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

public class DistPanel extends JPanel {
    int x = 0;
    double min = Double.MAX_VALUE;
    double max = 0;
    double maxvahe = 0;
    double eelmine = -1;
    Vector p = null;
    double vahem = 2;
    public void paintComponent(Graphics g) {
        super.paintComponent(g); //paint background
	//Insets insets = getInsets();
	//int currentWidth = getWidth() - insets.left - insets.right;
	//int currentHeight = getHeight() - insets.top - insets.bottom;

        //Draw image at its natural size first.
	g.setColor(Color.yellow);
	g.fillRect(0, 0, getWidth(), getHeight());

	g.setColor(Color.blue.darker());
	g.drawLine(20, getHeight() - 20, 20, 20);
	g.drawLine(10, 20, 30, 20);
	g.drawString("1.0", 2, 31);
	g.drawLine(10, getHeight()/2 , 30, getHeight()/2 );
	g.drawString("0.5", 2, getHeight()/2+11);
	g.drawLine(10, getHeight()/4+10 , 30, getHeight()/4+10 );
	g.drawLine(10, 3*getHeight()/4-10 , 30, 3*getHeight()/4 -10);
	g.drawLine(20, getHeight() -20, getWidth()-20, getHeight()-20);
	g.drawString("0.0", 2, getHeight()-20);

	g.drawLine((getWidth()-20)/2+10, getHeight() -10, (getWidth()-20)/2+10, getHeight()-30);
	g.drawLine(getWidth()-20, getHeight() -10, getWidth()-20, getHeight()-30);


	if (x != 0) {
	    g.drawString((new Double(min)).toString(), 10, getHeight()-7);
	    g.drawString((new Double(max/2)).toString(), getWidth()/2-65, getHeight()-7);
	    g.drawString((new Double(max)).toString(), getWidth()-65, getHeight()-7);
	    // Joonistame pikkuste jaotuse Histogrammina
	    double kursor = min;
	    int c = 0;
	    maxvahe = (max-min)/(((double)x)/vahem);
	    double[] vahemikes = new double[(int)((x/vahem)+1)];
	    while(c < vahemikes.length) {
		vahemikes[c] = 0;
		vahemikes[c] = loendaFaileVahemikus(kursor, kursor+maxvahe);
		kursor += maxvahe;
		c++;
	    }

	    int rectX = 20;
	    int deltaX = (getWidth()-40)/vahemikes.length;
	    for(int i = 0; i < vahemikes.length; i++) {
		int y = (int)( ((double)(getHeight()-40)/(double)x) * vahemikes[i]);
		int startY = getHeight() -20 - y;
		g.fillRect(rectX,startY,deltaX, y  );
		rectX += deltaX;
		//g.drawString((new Integer(y)).toString(), 100, 80+i*20);
		//g.drawString((new Double(vahemikes[i])).toString(), 100, 80+i*20);
	    }
	}
	g.setColor(getForeground());
    }

    public void setVahem(int v) {
	vahem = (double)v;
    }

    public void setPoints(Vector points) {
        min = Double.MAX_VALUE;
        max = 0;
        maxvahe = 0;
        eelmine = -1;

	x = points.size();
	Collections.sort(points);
	for(int i = 0; i < points.size(); i++) {
	    double l = ((Double)points.elementAt(i)).doubleValue();
	
	    if (min >= l) min = l;
	    if (max <= l) max = l;
	    if (i == 1){
		maxvahe = Math.abs(l-eelmine);
	    } else {
		double v = Math.abs(l-eelmine);
		if (v > maxvahe) {
			maxvahe = v;
		}
	    }
	    eelmine = l;
        }
	// Liidame igaks juhuks ühe juurde, et iga vahemik sisaldaks mõne
	// faili pikkust
	maxvahe = maxvahe+1;
	p = points;
	if (min == max) max++;
    }
    private double loendaFaileVahemikus(double start, double end) {
	int count = 0;
	for(int i = 0; i < p.size(); i++) {
	    double l = ((Double)p.elementAt(i)).doubleValue();
	    if (l < end) {
		if (l >= start) {
		    count++;
		}
	    } else {
		break;
	    }
	}
	return (double)count;
    }
}