[geotk] Objects animation/movement on map

[Gopinath Asutosh]

Hi Johann Sorel,Thanks for responding.
I adapted SquareGraphics demo to take care of screen flickering issue. Now every eqpt id refreshing its location in background and map.getCanvas().repaint() is invoked from a separate  thread every 15 secs to update locations of all eqpt on screen .

But now i am having another problem. The squares are not changing size when the map is zoomed in/out. How do I fix it? 

Code attached below:
===import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.Rectangle2D;
import java.awt.geom.RoundRectangle2D;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.apache.sis.geometry.GeneralDirectPosition;
import org.apache.sis.storage.DataStoreException;
import org.geotoolkit.display.canvas.AbstractReferencedCanvas2D;

import org.geotoolkit.display.canvas.RenderingContext;
import org.geotoolkit.display.canvas.VisitFilter;
import org.geotoolkit.display.primitive.SearchArea;
//import org.geotoolkit.display.VisitFilter;
//import org.geotoolkit.display.SearchArea;
import org.geotoolkit.display2d.canvas.J2DCanvas;
import org.geotoolkit.display2d.canvas.RenderingContext2D;
import org.geotoolkit.display2d.primitive.GraphicJ2D;
import org.geotoolkit.referencing.CRS;

import org.opengis.display.primitive.Graphic;
import org.opengis.geometry.DirectPosition;
import org.opengis.geometry.Envelope;
import org.opengis.geometry.MismatchedDimensionException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.opengis.referencing.operation.MathTransform;
import org.opengis.referencing.operation.TransformException;
import org.opengis.util.FactoryException;
import org.openide.util.Exceptions;
import org.openide.util.Lookup;

public class SquaresGraphicTorpedo implements GraphicJ2D, Runnable {

    double lat = 22.796212;
    double lon = 86.198888;
    String eqptId = null;
    ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);

    public SquaresGraphicTorpedo(String eqptId) {
        this.eqptId = eqptId;
        int initialDelay = 0;
        int period = 1;
        executor.scheduleWithFixedDelay(this, initialDelay, period, TimeUnit.MINUTES);
    }

    @Override
    public void paint(RenderingContext2D context) {

        final Graphics2D g2d = context.getGraphics();


//        context.switchToObjectiveCRS();
        try {
            CoordinateReferenceSystem sourceCRS = CRS.decode("EPSG:4326");
            CoordinateReferenceSystem targetCRS = context.getDisplayCRS();
            MathTransform tr = CRS.findMathTransform(sourceCRS, targetCRS);
            /*
         * From this point we can convert an arbitrary amount of coordinates using the
         * same MathTransform object. It could be in concurrent threads if we wish.
             */
            DirectPosition sourcePt = new GeneralDirectPosition(
                    lat, // 27°59'17"N
                    lon);  // 86°55'31"E
            DirectPosition targetPt = tr.transform(sourcePt, null);

//            System.out.println("ptDst.x: " + targetPt.getCoordinate()[0] + " ptDst.y: " + targetPt.getCoordinate()[1]);
            RoundRectangle2D.Double rect = new RoundRectangle2D.Double(targetPt.getCoordinate()[0], targetPt.getCoordinate()[1], 20, 10, 10, 10);

            g2d.setPaint(Color.RED);
            g2d.fill(rect);

        } catch (FactoryException | MismatchedDimensionException | TransformException ex) {
            Exceptions.printStackTrace(ex);
        }

    }
@Override
    public void run() {

        getLastLocationOfTheDay();

    }

    private void getLastLocationOfTheDay() {
        
    }

  

    @Override
    public List<Graphic> getGraphicAt(RenderingContext context, SearchArea mask, VisitFilter filter, List<Graphic> graphics) {
        return graphics;
    }

    @Override
    public Object getUserObject() {
        return null;
    }

    @Override
    public Envelope getEnvelope() {
        return null;
    }

    @Override
    public double getZOrderHint() {
        return 0.0;
    }

    @Override
    public void setZOrderHint(double d) {

    }

==
Thanks and regards
Asutosh Gopinath 

    On Thursday, October 13, 2016 1:54 PM, johann sorel <johann.sorel at geomatys.com> wrote:
 

  Hello,
 
 The rendering engine is stateless by default, but we have some possible alternatives.
 
 Solution 1 :
 final JMap2D jmap = new JMap2D();
 jmap.getCanvas().setRenderingHint(GO2Hints.KEY_BEHAVIOR_MODE, GO2Hints.BEHAVIOR_KEEP_TILE);
 This will ask the swing widget to replace the image at the last moment when possible, it should reduce the flickering.
 You can also try the 'GO2Hints.BEHAVIOR_ON_FINISH'
 
 Solution 2 :
 final JMap2D jmap = new JMap2D(true);
 The boolean argument is for 'statefull', the engine will cache more informations and use separate buffers
 for each layer. But it use more memory.
 
 Solution 3 :
 There is also the solution to create a custom decoration over the map,
 A demo is available in the demo-samples module, package : org.geotoolkit.pending.demo.rendering.customdecoration
 But it require a lot more work.
 
 
 
 Johann Sorel
 
 
 
 On 12/10/2016 06:51, Gopinath Asutosh wrote:
  
  Hi , I want to show over 100 objects representing vehicles moving on GIS map. The locations of vehicle change every 10 secs. I tried to create a circle with its center located on GPS coordinates obtained from devices mounted on vehicles. Whenever new coordinates are received I create a new circle and call store.updateFeatures. This plots the circles on new location but it also simultaneously causes the screen to flicker a lot  due to which the animation effect is lost.
  
  It is possible to animate any object using geotoolkit without causing the screen to flicker. 
  Thanks and regards Asutosh Gopinath
   
  
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