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  1. 03-08-2012, 06:16 PM #1
    pepsi
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    Default Drawing Shapes on to a Jpanel

    I have made a program that draws a shape depending on the button pressed, but my problem is that it draws the shapes all over the Jframe.. is there any way I can contain the shapes within a Jpanel or something. Sorry I am completely new to this and I am trying hard to understand, here is my code if it helps x.
    Java Code: 
    import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Coursework extends JFrame implements ActionListener
{

		JButton buttonOvalDraw, buttonRectDraw, buttonBothDraw,calArea, randomColor, clearAll;
		JLabel Header, xEnter, yEnter, hEnter, wEnter, areaLabel;
		JPanel headerContainer, xEnterContainer;
		JTextField textxEnter,textyEnter,texthEnter,textwEnter, areaText;
		int x, y,h,w;
		boolean drawOval, drawRect;



	public Coursework()
	{
		setLayout(new FlowLayout());
		setSize(720,600);
		setTitle("My PROGRAM");

		//headerContainer = new JPanel();


		Header = new JLabel (" Drawing Shapes by ***** **** ");
		Header.setFont(new Font("Monospaced", Font.BOLD, 35));
		Header.setForeground(Color.black);
		add(Header);
		//add(headerContainer);
		//headerContainer.add(Header);

		xEnter = new JLabel("Enter X");
		xEnter.setFont(new Font("Serif",Font.ITALIC, 17));
		xEnter.setForeground(Color.blue);
		add(xEnter);

		textxEnter = new JTextField("0", 4);
		add(textxEnter);


		yEnter = new JLabel("Enter Y");
		yEnter.setFont(new Font("Serif",Font.ITALIC, 17));
		yEnter.setForeground(Color.blue);
		add(yEnter);


		textyEnter = new JTextField("0", 4);
		add(textyEnter);

		hEnter = new JLabel("Enter Height");
		hEnter.setFont(new Font("Serif",Font.ITALIC, 17));
		hEnter.setForeground(Color.blue);
		add(hEnter);


		texthEnter = new JTextField("0", 4);
		add(texthEnter);

		wEnter = new JLabel("Enter Width");
		wEnter.setFont(new Font("Serif",Font.ITALIC, 17));
		wEnter.setForeground(Color.blue);
		add(wEnter);

		textwEnter = new JTextField("0", 4);
		add(textwEnter);

		areaLabel = new JLabel("The Area is");
		areaLabel.setFont(new Font("Serif",Font.BOLD, 15));
		areaLabel.setForeground(Color.red);
		add(areaLabel);

		areaText = new JTextField(5);
		add(areaText);

		buttonOvalDraw = new JButton("Draw Oval");
		buttonOvalDraw.setVisible(true);
		buttonOvalDraw.addActionListener(this);
		add(buttonOvalDraw);

		buttonRectDraw = new JButton("Draw Rectangle");
		buttonRectDraw.setVisible(true);
		buttonRectDraw.addActionListener(this);
		add(buttonRectDraw);

		buttonBothDraw = new JButton("Draw Both");
		buttonBothDraw.setVisible(true);
		buttonBothDraw.addActionListener(this);
		add(buttonBothDraw);

		calArea = new JButton("Calculate Area");
		calArea.setVisible(true);
		calArea.addActionListener(this);
		add(calArea);

		randomColor = new JButton("Random Color");
		randomColor.setVisible(true);
		randomColor.addActionListener(this);
		add(randomColor);

		clearAll = new JButton("Clear All");
		clearAll.setVisible(true);
		clearAll.addActionListener(this);
		add(clearAll);



		setVisible(true);
	}



	public void paint(Graphics graf)
	{
		super.paint(graf);
		if (drawOval){



				graf.drawOval(x,y,h,w);
				}

				if(drawRect){


				graf.drawRect(x,y,h,w);
		}

	}

	public void actionPerformed( ActionEvent e )
	{

		x = Integer.parseInt(textxEnter.getText());
		y = Integer.parseInt(textyEnter.getText());
		h = Integer.parseInt(texthEnter.getText());
		w = Integer.parseInt(textwEnter.getText());

		if(e.getSource() == buttonOvalDraw){

				drawRect=false;
				drawOval = true;
				repaint();

