Re: Select an element and draw it on the canvas without updating the svg

[javaNoob]

help!! how can i drag a shape on an overlay properly? i can drag a shape but
i cannot erase the previously paited shape..

here is my code:

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.InputEvent;
import java.awt.event.MouseEvent;

import org.apache.batik.swing.gvt.InteractorAdapter;
import org.apache.batik.swing.gvt.JGVTComponent;
import org.apache.batik.swing.gvt.Overlay;

public class CustomInteractor extends InteractorAdapter {

    protected boolean finished = true;
    protected Overlay overlay = new MyOverlay();
    int x = 0;
    int y = 0;

    @Override
    public boolean startInteraction(InputEvent ie) {
        return true;
    }

    @Override
    public boolean endInteraction() {
        return finished;
    }

    @Override
    public void mousePressed(MouseEvent e) {
        x = e.getX();
        y = e.getY();
        JGVTComponent c = (JGVTComponent) e.getSource();
        c.getOverlays().add(overlay);
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        x = e.getX();
        y = e.getY();
        finished = true;
        JGVTComponent c = (JGVTComponent) e.getSource();
        c.getOverlays().remove(overlay);
    }

    @Override
    public void mouseDragged(MouseEvent e) {
        x = e.getX();
        y = e.getY();
        JGVTComponent c = (JGVTComponent) e.getSource();
        overlay.paint(c.getGraphics());
    }

    protected class MyOverlay implements Overlay {

        public void paint(Graphics g) {
            Graphics2D g2d = (Graphics2D) g;
            g2d.setColor(new Color(255, 0, 0, 128));
            g2d.fillRect(x - 5, y - 5, 10, 10);
        }
    }
}
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