cw2d.java.bak

samll awt programs for the beginner.

/**
* Author: Jing Han
* Date; 12/11/03
*Module: G6DICp
* Title: ICP Coursework 2
* SCSiT Username: jxh23m
*/


import java.io.*;
import java.awt.*;
import java.util.*;


class MainWindow extends Frame
{
    
    String title;
    Vector angle;
    
    public MainWindow()
    {
    	System.out.println("Entered MainWindow");
  		setLayout(null);
     	setSize(300,300);
     	setBackground(Color.gray);
     	setTitle("Pie Chart");
		angle = new Vector();          	
     	doStuff();
		
     } //end of mainwindow   

   
    private void doStuff()
    {
         //prompt for filename
        System.out.print("Enter data file:"+"  ");
        String filename=TButils.readln();
        
        //declare varialbe title and instantiate vector
        title = "";
        Vector data=new Vector();
        double sum=0;
        Integer myInteger;
        double datavalue; 
  
       //instantiate RandomAeccessFile. myData file is opened for reading
              
        try 
        {
            RandomAccessFile inFile=new RandomAccessFile(filename,"r");
            String line; //a string to contain the line read
            int lineNo=0;//initialise the line number of file
          /*----------------------------------------------------------------  
            *use the readLine method to read a line into the string line 
            until the end of the file
            *convert string line into Integer and cast Integer to vector object
            * use lineNo to track line number for seperate the title input from vector input
            *catch I/o error
            ---------------------------------------------------------------*/
            while((line=inFile.readLine())!=null) 
            {
               
                if( lineNo == 0 )
                {
                    title=line;
                 }
                 
                 else
                 {
                        myInteger=Integer.valueOf(line);    
                        datavalue=myInteger.doubleValue();   
                        sum=sum+datavalue;        
                    	data.addElement(myInteger); 
                  }
          
            
                lineNo++; 
       
            }//end of while loop 
         }// end of try 
         catch (IOException e)
         {
            System.out.println("An i/o error has occured ["+e+"]");
         }// end of catch exception

      
         
         System.out.println("Title:"+"  "+title);						
     	 System.out.println("     "+"Data"+"     "+"Angle(degree)");	//print out line of text

       /*---------------------------------------------------------------------------------
        *  instatiate new vector angle and delacare new variables
        * get number out of the vector data 
        * convert int number to double for calculation
        * cast the result double number to Double and put into vector angle
        ---------------------------------------------------------------------------------*/
        Integer tmpValue;     		  
 	    double value;           	  
	    double angleDouble;      	  
	    int angleInt;
	    Double myD;
		 
	
        for(int n=0;n<data.size();n++)
        {
            
           tmpValue=(Integer)data.elementAt(n);	
           value=tmpValue.doubleValue();				
           angleDouble=Math.round(360*value/sum);	
	      myD=new Double(angleDouble);
	      angleInt=myD.intValue();
	      angle.addElement(new Integer(angleInt));	
                 
         
         }// end of for loop 
     
         //print out data in two vectors
     	for(int n=0;n<angle.size();n++)
     	{
        	System.out.println("      "+data.elementAt(n)+"       "+angle.elementAt(n));
     	}//end of for loop 
     	
			   	
    }// end of doStuff
    
    
    public void paint(Graphics g)
    {
    	
        super.paint(g);
        
        // draw a circle

        // draw a yellow circle
        g.setColor(Color.yellow);    
        g.drawOval(100,60,100,100); // NB draw two concentric circles (to make it thick)
        g.drawOval(101,61,98,98);
            
        // write the message in white SansSerif bold 16
        g.setColor(Color.white);            
        g.setFont(new Font("SansSerif", Font.BOLD, 16));
        g.drawString(title,105,45);
        
        /*---------------------------------------------------------------------
		 *fill circle according to angle
		 split the circle and fill the color
		 *use for loop to change startArc and arcAngle
		 *Math.random method to get random color int number
         ---------------------------------------------------------------------*/
        int startAngle=0;
        int tmpArc;
        int a;
        int b;
        int c;
        Double tempA;
        Double tempB;
        Double tempC;
        
        
        for(int n=0;n<angle.size();n++)
        {
		 tempA = new Double(Math.random()*255);
         	 a = tempA.intValue();
        	 tempB = new Double(Math.random()*255);
        	 b = tempB.intValue();
        	 tempC = new Double(Math.random()*255);
         	 c = tempC.intValue();
        
        	tmpArc=((Integer)angle.elementAt(n)).intValue();
        	g.setColor(new Color(a,b,c));
        	g.fillArc(100,60,100,100,startAngle,tmpArc);
                startAngle=tmpArc+startAngle;
            
        }
        
    }//end of paint
    
    
}//end of mainwindow class


class cw2d
{
    public static void main(String args[])
    {
    	MainWindow myWindow=new MainWindow();
     	myWindow.show();
    }
}