import java.awt.*;

public class catmuller extends BufferedApplet
{
   int w = 0, h;
   int selected=1;
   Cubic xspline[]=new Cubic[13];
   Cubic yspline[]=new Cubic[13];
   double GX[] = {130,120,110,100,110,120,130,140,150,160,150,140,130,120,110,120};
   double GY[]=  {100,110,120,130,140,150,160,150,140,130,120,110,100,110,120,130};
   double min;
   double distance=0;
   public void init(){
         w = bounds().width;
         h = bounds().height;      
    }
    
   public void render(Graphics g) {
     
     for(int i=0;i<11;i++){
         double xcoords[]= {GX[i],GX[i+1],GX[i+2],GX[i+3]};
         double ycoords[]= {GY[i],GY[i+1],GY[i+2],GY[i+3]};
         xspline[i]=new Cubic(Cubic.CATMULL_ROM,xcoords);
         yspline[i]=new Cubic(Cubic.CATMULL_ROM, ycoords);
         
    }
      // DRAW THE SPLINE
g.setColor(Color.white);
g.fillRect(0,0,w,h);
      g.setColor(Color.black);
      g.drawOval((int)GX[selected]-5,(int)GY[selected]-5,10,10);
      for(int i=0;i<11;i++){
          for (double t = 0 ; t < 1 ; t+=.01) {
              int y = (int)(yspline[i].eval(t));
              int x=(int)(xspline[i].eval(t));
              int y2 = (int)(yspline[i].eval(t+.01));
              int x2=(int)(xspline[i].eval(t+.01));
              int tcoord=(int)(t*100);
             /* g.setColor(Color.red);
              g.drawLine(tcoord+100*i,x,tcoord+100*i+1,x);
              g.setColor(Color.blue);
              g.drawLine(tcoord+100*i,y,tcoord+100*i+1,y);
              */
             g.drawOval((int)GX[i]-2,(int)GY[i]-2,4,4);
              g.setColor(Color.black);
              g.drawLine(x,y,x2,y2);
            }
        }
   }

   // RESPOND TO USER INPUT

   public boolean mouseUp(Event e, int x, int y) {
       min=100;
       for(int d=1;d<13;d++){
           distance=Math.sqrt((x-GX[d])*(x-GX[d]) + (y-GY[d])*(x-GX[d]));
           if (distance<20  && distance<=min){
                min=distance;
                selected=d;
            }
        }
return true;
   }

   public boolean mouseDrag(Event e, int x, int y) {
           GX[selected]=x;
           GY[selected]=y;
           damage=true;
      return true;
   }
}