drawarcs.java

java 课件与资料 java 课件与资料 java 课件与资料 java 课件与资料

// Fig. 12.19: DrawArcs.java
// Drawing arcs.
import java.awt.*;
import javax.swing.*;

public class DrawArcs extends JFrame {

   // set window's title bar String and dimensions
   public DrawArcs()
   {
      super( "Drawing Arcs" );

      setSize( 300, 170 );
      setVisible( true );
   }

   // draw rectangles and arcs
   public void paint( Graphics g )
   {
      super.paint( g );  // call superclass's paint method

      // start at 0 and sweep 360 degrees
      g.setColor( Color.YELLOW );
      g.drawRect( 15, 35, 80, 80 );
      g.setColor( Color.BLACK );
      g.drawArc( 15, 35, 80, 80, 0, 360 );

      // start at 0 and sweep 110 degrees
      g.setColor( Color.YELLOW );
      g.drawRect( 100, 35, 80, 80 );
      g.setColor( Color.BLACK );
      g.drawArc( 100, 35, 80, 80, 0, 110 );

      // start at 0 and sweep -270 degrees
      g.setColor( Color.YELLOW );
      g.drawRect( 185, 35, 80, 80 );
      g.setColor( Color.BLACK );
      g.drawArc( 185, 35, 80, 80, 0, -270 );

      // start at 0 and sweep 360 degrees
      g.fillArc( 15, 120, 80, 40, 0, 360 );

      // start at 270 and sweep -90 degrees
      g.fillArc( 100, 120, 80, 40, 270, -90 );
                 
      // start at 0 and sweep -270 degrees
      g.fillArc( 185, 120, 80, 40, 0, -270 );

   } // end method paint

   // execute application
   public static void main( String args[] )
   {
      DrawArcs application = new DrawArcs();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   }

} // end class DrawArcs