}

		if(e.getSource() == buttonRectDraw){

				drawRect=true;
				drawOval = false;
				repaint();

}

		if(e.getSource() == buttonBothDraw){

				drawRect=true;
				drawOval = true;
				repaint();

}

		if(e.getSource() == calArea){



}

		if(e.getSource() == randomColor){


}

		if(e.getSource() == clearAll){



}

	}

	public static void main(String args[])
	{
		new Coursework();

	}
}
    Last edited by Norm; 03-08-2012 at 08:12 PM. Reason: added code tags
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  2. 03-08-2012, 06:18 PM #2
    KevinWorkman's Avatar
    KevinWorkman
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    Default Re: Drawing Shapes on to a Jpanel

    Sure, instead of extending JFrame, simply extend JPanel and add that JPanel to a JFrame. Also, you should override the paintComponent() method, not the paint() method. Recommended reading: Lesson: Performing Custom Painting (The Java™ Tutorials > Creating a GUI With JFC/Swing)
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  3. 03-09-2012, 12:49 AM #3
    pepsi
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    Default Re: Drawing Shapes on to a Jpanel

    I created a Jpanel Class, extended it and changed the paint method.. but now I cant see the shapes at all when i try and draw.. what am i doing wrong??
    here's my new code with slight changes:

    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;

    public class Coursework extends JFrame implements ActionListener
    {

    JButton buttonOvalDraw, buttonRectDraw, buttonBothDraw,calArea, randomColor, clearAll;
    JLabel Header, xEnter, yEnter, hEnter, wEnter, areaLabel;
    JPanel headerContainer, xEnterContainer;
    JTextField textxEnter,textyEnter,texthEnter,textwEnter, areaText;
    int x, y,h,w;
    boolean drawOval, drawRect;



    public Coursework()
    {
    setLayout(new FlowLayout());
    setSize(720,600);
    setTitle("My PROGRAM");

    //headerContainer = new JPanel();


    Header = new JLabel (" Drawing Shapes by ****** **** ");
    Header.setFont(new Font("Monospaced", Font.BOLD, 35));
    Header.setForeground(Color.black);
    add(Header);
    //add(headerContainer);
    //headerContainer.add(Header);

    xEnter = new JLabel("Enter X");
    xEnter.setFont(new Font("Serif",Font.ITALIC, 17));
    xEnter.setForeground(Color.blue);
    add(xEnter);

    textxEnter = new JTextField("0", 4);
    add(textxEnter);


    yEnter = new JLabel("Enter Y");
    yEnter.setFont(new Font("Serif",Font.ITALIC, 17));
    yEnter.setForeground(Color.blue);
    add(yEnter);


    textyEnter = new JTextField("0", 4);
    add(textyEnter);

    hEnter = new JLabel("Enter Height");
    hEnter.setFont(new Font("Serif",Font.ITALIC, 17));
    hEnter.setForeground(Color.blue);
    add(hEnter);


    texthEnter = new JTextField("0", 4);
    add(texthEnter);

    wEnter = new JLabel("Enter Width");
    wEnter.setFont(new Font("Serif",Font.ITALIC, 17));
    wEnter.setForeground(Color.blue);
    add(wEnter);

    textwEnter = new JTextField("0", 4);
    add(textwEnter);

    areaLabel = new JLabel("The Area is");
    areaLabel.setFont(new Font("Serif",Font.BOLD, 15));
    areaLabel.setForeground(Color.red);
    add(areaLabel);

    areaText = new JTextField(5);
    add(areaText);

    buttonOvalDraw = new JButton("Draw Oval");
    buttonOvalDraw.setVisible(true);
    buttonOvalDraw.addActionListener(this);
    add(buttonOvalDraw);

