C4 图表

C4 图：这是目前的实验图。语法和属性在未来的版本中可能会发生变化。当语法稳定时，将提供适当的文档。

Code Chart 的 c4 图表语法与 plantUML 兼容。请参见下面的示例：

    C4Context
      title System Context diagram for Internet Banking System
      Enterprise_Boundary(b0, "BankBoundary0") {
        Person(customerA, "Banking Customer A", "A customer of the bank, with personal bank accounts.")
        Person(customerB, "Banking Customer B")      
        Person_Ext(customerC, "Banking Customer C", "desc")            

        Person(customerD, "Banking Customer D", "A customer of the bank, <br/> with personal bank accounts.")

        System(SystemAA, "Internet Banking System", "Allows customers to view information about their bank accounts, and make payments.")  

        Enterprise_Boundary(b1, "BankBoundary") {
         
          SystemDb_Ext(SystemE, "Mainframe Banking System", "Stores all of the core banking information about customers, accounts, transactions, etc.")      

          System_Boundary(b2, "BankBoundary2") {  
            System(SystemA, "Banking System A")  
            System(SystemB, "Banking System B", "A system of the bank, with personal bank accounts. next line.")        
          } 

          System_Ext(SystemC, "E-mail system", "The internal Microsoft Exchange e-mail system.") 
          SystemDb(SystemD, "Banking System D Database", "A system of the bank, with personal bank accounts.") 

          Boundary(b3, "BankBoundary3", "boundary") {  
            SystemQueue(SystemF, "Banking System F Queue", "A system of the bank.")        
            SystemQueue_Ext(SystemG, "Banking System G Queue", "A system of the bank, with personal bank accounts.") 
          }
        }
      }
      
      BiRel(customerA, SystemAA, "Uses")
      BiRel(SystemAA, SystemE, "Uses")
      Rel(SystemAA, SystemC, "Sends e-mails", "SMTP")
      Rel(SystemC, customerA, "Sends e-mails to")

      UpdateElementStyle(customerA, $fontColor="red", $bgColor="grey", $borderColor="red")
      UpdateRelStyle(customerA, SystemAA, $textColor="blue", $lineColor="blue", $offsetX="5")
      UpdateRelStyle(SystemAA, SystemE, $textColor="blue", $lineColor="blue", $offsetY="-10")
      UpdateRelStyle(SystemAA, SystemC, $textColor="blue", $lineColor="blue", $offsetY="-40", $offsetX="-50")
      UpdateRelStyle(SystemC, customerA, $textColor="red", $lineColor="red", $offsetX="-50", $offsetY="20")
      
      UpdateLayoutConfig($c4ShapeInRow="3", $c4BoundaryInRow="1")

示例见源代码 demos/index.html

支持 5 种类型的 C4 图表。

• System Context (C4Context)
• Container diagram (C4Container)
• Component diagram (C4Component)
• Dynamic diagram (C4Dynamic)
• Deployment diagram (C4Deployment)

C4图是固定样式，比如css颜色，所以不同皮肤下不提供不同的css。updateElementStyle 和 UpdateElementStyle 写在图的最后一部分。updateElementStyle 与原始定义不一致，更新关系的样式，包括文本标签相对于原始位置的偏移量。

布局不使用全自动布局算法。形状的位置是通过改变语句的书写顺序来调整的。所以没有计划支持以下 Layout 语句。可以使用 UpdateLayoutConfig 调整每行的形状数和边界数。

• Layout
• • Lay_U, Lay_Up
• • Lay_D, Lay_Down
• • Lay_L, Lay_Left
• • Lay_R, Lay_Right

短期内不支持以下未完成的功能。

• sprite

• tags

• link

• Legend

• System Context

• • Person(alias, label, ?descr, ?sprite, ?tags, $link)
• • Person_Ext
• • System(alias, label, ?descr, ?sprite, ?tags, $link)
• • SystemDb
• • SystemQueue
• • System_Ext
• • SystemDb_Ext
• • SystemQueue_Ext
• • Boundary(alias, label, ?type, ?tags, $link)
• • Enterprise_Boundary(alias, label, ?tags, $link)
• • System_Boundary

