建造者模式(Builder)

using System;
using System.Drawing;

namespace DPExample
{
 public abstract class PersonBuilder
 {
  protected Graphics g;
  protected Pen p;

  public PersonBuilder(Graphics g, Pen p)
  {
   this.g = g;
   this.p = p;
  }

  public abstract void BuildHead();
  public abstract void BuildBody();
  public abstract void BuildArmLeft();
  public abstract void BuildArmRight();
  public abstract void BuildLegLeft();
  public abstract void BuildLegRight();
 }

 class PersonThinBuilder : PersonBuilder
 {
  public PersonThinBuilder(Graphics g, Pen p) : base(g, p)
  {
  }

  public override void BuildHead()
  {
   g.DrawEllipse(p, 50, 20, 30, 30);
  }

  public override void BuildBody()
  {
   g.DrawRectangle(p, 60, 50, 10, 50);
  }

  public override void BuildArmLeft()
  {
   g.DrawLine (p, 60, 50, 40, 100);
  }

  public override void BuildArmRight ()
  {
   g.DrawLine (p, 70, 60, 90, 100);
  }

  public override void BuildLegLeft()
  {
   g.DrawLine (p, 60, 100, 45, 150);
  }

  public override void BuildLegRight()
  {
   g.DrawLine (p, 70, 100, 85, 150);
  }
 }

 class PersonFatBuilder : PersonBuilder
 {
  public PersonFatBuilder(Graphics g, Pen p) : base(g, p)
  {
  }

  public override void BuildHead()
  {
   g.DrawEllipse(p, 50, 20, 30, 30);
  }

  public override void BuildBody()
  {
   g.DrawRectangle(p, 45, 50, 40, 50);
  }

  public override void BuildArmLeft()
  {
   g.DrawLine (p, 50, 50, 30, 100);
  }

  public override void BuildArmRight ()
  {
   g.DrawLine (p, 80, 50, 30, 100);
  }

  public override void BuildLegLeft()
  {
   g.DrawLine (p, 60, 100, 45, 150);
  }

  public override void BuildLegRight()
  {
   g.DrawLine (p, 70, 100, 85, 150);
  }
 }

 class PersonDirector
 {
  private PersonBuilder pb;

  public PersonDirector(PersonBuilder pb)
  {
   this.pb = pb;
  }

  public void CreatePerson()
  {
   pb.BuildHead();
   pb.BuildBody ();
   pb.BuildArmLeft();
   pb.BuildArmRight ();
   pb.BuildLegLeft();
   pb.BuildLegRight();
  }
 }
}