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


import processing.video.*;

Capture video;
int threshold    = 225 ; 
int pixelSize    = 1 ;

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
  video = new Capture(this, width, height, 30);
  noStroke();
  smooth();
  
  fill(0, 0, 0, 255); 
  rect(0, 0, width, height) ;   
}

void draw() {
  
  if (video.available()) {
    video.read();
//     image(video, 0, 0, width, height); // Draw the webcam video onto the screen   
    video.loadPixels();
    
    int index = 0;
    for (int y = 0; y < video.height; y++) {
      for (int x = 0; x < video.width; x++) {
        
        // Get the color stored in the pixel
        color currColor = video.pixels[index];
        int pixelValue = video.pixels[index];
        float pixelBrightness = brightness(pixelValue);
        
        if( pixelBrightness > threshold ) {
          int currR = (currColor >> 16) & 0xFF; // Like red(), but faster
          int currG = (currColor >> 8) & 0xFF;
          int currB = currColor & 0xFF;     
          
          fill(currR, currG, currB, pixelBrightness); 
          ellipse(x - (pixelSize/2) , y - (pixelSize/2), pixelSize, pixelSize);           
        }
        index++;
      }
    }
  }
}