Thread: Reading point objects from .drw file and drawing lines on panel

Hi!!
I am trying to read Point objects from square.drw file which contains endpoints of line segments, and draw lines making a square on panel when I run the program. This is what I have got so far. Could you please give some ideas on how to get the points using array for drawing ?

 
// Initializing fields
 
	private Point[] endPoints ;
        FileInputStream fos;
	ObjectInputStream oos;
        int sampleSize = 0;
 
/ Method to read Point objects from the square.drw file	
		public void readFile(File file)
	{
		try
		{
			fos = new FileInputStream("square.drw");
			oos = new ObjectInputStream(fos);
 
			while(fos.available() > 0)
			{
				oos.readObject();
			}
			//oos.close();
 
		}
 
		catch(ClassNotFoundException e)
		{
			JOptionPane.showMessageDialog(this, e.getMessage() , "can't read this file" , JOptionPane.ERROR_MESSAGE);
		}
		catch(IOException e)
		{
			JOptionPane.showMessageDialog(this ,  e.getMessage() , "Error opening file" , JOptionPane.ERROR_MESSAGE);
		}
 
	}
// method to insert those points in an array
		public void fillArray(File file) throws ClassNotFoundException
		{
			try
			{
				fos = new FileInputStream("square.drw");
				oos = new ObjectInputStream(fos);
 
				endPoints = new Point[sampleSize]; // creating an  object of Point class
			// Creating the Points to put in the array	(Deserialize the objects)
				for(int i = 0 ;  i < endPoints.length+1 ;  i++ )
				{
					endPoints[i] = (Point) oos.readObject(); 
					endPoints[sampleSize-i+1] = new Point(); // initializing the value before accessing it
				// now setting the values , since the point's aren't null
					endPoints[0].x = x1; // sample points
					endPoints[0].y = y1;
					endPoints[1].x = x2;
					endPoints[1].y = y2;
 
					    // how to initialize every point in the array using for??
				}
				//oos.close();
			}
 
			catch(IOException e)
			{
				JOptionPane.showMessageDialog(this ,  e.getMessage() , "Error opening file" , JOptionPane.ERROR_MESSAGE);
			}	
		}

public void paintComponent(Graphics g)
	{
		// draw parts of the drawing using lineColour
		super.paintComponent(g);
		//Point p = new Point[endPoints];
		int numPoints = endPoints.length;
		for(int i = 0; i < numPoints ; i++)
		{
 
			g.drawLine((int)x1, (int)y1, (int)x2, (int)y2);
		}
 
 
	}

Thanks . Today , finally I ended up managing to read Points objects from .drw file , store it in an arrayList and later iterate inside the paint Componenet as you said above and drawline using two endPoints as below:

ArrayList<Point> list = new ArrayList<Point>(); 
 
while(fis.available() > 0) 
{ 
Point p = (Point)ois.readObject(); 
list.add(p); 
}

// inside paintComponent(iterate through all the points and draw lines using two endPoints

for(int i = 0; i < getNumDraw() ; i++) 
{ 
p1 = endPoints[i]; 
p2 = endPoints[i+1]; 
 
g.drawLine((int)p1.x ,(int)p1.y , (int)p2.x , (int)p2.y);

Now, What I am trying is to set an ActionListener to the draw JButton when clicked, want it to perform the same action to draw a square .. Additionally, after that trying to use timer class and it's method to draw those lines one at a time so when you click the draw button , you can see drawing one line at a time but ending up with a square. If any idea please help. Sorry I tried to wrap the code but don't know where i made mistake.

If any idea please help

Can you post code that will compile and execute for testing?