Draw a cylinder or cone in Processing

cylinder.pde

// Originally found at https://forum.processing.org/one/topic/draw-a-cone-cylinder-in-p3d.html

void cylinder(float bottom, float top, float h, int sides)
{
  pushMatrix();
  
  translate(0,h/2,0);
  
  float angle;
  float[] x = new float[sides+1];
  float[] z = new float[sides+1];
  
  float[] x2 = new float[sides+1];
  float[] z2 = new float[sides+1];
 
  //get the x and z position on a circle for all the sides
  for(int i=0; i < x.length; i++){
    angle = TWO_PI / (sides) * i;
    x[i] = sin(angle) * bottom;
    z[i] = cos(angle) * bottom;
  }
  
  for(int i=0; i < x.length; i++){
    angle = TWO_PI / (sides) * i;
    x2[i] = sin(angle) * top;
    z2[i] = cos(angle) * top;
  }
 
  //draw the bottom of the cylinder
  beginShape(TRIANGLE_FAN);
 
  vertex(0,   -h/2,    0);
 
  for(int i=0; i < x.length; i++){
    vertex(x[i], -h/2, z[i]);
  }
 
  endShape();
 
  //draw the center of the cylinder
  beginShape(QUAD_STRIP); 
 
  for(int i=0; i < x.length; i++){
    vertex(x[i], -h/2, z[i]);
    vertex(x2[i], h/2, z2[i]);
  }
 
  endShape();
 
  //draw the top of the cylinder
  beginShape(TRIANGLE_FAN); 
 
  vertex(0,   h/2,    0);
 
  for(int i=0; i < x.length; i++){
    vertex(x2[i], h/2, z2[i]);
  }
 
  endShape();
  
  popMatrix();
}