/**************************************************************************/
//klasa Program
package coaAWT;
import java.awt.*;
import java.awt.event.*;

public class Program extends Frame {
    Panel p1,p2,p3,p4;
    TextField[] txt=new TextField[3];
    Crtez c;
    Program(){
        setBounds(100,100,500,600);
        this.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                dispose();
            }
        });

        this.setLayout(new GridLayout(2,1));

        p1=new Panel();
        p1.setLayout(new GridLayout(1, 1));
        p2=new Panel();

        p2.add(new Label("tmin,tmax,dt:"));
        p2.add(txt[0]=new TextField("0"));
        p2.add(txt[1]=new TextField("10"));
        p2.add(txt[2]=new TextField("0.01"));

        c=new Crtez(new Spirala(0.5,1,0),Color.RED,Double.parseDouble(txt[0].getText()),Double.parseDouble(txt[1].getText()),Double.parseDouble(txt[2].getText()));
        c.setBackground(Color.orange);
        txt[0].addActionListener(new ActionListener() {

                public void actionPerformed(ActionEvent e) {
                    c.setminT(Double.parseDouble(txt[0].getText()));
                    repaint();

                }
        });
        txt[1].addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {

                c.setmaxT(Double.parseDouble(txt[1].getText()));
                repaint();
            }
        });
        txt[2].addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                c.setKorak(Double.parseDouble(txt[2].getText()));
                repaint();
            }
        });
        p1.add(c);

        add(p2);
        add(p1);


        setVisible(true);
    }
    public static void main(String[] args) {
        new Program();
    }

}
/**************************************************************************/
//Klasa Crtez
package coaAWT;

import java.awt.*;
import java.awt.event.*;

@SuppressWarnings("serial")
public class Crtez extends Canvas {

    private Kriva kriva;
    private Color boja;
    private double minT, maxT, korak;

    public Crtez(Kriva k, Color b, double m, double mx, double kk) {
        kriva = k;
        boja = b;
        minT = m;
        maxT = mx;
        korak = kk;
        repaint();
    }

    public void paint(Graphics g) {

        g.drawString("PISEM PISEM PISEM", 100, 100);

        g.setColor(boja);
        double start = minT;
        double end = maxT;
        int x1, x2, y1, y2;
        Tacka t1 = kriva.izracunaj(start);
        x1 = (int) ((t1.getX()+10)*getWidth()/20);
        y1 = (int) ((10 - t1.getY())*getHeight()/20);

        while (start < end) {
            Tacka t2 = kriva.izracunaj(start);
            start += korak;
            x2 = (int) ((t2.getX()+10)*getWidth()/20);
            y2 = (int) ((10 - t2.getY())*getHeight()/20);
            g.drawLine(x1, y1, x2, y2);
            x1 = x2;
            y1 = y2;
        }

    }

    public void setminT(double m) {
        minT = m;
        repaint();
    }

    public void setmaxT(double m) {
        maxT = m;
        repaint();
    }

    public void setKorak(double m) {
        korak = m;
        repaint();
    }

    public void setBoja(Color b) {
        boja = b;
        repaint();
    }

}