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java.lang.Object
   |
   +----java.awt.Component
           |
           +----Draw

Summary

public class  Draw
     extends java.awt.Component
{
          // Fields 21
     private static final int RAYS;
     private static int[] xPoints1;
     private static int[] xPoints10;
     private static int[] xPoints2;
     private static int[] xPoints3;
     private static int[] xPoints4;
     private static int[] xPoints5;
     private static int[] xPoints6;
     private static int[] xPoints7;
     private static int[] xPoints8;
     private static int[] xPoints9;
     private static int[] yPoints1;
     private static int[] yPoints10;
     private static int[] yPoints2;
     private static int[] yPoints3;
     private static int[] yPoints4;
     private static int[] yPoints5;
     private static int[] yPoints6;
     private static int[] yPoints7;
     private static int[] yPoints8;
     private static int[] yPoints9;

          // Constructors 1
     public Draw();

          // Methods 4
     public static void main(String[]);

     public Dimension getPreferredSize();
     public Dimension getSize();
     public void paint(Graphics);
}

A demonstration of Java's basic graphics drawing primitives.

Creates a new Class that extends the java.awt.Component class. This means that we will inherit various data and methods from this class. The Component is the basic drawing class for graphics.

This is the second Java example and shows basic graphics drawing primitives: drawRect fillRect drawArc fillArc drawLine drawPolyline

It should look like:

Author:

Andrew Marriott. , © Curtin University of Technology 1998

Fields

· RAYS

Summary  |  Top

   private static final int RAYS

An integer constant which indicates how many rays there are on the star.

   private static int[] xPoints1

   private static int[] yPoints1

   private static int[] xPoints2

   private static int[] yPoints2

   private static int[] xPoints3

   private static int[] yPoints3

   private static int[] xPoints4

   private static int[] yPoints4

   private static int[] xPoints5

   private static int[] yPoints5

   private static int[] xPoints6

   private static int[] yPoints6

   private static int[] xPoints7

   private static int[] yPoints7

   private static int[] xPoints8

   private static int[] yPoints8

   private static int[] xPoints9

   private static int[] yPoints9

Integer array which is used to hold the coordinates of the bignose image.

   private static int[] xPoints10

   private static int[] yPoints10

Constructors

· Draw

Summary  |  Top

   public Draw() 

The constructor does nothing special. The super() constructor will be called by default. This will construct the component we extend from.

See Also: Component

   public Dimension getSize() 

Returns the size of this component. Just returns our size. Why can't I use setSize() and let the Component methods handle this?

Overrides:

getSize in class Component

See Also: Dimension

   public Dimension getPreferredSize() 

Returns the preferred size of this component. Just calls getSize(). Why do we need to do this?

Overrides:

getPreferredSize in class Component

See Also: getSize

   public void paint(Graphics graphics) 

Draws the various objects on the Screen.

The paint method will erase the drawing area to the background colour, and then set the foreground drawing colour. The various geometric objects are then drawn on the screen in the foreground Colour using the Graphics of the component.

Parameter	Description
graphics	The graphics of the drawable surface.

Overrides:

paint in class Component

See Also: getSize, getBackground, getForeground, Graphics, setColor, drawRect, fillRect, drawArc, fillArc, drawLine, drawPolyline, getDefaultToolkit, sync

   public static void main(String[] args) 

Test the new Component.

Create a Frame to hold the component, create the component and then set it's foreground and background colour.
Add the component to the Frame and then pack the Frame. Then make it all visible on the screen.

Parameter	Description
args	The arguments passed in from the invocation of this java class. First element is NOT name of program.

See Also: Frame, setBackground, setForeground, add, pack, setVisible

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