void setup(){
    size(200, 200);
    background(190);
    smooth();
    // Ground plane
    int groundHeight = 10;
    fill(0);
    rect(0, height-groundHeight, width, groundHeight);
    fill(255);
    
    // Center the houses
    translate(12, 0);
  
    // Houses
    Door door1 = new Door(20, 40);
    Window window1 = new Window(50, 62, false, Window.DOUBLE);
    Roof roof1 = new Roof(Roof.DOME);
    House house1 = new House(75, 75, door1, window1, roof1, House.MIDDLE_DOOR);
    house1.drawHouse(0, height-groundHeight-house1.h, true);
  
    Door door2 = new Door(20, 40);
    Window window2 = new Window(50, 62, true, Window.QUAD);
    Roof roof2 = new Roof(Roof.GAMBREL);
    House house2 = new House(100, 60, door2, window2, roof2, House.LEFT_DOOR);
    house2.drawHouse(house1.x + house1.w, height-groundHeight-house2.h, true);
  }
  
  class Door{
    //door properties
    int x;
    int y;
    int w;
    int h;
  
    // for knob
    int knobLoc = 1;
    //constants
    final static int RT = 0;
    final static int LFT = 1;
  
    // constructor
    Door(int w, int h){
      this.w = w;
      this.h = h;
    }
  
    // draw the door
    void drawDoor(int x, int y) {
      rect(x, y, w, h);
      int knobsize = w/10;
      if (knobLoc == 0){
        //right side
        ellipse(x+w-knobsize, y+h/2, knobsize, knobsize);
      }
      else {
        //left side
        ellipse(x+knobsize, y+h/2, knobsize, knobsize);
      }
    }
  
    // set knob position
    void setKnob(int knobLoc){
      this. knobLoc = knobLoc;
    }
  }
  
  class Window{
    //window properties
    int x;
    int y;
    int w;
    int h;
  
    // customized features
    boolean hasSash = false;
  
    // single, double, quad pane
    int style = 0;
    //constants
    final static int SINGLE = 0;
    final static int DOUBLE = 1;
    final static int QUAD = 2;
  
    // constructor 1
    Window(int w, int h){
      this.w = w;
      this.h = h;
    }
    // constructor 2
    Window(int w, int h, int style){
      this.w = w;
      this.h = h;
      this.style = style;
    }
    // constructor 3
    Window(int w, int h, boolean hasSash, int style){
      this.w = w;
      this.h = h;
      this.hasSash = hasSash;
      this.style = style;
    }
  
    // draw the window
    void drawWindow(int x, int y) {
      //local variables
      int margin = 0;
      int winHt = 0;
      int winWdth = 0;
  
      if (hasSash){
        margin = w/15;
      }
  
      switch(style){
      case 0:
        //outer window (sash)
        rect(x, y, w, h);
        //inner window
        rect(x+margin, y+margin, w-margin*2, h-margin*2);
        break;
      case 1:
        winHt = (h-margin*3)/2;
        //outer window (sash)
        rect(x, y, w, h);
        //inner window (top)
        rect(x+margin, y+margin, w-margin*2, winHt);
        //inner windows (bottom)
        rect(x+margin, y+winHt+margin*2, w-margin*2, winHt);
        break;
      case 2:
        winWdth = (w-margin*3)/2;
        winHt = (h-margin*3)/2;
        //outer window (sash)
        rect(x, y, w, h);
        //inner window (top-left)
        rect(x+margin, y+margin, winWdth, winHt);
        //inner window (top-right)
        rect(x+winWdth+margin*2,  y+margin, winWdth, winHt);
        //inner windows (bottom-left)
        rect(x+margin, y+winHt+margin*2, winWdth, winHt);
        //inner windows (bottom-right)
        rect(x+winWdth+margin*2,  y+winHt+margin*2, winWdth, winHt);
        break;
      }
    }
  
    // set window style (number of panes)
    void setStyle(int style){
      this.style = style;
    }
  }
  
  class Roof{
    //roof properties
    int x;
    int y;
    int w;
    int h;
  
    // roof style
    int style = 0;
    //constants  
    final static int CATHEDRAL = 0;
    final static int GAMBREL = 1;
    final static int DOME = 2;
  
    // default constructor
    Roof(){
    }
     
     // constructor 2
     Roof(int style){
      this.style = style;
    }
  
    // draw the roof
    void drawRoof(int x, int y, int w, int h) {
      switch(style){
      case 0:
        beginShape();
        vertex(x, y);
        vertex(x+w/2, y-h/3);
        vertex(x+w, y);
        endShape(CLOSE);
        break;
      case 1:
       beginShape();
        vertex(x, y);
        vertex(x+w/7, y-h/4);
        vertex(x+w/2, y-h/2);
        vertex(x+(w-w/7), y-h/4);
        vertex(x+w, y);
        endShape(CLOSE);
        break;
      case 2:
        ellipseMode(CORNER);
        arc(x, y-h/2, w, h, PI, TWO_PI);
        line(x, y, x+w, y);
        break;
      }
  
    }
  
    // set roof style
    void setStyle(int style){
      this.style = style;
    }
  }
  
  class House{
    //house properties
    int x;
    int y;
    int w;
    int h;
  
    //component reference variables
    Door door;
    Window window;
    Roof roof;
  
    //optional autosize variable
    boolean AutoSizeComponents = false;
  
    //door placement
    int doorLoc = 0;
    //constants
    final static int MIDDLE_DOOR = 0;
    final static int LEFT_DOOR = 1;
    final static int RIGHT_DOOR = 2;
  
    //constructor
    House(int w, int h, Door door, Window window, Roof roof, int doorLoc) {
      this.w = w;
      this.h = h;
      this.door = door;
      this.window = window;
      this.roof = roof;
      this.doorLoc = doorLoc;
    }
  
    void drawHouse(int x, int y, boolean AutoSizeComponents) {
      this.x = x;
      this.y =y;
      this.AutoSizeComponents = AutoSizeComponents;
  
      //automatically sizes doors and windows
      if(AutoSizeComponents){
        //autosize door
        door.h = h/4;
        door.w = door.h/2;
  
        //autosize windows
        window.h = h/3;
        window.w = window.h/2;
  
      }
      // draw bldg block
      rect(x, y, w, h);
  
      // draw door
      switch(doorLoc){
      case 0:
        door.drawDoor(x+w/2-door.w/2, y+h-door.h);
        break;
      case 1:
        door.drawDoor(x+w/8, y+h-door.h);
        break;
      case 2:
        door.drawDoor(x+w-w/8-door.w,  y+h-door.h);
        break;
      }
  
      // draw windows
      int windowMargin = (w-window.w*2)/3;
      window.drawWindow(x+windowMargin, y+h/6);
      window.drawWindow(x+windowMargin*2+window.w, y+h/6);
  
      // draw roof
      roof.drawRoof(x, y, w, h);
    }
  
    // catch drawHouse method without boolean argument
    void drawHouse(int x, int y){
      // recall with required 3rd argument
      drawHouse(x, y, false);
    }
  }