midi.pde

import themidibus.*;

MidiBus myBus;
int y = 0;
int vel = 0;

void setup() {
  size(1024, 768);
  background(0);
  myBus = new MidiBus(this, 0, -1);
}

void draw() {
  background(0);
  float ny = pow(norm(y, 36, 98), 2) * height;
  stroke(255, 255, 255, vel);
  strokeWeight(norm(vel, 0, 127) * 40);
  line(0, height - ny, width, height - ny); 
}

void noteOn(int channel, int pitch, int velocity) {
  y = pitch;
}

void controllerChange(int channel, int number, int value) {
  if (channel == 0 && number == 2) {
    vel = value * 2;
    return;
  }
}