/*
* author: Kenneth Knudsen & Ricki Gregersen
* description: reads a line from a piece of paper using a webcam 
*              and outputs a tone between 440 and 880 Hz 
*              according to the lines y coordinate
*/
//use the minim sound library, included in processing 1.0
import ddf.minim.signals.*;
import ddf.minim.*;
import ddf.minim.analysis.*;
import ddf.minim.effects.*;

//CamModule instance for grapping a frame from the webcam
CamModule cam;
//SoundModule instance for outputting a sine wave at a specific frequence
SoundModule sound;
//TrackModule instance for translating a y coordinate to a frequency
TrackModule track;


void setup()
{
  size(640, 480);
  frameRate(30);
  //CamModule constructor takes an input of (PApplet, width to grap, height to grap and offset)
  //this means: we will grap 30x480 pixels from the webcam starting at 320 in the x direction
  cam = new CamModule(this, 30, height, 320);
  sound = new SoundModule(this);
  track = new TrackModule();
}

void draw()
{
  //get the bitmap from the webcam
  PImage frame = cam.bitmap();
  //process it and return the position of the line as a frequency
  float freq = track.processBitmap(frame);
  //feed the frequency to the soundModule
  sound.freq(freq);
  //present the frame grabbed from the webcam to the screen
  image(frame, 320, 0);
}
//remember to close the connection made to the soundcard
void stop()
{
  super.stop();
  sound.stop();
}