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Posted to batik-users@xmlgraphics.apache.org by Lasse Riis <lr...@tnb.aau.dk> on 2005/02/23 22:53:26 UTC

Trying to draw my overlay

Hi

I've been looking in to your answers and trying to build my app. But I'm 
stuck now. I restructured it to use some methods to build the app, as 
oppose to a huge main(). It should be very clear to anyone that I am not 
very familiar with Java. So sometimes I have no idea what I'm doing. And 
usually just follow my IDE's (eclipse) reccommendations  (hence the 
'static' methods). So I hope you don't spill your coffee laughing when 
looking at my code :). But bare in mind, this is the first thing I've 
ever written.

I just need this to draw some simple visible image on top of my SVG and 
then later figure out how to move it around. But since I have no clue 
where to start, I think I've started out wrong, so maybe you could give 
me input on how to restructure this poor thing to make my foundation 
proper. Here we go:

import java.awt.*;
import java.awt.Graphics;

import javax.swing.*;

import org.apache.batik.swing.JSVGCanvas;
import org.apache.batik.swing.gvt.GVTTreeRendererAdapter;
import org.apache.batik.swing.gvt.GVTTreeRendererEvent;

public class mapIt {
   
    public static void main(String[] args) {
        JFrame frame = buildGUI();
       
        frame.setSize(200, 600);
        frame.setVisible(true);
             
   }

   public static JSVGCanvas buildCanvas(){
       JSVGCanvas canvas = new JSVGCanvas();

       canvas.setBackground(Color.green);
       canvas.setURI("file:/home/riis/P2/maps/gangen.svg");

       canvas.addGVTTreeRendererListener(new GVTTreeRendererAdapter() {
          public void gvtRenderingCompleted(GVTTreeRendererEvent e) {
                  System.out.print("Rendering done");
                  Graphics box = new Graphics();
                  paint(box);
           }
       });
      
       return canvas;
   }
   
   public static JFrame buildGUI(){
           JFrame f = new JFrame("PANTS - MapIt");
          
           JSVGCanvas svgCanvas = buildCanvas();
      
           JSlider slider = new JSlider();
           
           JPanel panel = new JPanel(new BorderLayout());

           panel.add("North", slider);

           panel.add("Center", svgCanvas);

           f.getContentPane().add(panel);

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        return f;
   }

   public void paint(java.awt.Graphics g) {
           g.setColor(java.awt.Color.RED);
           g.fillRect(10,10,100,100);
       }
  
}


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Re: Trying to draw my overlay

Posted by James Shaw <he...@btopenworld.com>.

Lasse Riis wrote:

> Hi
>
> I've been looking in to your answers and trying to build my app. But 
> I'm stuck now. I restructured it to use some methods to build the app, 
> as oppose to a huge main(). It should be very clear to anyone that I 
> am not very familiar with Java. So sometimes I have no idea what I'm 
> doing. And usually just follow my IDE's (eclipse) reccommendations  
> (hence the 'static' methods). So I hope you don't spill your coffee 
> laughing when looking at my code :). But bare in mind, this is the 
> first thing I've ever written.
>
Lasse, you're completely mad! :-P  One problem I see with your code is 
manually creating a Graphics object and trying to paint to it.  I think 
you should try doing Component.getGraphics(), but I'm not sure which 
component you should choose to paint to.  Personally, I would create the 
image in the SVG DOM, and use event handlers to move it around.

Hope that helps, at least a little bit!
James Shaw

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