    buttonRectDraw = new JButton("Draw Rectangle");
    buttonRectDraw.setVisible(true);
    buttonRectDraw.addActionListener(this);
    add(buttonRectDraw);

    buttonBothDraw = new JButton("Draw Both");
    buttonBothDraw.setVisible(true);
    buttonBothDraw.addActionListener(this);
    add(buttonBothDraw);

    calArea = new JButton("Calculate Area");
    calArea.setVisible(true);
    calArea.addActionListener(this);
    add(calArea);

    randomColor = new JButton("Random Color");
    randomColor.setVisible(true);
    randomColor.addActionListener(this);
    add(randomColor);

    clearAll = new JButton("Clear All");
    clearAll.setVisible(true);
    clearAll.addActionListener(this);
    add(clearAll);



    setVisible(true);
    }



    class MyDrawPanel extends JPanel{

    public void paintComponent(Graphics graf)
    {
    super.paintComponent(graf);
    if (drawOval){



    graf.drawOval(x,y,h,w);
    }

    if(drawRect){


    graf.drawRect(x,y,h,w);
    }

    }


    }

    public void actionPerformed( ActionEvent e )
    {

    x = Integer.parseInt(textxEnter.getText());
    y = Integer.parseInt(textyEnter.getText());
    h = Integer.parseInt(texthEnter.getText());
    w = Integer.parseInt(textwEnter.getText());

    if(e.getSource() == buttonOvalDraw){

    drawRect=false;
    drawOval = true;
    repaint();

    }

    if(e.getSource() == buttonRectDraw){

    drawRect=true;
    drawOval = false;
    repaint();

    }

    if(e.getSource() == buttonBothDraw){

    drawRect=true;
    drawOval = true;
    repaint();

    }

    if(e.getSource() == calArea){



    }

    if(e.getSource() == randomColor){


    }

    if(e.getSource() == clearAll){



    }

    }

    public static void main(String args[])
    {
    new Coursework();

    }
    }
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  4. 03-09-2012, 09:55 AM #4
    DarrylBurke's Avatar
    DarrylBurke
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    Default Re: Drawing Shapes on to a Jpanel

    Look around the FAQs and find out how to use code tags. A moderator won't add them for you every time.

    db
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  5. 03-09-2012, 01:45 PM #5
    pepsi
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    Default Re: Drawing Shapes on to a Jpanel

    Ok sorry about that, here is the code properly..

    Java Code: 
    import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Coursework extends JFrame implements ActionListener
{

JButton buttonOvalDraw, buttonRectDraw, buttonBothDraw,calArea, randomColor, clearAll;
JLabel Header, xEnter, yEnter, hEnter, wEnter, areaLabel;
JPanel headerContainer, xEnterContainer;
JTextField textxEnter,textyEnter,texthEnter,textwEnter, areaText;
int x, y,h,w;
boolean drawOval, drawRect;



public Coursework()
{
setLayout(new FlowLayout());
setSize(720,600);
setTitle("My PROGRAM");

//headerContainer = new JPanel();


Header = new JLabel (" Drawing Shapes by ****** **** ");
Header.setFont(new Font("Monospaced", Font.BOLD, 35));
Header.setForeground(Color.black);
add(Header);
//add(headerContainer);
//headerContainer.add(Header);

xEnter = new JLabel("Enter X");
xEnter.setFont(new Font("Serif",Font.ITALIC, 17));
xEnter.setForeground(Color.blue);
add(xEnter);

textxEnter = new JTextField("0", 4);
add(textxEnter);


yEnter = new JLabel("Enter Y");
yEnter.setFont(new Font("Serif",Font.ITALIC, 17));
yEnter.setForeground(Color.blue);
add(yEnter);


textyEnter = new JTextField("0", 4);
add(textyEnter);

hEnter = new JLabel("Enter Height");
hEnter.setFont(new Font("Serif",Font.ITALIC, 17));
hEnter.setForeground(Color.blue);
add(hEnter);


texthEnter = new JTextField("0", 4);
add(texthEnter);

