// VirtualColorMixer
//  This example code is in the public domain.
 import processing.serial.*;
 float redValue = 0;        // red value
 float greenValue = 0;      // green value
 float blueValue = 0;       // blue value
 Serial myPort;

 void setup()
 {
   size(200, 200);
   // List all the available serial ports
   // if using Processing 2.1 or later, use Serial.printArray()
   println(Serial.list());
 
   // I know that the first port in the serial list on my mac
   // is always my  Arduino, so I open Serial.list()[0].
   // Open whatever port is the one you're using.
   myPort = new Serial(this, Serial.list()[4], 9600);
   // don't generate a serialEvent() unless you get a newline character:
   myPort.bufferUntil('\n');
 }

 void draw()
 {
   // set the background color with the color values:
   background(redValue, greenValue, blueValue);
 }

 void serialEvent(Serial myPort) 
 {
   // get the ASCII string:
   String inString = myPort.readStringUntil('\n');

   if (inString != null) 
   {
     // trim off any whitespace:
     inString = trim(inString);
     // split the string on the commas and convert the
     // resulting substrings into an integer array:
     float[] colors = float(split(inString, ","));
     // if the array has at least three elements, you know
     // you got the whole thing.  Put the numbers in the
     // color variables:
     if (colors.length >=3) 
     {
       // map them to the range 0-255:
       redValue = map(colors[0], 0, 1023, 0, 255);
       greenValue = map(colors[1], 0, 1023, 0, 255);
       blueValue = map(colors[2], 0, 1023, 0, 255);
     }
   }
 }