// Example 19-8: Reading from serial port orig. by Daniel Shiffman
// modified by Yoshio Okamoto 22th Nov.2013, 17th Mar.2014

import processing.serial.*;

Serial port; // The serial port object

PrintWriter output;

int i = 0;
int t = 0;
int tt = 0;
int ttt = 0;     // line number
float x = 0;
float y = 0;
int base = -480; // wave signal base line shift
float px = 0;
float py = 0;
int data = 0;
int s = 0;
int m = 0;
int ps = 0;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
int tm = 0;
int tmax = 1000 * 60;   // display max data 10[sec] * 60 lines

String datastr; 
String datetimestr;
String format;

void setup() {
  size(1000,720);      // window size W,H
  strokeWeight( 1 );   // line width
  background( 0 );      // clear display
  port = new Serial(this, Serial.list()[1], 9600);  // set up port for the first serial port 
  frameRate(100);   // sampling rate/sec 100[Hz]  
  stroke(255);      // text color
// initialize  
  delay(1000);
  background(0);
  port.write('*');
}

void draw() {
 
// data file init.
    if (t == 0){     
    datetimestr = year()+"/"+nf(month(),2)+"/"+nf(day(),2)+"/Time="+nf(hour(),2) + "_" + nf(minute(),2) + "_" + nf(second(),2)+"_iFS";  // for Windows    
    output = createWriter(datetimestr+".dat");
    text( datetimestr,10,35);  
    port.write( '*' );
    }

// time mark   
    s = second();
    if (s == ps)
        tm = 0;
    else if (s % 10 == 0)
        tm = 8;
    else
        tm = 5;
    ps = s;   
     
// display 1 ch
      stroke (50, 250, 250);   // for 1ch with light blue color      
      x = tt;  
      y = data + base + ttt*10 - tm;
     
// display signal 
    if ((t==0) || (tt == 0))     
      point (x, y);
    else 
      line (px, py, x, y);
      
      px = x;
      py = y;
  
 // data to text file
     format = String.format("%04d", data);
     output.println(format); 
  
       tt = t % (width);
      ttt = int(t/width);  //line number
        t = t+1;
        
 // renewal drawing parameter     
   if (t>tmax){
    t = 0;
    tt = 0;

// save window image
    save( datetimestr+".png" );
    
    output.flush();  // write buffer to file
    output.close();  // close file

    background(0);   // reflesh window
   }
}

// for 1ch signal data input from Arduino 
void serialEvent( Serial p ) {
  if ( port.available() > 1 ) {
    data = port.read() + port.read() * 256 ;
    port.write( '*' );
  }
}