ControlP5でSliderを使う

import controlP5.*;

ControlP5 cp5;
PFont f;
int fSize = 12;

void setup() {
  size(300, 200);
  background(255);
  cp5 = new ControlP5(this);
  cp5.addSlider("fSize")
    .setPosition(10, 10)
    .setSize(100, 25)
    .setRange(10, 30);
  fill(#ff0000);
}

void draw(){
  background(255);
  f = createFont("Helvetica", 16, true);
  textFont(f, fSize);
  text("hello world", 100, 100);
}

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