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Thread: Screenshot wont draw to picture?

  1. #1
    Junior Member
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    Dec 2011
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    Default Screenshot wont draw to picture?

    I have a screenshot program I made, and for some reason it "draws" to the screen. It really does that thing that Windows likes to do(and I hate it) when it freezes up and you can see random crap like the edge of your window that isn't there anymore.
    The only problem is, it does this, and takes a screenshot when I look away from the program.
    Here is my code:
    import java.awt.Dimension;
    import java.awt.Graphics;
    import java.awt.Image;
    import java.awt.Rectangle;
    import java.awt.Robot;
    import java.awt.Toolkit;
    import java.awt.image.BufferedImage;
    import javax.swing.JFrame;
    public class GuiStart extends JFrame {
    	private static final long serialVersionUID = -621866894461974337L;
    	public static BufferedImage remoteDisplayImage;
    	public GuiStart() {
    		Thread updateThread = new Thread(new UpdateScreen());
    	public void paint(Graphics g) {
    		Image img = remoteDisplayImage;
    		g.drawImage(img, 0, 0, this);
    class UpdateScreen implements Runnable {
    	public void run() {
    		while (true) {
    			try {
    				Toolkit toolkit = Toolkit.getDefaultToolkit();
    				Dimension screenSize = toolkit.getScreenSize();
    				Rectangle rectangle = new Rectangle(0, 0, (int)screenSize.getWidth(), (int)screenSize.getHeight());
    				Robot robot = new Robot();
    				BufferedImage shot = robot.createScreenCapture(rectangle);
    				GuiStart.remoteDisplayImage = shot;
    			} catch(Exception ex) { ex.printStackTrace(); }
    BTW, sorry for the name of the topic, I meant "Screenshot wont draw to form" :L

  2. #2
    Forum Squatter newbie's Avatar
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    Nov 2010
    North Wales
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    Default Re: Screenshot wont draw to picture?

    Any time in which the frame needs to be refreshed, such as resizing or moving the frame out of the bounds of your monitor, the paint(Graphics) method will be called.
    So I imagine what you're seeing is the new screenshot being painted, but containing the old screenshot (as it was on your screen when the screen capture occurred) resulting in some weird self contained image.
    Please use [highlight=Java]//code goes here...[/highlight] tags when posting your code

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