J2ME Sprite精灵类人物移动

package sprite; import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.Image; import javax.microedition.lcdui.game.Sprite; public class spriteCanvas extends Canvas implements Runnable { public int[] key = new int[4]; public final static int KEY_UP = -1; public final static int KEY_DOWN = -2; public final static int KEY_LEFT = -3; public final static int KEY_RIGHT = -4; public int direct = -1, ndirect; public Thread thread; public Image image; public Sprite mSprite; int[][] FRAME_SEQUENCE = { { 0, 1, 2, 1 }, { 3, 4, 5, 4 }, { 6, 7, 8, 7 }, { 9, 10, 11, 10 }, { 1 }, { 4 }, { 7 }, { 10 } };// 定义帧序列数组 int curX; int curY; public spriteCanvas() { init(); } public void init() { try { image = Image.createImage("/run.png");// 加载Sprite的原图像 } catch (Exception e) { System.out.println("load image error:" + e); } mSprite = new Sprite(image, 21, 31);// 创建精灵，指定精灵的宽度为21，高度为31 // mSprite.setFrameSequence(FRAME_SEQUENCE[1]); curX = (getWidth() - mSprite.getWidth()) / 2;// 获取精灵放置在屏幕中间X坐标 curY = (getHeight() - mSprite.getHeight()) / 2;// 获取精灵放置在屏幕中间Y坐标 mSprite.setRefPixelPosition(curX, curY);// 设置精灵的位置为屏幕的正中间 } public void input() { key[0] = key[2]; key[1] = key[3]; key[2] = 0; } public void update() { mSprite.nextFrame(); if (key[1] == 0) { if (ndirect == 0) mSprite.setFrameSequence(FRAME_SEQUENCE[4]);// 将精灵序列加到精灵属性中 if (ndirect == 1) mSprite.setFrameSequence(FRAME_SEQUENCE[5]); if (ndirect == 2) mSprite.setFrameSequence(FRAME_SEQUENCE[6]); if (ndirect == 3) mSprite.setFrameSequence(FRAME_SEQUENCE[7]); direct = -1; } // System.out.println(key[1]); switch (key[1]) { case KEY_UP: ndirect = 0; if (direct != ndirect) { mSprite.setFrameSequence(FRAME_SEQUENCE[0]);// 将精灵序列加到精灵属性中 direct = ndirect; } mSprite.move(0, -4); break; case KEY_DOWN: ndirect = 1; if (direct != ndirect) { mSprite.setFrameSequence(FRAME_SEQUENCE[1]);// 将精灵序列加到精灵属性中 direct = ndirect; } mSprite.move(0, 4); break; case KEY_LEFT: ndirect = 2; if (direct != ndirect) { mSprite.setFrameSequence(FRAME_SEQUENCE[2]);// 将精灵序列加到精灵属性中 direct = ndirect; } mSprite.move(-4, 0); break; case KEY_RIGHT: ndirect = 3; if (direct != ndirect) { mSprite.setFrameSequence(FRAME_SEQUENCE[3]);// 将精灵序列加到精灵属性中 direct = ndirect; } mSprite.move(4, 0); break; } } protected void paint(Graphics g) { g.setColor(0); g.fillRect(0, 0, getWidth(), getHeight()); mSprite.paint(g);// 绘制精灵 } public void startThread() { if (thread == null) thread = new Thread(this); thread.start(); } public void run() { int debug = 0; // System.out.println("debug:" + debug++); try { while (true) { long stare = System.currentTimeMillis(); // System.out.println("debug:" + debug++); input(); // System.out.println("debug:" + debug++); update(); // System.out.println("debug:" + debug++); repaint(); serviceRepaints(); long end = System.currentTimeMillis() - stare; if (end < 150) Thread.sleep(150 - end); } // spriteMidlet.quitApp(); } catch (Exception e) { System.err.println("run error:" + e + " debug:" + debug); } } /*************************************************************************** * 重载的FullCanvas的按键触发的方法 * * @param keyCode * int 系统传入的按键代码 **************************************************************************/ protected void keyPressed(int keyCode) { key[2] = key[3] = keyCode; } /*************************************************************************** * 重载的FullCanvas的重复一个按键触发的方法 * * @param keyCode * 系统传入的按键代码 **************************************************************************/ protected void keyRepeated(int keyCode) { } /*************************************************************************** * 重载的FullCanvas的释放一个按键触发的方法 * * @param keyCode * 系统传入的按键代码 **************************************************************************/ public void keyReleased(int keyCode) { key[3] = 0; } }