//Christina Papandrea  CSCI 273 Assignment 6  10/27/09

float radius = 1.0; 
int h = 0, dimension;
float s = 1;
PImage img;

void setup() {
  size(600,600);
  background(0);
  colorMode(HSB,360,100,100);

  noStroke();
  smooth();
  img = loadImage("photo.jpg"); //load space background
  dimension = img.height * img.width;
  image(img,0,0); 
  frameRate(10000);
}



void draw() { //keeps motor running



}

void keyPressed() {
  if (key == 'h') {
    img.loadPixels();
    //increments hue 60 degrees 
    // % makes sure hue never grows beyond 360
    for (int i=0; i < dimension; i++) { 
      img.pixels[i] = color((hue(img.pixels[i])+60)%360, saturation(img.pixels[i]), brightness(img.pixels[i])); 
    }
    img.updatePixels();
    image(img, 0, 0);
  }
  if (key == 't') {
    img.loadPixels();
    //increments saturation of tint by 20
    // % makes sure saturation never grows beyond 100
    for(int t=0; t < dimension; t++) {
      tint(300,(random(t)+20)%100,100);
    }
    img.updatePixels();
    image(img, 0, 0);  
  }
}

void mousePressed() {
  //loads the pixels from the display
  img.loadPixels();
}
void mouseDragged(){
  int h, s, b, j, i, currentIndex = mouseX-1 + (mouseY-1)*img.width;
  color currentPixelColor;
  img.loadPixels();
  //sums the nine pixels h,s,b centered at the mouse
  for (h=0, s=0,b=0,j = 0; j<3; j++) {
    for (i = 0; i<3; i++) {
      h += hue(img.pixels[currentIndex+i]);
      s += saturation(img.pixels[currentIndex+i]);
      b += brightness(img.pixels[currentIndex+i]);
    }
    currentIndex += img.width;

  }
  //sets fill to the mean of the 9 pixels 
  fill(color(h/9, s/9,constrain(b/9+20,0,100), 50));
  //draws a circle wth the averaged fill at the location 
  ellipse(mouseX, mouseY, 40,40);
  stroke(2);
  line((mouseX+5), (mouseY+5), (mouseX-5), (mouseY-5));


}
void mouseReleased() {
  // refreshes the pixels and redraws the image to the display
  img.updatePixels();
  image(img, 0, 0);
}