org.opengis.display.canvas
Class CanvasEvent

Show UML class diagram

Object
  EventObject
      CanvasEvent

All Implemented Interfaces:

Serializable

public abstract class CanvasEvent
extends EventObject

Event sent by a canvas to it registered listeners when its state changed.

Since:

GeoAPI 2.2

See Also:

Serialized Form

Field Summary

Fields inherited from class EventObject

source

Constructor Summary

CanvasEvent(Canvas source)
Creates a new event having the given canvas as a source.

Method Summary

abstract MathTransform	getChange() Returns the change from the old state to the new state in units of objective CRS.
abstract MathTransform	getChange(CanvasState other) Deprecated. This method does not said is the change is computed from the old or the new state. If we need this functionality, then the method should move to CanvasState.
abstract RenderingState	getNewRenderingstate()
abstract CanvasState	getNewState() Returns the canvas state after the change.
abstract RenderingState	getOldRenderingstate()
abstract CanvasState	getOldState() Returns the canvas state prior the change.
Canvas	getSource() Returns the canvas on which the event occured.

Methods inherited from class EventObject

toString

Methods inherited from class Object

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

Constructor Detail

CanvasEvent

public CanvasEvent(Canvas source)

Creates a new event having the given canvas as a source.

Parameters:

source - The canvas on which the event initially occurred.

Throws:

IllegalArgumentException - If the given source is null.

Method Detail

getSource

public Canvas getSource()

Returns the canvas on which the event occured.

Overrides:

getSource in class EventObject

Returns:

The source canvas.

getOldState

public abstract CanvasState getOldState()

Returns the canvas state prior the change.

Returns:

The old canvas state.

getNewState

public abstract CanvasState getNewState()

Returns the canvas state after the change.

Returns:

The new canvas state.

getChange

public abstract MathTransform getChange()

Returns the change from the old state to the new state in units of objective CRS. This change is typically (but is not restricted to) an affine transform.

Example: if the objective CRS uses a map projection with axis in metres, and if the user pan the map, then the change is an affine transform containing translation terms in metres.

Returns:

The change from the old state to the new state, typically as an affine transform.

getChange

@Deprecated
public abstract MathTransform getChange(CanvasState other)

Deprecated. This method does not said is the change is computed from the old or the new state. If we need this functionality, then the method should move to CanvasState.

Calculates to the given canvas state.

getOldRenderingstate

public abstract RenderingState getOldRenderingstate()

getNewRenderingstate

public abstract RenderingState getNewRenderingstate()