float fi=0;
float x,y,z,r;
int i,j,k;
float angle=0;

int NSEGMENTS=4000;
int N=40;
int M=18;
int SPHEREN = 16;
float r2 = 0.15;

void setup() 
{
  size(400, 400,P3D);
  colorMode(RGB,200);
}


void DrawKnot1()
{
  int i;
  float x,y,z,xl,yl,zl;
  float x2,y2,z2;
  float mu;
  float r=0;
  float beta;
  float mx=mouseX;
  float my=mouseY;
  float phi,theta;
  float nlongitude=mx/40;
  float nmeridian=my/40;
 
  zl=yl=xl=-255;

  beginShape(LINES);
  for (i=0;i<=NSEGMENTS;i++) {

      mu = i * TWO_PI * nmeridian / (float)NSEGMENTS;
      x = cos(mu) * (1 + cos(nlongitude*mu/(float)nmeridian) / 2.0);
      y = sin(mu) * (1 + cos(nlongitude*mu/(float)nmeridian) / 2.0);

      z = sin(nlongitude*mu/(float)nmeridian) / 2.0;


       if (zl==-255) {
         xl=x;
         yl=y;
         zl=z;
       }
      stroke(200,100,0,mu*5);       
      vertex(x,y,z);
      vertex(xl,yl,zl);

       xl=x;
       yl=y;
       zl=z;
   }
  endShape();
}


void draw() 
{
  background(0,0,0);
  translate(200,200);
  scale(100,100,100);
  rotateX(radians(mouseX));
  rotateY(radians(mouseY));
  
  rotateZ(angle);
  angle+=PI/180.0f;
  DrawKnot1();
}