import processing.serial.*;

PrintWriter output;  // output file
Serial myPort;       // The serial port
int xPos = 1;        // hor position  graph

float previousValueX;
float previousValueY;  


void setup() 
{
    previousValueX = -1;
    previousValueY = -1;

    size(800, 800);                                 // set the window size:
    println(Serial.list());                         // List serial ports
  
    myPort = new Serial(this, Serial.list()[0], 9600); // COM8
    myPort.bufferUntil('\n');
  
    background(0);                                         // set inital background:
  
    println("Click on image and hit 's' to start");       // will start serial data
    println("Hit 'w' to write to file");                  // dump to file ad stop
  
    String file = String.valueOf(year());
  
    file = file + "." + String.valueOf(month());
    file = file + "." + String.valueOf(day());
    file = file + "." + String.valueOf(hour());
    file = file + "." + String.valueOf(minute());
    file = file + "." + String.valueOf(second()) + ".mat";
  
    println(file);  
  
    output = createWriter(file);    // Sketch->Show_Sketch_fie
}  // setup 


void draw() 
{ 
  if(keyPressed) 
  { 
    if(key == 's' || key == 'S') 
    { 
      myPort.write("H");
    } // if (key == 's' || key == 'S')
    if(key == 'w' || key == 'W') 
    { 
      output.flush();     // Writes the remaining data to the file
      output.close();     // Finishes the file
      exit();             // Stops the program
    } // if (key == 'w' || key == 'W')
  } // if( keyPressed)
} // draw () 


/**
 * For processing 2.0 release, It's here because:
 * http://forum.processing.org/two/discussion/838/function-readstringuntilint-does-not-exist
 */
public String readStringUntil(Serial myPort, int inByte) 
{
  byte temp[] = myPort.readBytesUntil(inByte);
  if (temp == null) 
  {
     return null;
  } 
  else 
  {
     return new String(temp);
  }
}


void serialEvent(Serial myPort) 
{ 
  String inString = myPort.readStringUntil('\n');               // get the ASCII string
  if(inString != null) 
  { 
    inString = trim(inString);                                   // trim whitespace
    println(inString);
    
    if(inString.equals("@")) // Control character '@' means 'Start curve'
    {
        previousValueX = -1;
        previousValueY = -1;
    }
    else if(inString.startsWith("#")) // Control character '#' means 'End curve'
    {
        textSize(10);
        text(inString.substring(1), previousValueX + 2, height - previousValueY); // Print Ub voltage right on curve
    }
    else if(inString.equals("$")) // Control character '$' means 'Tracing finished'
    {
        output.flush();     // Writes the remaining data to the file
        output.close();     // Finishes the file
        //exit();             // Stops the program
    }
    else if(inString.equals("!")) // Control character '$' means 'Tracing finished'
    {
        ;
    }
    else
    {
      int[] vv = int(split(inString, ' '));
      
      output.println(inString );
      float valueY = float(vv[0]);                              // collector current   
      float valueX = float(vv[1]);                              // Uce voltage
      valueY = map(valueY, 0, 1023, 0, height * .95); 
      valueX = map(valueX, 0, 1023, 0, height * .95);
      
      if(previousValueX == -1)
      {
        previousValueX = valueX;
        previousValueY = valueY;
      }
      else
      {
        stroke(127, 34, 255);                                      // color to draw
        line(previousValueX, height - previousValueY, valueX, height - valueY);    // draw the line
        previousValueX = valueX;
        previousValueY = valueY;
      }
      
      /*if(xPos >= 6 * width) 
      { 
        xPos = 0;                                                // auto redraw
        background(0);                                             
      } // if (xPos >= 2*width)
      else                 
      { 
        xPos = xPos + 1;
      }*/ // else
    } // if(inString.startsWith('#')     
  } // if (inString != null) 
} // serialEvent (Serial myPort)