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Thread: Help regarding GeneralPath

  1. #1
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    Default Help regarding GeneralPath

    Hi,

    I've been having some computer graphics lectures recently where we start off with 2D. I am able to draw certain shapes with the drawLine-method in paint, but I am still unable to have any visual content other than the background color when I draw a few lines. The code below is real simple and I have been trying to figure out what's wrong with it for hours now and I'd really appreciate some feedback.

    Problem is
    - I can't get the two lines printed
    - I don't understand what's wrong with the code
    - I'm sleepy

    public class generalpathtest extends JApplet{
     
    	public static void main (String[]args) {
    		JFrame frame = new JFrame();
    		frame.setTitle("GeneralPath");
    		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		JApplet applet = new generalpathtest();
    		applet.init();
    		frame.getContentPane().add(applet);
    		frame.pack();
    		frame.setVisible(true);
    	}
     
    	public void init() {
    		JPanel panel = new generalpanel();
    		getContentPane().add(panel);
    	}
    }
     
    class generalpanel extends JPanel {
     
    	public generalpanel() {
    		setBackground(Color.white);
    		setPreferredSize(new Dimension(300,400));
    	}
     
    	public void paintCompontent(Graphics g) {
    		super.paintComponent(g);
    		Graphics2D g2 = (Graphics2D)g;
    		GeneralPath path = new GeneralPath(GeneralPath.WIND_NON_ZERO);
    		g2.setColor(Color.black);
     
    		float w = 500, h = 500;
     
    		float x1 = 0.0f*w;	float y1 = 0.0f*h;
    		float x2 = 0.5f*w;	float y2 = 0.5f*h;
    		float x3 = 0.2f*w;	float y3 = 0.1f*h;
     
    		path.moveTo(x1, y1);
    		path.lineTo(x2, y2);
    		path.lineTo(x3, y3);
    		path.closePath();
     
    		g2.draw(path);
    		g2.translate(120, 120);
    		g2.fill(path);
    	}
    }

    regards
    Ole Martin
    Last edited by olemagro; January 22nd, 2010 at 02:54 AM. Reason: typo


  2. #2
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    Default Re: Help regarding GeneralPath

    Figured it out. It was caused by a tiny, yet fatal error in the paintComponent method name. It said "paintCompontent".
    Last edited by olemagro; January 22nd, 2010 at 08:07 AM.

  3. #3
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    Default Re: Help regarding GeneralPath

    Hello olemagro.

    Welcome to the forums. I'm glad you resolved your issue!
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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    Default Re: Help regarding GeneralPath

    Cheers! Grammar is overrated.

  5. #5
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    Default Re: Help regarding GeneralPath

    For what its worth, you can use the @Override keyword to let the compiler know you are overriding, nice for situation where you may misspell a function and not actually be overriding it:

    //in a class the extends JComponent
    @Override public void paintComponent(Graphics g)//compiles
    {
     
    }
    ////////// versus
    @Override public void paintCompontent(Graphics g)//compiler will throw a compilation error
    {
     
    }

  6. #6
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    Default Re: Help regarding GeneralPath

    Quote Originally Posted by copeg View Post
    For what its worth, you can use the @Override keyword to let the compiler know you are overriding, nice for situation where you may misspell a function and not actually be overriding it:

    //in a class the extends JComponent
    @Override public void paintComponent(Graphics g)//compiles
    {
     
    }
    ////////// versus
    @Override public void paintCompontent(Graphics g)//compiler will throw a compilation error
    {
     
    }
    I didn't know that. I can imagine that being helpful while overriding important method implementations like that.

    Thanks

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