Arduino+Processing Oscilloscope

oscilloscope.h

/*
 * oscilloscope.h
 *
 * Gives a visual rendering of a value (typically analog pin 0) in realtime.
 *
 * This is an object-oriented version of the Poorman's oscilloscope as explained here:
 * http://accrochages.drone.ws/node/90
 *
 * (c) 2008 Sofian Audry | info(@)sofianaudry(.)com
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */





/* An example of Arduino code. */
/*
#include "oscilloscope.h"

#define ANALOG_IN 0

void setup() {
  Serial.begin(9600);
}

void loop() {
  int val = analogRead(ANALOG_IN);
  OSC(0,val);
}

*/



#ifndef OSCILLOSCOPE_INC
#define OSCILLOSCOPE_INC

#include "WProgram.h"

void writeOscilloscope(int channel, int value) {
  Serial.print( 0xff, BYTE );                // send init byte
  Serial.print( channel & 0xff, BYTE);       // Send channel ID;
  Serial.print( (value >> 8) & 0xff, BYTE ); // send first part
  Serial.print( value & 0xff, BYTE );        // send second part
}
void writeOscilloscope(int value){
  writeOscilloscope(0,value);
}
#define OSC(c,v) (writeOscilloscope(c,v))
#endif

oscilloscope.pde

/*
 * Oscilloscope
 * Gives a visual rendering of analog pin 0 in realtime.
 * 
 * This project is part of Accrochages
 * See http://accrochages.drone.ws
 * 
 * (c) 2008 Sofian Audry (info@sofianaudry.com)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */ 
import processing.serial.*;

Serial port;  // Create object from Serial class
int val[];      // Data received from the serial port
int channels = 5;
int[][] values;
int[] palette = new int[]{#ffffff,#ff0000,#00ff00,#0000ff,#888800,#888888};
void setup() 
{
  size(640, 480);
  // Open the port that the board is connected to and use the same speed (9600 bps)
  String[] ttys = Serial.list();
  println("BORKLET: " + ttys.length);
  port = new Serial(this, ttys[0], 9600);
  values = new int[channels][width];
  val=new int[channels];
  smooth();
}

int getY(int val) {
  return (int)(val / 1023.0f * height) - 1;
}
void draw()
{
  
  while (port.available() >= 4) {
    if (port.read() == 0xff) {
      int channel =port.read();
      val[channel] = (port.read() << 8) | (port.read());
    }
  }
  background(0);
    
  for (int c=0; c< channels; c++){
    int delta = values[c][width-1] - val[c];
    for (int i=0; i<width-1; i++)
      values[c][i] = values[c][i+1];
    values[c][width-1] = val[c];
    
    stroke(palette[c]);
    
    text("C"+c+": "+val[c], 15,20+30*c,150,70);
    text("D: "+ delta, 150,20+30*c,150,70);
    for (int x=1; x<width; x++) {
      line(width-x,   height-1-getY(values[c][x-1]), 
           width-1-x, height-1-getY(values[c][x]));
    }
  }
}

Is it possible to modify this to read a PWM signal from digital pin 5?

WTF is going on here... I imported the code and tried to run it.
processing.app.SketchException: Not expecting symbol 'i', which is LATIN SMALL LETTER I.

Guys It's code for what
?