《大话设计模式》读书笔记-建造者模式

// 建造者类
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();
}
} abstract class PersonBuilder
{
// 建造人的抽象类
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();
}
// 瘦人类
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,70,50,90,100);
} public override void BuildLegLeft()
{
g.DrawLine(p,60,100,45,150);
} public override void BuildLegRight()
{
g.DrawLine(p,70,100,85,150);
}
}
Pen p = new Pen(Color.Black);
PersonThinBuilder ptb = new PersonThinBuilder(pictureBox1.CreateGraphics(), p);
PersonDirector pdThin = new PersonDirector(ptb);
pdThin.CreatePerson();
建造者模式：将一个复杂对象的构建与表示分离，使得同样的构建过程可以创建不同的表示。