import java.awt.*;
import java.applet.*;

public class Figury extends  Applet {
    int width, height;
    public double fodx (double x) {
      double y;
      y = -0.1*(x+1)*(2-x)*(x-5);
          return y;
         }
    public void init () {
       //getContentPane().setLayout(null);
       width = 800;
       height = 600;
       setSize(width, height);
}
    public void paint(Graphics a) {
        a.setColor(new Color(0,0,0));
        a.drawLine (0, height / 2, width, height / 2);
        a.drawLine (width/2, 0, width/2, height);
        
                       int skala_ox;
            int y1 , y2;        
                skala_ox =5;                             
            for(int i=-20; i  < 20; i++){
               y1 = (int) fodx(i);
               y2 = (int) fodx(i+1);
              a.setColor(new Color(255,0,0));
              a.drawLine( i* skala_ox + (width /2 )  , -y1* skala_ox + (height / 2) , i* skala_ox + (width /2 )  , -y2* skala_ox + (height / 2));
        }

}

}

import java.awt.*;
import java.applet.*;

public class Figury extends  Applet {
    
    int width, height;
    
    public double fodx (double x) {
        double y;
        //y = -0.1*(x+1)*(2-x)*(x-5);
        //y = 1/5*x*(x+3)*(2-x)*(x+1);
        //  y=(x+1)/(3*x+6);
        //y = (3*x)/((x*x)-x+1);
        //y = Math.sin(x*Math.PI+100)+20;
        y= (x*x)-(3*x)+5;
        return y;
        
    }
    
    public void init () {
      
       //getContentPane().setLayout(null);
       width = 800;
       height = 600;
       setSize(width, height);
}
    
    public void paint(Graphics a) {
        a.setColor(new Color(0,0,0));
        
        a.drawLine (0, height / 2, width, height / 2);
        a.drawLine (width/2, 0, width/2, height);
        
        
            int skala_ox , zakres;
            double y1 , y2 ,x1 ,x2;        
             //skala_ox = height/((height/2)-(int)fodx(50));
             zakres = 20;
             skala_ox =15;         
                                 
                x1=(zakres*-1) * skala_ox + (width /2 );    
                y1=(fodx(zakres*-1)) * skala_ox + (height / 2);
        for(int i=zakres*(-1); i  < zakres;i=i+1){
                    //y1 = (int) fodx(i);
                    y2 =  fodx(i+1)* skala_ox + (height / 2);
                    x2 = i * skala_ox + (width /2 );
                        a.setColor(new Color(255,0,0));
                        //a.drawLine( (i)* skala_ox + (width /2 )  , -y1* skala_ox + (height / 2) , i* skala_ox + (width /2 )  , -y2* skala_ox + (height / 2));
                         a.drawLine( (int) x1  , (int) y1 , (int) x2  ,(int) y2);
                    x1= x2;
                    y1 = y2;
        }
        a.setColor(new Color(149,197,255));
        a.drawLine(0,(height / 2)-(1*skala_ox), width ,(height / 2) - (1*skala_ox));
        a.drawLine((1*skala_ox) + (width / 2), 0 ,(1*skala_ox) + (width / 2) ,height);
        /*    
            double i = -20;
            while (i < zakres)  {
                y1 = (int) fodx(i);
                y2 = (int) fodx(i+1);
                  a.setColor(new Color(255,0,0));
                a.drawLine( (int)i* skala_ox + (width /2 )  , -y1* skala_ox + (height / 2) , (int)i* skala_ox + (width /2 )  , -y2* skala_ox + (height / 2));
                i = i + 0.01;
            }
        */
}
}