for arduino

arduino.pde

import processing.serial.*;

Serial myPort;

String input;

int r = 0;
int g = 0;
int b = 0;
int ax = 0;
int ay = 0;
int sType =0;

void setup(){
  size(800,800);
  myPort = new Serial(this, "/dev/tty.usbmodem1421", 9600);
  myPort.bufferUntil('\n');
}

void draw(){
  background(r,g,b);
  switch (sType) {
    case 1: 
      ellipse(ax, ay,100,100); 
      break;
    case 2:
      rect(ax,ay, 100,100);
      break;
    case 3:
    default :
      //println("something wrong");
      break;
  }
}

void serialEvent(Serial p){
  input = p.readString();
  trim(input);
  
  println(input);
  
  String[] sensorReadings = split(input, ",");
  int[] data = int(sensorReadings);
  
  //print(sensorReadings);
  //print(sensorReadings[0]);
  //print(sensorReadings[2]);
  //print(sensorReadings[3]);
  
  //println(sensorReadings[1]);
  if(data.length >2){
  r = data[0];
  g = data[1];
  b = data[2];
  ax = data[3];
  ay = data[4];
  sType = data[5];
  
  //println(data[5]);
  //println(int(sensorReadings[2]));
  }
}

sketch.ino

int rgbR = A0;
int rgbG = A1;
int rgbB = A2;
int axisX = A3;
int axisY = A4;
int sType = A5;

// for color
int mapR=0;
int mapG=0;
int mapB=0;
int r=0;
int g=0;
int b=0;

// for axis
int aX =0;
int aY =0;
int mapX =0;
int mapY =0;

// for shape
int shapeType =0;
int mapShape =0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  r = analogRead(rgbR);
  g = analogRead(rgbG);
  b = analogRead(rgbB);
  aX = analogRead(axisX);
  aY = analogRead(axisY);
  shapeType = analogRead(sType);
  
  mapR = map(r,0,1023,0,255);
  mapG = map(g,0,1023,0,255);
  mapB = map(b,0,1023,0,255);

  mapX = map(aX,0,1023,0,600);
  mapY = map(aY,0,1023,0,600);

  mapShape = map(shapeType,0,1023,0,3);
  
  //Serial.print("R :");
  //Serial.print(mapR);
  //Serial.print(" G :");
  //Serial.print(mapG);
  //Serial.print(" B :");
  //Serial.println(mapB);
  Serial.print(mapR);
  Serial.print(",");
  Serial.print(mapG);
  Serial.print(",");
  Serial.print(mapB);
  Serial.print(",");
  Serial.print(mapX);
  Serial.print(",");
  Serial.print(mapY);
  Serial.print(",");
  Serial.print(mapShape);
  Serial.println(",");
  delay(200);
}