设计模式随笔-蜡笔与毛笔的故事
2008-10-21 20:43
239 查看
我想大家小时候都有用蜡笔画画的经历吧。红红绿绿的蜡笔一大盒,根据想象描绘出格式图样。而毛笔下的国画更是工笔写意,各展风采。而今天我们的故事从蜡笔与毛笔说起。
设想要绘制一幅图画,蓝天、白云、绿树、小鸟,如果画面尺寸很大,那么用蜡笔绘制就会遇到点麻烦。毕竟细细的蜡笔要涂出一片蓝天,是有些麻烦。如果有可能,最好有套大号蜡笔,粗粗的蜡笔很快能涂抹完成。至于色彩吗,最好每种颜色来支粗的,除了蓝天还有绿地呢。这样,如果一套12种颜色的蜡笔,我们需要两套24支,同种颜色的一粗一细。呵呵,画还没画,开始做梦了:要是再有一套中号蜡笔就更好了,这样,不多不少总共36支蜡笔。
![](http://www.cnblogs.com/images/cnblogs_com/zhenyulu/PicX00100.gif)
再看看毛笔这一边,居然如此简陋:一套水彩12色,外加大中小三支毛笔。你可别小瞧这"简陋"的组合,画蓝天用大毛笔,画小鸟用小毛笔,各具特色。
![](http://www.cnblogs.com/images/cnblogs_com/zhenyulu/PicX00101.gif)
呵呵,您是不是已经看出来了,不错,我今天要说的就是Bridge模式。为了一幅画,我们需要准备36支型号不同的蜡笔,而改用毛笔三支就够了,当然还要搭配上12种颜料。通过Bridge模式,我们把乘法运算3×12=36改为了加法运算3+12=15,这一改进可不小。那么我们这里蜡笔和毛笔到底有什么区别呢?
实际上,蜡笔和毛笔的关键一个区别就在于笔和颜色是否能够分离。【GOF95】桥梁模式的用意是"将抽象化(Abstraction)与实现化(Implementation)脱耦,使得二者可以独立地变化"。关键就在于能否脱耦。蜡笔的颜色和蜡笔本身是分不开的,所以就造成必须使用36支色彩、大小各异的蜡笔来绘制图画。而毛笔与颜料能够很好的脱耦,各自独立变化,便简化了操作。在这里,抽象层面的概念是:"毛笔用颜料作画",而在实现时,毛笔有大中小三号,颜料有红绿蓝等12种,于是便可出现3×12种组合。每个参与者(毛笔与颜料)都可以在自己的自由度上随意转换。
蜡笔由于无法将笔与颜色分离,造成笔与颜色两个自由度无法单独变化,使得只有创建36种对象才能完成任务。Bridge模式将继承关系转换为组合关系,从而降低了系统间的耦合,减少了代码编写量。但这仅仅是Bridge模式带来的众多好处的一部分,更多层面的内容,请参考《设计模式(16)-Bridge Pattern》。
本文代码附于此处:
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
abstract class Brush
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
protected Color c;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public abstract void Paint();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public void SetColor(Color c)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{ this.c = c; }
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class BigBrush : Brush
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public override void Paint()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{ Console.WriteLine("Using big brush and color {0} painting
![](http://www.cnblogs.com/Images/dot.gif)
", c.color); }
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class SmallBrush : Brush
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public override void Paint()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{ Console.WriteLine("Using small brush and color {0} painting
![](http://www.cnblogs.com/Images/dot.gif)
", c.color); }
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class Color
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public string color;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class Red : Color
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public Red()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{ this.color = "red"; }
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class Blue : Color
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public Blue()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{ this.color = "blue"; }
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class Green : Color
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public Green()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{ this.color = "green"; }
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class Client
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public static void Main()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Brush b = new BigBrush();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.SetColor(new Red());
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.Paint();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.SetColor(new Blue());
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.Paint();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.SetColor(new Green());
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.Paint();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b = new SmallBrush();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.SetColor(new Red());
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.Paint();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.SetColor(new Blue());
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.Paint();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.SetColor(new Green());
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.Paint();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
