uni/inf2440/hw4/TegnUt.java

import java.util.*;
import javax.swing.*;
import java.awt.*;

/**
 * Klasse for aa tegne et punktsett med n punkter (Helst n < 200)  og
 * den konvekse innhyllinga i IntList CoHull, koordinatene i d.x[] og d.y[]
 * ver 7.mai 2015, 2016,2017
 ******************************************************************************/
class TegnUt extends JFrame{
	Oblig4 d;
	IntList theCoHull;
	int n, MAX_Y;
	int [] x,y;

	TegnUt(Oblig4 d, IntList CoHull, String s ){
		theCoHull = CoHull;
		this.d =d;
		x = d.x;
		y = d.y;
		n = d.n;
		MAX_Y = d.MAX_Y;
		size = 500;
		margin = 50;
		scale =size/d.MAX_X +0.8;
		setTitle("Oblig4, num points:"+n+" "+s);
		grafen = new Graph();
		getContentPane().add(grafen, BorderLayout.CENTER);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		pack();
		setVisible(true);
		// angir foretrukket storrelse paa dette lerretet.
		setPreferredSize(new Dimension(d.MAX_X+2*margin,d.MAX_Y+2*margin));
	}

	Graph grafen;
	int size , margin;
	double scale ;

	class Graph extends JPanel   {
		void drawPoint(int p, Graphics g) {
			int SIZE =7;
			if (n <= 50) g.drawString(p+"("+x[p]+","+y[p]+")",xDraw(x[p])-SIZE/2,yDraw(y[p])-SIZE/2);
			else if (n <= 200)g.drawString(p+"",xDraw(x[p])-SIZE/2,yDraw(y[p])-SIZE/2);
			g.drawOval (xDraw(x[p])-SIZE/2,yDraw(y[p])-SIZE/2,SIZE,SIZE);
			g.fillOval (xDraw(x[p])-SIZE/2,yDraw(y[p])-SIZE/2,SIZE,SIZE);
		}

		Graph() {
			setPreferredSize(new Dimension(size+2*margin+10,size+2*margin+10));
		}

		int  xDraw(int x){return (int)(x*scale)+ margin ;}
		int  yDraw(int y){return (int)((MAX_Y-y)*scale+margin);}

		public void paintComponent(Graphics g) {
			super.paintComponent(g);
			g.setColor(Color.black);
			for (int i = 0; i < n; i++){
				drawPoint(i,g);
			}
			g.setColor(Color.red);
			// draw cohull
			int x2 = x[theCoHull.get(0)], y2 = y[theCoHull.get(0)],x1,y1;
			for (int i = 1; i < theCoHull.size(); i++){
				y1 = y2; x1=x2;
				x2 = x[theCoHull.get(i)];
				y2 = y[theCoHull.get(i)];
				g.drawLine (xDraw(x1),yDraw(y1), xDraw(x2),yDraw(y2));
			}

			g.drawLine (xDraw(x[theCoHull.get(theCoHull.size()-1)]),
					yDraw(y[theCoHull.get(theCoHull.size()-1)]),
					xDraw(x[theCoHull.get(0)]),yDraw(y[theCoHull.get(0)]));
		} // end paintComponent

	}  // end class Graph
}// end class DT