds() Get the (virtual) size of the area needed to paint all objects in this renderer.
Object	getObjectUnderPoint(Point p) Find the object under the provided point.
void	overlay(Graphics2D g, Rectangle area) Draw temporary information on top of the canvas.
void	render(Graphics2D g, Rectangle area) Draw on the canvas.
void	select(Shape s) Select all objects inside the provided shape (usually a simple selection rectangle).

Methods inherited from interface org.ginsim.gui.graph.canvas.CanvasEventManager

cancel, click, dragged, helpOverlay, pressed, released

Method Detail

render

void render(Graphics2D g,
            Rectangle area)

Draw on the canvas. The provided area can be the full visible part of the canvas or a damaged region. Zooming, clipping... is performed by the canvas before calling this method.

Parameters:

g - the clipped graphics object

area - the area to redraw

overlay

void overlay(Graphics2D g,
             Rectangle area)

Draw temporary information on top of the canvas. It can be used to represent moving objects or other temporary information.

Specified by:

overlay in interface CanvasEventManager

Parameters:

g - the clipped graphics object

area - the area to redraw

select

void select(Shape s)

Select all objects inside the provided shape (usually a simple selection rectangle).

Parameters:

s -

getObjectUnderPoint

Object getObjectUnderPoint(Point p)

Find the object under the provided point.

Parameters:

p -

Returns:

a found object at this position, or null if none.

getBounds

Dimension getBounds()

Get the (virtual) size of the area needed to paint all objects in this renderer.

Returns:

the (virtual) size of the rendered canvas.