package multimediademo;

import java.net.*;
import java.applet.*;
import java.applet.Applet;
import java.awt.image.*;
import java.awt.*;
import multimediademo.ImageFilter;
import javax.swing.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class DemoThread extends Thread{
  //********************************類變量**********************************
  //四個私有變量：滾動面板對象、圖像類對象、圖形對象和動畫類型值
  private JScrollPane m_scroll;
  private Image sourceImage, filteredImage;
  private Graphics m_graph;
  //1表示縮放平移動畫，2表示不擦除平移動畫，3表示淡入淡出動畫
  private int m_demoType;
  //申明一個圖像過濾器
  ImageFilter imageFilter;
  //定義初始點
  int startX = 50;
  int startY = 50;
  boolean REPAINT_MARK;
  int imageWidth,imageHeight;
  int panelWidth,panelHeight;
  int m_imageWidth,m_imageHeight;
  int STEP = 10;
  //********************************類方法**********************************
  //默認構造函數
  public DemoThread() {
  }
  //重載構造函數
  public DemoThread(Image image,JScrollPane scrollPanel,int demoType){
    //給私有變量賦值
    sourceImage = image;
    filteredImage = image;
    m_scroll = scrollPanel;
    m_demoType = demoType;
    //獲取圖形對象
    m_graph = m_scroll.getGraphics();
    //獲取面板對象和圖像的尺寸
    imageWidth = filteredImage.getWidth((Component)m_scroll);
    imageHeight = filteredImage.getHeight((Component)m_scroll);
    panelWidth = m_scroll.getWidth();
    panelHeight = m_scroll.getHeight();
  }
  //重載線程操作函數
  public void run(){
    initializeRun();
    //moveDirect表示圖像水平移動的方向：取true表示由左向右移動，false則表示相反的方向
    boolean moveDirect = true;
    while(true){
       //畫動畫的第一副圖像
      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;
      }
      //畫動畫的其他圖像：
      //m_demoType表示動畫類型，1表示縮放平移動畫，2表示不擦除平移動畫，3表示淡入淡出動畫
      else{
        switch (m_demoType) {
          //水平移動縮放動畫
          case 1:
            if(moveDirect){    //圖像由左向右移動并縮小
              m_graph.clearRect(startX, startY, m_imageWidth, m_imageHeight);
              startX += STEP;
              //判斷動畫移動是否反向
              if ((startX + m_imageWidth) > panelWidth) {
                startX -= STEP;
                moveDirect = false;
              }
              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);
              }
            }
            //圖像由右向左移動并放大
            else{
              m_graph.clearRect(startX, startY, m_imageWidth, m_imageHeight);
              startX -= STEP;
              //判斷動畫移動是否反向
              if(startX < 10){
                moveDirect = true;
                startX += STEP;
              }
              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;
          //不擦除平移動畫
          case 2:
            //不擦除顯示動畫
            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;
              }
            }
            //逐一擦除圖像
            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 < 0){
                //擦除完所有圖像后，在顯示第一副圖像前停留1秒后畫第一副圖像
                try{
                  Thread.sleep(1000);
                }
                catch(InterruptedException e)
                {}
                moveDirect = true;
                startX = 10;
                m_imageWidth = 200;
                m_imageHeight = 200;
                startY = (panelHeight - m_imageHeight)/2;
                m_graph.drawImage(filteredImage,startX,startY,m_imageWidth,
                                  m_imageHeight,m_scroll);
              }
            }
            break;
          //淡入淡出動畫
          case 3:
            imageFilter.pixelValueChange();
            filteringImage();
            m_graph.drawImage(filteredImage,startX,startY,m_imageWidth,
                              m_imageHeight,m_scroll);
            break;
          //缺省狀態直接返回
          default:
            break;
        }
        try {
          Thread.sleep(1000);
        }
        catch (InterruptedException e) {}
      }
    }
  }
  //圖像過慮函數
  private void filteringImage(){
    ImageProducer producer = sourceImage.getSource();
    producer = new FilteredImageSource(producer,imageFilter);
    filteredImage = m_scroll.createImage(producer);
  }
  //初始化線程運行參數函數
  public void initializeRun(){
      m_imageWidth = imageWidth;
      m_imageHeight = imageHeight;
      if(m_imageWidth > 200)
        m_imageWidth = 200;
      if(m_imageHeight > 200)
        m_imageHeight = 200;
      //m_demoType表示動畫類型，1表示縮放平移動畫，2表示不擦除平移動畫，3表示淡入淡出動畫
      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 = 400;
          m_imageHeight = 400;
          startX = (panelWidth - m_imageWidth)/2;
          startY = (panelHeight - m_imageHeight)/2;
          break;
      }
      m_graph.clearRect(0,0,panelWidth,panelHeight);
      REPAINT_MARK = false;
  }
}