• Container diagram

• • Container(alias, label, ?techn, ?descr, ?sprite, ?tags, $link)
• • ContainerDb
• • ContainerQueue
• • Container_Ext
• • ContainerDb_Ext
• • ContainerQueue_Ext
• • Container_Boundary(alias, label, ?tags, $link)

• Component diagram

• • Component(alias, label, ?techn, ?descr, ?sprite, ?tags, $link)
• • ComponentDb
• • ComponentQueue
• • Component_Ext
• • ComponentDb_Ext
• • ComponentQueue_Ext

• Dynamic diagram

• • RelIndex(index, from, to, label, ?tags, $link)

• Deployment diagram

• • Deployment_Node(alias, label, ?type, ?descr, ?sprite, ?tags, $link)
• • Node(alias, label, ?type, ?descr, ?sprite, ?tags, $link): short name of Deployment_Node()
• • Node_L(alias, label, ?type, ?descr, ?sprite, ?tags, $link): left aligned Node()
• • Node_R(alias, label, ?type, ?descr, ?sprite, ?tags, $link): right aligned Node()

• Relationship Types

• • Rel(from, to, label, ?techn, ?descr, ?sprite, ?tags, $link)
• • BiRel (bidirectional relationship)
• • Rel_U, Rel_Up
• • Rel_D, Rel_Down
• • Rel_L, Rel_Left
• • Rel_R, Rel_Right
• • Rel_Back
• • RelIndex * Compatible with C4-Plantuml syntax, but ignores the index parameter. The sequence number is determined by the order in which the rel statements are written.

• Custom tags/stereotypes support and skinparam updates
• • AddElementTag(tagStereo, ?bgColor, ?fontColor, ?borderColor, ?shadowing, ?shape, ?sprite, ?techn, ?legendText, ?legendSprite): Introduces a new element tag. The styles of the tagged elements are updated and the tag is displayed in the calculated legend.
• • AddRelTag(tagStereo, ?textColor, ?lineColor, ?lineStyle, ?sprite, ?techn, ?legendText, ?legendSprite): Introduces a new Relationship tag. The styles of the tagged relationships are updated and the tag is displayed in the calculated legend.
• • UpdateElementStyle(elementName, ?bgColor, ?fontColor, ?borderColor, ?shadowing, ?shape, ?sprite, ?techn, ?legendText, ?legendSprite): This call updates the default style of the elements (component, ...) and creates no additional legend entry.
• • UpdateRelStyle(from, to, ?textColor, ?lineColor, ?offsetX, ?offsetY): This call updates the default relationship colors and creates no additional legend entry. Two new parameters, offsetX and offsetY, are added to set the offset of the original position of the text.
• • RoundedBoxShape(): This call returns the name of the rounded box shape and can be used as ?shape argument.
• • EightSidedShape(): This call returns the name of the eight sided shape and can be used as ?shape argument.
• • DashedLine(): This call returns the name of the dashed line and can be used as ?lineStyle argument.
• • DottedLine(): This call returns the name of the dotted line and can be used as ?lineStyle argument.
• • BoldLine(): This call returns the name of the bold line and can be used as ?lineStyle argument.
• • UpdateLayoutConfig(?c4ShapeInRow, ?c4BoundaryInRow): New. This call updates the default c4ShapeInRow(4) and c4BoundaryInRow(2).

有两种方法可以用问号分配参数。一种是按参数顺序使用非命名参数赋值方法，另一种是命名参数赋值方法，其中名称必须以$符号开头。

示例：UpdateRelStyle(from, to, ?textColor, ?lineColor, ?offsetX, ?offsetY)

UpdateRelStyle(customerA, bankA, "red", "blue", "-40", "60")
UpdateRelStyle(customerA, bankA, $offsetX="-40", $offsetY="60", $lineColor="blue", $textColor="red")
UpdateRelStyle(customerA, bankA, $offsetY="60")

C4系统上下文图（C4Context）

    C4Context
      title System Context diagram for Internet Banking System
      Enterprise_Boundary(b0, "BankBoundary0") {
        Person(customerA, "Banking Customer A", "A customer of the bank, with personal bank accounts.")
        Person(customerB, "Banking Customer B")      
        Person_Ext(customerC, "Banking Customer C", "desc")            

        Person(customerD, "Banking Customer D", "A customer of the bank, <br/> with personal bank accounts.")

