import processing.video.*;
Capture video;
PImage prevFrame;



void setup() {
  size(640, 480);
  video = new Capture(this, width, height, 30);
  video.start();
  prevFrame = createImage(video.width, video.height, RGB);

  String[] cameras = Capture.list();
  if (cameras.length == 0) {
    println("There are no cameras available for capture.");
    exit();
  } else {
    println("Available cameras:");
  }
  for (int i = 0; i < cameras.length; i++) {
    println(cameras[i]);
  }


}

void captureEvent(Capture video) {
  // Save previous frame for motion detection!!
  prevFrame.copy(video, 0, 0, video.width, video.height, 0, 0, video.width, video.height); // Before we read the new frame, we always save the previous frame for comparison!
  prevFrame.updatePixels();  // Read image from the camera
  video.read();
}

void draw() {

  loadPixels();
  video.loadPixels();
  prevFrame.loadPixels();

  // Begin loop to walk through every pixel
  for (int x = 0; x < video.width; x ++ ) {
    for (int y = 0; y < video.height; y ++ ) {
      int loc = x+y*width;
      float r = red(video.pixels[loc]);
      float g = green(video.pixels[loc]);
      float b = blue(video.pixels[loc]);
      pixels[loc] = color(r, g, b) / 2;

      color current = video.pixels[loc];      // Step 2, what is the current color
      color previous = prevFrame.pixels[loc]; // Step 3, what is the previous color

      // Step 4, compare colors (previous vs. current)
      float r1 = red(current);
      float g1 = green(current);
      float b1 = blue(current);
      float r2 = red(previous);
      float g2 = green(previous);
      float b2 = blue(previous);
      float diff = dist(r1, g1, b1, r2, g2, b2);

      // Step 5, How different are the colors?
      // If the color at that pixel has changed, then there is motion at that pixel.

      int s = second();


      if ((diff > 20) && (diff < 29)) {
        pixels[loc] = color(r, g, b) / 2;
      } else if (diff < 5) {
        pixels[loc] = color(s*2, s*2.1, s*2.4);
        }
       else if ((diff > 30) && (diff < 39)) {
        pixels[loc] = color(r, g, b) / 3;
      } else if ((diff > 40) && (diff < 49)) {
        pixels[loc] = color(r, g, b) / 5;
      } else {
        pixels[loc] = color(r*diff, g*diff, b*diff);
      }
  }
  }

  updatePixels();
}