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draw

3 replies on 1 page. Most recent reply: Jun 21, 2002 9:19 PM by Charles Bell

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Chant

Posts: 5
Nickname: meridian
Registered: Jun, 2002

draw

Posted: Jun 21, 2002 8:16 PM

can someone tell me why this simple code isn't working? there's a double buffer but i haven't added the threading yet:

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

public class Shapes extends JApplet
{

private final Dimension wh;
private Image backImage;
private Graphics backGraphics;

public void init()
{

wh = getSize();

}

public void paint(Graphics g)
{

backImage = createImage(wh.width, wh.height);
backGraphics = backImage.getGraphics();

backGraphics.setColor(Color.black);
backGraphics.fillRect(0, 0, wh.width, wh.height);
backGraphics.setColor(Color.red);
backGraphics.fillOval(300, 300, 50, 50);
backGraphics.setColor(Color.green);
backGraphics.fillOval(310, 310, 5, 5);

g.drawImage(backImage, 0, 0, this);

}

}

Charles Bell

Posts: 519
Nickname: charles
Registered: Feb, 2002

Re: draw

Posted: Jun 21, 2002 8:33 PM


change the line:
private final Dimension wh;

to:
private Dimension wh;

make sure your html applet tags has a large enough width and height and it should also work on your PC.
It works on mine.


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

public class Shapes extends JApplet
{

//private final Dimension wh;
private  Dimension wh;
private Image backImage;
private Graphics backGraphics;

public void init(){

wh = getSize();

}


public void paint(Graphics g){


backImage = createImage(wh.width, wh.height);
backGraphics = backImage.getGraphics();


backGraphics.setColor(Color.black);
backGraphics.fil lRect(0, 0, wh.width, wh.height);
backGraphics.setColor(Color.red);
backGraphics.fillOval(300, 300, 50, 50);
backGraphics.setColor(Color.green);
backGraphics.fillOval(310, 310, 5, 5);

g.drawImage(backImage, 0, 0, this);

}

}


*****************************************


<html>
<hea d>
<title>Shapes</title>
</head>

<body>
<applet codebase ="." code="Shapes.class" width = "500" height = "500">

</applet>

</body>

</html>

Chant

Posts: 5
Nickname: meridian
Registered: Jun, 2002

Re: draw

Posted: Jun 21, 2002 8:43 PM

Thanks a lot. that worked fine. Any reason why I can't declare the Dimension final? I thought final mean't that a variable can't be changed...

Charles Bell

Posts: 519
Nickname: charles
Registered: Feb, 2002

Re: draw

Posted: Jun 21, 2002 9:19 PM

The following works also;


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

public class Shapes extends JApplet
{

//private final Dimension wh;
private  final Dimension wh = getSize();
private Image backImage;
private Graphics backGraphics;

	public void init(){
		

		
	}


	public void paint(Graphics g){


		backImage = createImage(wh.width, wh.height);
		backGraphics = backImage.getGraphics();
		
		
		backGraphics.setColor(Color.black);
		backGraphics.fillRect(0, 0, wh.width, wh.height);
		backGraphics.setColor(Color.red);
		backGraphics.fillOval(300, 300, 50, 50);
		backGraphics.setColor(Color.green);
		backGraphics.fillOval(310, 310, 5, 5);
		
		g.drawImage(backImage, 0, 0, this);

	}	

}

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