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Thread: jframe hashmap image (rectangle) animation problems post two

  1. #1
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    Default jframe hashmap image (rectangle) animation problems post two

    i posted the question at java-forums.org ( https://www.java-forums.org/new-java...-problems.html ) but realized no one uses the site much anymore so i am here trying to spread the word. please take a look if you can. i was talking about this in the cafe but i am woried i need more visibility

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: jframe hashmap image (rectangle) animation problems post two

    See response on other forum.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: jframe hashmap image (rectangle) animation problems post two

    i fixed it by removing line #52 of the original thread.

    package test;
     
    import java.awt.Graphics;
    import java.awt.Rectangle;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.util.Arrays;
    import java.util.Collections;
    import java.util.HashMap;
    import java.util.Iterator;
    import java.util.Map;
     
    import javax.swing.JFrame;
    import javax.swing.Timer;
     
    public class MovingRectangleTwo extends JFrame implements ActionListener{
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 1L;
    	HashMap<Integer, Rectangle> rec;
    	Timer timer;
    	Integer reccount;
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		new MovingRectangleTwo();
    	}
    	@SuppressWarnings("deprecation")
    	public MovingRectangleTwo(){
    		rec = new HashMap<Integer, Rectangle>();
    		reccount = new Integer(0);
    		timer = new Timer(500, this);
    		timer.start();
    		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		setSize(500, 400);
    		setVisible(true);
    		setTitle("MovingRectangleTwo");
    	}
    	public void paint(Graphics g) {
    		super.paint(g);
    		Iterator<Rectangle> reciterator = rec.values().iterator();
    		while (reciterator.hasNext()) {
    			Rectangle recObject = reciterator.next();
    			System.out.println(recObject.x);
    			g.fillRect(recObject.x, recObject.y, recObject.width, recObject.height);
    			recObject.x--;
    			if (recObject.x <= 0){
    				//System.out.println();
    				//System.out.println();
    				reciterator.remove();
    			}
    		}
    		repaint();
    	}
    	@Override
    	public void actionPerformed(ActionEvent e) {
    		// TODO Auto-generated method stub
    		rec.put(reccount, new Rectangle(getWidth(), getHeight() / 2, 5, 5));
    		reccount++;
    		//System.out.println(rec.keySet());
    	}
    }

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: jframe hashmap image (rectangle) animation problems post two

    The code should NOT call repaint from the paint method. Repaint should only be called when there is something new to paint.

    Why does the code use a Map instead of a List?
    Does the Map ever have more than one entry? If not, why have it.
    If you don't understand my answer, don't ignore it, ask a question.

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