// Example by Tom Igoe

import processing.serial.*;


// constants

int MINSIZE = 100;
int MAXSIZE = 640;
// global variables

int inByte;
float rectSize = MINSIZE;
Serial myPort;  // The serial port
int dataCount = 0;

void setup() {
  // List all the available serial ports
  println(Serial.list());
  // I know that the first port in the serial list on my mac
  // is always my  Keyspan adaptor, so I open Serial.list()[0].
  // Open whatever port is the one you're using.
  myPort = new Serial(this, Serial.list()[1], 57600);
  
  size(1280, 800);
  rectMode(CENTER);
}

void draw() {
  background(255);
  fill(0);
  rect(width/2, height/2, rectSize, rectSize);

//  rectSize --;
  rectSize = constrain(rectSize-(float)Reciprocal_Logarithmic_model(rectSize), MINSIZE, MAXSIZE);


  if (rectSize<MINSIZE) rectSize=MINSIZE;
}


void serialEvent(Serial myPort) {
  inByte = myPort.read();
    println(inByte);
    rectSize+=inByte;
    if(rectSize>height)rectSize=height;
    
    dataCount++;
    println("data count: " + dataCount);
    
//  if(inByte>intensity)intensity = inByte;
//  intensity=int((inByte-120)*3.5);
//  if (intensity < 0 ) intensity = 0;
//  if (intensity > 255) intensity = 255;

//  println(":" + intensity);
  
}

double Logarithmic_model(double x_in)
{
  //log model from zunzun.com
  //fit to data points
  //  100, 40
  //  2000, 1
   
  double temp;
  temp = 0.0;
  
  // coefficients
  double a = -2.8159001580415367E+02;
  double b = 5.8035502766356771E+01;

  temp = a + b*Math.log(x_in);
  return temp;
}


double Reciprocal_Logarithmic_model(double x_in)
{
  //reciprocal log model from zunzun.com
  //fit to data points
  //  100, 0
  //  640, 40

  double temp;
  temp = 0.0;

  // coefficients
  double a = 3.4188147348130071E+00;
  double b = -5.2523894603906762E-01;

  temp = 1.0 /(a + b*Math.log(x_in));
  return temp;
}