/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2011, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.swt.action;
import java.awt.geom.AffineTransform;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Display;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.map.event.MapBoundsEvent;
import org.geotools.map.event.MapBoundsListener;
import org.geotools.swt.SwtMapPane;
import org.geotools.swt.tool.InfoTool;
import org.geotools.swt.utils.ImageCache;
/**
* Action that activates the Info tool for the current {@link SwtMapPane map pane}.
*
* @author Andrea Antonello (www.hydrologis.com)
*
*
*
* @source $URL$
*/
public class DrawShapeAction extends MapAction implements MapBoundsListener {
public DrawShapeAction() {
super("Drawshape@D", InfoTool.TOOL_TIP, ImageCache.getInstance().getImage(ImageCache.IMAGE_INFO));
}
private static boolean odd = true;
private static boolean first = true;
/**
* Called when the associated control is activated. Leads to the
* map pane's cursor tool being set to a PanTool object
*
* @param ev the event (not used)
*/
public void run() {
if (first) {
getMapPane().getMapContent().addMapBoundsListener(this);
first = false;
}
Rectangle visibleRect = getMapPane().getVisibleRect();
ReferencedEnvelope displayArea = getMapPane().getDisplayArea();
drawShapes(visibleRect, displayArea, false);
/*
* to switch of drawing, simply do
*/
// getMapPane().setOverlay(null, null, false);
// getMapPane().redraw();
}
/**
* Draws shapes on the map.
*
* @param visibleRect the rectangle in teh screen space.
* @param areaOfInterest the area of interest in world coordinates.
*/
private void drawShapes( Rectangle visibleRect, ReferencedEnvelope areaOfInterest, boolean boundsChanged ) {
Display display = Display.getDefault();
/*
* create an image with transparent color (this can be done better?)
*/
Color white = display.getSystemColor(SWT.COLOR_WHITE);
PaletteData palette = new PaletteData(new RGB[]{white.getRGB()});
final ImageData sourceData = new ImageData(visibleRect.width, visibleRect.height, 1, palette);
sourceData.transparentPixel = 0;
// create the image to draw on
Image img = new Image(display, sourceData);
GC gc = new GC(img);
gc.setAntialias(SWT.ON);
// example lat/long coordinates to draw
double[] worldCoords;
if (odd) {
worldCoords = new double[]{10.0, 40.0, 11.2, 43.3, 11.3, 45.2, 11.4, 46.5};
} else {
worldCoords = new double[]{11.0, 41.0, 12.2, 44.3, 11.3, 45.2, 11.4, 46.5};
}
odd = !odd;
// get the world to screen transform
double[] screenCoords = new double[8];
AffineTransform worldToScreenTransform = getMapPane().getWorldToScreenTransform();
// do the transform
worldToScreenTransform.transform(worldCoords, 0, screenCoords, 0, worldCoords.length / 2);
// draw lines
gc.setForeground(display.getSystemColor(SWT.COLOR_MAGENTA));
gc.setLineWidth(2);
gc.drawLine((int) screenCoords[0], (int) screenCoords[1], (int) screenCoords[2], (int) screenCoords[3]);
gc.drawLine((int) screenCoords[2], (int) screenCoords[3], (int) screenCoords[4], (int) screenCoords[5]);
// draw dots
int size = 10;
gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
gc.fillOval((int) screenCoords[0] - size / 2, (int) screenCoords[1] - size / 2, size, size);
gc.fillOval((int) screenCoords[2] - size / 2, (int) screenCoords[3] - size / 2, size, size);
gc.fillOval((int) screenCoords[4] - size / 2, (int) screenCoords[5] - size / 2, size, size);
gc.setForeground(display.getSystemColor(SWT.COLOR_BLACK));
gc.drawOval((int) screenCoords[0] - size / 2, (int) screenCoords[1] - size / 2, size, size);
gc.drawOval((int) screenCoords[2] - size / 2, (int) screenCoords[3] - size / 2, size, size);
gc.drawOval((int) screenCoords[4] - size / 2, (int) screenCoords[5] - size / 2, size, size);
gc.setAntialias(SWT.OFF);
gc.dispose();
// overlay the image
getMapPane().setOverlay(img, areaOfInterest, false, boundsChanged);
}
public void selectionChanged( IAction action, ISelection selection ) {
}
public void mapBoundsChanged( MapBoundsEvent event ) {
/*
* every time the bounds change (zoom, etc...), the drawing
* has to occurr again on the new bounds
*/
ReferencedEnvelope newAreaOfInterest = event.getNewAreaOfInterest();
Rectangle visibleRect = getMapPane().getVisibleRect();
drawShapes(visibleRect, newAreaOfInterest, true);
}
}