设想要绘制一幅图画,蓝天、白云、绿树、小鸟,如果画面尺寸很大,那么用蜡笔绘制就会遇到点麻烦。毕竟细细的蜡笔要涂出一片蓝天,是有些麻烦。如果有可能,最好有套大号蜡笔,粗粗的蜡笔很快能涂抹完成。至于色彩吗,最好每种颜色来支粗的,除了蓝天还有绿地呢。这样,如果一套12种颜色的蜡笔,我们需要两套24支,同种颜色的一粗一细。呵呵,画还没画,开始做梦了:要是再有一套中号蜡笔就更好了,这样,不多不少总共36支蜡笔。
![](http://www.cnblogs.com/images/cnblogs_com/zhenyulu/PicX00100.gif)
再看看毛笔这一边,居然如此简陋:一套水彩12色,外加大中小三支毛笔。你可别小瞧这"简陋"的组合,画蓝天用大毛笔,画小鸟用小毛笔,各具特色。
![](http://www.cnblogs.com/images/cnblogs_com/zhenyulu/PicX00101.gif)
呵呵,您是不是已经看出来了,不错,我今天要说的就是Bridge模式。为了一幅画,我们需要准备36支型号不同的蜡笔,而改用毛笔三支就够了,当然还要搭配上12种颜料。通过Bridge模式,我们把乘法运算3×12=36改为了加法运算3+12=15,这一改进可不小。那么我们这里蜡笔和毛笔到底有什么区别呢?
实际上,蜡笔和毛笔的关键一个区别就在于笔和颜色是否能够分离。【GOF95】桥梁模式的用意是"将抽象化(Abstraction)与实现化(Implementation)脱耦,使得二者可以独立地变化"。关键就在于能否脱耦。蜡笔的颜色和蜡笔本身是分不开的,所以就造成必须使用36支色彩、大小各异的蜡笔来绘制图画。而毛笔与颜料能够很好的脱耦,各自独立变化,便简化了操作。在这里,抽象层面的概念是:"毛笔用颜料作画",而在实现时,毛笔有大中小三号,颜料有红绿蓝等12种,于是便可出现3×12种组合。每个参与者(毛笔与颜料)都可以在自己的自由度上随意转换。
蜡笔由于无法将笔与颜色分离,造成笔与颜色两个自由度无法单独变化,使得只有创建36种对象才能完成任务。Bridge模式将继承关系转换为组合关系,从而降低了系统间的耦合,减少了代码编写量。但这仅仅是Bridge模式带来的众多好处的一部分,更多层面的内容,请参考《设计模式(16)-Bridge Pattern》。
本文代码附于此处:
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System;
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
abstract class Brush
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
protected Color c;
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public abstract void Paint();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public void SetColor(Color c)
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{ this.c = c; }
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class BigBrush : Brush
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public override void Paint()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{ Console.WriteLine("Using big brush and color {0} painting
![](http://www.cnblogs.com/Images/dot.gif)
", c.color); }
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class SmallBrush : Brush
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public override void Paint()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{ Console.WriteLine("Using small brush and color {0} painting
![](http://www.cnblogs.com/Images/dot.gif)
", c.color); }
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class Color
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public string color;
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class Red : Color
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public Red()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{ this.color = "red"; }
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class Blue : Color
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public Blue()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{ this.color = "blue"; }
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class Green : Color
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public Green()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{ this.color = "green"; }
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class Client
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
public static void Main()
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif)
![](http://www.cnblogs.com/Images/dot.gif)
{
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Brush b = new BigBrush();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.SetColor(new Red());
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.Paint();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.SetColor(new Blue());
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.Paint();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.SetColor(new Green());
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.Paint();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b = new SmallBrush();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.SetColor(new Red());
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.Paint();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.SetColor(new Blue());
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.Paint();
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.SetColor(new Green());
![](http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
b.Paint();
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
}
![](http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
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