j_shapetest.java

一个十分好的java基础学习的课件

// ////////////////////////////////////////////////////////
// 
// J_ShapeTest.java
// 

// ////////////////////////////////////////////////////////

import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.applet.Applet;

interface J_Shape
{
    public abstract void mb_draw(Graphics2D g); // This method cannot have body.
} // End of interface: J_Shape

class J_Circle implements J_Shape
{
    public void mb_draw(Graphics2D g)
    {
        g.setPaint( new GradientPaint( 5, 30, Color.red, 35,
            100, Color.yellow, true ) );  
        g.fill( new Ellipse2D.Double( 20, 20, 100, 100 ) );
    } // End of method: mb_draw
} // End of class: J_Circle

class J_Square implements J_Shape
{
    public void mb_draw(Graphics2D g)
    {
        // Create a texture
        BufferedImage buffImage = new BufferedImage(
            10, 10, BufferedImage.TYPE_INT_RGB );
        
        Graphics2D gg = buffImage.createGraphics( );   
        gg.setColor( Color.yellow ); // draw in yellow
        gg.fillRect( 0, 0, 10, 10 ); // draw a filled rectangle
        gg.setColor( Color.blue );  // draw in black
        gg.drawRect( 1, 1, 6, 6 );   // draw a rectangle
        gg.setColor( Color.green );   // draw in blue
        gg.fillRect( 1, 1, 3, 3 );   // draw a filled rectangle
        gg.setColor( Color.red );    // draw in red
        gg.fillRect( 4, 4, 3, 3 );   // draw a filled rectangle
        
        // paint buffImage onto the JFrame
        g.setPaint( new TexturePaint( buffImage, new Rectangle( 10, 10 ) ) );
        g.fill( new Rectangle2D.Double( 160, 20, 100, 100 ) );
    } // End of method: mb_draw
} // End of class: J_Square

public class J_ShapeTest extends Applet
{
    public void paint(Graphics g)
    {
        Graphics2D g2d= (Graphics2D)g;
        J_Shape entity = new J_Circle( );
        entity.mb_draw(g2d);
        entity = new J_Square( );
        entity.mb_draw(g2d);
    } // End of method: paint
} // End of class: J_ShapeTest