PImage b, c;
float x,y,w;
float r, theta; // variable for motion
int n;
int win_width;
int win_height;
int y_corner;

// variables for auto-constrast
int i_min, i_max;
static float discard = 0.0001;

PFont fontA;

static int DIV = 4;
static int JUMP_POINT = 40;
//static int REST = 20;

void setup() {
  size(screen.width/DIV, screen.height/DIV);//, 800);

  //b=loadImage("01_06_western landscape.jpg");
  //b=loadImage("/home/robert/Desktop/Photos/03_washington dc bedroom 2.jpg");
  b=loadImage("C:\\Swap\\Photos\\03_washington dc bedroom 2.jpg");
  //b=loadImage("C:\\Swap\\Photos\\01_06_western landscape.jpg");
  
  win_height=int(b.height*0.4/DIV);
  win_width=int(b.width*0.4/DIV);
  
  y_corner=0;//int((b.height-win_height)/2);
  
  x=0;
  y=0;
  
  n=0;
  r=0;
  theta=0;
  
  frameRate(24);

  // for frameRate display
  fontA = loadFont("CourierNew36.vlw");
  textFont(fontA, 32);

  // store initial auto-contrast params
  c = b.get(round(x), round(y+y_corner), win_width, win_height);
  calc_contrast(c);
    
}

void calc_contrast(PImage in) {
  // adjust contrast in place on input image
  in.loadPixels();
  // loop over pixels to find min and max Intensity
  int dimension = (in.width*in.height);
  int [] hist = new int[256];
  for(int i=0;i<dimension;i++) {
      color argb=in.pixels[i];

      int bin_a = argb & 0xFF000000;
      int r = (argb >> 16) & 0xFF;  // Faster way of getting red(rgb)
      int g = (argb >> 8) & 0xFF;   // Faster way of getting green(rgb)
      int b = argb & 0xFF;          // Faster way of getting blue(rgb)

      int intensity=int((r+g+b)/3);
      
      hist[intensity]++;
  };
  
  i_min=0;
  int threshold = int(dimension*discard);
  
  int sum=0;
  while(sum<threshold) {
    i_min++;
    sum+=hist[i_min];
  };
  
  i_max=256;
  sum=0;
  while(sum<threshold) {
    i_max--;
    sum+=hist[i_max];
  };
  
};

void adjust_contrast(PImage in) {
  // loop over pixels to scale RGB to min and max Intensity
  int dimension = (in.width*in.height);
  for(int i=0;i<dimension;i++) {
      color argb=in.pixels[i];
      
      int a = (argb >> 24) & 0xFF;
      //int bin_a = argb & 0xFF000000;
      int r = (argb >> 16) & 0xFF;  // Faster way of getting red(rgb)
      int g = (argb >> 8) & 0xFF;   // Faster way of getting green(rgb)
      int b = argb & 0xFF;          // Faster way of getting blue(rgb)

//      int ac_min=constrain(ac_center-(ac_width>>1), 0, 255);
//      int ac_max=constrain(ac_center+(ac_width>>1), 0, 255);
//      r=int(constrain(map(r, ac_min, ac_max, 0, 255), 0, 255));
//      g=int(constrain(map(g, ac_min, ac_max, 0, 255), 0, 255));
//      b=int(constrain(map(b, ac_min, ac_max, 0, 255), 0, 255));
      
      r=int(constrain(map(r, i_min, i_max, 0, 255), 0, 255));
      g=int(constrain(map(g, i_min, i_max, 0, 255), 0, 255));
      b=int(constrain(map(b, i_min, i_max, 0, 255), 0, 255));
      
      a = (a) << 24;
      r = r << 16;
      g = g << 8;
      b = b;
      color new_rgb = a | r | g | b;
      in.pixels[i]= new_rgb;
  };
  
  in.updatePixels();
};


void draw() {
  
  c = b.get(round(x), round(y+y_corner), win_width, win_height);
  
  calc_contrast(c);
  adjust_contrast(c);

  blend(c, 0, 0, win_width, win_height, 0, 0, width, height, BLEND);
  //blend(b, x, y+y_corner, (win_width), (win_height), 0, 0, width, height, BLEND);
  
  //filter(ERODE);
  //saveFrame("/Volumes/Swimming Pool/Processing/west-#####.tif");
  //saveFrame("C:\\Data\\01_06_western landscape/01_06_western landscape-#####.tif");
  //saveFrame("output\\03_washington dc bedroom 2-#####.tif");
  //println(x+":"+b.width+" "+y+":"+b.height);
  fill(255);
  text(frameRate, 15, 20);
 
  if(n>JUMP_POINT) {
    r=random(30, 80);
    theta=random(HALF_PI*0.75, HALF_PI*1.25);
    n=0;
  };
  
  // update motion
  x+=sin(theta)*r/((n+1));
  y+=cos(theta)*r/((n+1));
  
  n++;
  
  if(x+win_width>b.width) exit();
  if(y<win_height)y=win_height;
  //y=random(0,5);
  //w=random(-5,0);
}

//void mouseMoved() {
//  ac_center = int(255.0*float(mouseX)/float(width));
//  ac_width= int(255.0*float(mouseY)/float(height));
//}