/*
<applet codebase = "." code = "ciips.animation.AlgAnimApp.class" width = 300 height = 55>
<param name = "filename" value = "ConvexHullAlgThread.java">
<param name = "buttonname" value = "Click to run Chain Hull Algorithm Animation">
<param name = "algname" value = "ConvexHull">
<param name = "algfile" value = "con"> 
</applet>
*/

/* ConvexHullAlgThread.java */

import java.awt.*;
import java.io.*;
import java.net.*;
import java.util.*;
import ciips.animation.*;
import ciips.animation.graph.*;

public class ConvexHullAlgThread extends AlgThread {
	static int max_data = 20; //20 Points
	static String[] dataSets = {"Data 1", "Data 2"};
	static String[] options = { "" };
	private static String base_data_file_name = "con";

	Point source[] = new Point[max_data];

	AlgAnimFrame frame;
	DrawingPanel drawing_panel;
	int delay = 2000;
	static int N_HISTORY_PANELS = 2;

	static { AlgAnimFrame.COMPANEL_LINES = 5; }
	static { ciips.animation.UIFrame.allowUI( false ); }

	public ConvexHullAlgThread( AlgAnimFrame frame ) {
		super();
		setParms( frame, N_HISTORY_PANELS );
		this.frame = frame;
		int first = 0;
		System.out.println("ConvexHullAlgThread : super called");
		System.out.flush();

		if (frame != null &&  drawing_panel != null) {
			// graph_panel already created -> this constructor called from
			// clicking the run button -> use the generated data set
	 		} 
		else {
	 		// this constructor called from AlgAnimFrame constructor
			// Ensures that graph is created
			// init( frame.algfile+first ); 
		 	}
		System.out.println("ConvexHullAlgThread : cons complete");
		
		System.out.flush();

	}

	public boolean loadData(int choice)
	{
		System.out.println("ConvexHullAlgThread :loadData choice " + choice );
	 	String fn = base_data_file_name + choice;
		init( fn );
		return false;
	}

	public void init( String fn )
	{
		System.out.println("ConvexHullAlgThread:init fn [" + fn + "]" );
	
		InputStreamReader ins_r = null;
		
		try {
			
			
			URL dataURL = new URL(frame.getApplet().getCodeBase(), fn);
			ins_r = new InputStreamReader(dataURL.openConnection().getInputStream());
			
			BufferedReader br = new BufferedReader( ins_r );

			String line;
			String item1, item2;
			int source_x;
			int source_y;

			Point source_p;

			int index =0;
			
			if ((line = br.readLine()) != null)
			{
				System.out.println(line);
				StringTokenizer Data = new StringTokenizer(line, " ");

				while( (line = br.readLine() ) != null ) 
				{
					Data = new StringTokenizer(line, " ");
					item1 = Data.nextToken();
					item2 = Data.nextToken();

					source_x = Integer.parseInt(item1);
					source_y = Integer.parseInt(item2);

					source_p = new Point(source_x, source_y);

					source[index] = source_p;
					System.out.println("Point : " + source[index].x +" "+ source[index].y);

					index++;
				}
			}
				
			System.out.println("ConvexHullAlgThread : init cons");

		//	graph_panel.setGraph( graph );
		//  graph_panel.repaint();
		//	frame.getCurrentPanel().addDrawingObj( graph );
		} 
		
		catch (Exception e)
		{
			System.out.println("ConvexHullAlgThread : init - file [" + fn + "] I/O error");
			System.out.println(" " + e.getClass().getName() + " (" + e.getMessage() + ")");			
		}
	}



	public void run()
	{
		// int choice = frame.getDataChoice();
		if ( drawing_panel == null )
		{
			drawing_panel = new DrawingPanel ();
			drawing_panel = frame.getCurrentPanel();
		}
	
		generateData();

		StackConvex chainconvex = new StackConvex(  this , drawing_panel );

		int number;
		number = chainconvex.ChainHull_2D( source , max_data );
		
	
		for ( int i=0 ; i < number ; i++ )
		{
			System.out.println(chainconvex.H[i].x+" "+chainconvex.H[i].y);
		}
		
		frame.finishAlg();
		drawing_panel.repaint();
	}

	public void restoreDrawingPanelColor()
	{
	
	}
}