/**
 * Receive scantron info from scanmark ES2010 in 5320 emulation mode
 * 
 * Serial settings:
 *   9600, 8, N, 2
 * 
 */


import processing.serial.*;

Serial myPort;  // Create object from Serial class
int val;      // Data received from the serial port

//byte[] inBuffer = new byte[53*8];
int numrows = 0;
int numread = 0;

void setup() 
{
  size(1100, 850);
  // 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, 'N', 8, 2.0);
  myPort = new Serial(this, portName, 9600);

  background(255);
}

void draw()
{

  while (myPort.available () > 0) {
    //inBuffer = myPort.readBytes();
    byte[] inBuffer = new byte[53*8];

    //numread = myPort.readBytes(inBuffer);
    numread = myPort.readBytesUntil(13, inBuffer);
    if (numread > 0) {
      String myString = new String(inBuffer);
      println(myString);
      //      println(inBuffer.length);
      //      println(numread);
      numrows=numread/8;
      println(str(numrows)+" rows on form");
      background(255);
      drawForm(inBuffer);
    }
  }

//  while (myPort.available() > 0) {
//    int lf = 10;
//    int cr = 13;
//    int numread;
//    //Expand array size to the number of bytes you expect:
//    numread = myPort.readBytesUntil(lf, inBuffer);
//    if (inBuffer != null) {
//      String myString = new String(inBuffer);
//      println(myString);
//    }
//  }   
}

void drawForm(byte[] inBuffer) {
  stroke(0);
  //fill(0);
  for (int i=0; i<numrows; i++)
    for (int j=0; j<8; j++) {
      byte curritem = inBuffer[j+(i*8)];
      println(binary(curritem));
      
      for (int b=0; b<6; b++) {
        int x,y;
        x=5+i*15;
        y=5+((j*6)+b)*15;
        //println((curritem>>b)==0);
        println(binary((curritem>>b)&0x01));
        if((((curritem>>b)&0x01))>0) { 
            fill(0);
        } else {
          noFill();
        }
        ellipse(x, (height-y-100), 10, 10);
      }
    }
    //delay(1000);
}