How to adapted the text in function of height ? (with cp5)

Nattyx

Hi, I want to adapt my text in function of height with cp5.

import controlP5.*;

ControlP5 cp5;
Textarea myTextarea;

void setup() {
  size(400, 800);
  cp5 = new ControlP5(this);

  myTextarea = cp5.addTextarea("txt")
    .setPosition(0, 0)
    .setSize(200, 700)
    .setFont(createFont("arial", 800/40))
    .setLineHeight(14);

  myTextarea.setText("Step 1 : The victim must be lying on the back, head up. \n\n"
      +" "
      +"Step 2: Kneel down by the victim. Denude his/her chest. \n\n "
      +" "
      +"Step 3: Put your hands crossed on his/her chest. Take on your fingers for purpose of to you serves heel of your hands.. \n\n"
      +""
      +"Step 4: Start the massage by pressing your hands at the middle on the victime's chest, hand extended, elbows blocked. Get off your hands 4 to 5 centimetres then let them up for the blood back into the hearth. It's not recommended to practice mouse to mouse during massage cardiac. \n\n "
      +""
      +"Step 5: Following the massage until help arrived.\n\n""
    );
}

I thought with a friend to take this code :

  myTextarea = cp5.addTextarea("txt")
    .setPosition(0, 0)
    .setSize(200, 800)
    .setFont(createFont("arial", 12))
    .setLineHeight(14);

And to transform it like it :

myTextarea = cp5.addTextarea("txt")
    .setPosition(0, 0)
    .setSize(200,height/50)
    .setFont(createFont("arial", 12))
    .setLineHeight(14);

With a calculation for change the font height with the screen height, but we don't find the calculation.

If you find a other solution, say it !