org.gvsig.fmap.mapcontrol.tools

Class ZoomOutListenerImpl

java.lang.Object

org.gvsig.fmap.mapcontrol.tools.ZoomOutListenerImpl

All Implemented Interfaces:

PointListener, ToolListener

Direct Known Subclasses:

ZoomOutListener

public class ZoomOutListenerImpl
extends Object
implements PointListener

Listener for doing a zoom out operation on the extent of the ViewPort of the associated MapControl object, selecting a point of the MapControl by a single click of any mouse's button.

Calculates the new extent r with this equations:
ViewPort vp = mapControl.getMapContext().getViewPort();
Point2D p2 = vp.toMapPoint(event.getPoint());
double factor = 1/MapContext.ZOOMOUTFACTOR;
Rectangle2D.Double r = new Rectangle2D.Double();
double nuevoX = p2.getX() - ((vp.getExtent().getWidth() * factor) / 2.0);
double nuevoY = p2.getY() - ((vp.getExtent().getHeight() * factor) / 2.0);
r.x = nuevoX;
r.y = nuevoY;
r.width = vp.getExtent().getWidth() * factor;
r.height = vp.getExtent().getHeight() * factor;
vp.setExtent(r);

The ultimately extent will be an adaptation from that, calculated by the ViewPort bearing in mind the ratio of the available rectangle.

See Also:

MapContext.ZOOMOUTFACTOR, ViewPort.setEnvelope(Envelope), ZoomInListenerImpl, ZoomOutRightButtonListener

Constructor Summary

Constructors

Constructor and Description
ZoomOutListenerImpl(MapControl mapControl) Creates a new ZoomOutListenerImpl object.

Method Summary

Modifier and Type	Method and Description
boolean	cancelDrawing() Determines if the drawing process that this tool executes on the MapControl instance could be canceled or not.
Image	getImageCursor() Gets the Cursor associated to this tool.
void	point(PointEvent event) Called when one click is pressed on the associated MapControl, or the location of the cursor of the mouse has changed on it.
void	pointDoubleClick(PointEvent event) Called when a double click is pressed on the associated MapControl.

Methods inherited from class java.lang.Object

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

Constructor Detail

ZoomOutListenerImpl

public ZoomOutListenerImpl(MapControl mapControl)

Creates a new ZoomOutListenerImpl object.

Parameters:

mapControl - the MapControl where will be applied the changes

Method Detail

point

public void point(PointEvent event)

Description copied from interface: PointListener

Called when one click is pressed on the associated MapControl, or the location of the cursor of the mouse has changed on it.

Specified by:

point in interface PointListener

Parameters:

event - mouse event with the coordinates of the point selected on the associated MapControl

getImageCursor

public Image getImageCursor()

Description copied from interface: ToolListener

Gets the Cursor associated to this tool.

Specified by:

getImageCursor in interface ToolListener

Returns:

component with the bitmap associated to this tool

cancelDrawing

public boolean cancelDrawing()

Description copied from interface: ToolListener

Determines if the drawing process that this tool executes on the MapControl instance could be canceled or not.

Specified by:

cancelDrawing in interface ToolListener

Returns:

true if is cancellable; otherwise returns false

pointDoubleClick

public void pointDoubleClick(PointEvent event)

Description copied from interface: PointListener

Called when a double click is pressed on the associated MapControl.

Specified by:

pointDoubleClick in interface PointListener

Parameters:

event - mouse event and the coordinates of the point selected on the associated MapControl