/*  
 Serial String Reader
 Language: Processing
 
 Reads in a string of characters from a serial port until 
 it gets a linefeed (ASCII 10).  Then splits the string into 
 sections separated by commas. Then converts the sections to ints, 
 and prints them out.
 */

import processing.serial.*;     // import the Processing serial library

int linefeed = 10;		  // Linefeed in ASCII
Serial myPort;			// The serial port
int sensor = 0;
int startPos = 100;
int graphPos = startPos;
int lastPos = height-10;
int vals[];
boolean firstTime = true;
int dMode = 1;
int lastReading = 2;

PFont myFont;
PFont myFont2;
int fontSize = 20;
int fontSize2 = 50;

void setup() {
  size(1000, 400);

  // 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  Arduino module, so I open Serial.list()[0].
  // Change the 0 to the appropriate number of the serial port
  // that your microcontroller is attached to.
  myPort = new Serial(this, Serial.list()[0], 9600);

  // read bytes into a buffer until you get a linefeed (ASCII 10):
  myPort.bufferUntil(linefeed);

  vals = new int[width + 20];

  PFont myFont = createFont(PFont.list()[2], fontSize);
  textFont(myFont);

  background(0);
  stroke(255,255,255);
  line(startPos-5, height, startPos-5, 49);  

  line(startPos-5, 49, startPos-10, 49);
  text("5v", startPos-12-fontSize, 49+fontSize/2); 

  line(startPos-5, height-(816/3+10), startPos-10, height-(816/3+10));
  text("4v", startPos-12-fontSize, (height-(816/3+10))-(fontSize/4)); 

  line(startPos-5, height-(612/3+10), startPos-10, height-(612/3+10));
  text("3v", startPos-12-fontSize, (height-(612/3+10))-(fontSize/4));	

  line(startPos-5, height-(408/3+10), startPos-10, height-(408/3+10));
  text("2v", startPos-12-fontSize, (height-(408/3+10))-(fontSize/4));    

  line(startPos-5, height-(204/3+10), startPos-10, height-(204/3+10));
  text("1v", startPos-12-fontSize, (height-(204/3+10))-(fontSize/4));  

  line(startPos-5, 390, startPos-10, 390);
  text("0v", startPos-12-fontSize, 390-fontSize/4);  
}

void draw() {
  // twiddle your thumbs
}

// serialEvent  method is run automatically by the Processing applet
// whenever the buffer reaches the  byte value set in the bufferUntil() 
// method in the setup():

void serialEvent(Serial myPort) { 
  // read the serial buffer:
  String myString = myPort.readStringUntil(linefeed);

  // if you got any bytes other than the linefeed:
  if (myString != null) {

    myString = trim(myString);

    sensor = int(myString);
    print(sensor*0.0048828125);
  }
  // add a linefeed after all the sensor values are printed:
  println();
  if(dMode == 1){
    drawVom();
  }else if(dMode == 2){
    drawGraph();
  }
}

void drawGraph(){
  int lineHeight = sensor/3 + 10;

  //println(height-lineHeight);
  if(firstTime){
    firstTime = false;
    vals[graphPos] = lineHeight;
  }
  else if(graphPos == startPos){
    stroke(255,255,255);
    line(startPos-5, height, startPos-5, 49);

    line(startPos-5, 49, startPos-10, 49);
    text("5v", startPos-12-fontSize, 49+fontSize/2); 

    line(startPos-5, height-(816/3+10), startPos-10, height-(816/3+10));
    text("4v", startPos-12-fontSize, (height-(816/3+10))-(fontSize/4)); 

    line(startPos-5, height-(612/3+10), startPos-10, height-(612/3+10));
    text("3v", startPos-12-fontSize, (height-(612/3+10))-(fontSize/4));	

    line(startPos-5, height-(408/3+10), startPos-10, height-(408/3+10));
    text("2v", startPos-12-fontSize, (height-(408/3+10))-(fontSize/4));    

    line(startPos-5, height-(204/3+10), startPos-10, height-(204/3+10));
    text("1v", startPos-12-fontSize, (height-(204/3+10))-(fontSize/4));  

    line(startPos-5, 390, startPos-10, 390);
    text("0v", startPos-12-fontSize, 390-fontSize/4); 
    vals[graphPos] = lastPos;
    graphPos++;
  }
  vals[graphPos] = height-lineHeight;

  stroke(255, 0, 0);

  line(graphPos, vals[graphPos-1], graphPos, height-lineHeight);

  if(graphPos >= width){
    graphPos = startPos;
    lastPos = height-lineHeight;
    background(0);
  }
  else{
    graphPos++;
  }
} 

void drawVom(){
  if(lastReading != sensor){
    background(0);
    stroke(255,255,255);
    PFont myFont2 = createFont(PFont.list()[2], fontSize2);
    textFont(myFont2);
    text(str(sensor*0.0048828125), width/2-fontSize2/2, height/2-fontSize2/2);
    textFont(myFont);
  }
}
 

error, disabling serialEvent() for /dev/ttyUSB0
java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at processing.serial.Serial.serialEvent(Serial.java:235)
	at gnu.io.RXTXPort.sendEvent(RXTXPort.java:732)
	at gnu.io.RXTXPort.eventLoop(Native Method)
	at gnu.io.RXTXPort$MonitorThread.run(RXTXPort.java:1575)
Caused by: java.lang.RuntimeException: A null PFont was passed to textFont()
	at processing.core.PGraphics.textFont(PGraphics.java:2476)
	at processing.core.PApplet.textFont(PApplet.java:7346)
	at processing_serial_input_graph_pde.drawVom(processing_serial_input_graph_pde.java:174)
	at processing_serial_input_graph_pde.serialEvent(processing_serial_input_graph_pde.java:113)
	... 8 more