windmills1.java

java 图形处理

import java.awt.*;

public class Windmills1 extends Movie {

   public Picture scene(double t) {
      int rate = 5;
         // How many degrees the sails turn per unit time.

      Picture sun =
         Picture.circle(Color.yellow).size(50)
         .at(350+0.07*t, 460-0.03*t);

      Paint haze =
         new GradientPaint(0,100,Color.lightGray, 0,480,Color.blue);
      Picture sky = Picture.box(haze).scale(640,380).at(0,100);

      Color midGreen = new Color(0,180,0);
      Paint groundPaint =
         new GradientPaint(0,0,midGreen, 0,100,Color.gray);
      Picture ground = Picture.box(groundPaint).scale(640,100);

      Picture background = ground.over(sun).over(sky);

      Picture sail = Picture.box(Color.red).scale(50,150)
                     .at(0,50)
                     .over(Picture.box(Color.red).scale(10,50))
                     .at(-5,0);

      Picture sails = sail
                      .over(sail.turn(90))
                      .over(sail.turn(180))
                      .over(sail.turn(270));

      Picture tower = Picture.box(Color.white)
                      .scale(100,300)
                      .at(-50,0)
                      .over(Picture.triangle
                          (50,300, -50,300, 0,350, Color.white));

      Picture windmill = sails.turn(rate*t).at(0,270)
                         .over(tower)
                         .at(0,-30);

      Picture row = new Empty();
      double s = 1.0;
      double x = 400;
      for (int i = 0; i < 10; i++) {
         row = row.over(windmill.size(s).at(x,100));
         s = s/2;
         x = x/2;
      }

      return row.over(background);
   }

   /********************************************************/

   public static void main(String[] a) {
      Movie m1 = new Windmills1();
      m1.setFrameRate(30);
      m1.setAntialiasingOn(false);
      m1.show(0,0,640,480,0.5,null);
   }
}