/*****************************************
示範BufferedImage用法
*************************************************/
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
//想想還有沒有其他的東西要import
import java.awt.image.*;
import javax.imageio.*;
public class ui42 extends JFrame implements ActionListener
{
    Container c;
    //設定UI元件
    JTextField txt1,txt2;
    JButton bot1,bot2;
    BufferedImage bi;
    JLabel lab;
    //設定共用的變數與類別
    public ui42()   //建構元，名稱改一改
    {
        super("ImageIO"); 
        //初始化共用變數
        c=getContentPane();//取得ContentPane
        //設定版面設定
        c.setLayout(new FlowLayout());
        //初始化UI元件
        txt1=new JTextField(8);
        txt2=new JTextField(8);
        bot1=new JButton("讀取並分析");
        bot2=new JButton("寫出");
        lab=new JLabel();
        //將UI元件加入ContentPane
        c.add(txt1);c.add(bot1);c.add(txt2);c.add(bot2);c.add(lab);
        //設定UI元件與滑鼠的事件觸發傾聽者
        bot1.addActionListener(this);
        bot2.addActionListener(this);
        setSize(640,480);//設定size，顯示出去
        setVisible(true);
    }
    public void paint(Graphics g)  
    {
	    super.paint(g);//畫出元件
	    //額外的畫圖程式寫在這裡
        if (bi!=null)
            g.drawImage((Image)bi,0,100,null);
    }
    //UI元件事件處理類別寫在這裡
    public void actionPerformed(ActionEvent e)
    {
        int x,y,W,H,color,R,G,B,Rcnt=0,Gcnt=0,Bcnt=0;
        if (e.getSource()==bot1)
        {
            try 
            {
                bi=ImageIO.read(new File(txt1.getText()));
                W=bi.getWidth();
                H=bi.getHeight();
                for (y=0;y<H;y=y+1)
                    for (x=0;x<W;x=x+1)
                    {
                        color=bi.getRGB(x,y);
                        R=color>>16&0xff;
                        G=color>>8&0xff;
                        B=color&0xff;
                        if (R>G&&R>B)
                        {
                            Rcnt=Rcnt+1;
                            color=255<<16|0<<8|0;
                        }
                        else   if (G>R&&G>B)
                        {
                            Gcnt=Gcnt+1;
                            color=0<<16|255<<8|0;
                        }
                        else   if (B>R&&B>G)
                        {
                            Bcnt=Bcnt+1;
                            color=0<<16|0<<8|255;
                        }
                        bi.setRGB(x,y,color);
                    }
                    lab.setText("R:"+Rcnt+" G:"+Gcnt+" B:"+Bcnt);
            }
            catch (Exception ee)
            {
                System.out.println(ee.toString());
            }
        }
        else if (e.getSource()==bot2)
        {
            try 
            {
                ImageIO.write(bi,"jpg",new File(txt2.getText()));
            }
            catch (Exception ee)
            {
                System.out.println(ee.toString());
            }
        }
        repaint();
    }
    //滑鼠事件處理類別寫在這裡
  /***主程式***/
    public static void main(String args[]) //程式起點
    {
        ui42 app=new ui42(); //名稱改一改，啟動UI元件
        app.addWindowListener(new WindowAdapter(){ 
            public void windowClosing(WindowEvent e)
            {
                System.exit(0);
            }
        }); //處理視窗關閉要求
    }
}