|
透明度渐变效果midp2.0
|
 Author: 一滴蔚蓝色 |  Date: 2007-07-29 |
 View: 2014 |
开发技术 - 程序设计 |  Digg:
0
|
import java.io.IOException; import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.Image; import javax.microedition.midlet.MIDlet; import javax.microedition.midlet.MIDletStateChangeException; /** * * @author Jagie * */ public class ShadowMIDlet extends MIDlet { Canvas c = new ShadowCanvas(); public ShadowMIDlet() { } protected void startApp() throws MIDletStateChangeException { Display.getDisplay(this).setCurrent(c); } protected void pauseApp() { // TODO Auto-generated method stub } protected void destroyApp(boolean arg0) throws MIDletStateChangeException { // TODO Auto-generated method stub } } /** * * @author Jagie * */ class ShadowCanvas extends Canvas implements Runnable { int w, h; // 原始图片 Image srcImage; // 原始图片的像素数组 int[] srcRgbImage; // 渐变图片的像素数组 int[] shadowRgbImage; int imgWidth, imgHeight; int count; public ShadowCanvas() { w = this.getWidth(); h = this.getHeight(); try { srcImage = Image.createImage("/av.png"); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } imgWidth = srcImage.getWidth(); imgHeight = srcImage.getHeight(); // 制造原始图片的像素数组，用一个int来代表每一个像素,按位表示方式是:0xAARRGGBB srcRgbImage = new int[imgWidth * imgHeight]; // 获取原始图片的所有像素，参见MIDP APPI文档 srcImage.getRGB(srcRgbImage, 0, imgWidth, 0, 0, imgWidth, imgHeight); shadowRgbImage = new int[srcRgbImage.length]; System.arraycopy(srcRgbImage, 0, shadowRgbImage, 0, shadowRgbImage.length); // 渐变图片的所有像素已开始都是全透明的 for (int i = 0; i < shadowRgbImage.length; i++) { shadowRgbImage[i] &= 0x00ffffff; } new Thread(this).start(); } public void paint(Graphics g) { g.setColor(0, 0, 0); g.fillRect(0, 0, w, h); // 绘制渐变图片 g.drawRGB(shadowRgbImage, 0, imgWidth, (w - imgWidth) / 2, (h - imgHeight) / 2, imgWidth, imgHeight, true); g.setColor(0, 255, 0); g.drawString("count=" + count, w / 2, 30, Graphics.HCENTER | Graphics.TOP); } public void run() { while (true) { boolean changed = false; // 改变渐变图片的每一个像素 for (int i = 0; i < shadowRgbImage.length; i++) { // 获取渐变图片的某一像素的alpha值 int alpha = (shadowRgbImage & 0xff000000) >>> 24; // 原始图片的对应像素的alpha值 int oldAlpha = (srcRgbImage & 0xff000000) >>> 24; if (alpha < oldAlpha) { // alpha值++ shadowRgbImage = ((alpha + 1) << 24) | (shadowRgbImage & 0x00ffffff); changed = true; } } try { Thread.sleep(10); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } count++; repaint(); // 当所有像素的alpha值都达到原始值后,线程运行结束 if (!changed) { System.out.println("over"); break; } } } }
更多阅读:
|
