void drawEm()  {
  String pdfname="";
  background(0); // clear previous crap
  
  if (! applet)  {
    noStroke();
    rectMode(CENTER);
    fill(255,255,0);
    rect(button_pdf.x, button_pdf.y, 8,8);
  }
  
  if (record == true)  { 
    pdfname = "pdf/stereotomic-" + millis() + ".pdf";
    beginRecord(PDF, pdfname); 
  }
  
  noFill();  
  // draw base lines
  plan_bline.drawLine();
  el_bline.drawLine();
  
  // fold line
  fold.drawLine();
  
  // construction lines
  // connect perspective points
  stroke(50);
  if (record)  { stroke(200); }
  line(p1.x, p1.z, p1.x, p1.y);
  line(p2.x, p2.z, p2.x, p2.y);
  line(p3.x, p3.z, p3.x, p3.y);
  line(p4.x, p4.z, p4.x, p4.y);
  // stereotomic perspective lines
  plan_p1b2.drawLine();
  plan_p1t2.drawLine();
  plan_p2b3.drawLine();
  plan_p2t3.drawLine();
  plan_p3b1.drawLine();
  plan_p3t1.drawLine();
  plan_p4b2.drawLine();
  plan_p4t2.drawLine();
  el_p1t2.drawLine();
  el_p2t3.drawLine();
  el_p3t1.drawLine();
  el_p4t2.drawLine();
  // connect points across fold
  stroke(50);
  if (record)  { stroke(200); }
  line(b1.x, el_bline.height, b1.x, b1.y);
  line(b2.x, el_bline.height, b2.x, b2.y);
  line(b3.x, el_bline.height, b3.x, b3.y);
  line(b4.x, el_bline.height, b4.x, b4.y);
  line(t1.x, t1.z, t1.x, t1.y);
  line(t2.x, t2.z, t2.x, t2.y);
  line(t3.x, t3.z, t3.x, t3.y);
  line(t4.x, t4.z, t4.x, t4.y);
  
  
  // solid lines
  stroke(255);
  if (record)  { stroke(0); }
  // base in plan
  beginShape();
  vertex(b1.x, b1.y);
  vertex(b2.x, b2.y);
  vertex(b3.x, b3.y);
  vertex(b4.x, b4.y);
  vertex(b1.x, b1.y);
  endShape();
  // base in elevation
  beginShape();
  vertex(b1.x, el_bline.height);
  vertex(b2.x, el_bline.height);
  vertex(b3.x, el_bline.height);
  vertex(b4.x, el_bline.height);
  vertex(b1.x, el_bline.height);
  endShape();
  
  // top in plan
  beginShape();
  vertex(t1.x, t1.y);
  vertex(t2.x, t2.y);
  vertex(t3.x, t3.y);
  vertex(t4.x, t4.y);
  vertex(t1.x, t1.y);
  endShape();
  //top in elevation
  beginShape();
  vertex(t1.x, t1.z);
  vertex(t2.x, t2.z);
  vertex(t3.x, t3.z);
  vertex(t4.x, t4.z);
  vertex(t1.x, t1.z);
  endShape();
  
  line(b1.x,el_bline.height, t1.x, t1.z);
  line(b1.x, b1.y, t1.x, t1.y);
  line(b2.x, b2.y, t2.x, t2.y);
  line(b2.x, el_bline.height, t2.x, t2.z);
  line(b3.x, b3.y, t3.x, t3.y);
  line(b3.x, el_bline.height, t3.x, t3.z);
  line(b4.x, el_bline.height, t4.x, t4.z);
  line(b4.x, b4.y, t4.x, t4.y);
  
  // unfolded
  stroke(150,200,0);
  beginShape();
  vertex(b2.x, b2.y);
  vertex(t2b.x, t2b.y);
  vertex(t3a.x, t3a.y);
  vertex(b3.x, b3.y);
  vertex(t3b.x, t3b.y);
  vertex(t4a.x, t4a.y);
  vertex(b4.x, b4.y);
  vertex(t4b.x, t4b.y);
  vertex(t1a.x, t1a.y);
  vertex(b1.x, b1.y);
  vertex(t1b.x, t1b.y);
  vertex(t2a.x, t2a.y);
  vertex(b2.x, b2.y);
  endShape();
  // lid
  beginShape();
  vertex(t1c.x, t1c.y);
  vertex(t2c.x, t2c.y);
  vertex(t3c.x, t3c.y);
  vertex(t4c.x, t4c.y);
  vertex(t1c.x, t1c.y);
  endShape();
  
  if (record == true)  {
    endRecord();
    link(pdfname, "_blank");
    record = false;
  }
  
  
  // draw control points
  noStroke();
  rectMode(CENTER);
  
  // corner points
  fill(0,255,0);
  b1.drawPoint();
  b2.drawPoint();
  b3.drawPoint();
  b4.drawPoint();
  fill(255,255,0);
  t1.drawPoint();
  t2.drawPoint();
  t3.drawPoint();
  t4.drawPoint();
  
  
  // vanishing points
  p1.drawPoint();
  p2.drawPoint();
  p3.drawPoint();
  p4.drawPoint();
  
  // draw text to ID last control point
  fill(255,100,0);
  textFont(font);
  String newtxt = last.txtID + "\n(" + 
          (int)last.x + "," + (int)(fold.height-last.y) + "," + (int)(el_bline.height - last.z) + ")";
  //text(newtxt, last.x+47, ((last.focus==PLAN)?last.y:last.z)+17, 90, 30);
  text(newtxt, 50, 20, 90, 30);
}