import processing.video.*; //imports the processing video library

int lineloc = 1;
int[][] colors; // an array to store the color value of each pixel captured from the webcam
int signal = 0; // the location of the scanner represented by a white line that moves up and odwn the screen when a key is pressed
int dir = 1; // the direction that signal is traveling

Capture video; // declaring the video variable

void setup() {
  size(960,600);
  frameRate(60);
  colors = new int[height][width]; // initialization of colors array
  video = new Capture(this,width,height,60); // initializing the video variable 
}

void draw(){
  background(0);

  // starting video capture
  if (video.available()) {
    video.read();
  }

  loadPixels(); //loading the pixels from the captured video into the default array video.pixels

    // the colors array is initialized here, with each array location getting a color value that 
  // corresponds with each pixel in the captured video
  int t = 0;
  for(int i = 0; i < height;i++){
    for(int x = 0; x <width; x++){

      colors[i][x] = video.pixels[t];
      t++;
    }
  }


  if(mousePressed){
    signal = abs(mouseY%height);
  }
  else{
    signal += 0.3*dir;
  }
  
  signal += dir; // updating signal

  //checking to see if the signal line is at the top or bottom of the picture and reversing direction
  if(signal > height || signal < 0){
    dir *= -1;
  }
  
  //here is where the generative art is drawn
  if(!keyPressed){
      for(int x = 0; x <= width; x ++){
        stroke(colors[signal][x]);
        line(lineloc+x,0,lineloc+x,height);
    }
  }
  else{ // if any key is pressed it shows the webcam image and the current placement of the signal line
    loadPixels();
    image(video,0,0);
    stroke(255);
    line(0,signal,width,signal);
  }

}