// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 7-5: Zoog with functions
  
  float x = 100;
  float y = 100;
  float w = 60;
  float h = 60;
  float eyeSize = 16;
  
  void setup() {
    size(200,200);
    smooth();
  }
  
  void draw() {
    background(255); // Draw a black background
    
    // mouseX position determines speed factor for moveZoog function
    float factor = constrain(mouseX/10,0,5);
  
    // The code for changing the variables associated with Zoog and displaying Zoog is moved outside of draw() and into functions called here. 
    // The functions are given arguments, such as “Jiggle Zoog by the following factor” and “draw Zoog with the following eye color.
    jiggleZoog(factor);
    // pass in a color to drawZoog
    // function for eye's color
    float d = dist(x,y,mouseX,mouseY);
    color c = color(d);
    drawZoog(c);
  }
  
  void jiggleZoog(float speed) {
    // Change the x and y location of Zoog randomly
    x = x + random( - 1,1)*speed;
    y = y + random( - 1,1)*speed;
    // Constrain Zoog to window
    x = constrain(x,0,width);
    y = constrain(y,0,height);
  }
  
  void drawZoog(color eyeColor) {
    // Set ellipses and rects to CENTER mode
    ellipseMode(CENTER);
    rectMode(CENTER);
    // Draw Zoog's arms with a for loop
    for (float i = y - h/3; i < y + h/2; i += 10) {
      stroke(0);
      line(x - w/4,i,x + w/4,i);
    }
    // Draw Zoog's body
    stroke(0);
    fill(175);
    rect(x,y,w/6,h);
    // Draw Zoog's head
    stroke(0);
    fill(255);
    ellipse(x,y - h,w,h);
    // Draw Zoog's eyes
    fill(eyeColor);
    ellipse(x - w/3,y - h,eyeSize,eyeSize*2);
    ellipse(x + w/3,y - h,eyeSize,eyeSize*2);
    // Draw Zoog's legs
    stroke(0);
    line(x - w/12,y + h/2,x - w/4,y + h/2 + 10);
    line(x + w/12,y + h/2,x + w/4,y + h/2 + 10);
  }