Java: Using Paint

[John]

One of the most popular things Java is used for is to make online games. While making 3d games is near impossible, two dimensional games are very do-able.

Although designing an entire game is beyond the scope of this tutorial, I will introduce to you the basic use of the graphics library.

We are going to implement this into a applet to lets start with the basic framework.

package tutorials;
 
import javax.swing.JApplet;
 
public class GraphicsTut extends JApplet {
 
    public void init() {
        System.out.println("The applet has initialized");
    }
 
} 

Next we are going to import the graphics class located in the java.awt package.

package tutorials;
 
import java.awt.Graphics;
import javax.swing.JApplet;
 
public class GraphicsTut extends JApplet {
 
    public void init() {
        System.out.println("The applet has initialized");
    }
    
} 

Then we are going to override the paint method.

package tutorials;
 
import java.awt.Graphics;
import javax.swing.JApplet;
 
public class GraphicsTut extends JApplet {
 
    public void init() {
        System.out.println("The applet has initialized");
    }
    
    public void paint(Graphics g) {
        
    }
} 

Once we are at this point, we can call many methods on the Graphics object "g." I'm going to create a simple square. To do that we are going to use the

drawRect() method which requires four parameters. The x location of the upper left corner, the y location of the upper left corner, the width, and the

height. We end up with a class that looks like this:

package tutorials;
 
import java.awt.Graphics;
 
import javax.swing.JApplet;
 
public class GraphicsTut extends JApplet {
 
    public void init() {
        System.out.println("The applet has initialized");
    }
    
    public void paint(Graphics g){
        g.drawRect(10, 10, 100, 100);
    }
    
}