wEnter = new JLabel("Enter Width");
wEnter.setFont(new Font("Serif",Font.ITALIC, 17));
wEnter.setForeground(Color.blue);
add(wEnter);

textwEnter = new JTextField("0", 4);
add(textwEnter);

areaLabel = new JLabel("The Area is");
areaLabel.setFont(new Font("Serif",Font.BOLD, 15));
areaLabel.setForeground(Color.red);
add(areaLabel);

areaText = new JTextField(5);
add(areaText);

buttonOvalDraw = new JButton("Draw Oval");
buttonOvalDraw.setVisible(true);
buttonOvalDraw.addActionListener(this);
add(buttonOvalDraw);

buttonRectDraw = new JButton("Draw Rectangle");
buttonRectDraw.setVisible(true);
buttonRectDraw.addActionListener(this);
add(buttonRectDraw);

buttonBothDraw = new JButton("Draw Both");
buttonBothDraw.setVisible(true);
buttonBothDraw.addActionListener(this);
add(buttonBothDraw);

calArea = new JButton("Calculate Area");
calArea.setVisible(true);
calArea.addActionListener(this);
add(calArea);

randomColor = new JButton("Random Color");
randomColor.setVisible(true);
randomColor.addActionListener(this);
add(randomColor);

clearAll = new JButton("Clear All");
clearAll.setVisible(true);
clearAll.addActionListener(this);
add(clearAll);



setVisible(true);
}



class MyDrawPanel extends JPanel{

public void paintComponent(Graphics graf)
{
super.paintComponent(graf);
if (drawOval){



graf.drawOval(x,y,h,w);
}

if(drawRect){


graf.drawRect(x,y,h,w);
}

}


}

public void actionPerformed( ActionEvent e )
{

x = Integer.parseInt(textxEnter.getText());
y = Integer.parseInt(textyEnter.getText());
h = Integer.parseInt(texthEnter.getText());
w = Integer.parseInt(textwEnter.getText());

if(e.getSource() == buttonOvalDraw){

drawRect=false;
drawOval = true;
repaint();

}

if(e.getSource() == buttonRectDraw){

drawRect=true;
drawOval = false;
repaint();

}

if(e.getSource() == buttonBothDraw){

drawRect=true;
drawOval = true;
repaint();

}

if(e.getSource() == calArea){



}

if(e.getSource() == randomColor){


}

if(e.getSource() == clearAll){



}

}

public static void main(String args[])
{
new Coursework();

}
}
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  6. 03-09-2012, 02:37 PM #6
    KevinWorkman's Avatar
    KevinWorkman
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    Default Re: Drawing Shapes on to a Jpanel

    Do you really not use indentation?

    Add some print statements to figure out what's going on- is your ActionListener working? Is your paintComponent() method being called? Can you see your JPanel?
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  7. 03-09-2012, 02:46 PM #7
    pepsi
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    Default Re: Drawing Shapes on to a Jpanel

    Quote Originally Posted by KevinWorkman View Post
    Do you really not use indentation?

    Add some print statements to figure out what's going on- is your ActionListener working? Is your paintComponent() method being called? Can you see your JPanel?
    I'm completely new to all this, so take it easy on me. I thought JPanels were invisble, how can I add a border or background to it so I can see it on the frame, and what do you mean by paintComponent method being called? I genuinely don't know how these things work..

    p.s this is my first Java assignment
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  8. 03-09-2012, 05:39 PM #8
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    KevinWorkman
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    Default Re: Drawing Shapes on to a Jpanel

    Quote Originally Posted by pepsi View Post
    I'm completely new to all this, so take it easy on me. I thought JPanels were invisble, how can I add a border or background to it so I can see it on the frame, and what do you mean by paintComponent method being called? I genuinely don't know how these things work..

    p.s this is my first Java assignment
    I'm not sure how any of what I said was not taking it easy on you. Did you read through the tutorial I posted above? Start with that, and add to it in small steps. That will be a lot easier to debug than 200 lines of code.

    And you can check out the API for useful functions that might make the JPanel more visible: Java Platform SE 6
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