instancetest.java

来自「java learn PPT java learn PPT java learn」· Java 代码 · 共 48 行

     import java.applet.*;
     import java.awt.*;
     import java.awt.event.*;
     import java.awt.geom.*; 
     import java.util.*;
          
     public class InstanceTest extends Applet 
     {  
          // 要绘制的Shape
          private Shape shape;

          public void init()
          {
               // 基于原点创建一个单位正方形
               shape = new Rectangle2D.Float(-0.5f, -0.5f, 1.0f, 1.0f);
          }

          public void paint(Graphics g)
          {
               // 把传入的Graphics容器转换为一个可用的 Graphics2D 对象
               Graphics2D g2d = (Graphics2D)g;

               // 保存一个恒等变换来清除Graphics2D容器                  
               final AffineTransform identity = new AffineTransform();
 
               Random r = new Random();

               int width = getSize().width;
               int height = getSize().height;

               // 创建形状的 500 个实例
               for(int i = 0; i < 500; i++)
               {
                    // 清除Graphics2D的变换
                    g2d.setTransform(identity);

                    // 随机设置变换
                    g2d.translate(r.nextInt()%width, r.nextInt()%height);
                    g2d.rotate(Math.toRadians(360*r.nextDouble()));
                    g2d.scale(20*r.nextDouble(), 10*r.nextDouble());

                    // draw the shape              
                    g2d.setColor(new Color(r.nextInt()));
                    g2d.fill(shape);
               }
          }

     }    // InstanceTest