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Thread: How to display a Rectangle object in JFrame (Problem).

  1. #1
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    Default How to display a Rectangle object in JFrame (Problem).

    The frame is displayed empty,, so how to make the Rectangle object visible

    package rectang;
     
    import javax.swing.*;
    import java.awt.*;
    import java.awt.Graphics.*;
     
    public class RectAn extends JFrame
    {
     
       public void paint(Graphics g)
       {
          super.paint(g);
          Rectangle r1 = new Rectangle(); //Here is the object I mean. 
          r1.setBounds(20, 20, 40, 50);    //Setting its bounds.
       }
     
       public RectAn(String title)
       {
          super(title);
          this.setSize(400, 400);
          setDefaultCloseOperation(EXIT_ON_CLOSE);
       }
    }

    Main method


    package rectang;
     
    public class RectanG
    {
     
       public static void main(String[] args)
       {
          RectAn r = new RectAn("Rectangle");
          r.setVisible(true);
       }
    }


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: How to display a Rectangle object in JFrame (Problem).

    You never actually draw anything. Check out the Graphics API for useful functions.

    Recommended reading: Lesson: Performing Custom Painting (The Java™ Tutorials > Creating a GUI With JFC/Swing)
    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
    Static Void Games - Play indie games, learn from game tutorials and source code, upload your own games!

  3. #3
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    Default Re: How to display a Rectangle object in JFrame (Problem).

    you need to add

    g.drawRect(nameofrect, x,y,width,height);

    but do not just use this find out why and use the API docs so you can
    find out why you need to use this method, although pretty self explanatory.
    Just be nice.

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