Package org.gvsig.fmap.mapcontrol.tools

Class ZoomInListenerImpl

java.lang.Object
org.gvsig.fmap.mapcontrol.tools.ZoomInListenerImpl
All Implemented Interfaces:
RectangleListener, ToolListener
public class ZoomInListenerImpl extends Object implements RectangleListener

Listener for doing a zoom in operation of the extent of the ViewPort of the associated MapControl object, defining a rectangular area.

If the area defined is smaller than 3 pixels x 3 pixels holds the zoom, otherwise, calculates the new extent r with this equations:
double factor = 1/MapContext.ZOOMINFACTOR;
Rectangle2D rect = event.getWorldCoordRect();
Rectangle2D.Double r = new Rectangle2D.Double();
ViewPort vp = mapCtrl.getMapContext().getViewPort();
double nuevoX = rect.getMaxX() - ((vp.getExtent().getWidth() * factor) / 2.0);
double nuevoY = rect.getMaxY() - ((vp.getExtent().getHeight() * factor) / 2.0);
Rectangle2D.Double r; // This will be the new extent
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 where display the graphical information.

Author:
Vicente Caballero Navarro
See Also:

  • Constructor Details

    • ZoomInListenerImpl

      public ZoomInListenerImpl()

    • ZoomInListenerImpl

      public ZoomInListenerImpl(MapControl mapCtrl)

      Creates a new ZoomInListenerImpl object.

      Parameters:
      mapCtrl - the MapControl where is defined the rectangle

  • Method Details

    • rectangle

      public void rectangle(EnvelopeEvent event)
      Description copied from interface: RectangleListener

      Called when user executes a double click with the mouse, finishing the drawn of the rectangle.

      All features of the active and vector layers of the associated MapControl object that their area intersect with the polygonal area defined in the event, will be selected.

      Specified by:
      rectangle in interface RectangleListener
      Parameters:
      event - mouse event and information about the rectangle defined

    • 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