animator.java

来自「java learn PPT java learn PPT java learn」· Java 代码 · 共 158 行

     import java.awt.*;
     import java.util.*;

     // 定义一个自定义的播放动画帧的方式
     public abstract class Animator extends Object
     {
          // 对图像帧链表的引用
          protected LinkedList frames;

          // 动画的当前索引
          protected int currIndex;

          // 创建一个新的Animator对象,其动画帧序列为空
          protected Animator() 
          {
               frames = null;
               currIndex = 0; 
          }

          public final void setFrames(LinkedList list)
          {
               frames = list;
          }

          // 重新设置动画
          public void reset()
          {
               currIndex = 0;
          }

          // 返回动画的当前帧
          public Image getCurrFrame()
          {
               if(frames != null)
               {
                    return (Image)frames.get(currIndex);
               }
               return null;
          }

          // 这个方法定义如何播放帧
          public abstract void nextFrame();

          // 以传入数组作为索引的动画帧
          public static class Indexed extends Animator
          {
               protected int[] indices;
               protected int   arrayIndex;

               public Indexed()
               {
                    super();
                    arrayIndex = 0;
               }

               public Indexed(int[] idx)
               {
                    indices = new int[idx.length];

                    System.arraycopy(idx, 0, indices, 0, idx.length);
                    arrayIndex = 0;
               }

               public void nextFrame()
               {
                    if(frames != null)
                    {
                         // 索引递增
                         if(++arrayIndex >= indices.length)
                         {
                              arrayIndex = 0;
                         }
                         currIndex = indices[arrayIndex];
                    }
               }                
               
          }    // Animator.Indexed

          // 动画帧枚举,必要时从开头循环
          public static class Looped extends Animator
          {
               public Looped()
               {
                    super();
               }

               public void nextFrame()
               {
                    if(frames != null)
                    {
                         if(++currIndex >= frames.size())
                         {
                              reset();
                         }
                    }
               }                

          }    // Animator.Looped

          // 动画帧枚举,但是在到达最后一帧时停止                    
          public static class OneShot extends Animator
          {
               public OneShot()
               {
                    super();
               }

               public void nextFrame()
               {
                    if(frames != null)
                    {
                         if(++currIndex >= frames.size());
                         {
                              currIndex = frames.size()-1;
                         }
                    }
                }                

          }    // Animator.OneShot

          // 在每一次调用nextFrame时产生一个随机的动画帧
          public static class Random extends Animator
          {
               private java.util.Random random;

               public Random()
               {
                    super();

                    random = new java.util.Random();
               }

               public void nextFrame()
               {
                    if(frames != null)
                    {
                         currIndex = random.nextInt() % frames.size();
                    }
               }                

          }    // Animator.Random

          // 代表只包含一帧的动画--这个类节省时间,因为它不做处理
          public static class Single extends Animator
          {
               public Single()
               {
                    super();
               }

               public void nextFrame()
               {
                    // 什么也不做...
               }                

          }    // Animator.Single

     }    // Animator