/* built with Studio Sketchpad: 
 *   https://sketchpad.cc
 * 
 * observe the evolution of this sketch: 
 *   https://hewitt.sketchpad.cc/sp/pad/view/ro.bAGluJpinWB/rev.3
 * 
 * authors: 
 *   Rebecca Meyer

 * license (unless otherwise specified): 
 *   creative commons attribution-share alike 3.0 license.
 *   https://creativecommons.org/licenses/by-sa/3.0/ 
 */ 



int numCircles = 500;
Circle[] circles = new Circle[numCircles]; // define the array
float distance;
PFont myFont;
void setup() 
{
  size(1000, 700);
  myFont = loadFont("Impact-30.vlw");
  textFont(myFont, 27);
  smooth();
  noStroke();
  for (int i=0; i<numCircles; i++) {
    circles[i] = new Circle(random(width), random(height)); // fill the array with circles at random positions
  }
}
void draw() {
  background(205);
  for (int i=0; i<numCircles; i++) {
    circles[i].display(); // display all the circles
  }
  fill(0, 0, 255);
  text("To change the color of the large circle, press r, g, b, y, t, or p and click and drag.", 30, 40);
}
class Circle {
  float x, y; // location
  float dim; // dimension
  color c; // color

  Circle(float x, float y) {
    this.x = x;
    this.y = y;
    dim = random(20, 50);
    c = color(random(255));
  }

  void display() {
    float distance = dist(x, y, mouseX, mouseY); // distance between circle and mouse
    if (distance < 255 && mousePressed)
    { // if distance is smaller than 255

      fill(255-distance, 0, 0);
      if (key == 'r')
      {
        fill(255-distance, 0, 0);
      }
      if (key == 'g')
      {
        fill(0, 255-distance, 0);
      }
      if (key == 'b')
      {
        fill(0, 0, 255-distance);
      }
      if (key == 't')
      {
        fill(0, 255-distance, 255-distance);
      }
      if (key == 'p')
      {
        fill(255-distance, 0, 255-distance);
      }
      if (key == 'y')
      {
        fill(255-distance, 255-distance, 0);
      }
    } 
    else if (distance < 255 && !mousePressed)
    { // if distance is bigger than 255
      fill(255-distance);
    }
    else
    {
      fill(c);
    }


    ellipse(x, y, dim, dim); // a circle at position xy
  }
}