JAVA多线程demo.doc

package multimediademo;import .*;import java.applet.*;import java.applet.Applet;import java.awt.image.*;import java.awt.*;import multimediademo.ImageFilter;import javax.swing.*;/* * Title: * Description: * Copyright: Copyright (c) 2003 * Company: * author not attributable * version 1.0 */public class DemoThread extends Thread /*类变量* /四个私有变量：滚动面板对象、图像类对象、图形对象和动画类型值 private JScrollPane m_scroll; private Image sourceImage, filteredImage; private Graphics m_graph; /1表示缩放平移动画，2表示不擦除平移动画，3表示淡入淡出动画 private int m_demoType; /申明一个图像过滤器 /ImageFilter imageFilter; /定义初始点 int startX = 50; int startY = 50; boolean REPAINT_MARK; int imageWidth,imageHeight; int panelWidth,panelHeight; int m_imageWidth,m_imageHeight; int STEP = 10; /*类方法* /默认构造函数 public DemoThread() /重载构造函数 public DemoThread(Image image,JScrollPane scrollPanel,int demoType) /给私有变量赋值 sourceImage = image; filteredImage = image; m_scroll = scrollPanel; m_demoType = demoType; /获取图形对象 m_graph = m_scroll.getGraphics(); /获取面板对象和图像的尺寸 imageWidth = filteredImage.getWidth(Component)m_scroll); imageHeight = filteredImage.getHeight(Component)m_scroll); panelWidth = m_scroll.getWidth(); panelHeight = m_scroll.getHeight(); /重载线程操作函数 public void run() initializeRun(); /moveDirect表示图像水平移动的方向：取true表示由左向右移动，false则表示相反的方向 boolean moveDirect = true; while(true) /画动画的第一副图像 if(!REPAINT_MARK) m_graph.drawImage(filteredImage,startX,startY,m_imageWidth,m_imageHeight,m_scroll); try Thread.sleep(1000); catch(InterruptedException e) REPAINT_MARK = true; /画动画的其他图像： /m_demoType表示动画类型，1表示缩放平移动画，2表示不擦除平移动画，3表示淡入淡出动画 else switch (m_demoType) /水平移动缩放动画 case 1: if(moveDirect) /图像由左向右移动并缩小 m_graph.clearRect(startX, startY, m_imageWidth, m_imageHeight); startX += STEP; /判断动画移动是否反向 if (startX + m_imageWidth) panelWidth) startX -= STEP; moveDirect = false; m_graph.clearRect(startX, startY, m_imageWidth, m_imageHeight); try Thread.sleep(1000); catch(InterruptedException e) else m_imageWidth = (int) (m_imageWidth * 0.9); m_imageHeight = (int) (m_imageHeight * 0.9); startY = (panelHeight - m_imageHeight) / 2; m_graph.drawImage(filteredImage, startX, startY, m_imageWidth, m_imageHeight, m_scroll); /图像由右向左移动并放大 else m_graph.clearRect(startX, startY, m_imageWidth, m_imageHeight); startX -= STEP; /判断动画移动是否反向 if(startX 10) moveDirect = true; startX += STEP; m_graph.clearRect(startX, startY, m_imageWidth, m_imageHeight); else m_imageWidth = (int) (m_imageWidth / 0.9); m_imageHeight = (int) (m_imageHeight / 0.9); startY = (panelHeight - m_imageHeight) / 2; m_graph.drawImage(filteredImage, startX, startY, m_imageWidth, m_imageHeight, m_scroll); break; /不擦除平移动画 case 2: /不擦除显示动画 if(moveDirect) STEP = m_imageWidth + 10; startX += STEP; if ( (startX + m_imageWidth) = panelWidth) m_imageWidth = (int) (m_imageWidth * 0.9); m_imageHeight = (int) (m_imageHeight * 0.9); startY = (panelHeight - m_imageHeight) / 2; m_graph.drawImage(filteredImage, startX, startY, m_imageWidth, m_imageHeight, m_scroll); else startX -= STEP; moveDirect = false; /逐一擦除图像 else m_graph.clearRect(startX-10,startY-10,m_imageWidth+15, m_imageHeight+15); m_imageWidth = (int) (m_imageWidth / 0.9) ; m_imageHeight = (int) (m_imageHeight / 0.9); startY = (panelHeight - m_imageHeight) / 2; STEP = m_imageWidth + 10; startX -= STEP; if(startX 200) m_imageWidth = 200; if(m_imageHeight 200) m_imageHeight = 200; /m_demoType表示动画类型，1表示缩放平移动画，2表示不擦除平移动画，3表示淡入淡出动画 switch(m_demoType) case 1: startX = 10; startY = (panelHeight - m_imageHeight)/2; STEP = 50; break; case 2: startX = 10; startY = (panelHeight - m_imageHeight)/2; break; /* case 3: imageFilter = new ImageFilter(); m_imageWidth