/*************************
會考題第六題：BMP轉ASCII圖檔
**************************/
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
public class b6 extends JFrame //畫圖物件是JFrame的擴充
{
    Container c;
    Color bgcolor=Color.white;
    Color textcolor=Color.red;
    JButton rot0,rot1;
    JLabel lab1=new JLabel("來源檔名：");
    JLabel lab2=new JLabel("ASCII檔名：");
    imgZ1 Z1= new imgZ1();
    JTextField text_s,text_d;
    public b6()   //建構元
    {
	super("轉換ASCII圖形");
        c=getContentPane();
	rot1=new JButton("轉換");
	rot0=new JButton("結束");
	text_s=new JTextField("source file",10);
	text_d=new JTextField("Dest file",10);
	setSize(400,300);
	c.setLayout(new FlowLayout(FlowLayout.CENTER));
	c.add(lab1);
	c.add(text_s);
	c.add(lab2);
	c.add(text_d);
	c.add(rot1);
	c.add(rot0);
	rot0.addActionListener(Z1);
	rot1.addActionListener(Z1);
	show();
    }
    public void paint(Graphics g)  //真正的畫圖設定
    {
	super.paint(g);
	
    }
  class imgZ1 implements ActionListener
  {
      int data[][][]=new int[300][300][3];//300*300*3 integer
      char ndata[][]=new char[100][100];//step must larger than 3
      int row_num=0,col_num=0;
      byte header[]=new byte[54];//54位元表頭
    public void file_read() throws IOException //讀取bmp檔
     {
	int x,y,k;
	RandomAccessFile fr=new RandomAccessFile(text_s.getText(),"r");//開檔
	fr.read(header,0,54);//跳過表頭
	for (y=0;y<300;y=y+1)
		for (x=0;x<300;x=x+1)
		     for (k=0;k<3;k=k+1)
			data[y][x][k]=fr.readUnsignedByte();//讀三元色，並且處理補數問題
	fr.close();
     }
     public void actionPerformed(ActionEvent e) 
     { int x,y,i,j,k;
       byte tmp;
       final int step=10;
       long sum;
       char oc;
         if (e.getSource()==rot0)//結束
	  {
	     System.exit(0);
	  }
	     try {file_read();}
	     catch(IOException e1)
	     {
		     System.out.println(text_s.getText()+"Reading Error!");
	     }
	/***透過檢查那個按鈕呼叫的，就可以判定該做的動作 ***/
        if (e.getSource()==rot1)//轉換ASCII碼
	{
	     row_num=0;
	     for (y=0;y<300;y=y+step)
             {
	       col_num=0;
	       	for (x=0;x<300;x=x+step)//針對每個block
		{
		     sum=0;
		     //計算方塊內的圖素總和
		      for (j=y;j<y+step;j=j+1)
			      for (i=x;i<x+step;i=i+1)
			   	     for (k=0;k<3;k=k+1)
					     sum=sum+data[j][i][k];
		     sum=(sum/step/step/3);//計算大略的灰階
		     oc=0;
		     //轉換成對應字元
		     if (sum<=31 && sum>=0) oc='@';
		     else if (sum<=63 && sum>=32) oc='M';
		     else if (sum<=95 && sum>=64) oc='W';
		     else if (sum<=127 && sum>=96) oc='N';
		     else if (sum<=159 && sum>=128) oc='X';
		     else if (sum<=191 && sum>=160) oc='I';
		     else if (sum<=223 && sum>=192) oc='*';
		     else if (sum<=255 && sum>=224) oc='.';
		     else System.out.println(sum);
		     ndata[row_num][col_num]=oc;
		     col_num=col_num+1;
		}//for x
		row_num=row_num+1;
	     }//for y
	}
	
	try {//寫入文字檔
		FileWriter fw=new FileWriter(text_d.getText());
		BufferedWriter bfw=new BufferedWriter(fw);
		for (i=row_num-1;i>=0;i=i-1)
		{
			bfw.write(ndata[i],0,col_num);
			bfw.newLine();
		}
		bfw.flush();
		fw.close();
	}
	     catch(IOException e1)
	     {
		     System.out.println(text_d.getText()+"Open Error!");
	     }

	repaint(); //重新顯示一次
     }
  }
    public static void main(String args[]) //程式起點
    {
	b6 app=new b6(); //啟動物件
	app.addWindowListener(new WindowAdapter(){ //匿名內部類別
	public void windowClosing(WindowEvent e)
		{
			System.exit(0);
		}
	}); //處理視窗關閉要求
    }
}