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import processing.serial.*;
Serial port;
 
void setup() {
  background(0);
  size(500, 500);
  frameRate(5);
  
  println(Serial.list());
  port = new Serial(this, "/dev/tty.usbmodem1411", 9600);
  
  sendDMX(1, 0);
  sendDMX(2, 0);
  sendDMX(1, 255);
}
 
void draw(){
  while(port.available() > 0) {
    print(port.readString());
  }
  
  int red = int(map(mouseX, 0, width, 0, 255));
  int green = int(map(mouseY, 0, height, 0, 255));
  
  background(red, green, 0);
  stroke(255);
  text("Red: " + red + " - Green: " + green, 20, 20);
  
  sendDMX(1, red);
  sendDMX(2, green);
  sendDMX(3, 0);
}

void sendDMX(int channel, int value) {
  print(str(channel));
  print(":");
  print(str(value));
  print('\n');
  
  port.write(str(channel));
  port.write(":");
  port.write(str(value));
  port.write('\n');
}