new_colors.pde

int max_rand_step = 5;
int frame_num = 0;
int shape_opacity = 20;
int num_of_rects = 40;

void setup(){
  size(displayWidth, displayHeight);
  frameRate(40);
}

color cur_background = color(int(random(255)), int(random(255)), int(random(255)));

int getRandIncrNumber(int num, int max_rand_step){
  return int(num + (random(max_rand_step) - (max_rand_step / 2)));
};

color getRandIncrColor(color base_color, int max_rand_step){
  return color(
    getRandIncrNumber(int(red(base_color)), max_rand_step),
    getRandIncrNumber(int(green(base_color)), max_rand_step),
    getRandIncrNumber(int(blue(base_color)), max_rand_step)
  ); 

};

void draw(){
  pushMatrix();
  translate(width/2, height/2);
  rectMode(CENTER);
  ellipseMode(CENTER);
  cur_background = getRandIncrColor(cur_background, max_rand_step);
  background(cur_background);
  stroke(random(255), random(255), random(255));
  int neg_red = 255-int(red(cur_background));
  int neg_green = 255-int(green(cur_background));
  int neg_blue = 255-int(blue(cur_background));
  fill(neg_red, neg_green, neg_blue, shape_opacity);
  for (int i=0; i<num_of_rects; i++){
    rect(0, 0, random(width), random(height));
  }
  println(frameRate);
  popMatrix();
}

void mouseDragged(){
  max_rand_step = int(map(mouseY, 0, height, 0, 255));
  shape_opacity = int(map(mouseX, 0, width, 0, 255));
};