/**
 * Test 01: get data from serial port
 * and plot it in a graph
 * The graph has diffirent colors for odd and even count numbers
 *
 * from  http://robotpig.net/blogs/UAVs.php
 *
 * based on pre-installed sketch:
 * Examples -> Libraries -> Serial -> Simple Read
 * 
 */


import processing.serial.*;

Serial myPort;      // Create object from Serial class
int val;            // Data received from the serial port
int valx;           // normalize the value for the window dimensions
int xd = 1;         // x-axis 
int stxr;           // stroke colors R
int stxg;           // stroke colors G
int stxb;           // stroke colors B
int xdd;            // even-odd check
int xdc;            // even-odd check

void setup() 
{
  size(700, 256);
  // I know that the first port in the serial list on my mac
  // is always my  FTDI adaptor, so I open Serial.list()[0].
  // On Windows machines, this generally opens COM1.
  // Open whatever port is the one you're using.
  String portName = Serial.list()[0];
  myPort = new Serial(this, portName, 9600);
   background(255);
}

void draw()
{
while (myPort.available() >= 3) {
    if (myPort.read() == 0xff)
	val = (myPort.read() << 8) | (myPort.read());
        valx = val / 4 ;      //normalize the value for the window dimensions
} 


    //even-odd number check
    xdd = xd / 2 ;
    xdc =xd - xdd * 2 ;
    //swing bar color
    if (xdc == 0 ) {
    stxr = 204 ; stxg = 233 ; stxb = 248;
    } 
    else {stxr = 0 ; stxg = 146 ; stxb = 218;} ;
  
   println (xdc) ;       //this is just for testing, you can delete it
    
    // line:
    stroke(stxr, stxg, stxb);
    line(xd, height, xd, height - valx);

    // redraw
    if (xd >= width) {
      xd = 0;
      background(255); 
    } 
    else {
      // counter:
      xd++;
    }
  }