imageset.java~2~

来自「基于J2ME的手机游戏软件。可以控制游戏人物在地图上上下左右行走；可以在地图上放」· JAVA~2~ 代码 · 共 116 行

import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.Graphics;
import java.io.IOException;

public final class ImageSet {
  private int totalStates; //总的状态数
  private Image[][] stateFrames; //状态帧集合
  private int[] stateAnimTime; //每个状态动画的过场时间
  private int[] stateFrameWidth; //每个状态帧的帧宽
  private int[] stateFrameHeight; //每个状态帧的帧高

  //error: 0001 裁剪的图片尺寸太大，超过原图大小
  //error: 0002 帧图片不存在

  public ImageSet(int numState) { //构造器：初始化构造的状态个数
    stateAnimTime = new int[numState];
    stateFrameWidth = new int[numState];
    stateFrameHeight = new int[numState];
    stateFrames = new Image[numState][];
  }

  public int addState(Image[] frames, int animTime) { //增加状态
    int state = ++totalStates;
    if (state > stateFrames.length) {
      stateAnimTime = Tool.expandArray(stateAnimTime, 1);
      stateFrameWidth = Tool.expandArray(stateFrameWidth, 1);
      stateFrameHeight = Tool.expandArray(stateFrameHeight, 1);
      stateFrames = Tool.expandArray(stateFrames, 1);
    }
    stateAnimTime[state - 1] = animTime;
    stateFrameWidth[state - 1] = frames[0].getWidth();
    stateFrameHeight[state - 1] = frames[0].getHeight();
    stateFrames[state - 1] = frames;
    return state - 1;
  }

  public int getTotalFrames(int state) {
    return stateFrames[state].length;
  }

  public int getTotalStates() {
    return totalStates;
  }

  public int getAnimTime(int state) {
    return stateAnimTime[state];
  }

  public int getAnimTimePerFrame(int state) {
    return stateAnimTime[state] / stateFrames[state].length;
  }

  public void draw(Graphics target, int state, int frame, int targetX,
                   int targetY, int anchor) {
    if (stateFrames[state][frame] != null) {
      target.drawImage(stateFrames[state][frame],
                       targetX, targetY, anchor);
    }
    else {
      System.out.println("error;0002");
    }
  }

  public Image getFrame(int state, int frame) {
    return stateFrames[state][frame];
  }

  public static Image getImageRegion(Image source, int x, int y, int width,
                                     int height)
  //获得子图形文件
  {
    //	Image result = Image.createImage(width,height);
    if (x + width > source.getWidth() || y + height > source.getHeight()) {
      System.out.println("error:0001");
      System.out.println(x + width);
      System.out.println(y + height);
    }

    int[] rgb = new int[width * height];
    source.getRGB(rgb, 0, width, x, y, width, height);
    Image result = Image.createRGBImage(rgb, width, height, true);

    // 	result.getGraphics().drawImage(source,-x,-y,Graphics.TOP|Graphics.LEFT);
    return result;
  }

  public static Image[] extractFrames(Image source, //源图像文件
                                      int sourceX, int sourceY, //分割帧的起始点
                                      int framesWide, int framesHigh, //帧的个数
                                      int frameWidth, int frameHeight) { //单帧长和宽
    Image[] result = new Image[framesWide * framesHigh];
    int frameCount = 0;
    for (int y = 0; y < framesHigh; y++)
      for (int x = 0; x < framesWide; x++) {
        result[frameCount++] = getImageRegion(source, sourceX + (x * frameWidth),
                                              sourceY + (y * frameHeight),
                                              frameWidth, frameHeight);
      }
    return result;
  }

  public static Image loadClippedImage(String fileName,
                                       int posX, int posY,
                                       int width, int height) {
    try {
      Image fileImage = Image.createImage(fileName);
      return getImageRegion(fileImage, posX, posY, width, height);
    }
    catch (IOException ioe) {
      System.out.println("error:0005");

    }
    return null;
  }
}