Nicer plotter for differential visualization

plotter.pde

import processing.serial.*;

Serial myPort;        // The serial port
int xPos = 1;         // horizontal position of the graph
float inByte = 0;
float prev=0;
float prev2=0;
float norm=0;


void setup () {
  // set the window size:
  size(400, 900);

  // List all the available serial ports
  // if using Processing 2.1 or later, use Serial.printArray()
  //println(Serial.list());
  int port=0;
  String[] ser=Serial.list();
  for(int i=0; i<ser.length; i++){
    if(ser[i].contains("usbmodem")){
      port=i;
    }
  }
  
  // I know that the first port in the serial list on my mac
  // is always my  Arduino, so I open Serial.list()[0].
  // Open whatever port is the one you're using.
  myPort = new Serial(this, Serial.list()[port], 9600);

  // don't generate a serialEvent() unless you get a newline character:
  myPort.bufferUntil('\n');

  // set inital background:
  background(0);
}
void draw () {
  // draw the line:
  stroke(127, 34, 255);
  if(inByte>10){
    line(xPos, height/2-inByte, xPos,   height/2+inByte);
    //norm=pow((inByte-prev),15);
    
    println(inByte);
    //line(xPos, 50+norm, xPos,   50-norm);
    prev2=prev;
    prev=inByte;
    // at the edge of the screen, go back to the beginning:
    if (xPos >= width) {
      xPos = 0;
      background(0);
    } else {
      // increment the horizontal position:
      xPos+=2;
    }
  }
}


void serialEvent (Serial myPort) {
  // get the ASCII string:
  String inString = myPort.readStringUntil('\n');

  if (inString != null) {
    // trim off any whitespace:
    inString = trim(inString);
    // convert to an int and map to the screen height:
    inByte = 0+ int(inString)*(pow((int(inString)-prev),2)/int(inString));
    prev=int(inString);
    //inByte=inByte-(inByte-100);
    //println(inByte);
    //println(inByte);
    inByte = map(inByte, 0, 256, 0, height);
  }
}