/**
 * Brightness Tracking 
 * by Golan Levin. 
 * 
 * Tracks the brightest pixel in a live video signal. 
 */


import processing.video.*;

Capture video;

int upper, lower, left, right;

void setup() {
  size(640, 480); // Change size to 320 x 240 if too slow at 640 x 480
  // Uses the default video input, see the reference if this causes an error
  
  println(Capture.list());
//  video = new Capture(this, width, height, "Sony HD Eye for PS3 (SLEH 00201)", 30);
video = new Capture(this, width, height, 30);
  noStroke();
  smooth();
  
  upper=left=0;
  lower=height;
  right=width;
}

void draw() {
  if (video.available()) {
    video.read();
    image(video, 0, 0, width, height); // Draw the webcam video onto the screen
    int reddestX = 0; // X-coordinate of the brightest video pixel
    int reddestY = 0; // Y-coordinate of the brightest video pixel
    float brightestValue = 0; // Brightness of the brightest video pixel
    // Search for the brightest pixel: For each row of pixels in the video image and
    // for each pixel in the yth row, compute each pixel's index in the video
    video.loadPixels();
    int index = 0;
    for (int y = upper; y < lower; y++) {
      for (int x = left; x < right; x++) {
        index = x + y * video.width;
        // Get the color stored in the pixel
        int pixelValue = video.pixels[index];
        // Determine the brightness of the pixel
        float pixelBrightness = red(pixelValue);
        // If that value is brighter than any previous, then store the
        // brightness of that pixel, as well as its (x,y) location
        if (pixelBrightness > brightestValue) {
          brightestValue = pixelBrightness;
          reddestY = y;
          reddestX = x;
        }
//        index++;
      }
    }
    // Draw a large, yellow circle at the brightest pixel
    fill(255, 0, 0, 128);
    if(brightestValue > 192)
    ellipse(reddestX, reddestY, 20, 20);
  }
  stroke(128, 0, 0);
  noFill();
  rect(left, upper, right-left, lower-upper);
  noStroke();
}

void mousePressed() {
  upper=mouseY;
  left=mouseX;
}

void mouseDragged() {
  lower=mouseY;
  right=mouseX;
}

void mouseReleased() {
  lower=mouseY;
  right=mouseX;
  if(upper>lower) {
    int temp=upper;
    upper=lower;
    lower=temp;
  }
  if(right<left) {
    int temp=right;
    right=left;
    left=temp;
  }
  println(upper);
  println(left);
  println(lower);
  println(right);
}