import java.awt.*;
import java.lang.*;
import java.applet.*;
import java.awt.event.*;

public class Roller extends Applet implements ActionListener{
TextField r1suur = new TextField("30", 5);
TextField r2suur = new TextField("5", 5);
TextField kiirus = new TextField("30", 5);
TextField raskkiir = new TextField("2", 5);
TextField t1 = new TextField("Ratta suurus", 11);
TextField t2 = new TextField("Kivi suurus", 11);
TextField t3 = new TextField("Ratta kiirus", 11);
TextField t4 = new TextField("Raskuskiirendus", 11);
Button nupp = new Button("Valmis");
static int rad = 30;
static int rad2 = 5;
static int v = 30;
static int rk = 2;
int x, y;
int v0, vt0;
int temp;

	public void init(){
		add(r1suur);
		add(t1);
		t1.setEnabled(false);
		add(r2suur);
		add(t2);
		t2.setEnabled(false);
		add(kiirus);
		add(t3);
		t3.setEnabled(false);
		add(raskkiir);
		add(t4);
		t4.setEnabled(false);
		add(nupp);
		nupp.addActionListener(this);
	}


	public void paint(Graphics g){
	int i = 0;
		g.drawLine(0,300,600,300);		
		g.drawOval(590-2*rad, 300-2*rad, 2*rad, 2*rad);
		temp = (int)Math.sqrt((rad+rad2)*(rad+rad2)-(rad-rad2)*(rad-rad2));
		g.drawOval(590-rad-temp-rad2, 300-2*rad2, rad2*2, rad2*2);
		x = 590-rad-temp;
		y = 300-rad2;		
		fly(getGraphics());
		r1suur.setLocation(180,310);
		r2suur.setLocation(180,335);
		kiirus.setLocation(350,310);
		raskkiir.setLocation(350,335);
		nupp.setLocation(430,320);
		t1.setLocation(80, 310);
		t2.setLocation(80, 335);
		t3.setLocation(250, 310);
		t4.setLocation(250, 335);
	}
	
	public void fly(Graphics g) {
	int i = 0, xt = 0, yt = 0, x1, y1, m;
		vt0 = v*temp/(rad+rad2);
		v0 = v*(rad-rad2)/(rad+rad2);
		x1 = x-xt;
		y1 = y-yt;
		for (i = 0; i < x; i++){
			//s=v0*t
			xt = Math.round(v0*(i/10));
			//s=v0*t-(gt^2)/2	
			yt = Math.round((float)(vt0*(i/10) - Math.pow((i/10),2)*rk/2));
			g.drawLine(x - xt, y - yt, x1, y1);
			x1 = x-xt;
			y1 = y-yt;
		}
	
	
	
	}

	public void actionPerformed(ActionEvent e){	
	Integer tmp = new Integer(1);
		rad = tmp.parseInt(r1suur.getText());
		rad2 = tmp.parseInt(r2suur.getText());
		v = tmp.parseInt(kiirus.getText());
		rk = tmp.parseInt(raskkiir.getText());
		repaint();
	}

}