        System(SystemAA, "Internet Banking System", "Allows customers to view information about their bank accounts, and make payments.")  

        Enterprise_Boundary(b1, "BankBoundary") {
         
          SystemDb_Ext(SystemE, "Mainframe Banking System", "Stores all of the core banking information about customers, accounts, transactions, etc.")      

          System_Boundary(b2, "BankBoundary2") {  
            System(SystemA, "Banking System A")  
            System(SystemB, "Banking System B", "A system of the bank, with personal bank accounts. next line.")        
          } 

          System_Ext(SystemC, "E-mail system", "The internal Microsoft Exchange e-mail system.") 
          SystemDb(SystemD, "Banking System D Database", "A system of the bank, with personal bank accounts.") 

          Boundary(b3, "BankBoundary3", "boundary") {  
            SystemQueue(SystemF, "Banking System F Queue", "A system of the bank.")        
            SystemQueue_Ext(SystemG, "Banking System G Queue", "A system of the bank, with personal bank accounts.") 
          }
        }
      }
      
      BiRel(customerA, SystemAA, "Uses")
      BiRel(SystemAA, SystemE, "Uses")
      Rel(SystemAA, SystemC, "Sends e-mails", "SMTP")
      Rel(SystemC, customerA, "Sends e-mails to")

      UpdateElementStyle(customerA, $fontColor="red", $bgColor="grey", $borderColor="red")
      UpdateRelStyle(customerA, SystemAA, $textColor="blue", $lineColor="blue", $offsetX="5")
      UpdateRelStyle(SystemAA, SystemE, $textColor="blue", $lineColor="blue", $offsetY="-10")
      UpdateRelStyle(SystemAA, SystemC, $textColor="blue", $lineColor="blue", $offsetY="-40", $offsetX="-50")
      UpdateRelStyle(SystemC, customerA, $textColor="red", $lineColor="red", $offsetX="-50", $offsetY="20")
      
      UpdateLayoutConfig($c4ShapeInRow="3", $c4BoundaryInRow="1")

C4容器图（C4Container）

    C4Container
    title Container diagram for Internet Banking System

    System_Ext(email_system, "E-Mail System", "The internal Microsoft Exchange system", $tags="v1.0")
    Person(customer, Customer, "A customer of the bank, with personal bank accounts", $tags="v1.0")

    Container_Boundary(c1, "Internet Banking") {
        Container(spa, "Single-Page App", "JavaScript, Angular", "Provides all the Internet banking functionality to cutomers via their web browser")
        Container_Ext(mobile_app, "Mobile App", "C#, Xamarin", "Provides a limited subset of the Internet banking functionality to customers via their mobile device")
        Container(web_app, "Web Application", "Java, Spring MVC", "Delivers the static content and the Internet banking SPA")
        ContainerDb(database, "Database", "SQL Database", "Stores user registration information, hashed auth credentials, access logs, etc.")
        ContainerDb_Ext(backend_api, "API Application", "Java, Docker Container", "Provides Internet banking functionality via API")

    }

    System_Ext(banking_system, "Mainframe Banking System", "Stores all of the core banking information about customers, accounts, transactions, etc.")

    Rel(customer, web_app, "Uses", "HTTPS")
    UpdateRelStyle(customer, web_app, $offsetY="60", $offsetX="90")     
    Rel(customer, spa, "Uses", "HTTPS")
    UpdateRelStyle(customer, spa, $offsetY="-40")    
    Rel(customer, mobile_app, "Uses")
    UpdateRelStyle(customer, mobile_app, $offsetY="-30") 

    Rel(web_app, spa, "Delivers")
    UpdateRelStyle(web_app, spa, $offsetX="130") 
    Rel(spa, backend_api, "Uses", "async, JSON/HTTPS")
    Rel(mobile_app, backend_api, "Uses", "async, JSON/HTTPS")
    Rel_Back(database, backend_api, "Reads from and writes to", "sync, JDBC")

    Rel(email_system, customer, "Sends e-mails to")
    UpdateRelStyle(email_system, customer, $offsetX="-45")    
    Rel(backend_api, email_system, "Sends e-mails using", "sync, SMTP")
    UpdateRelStyle(backend_api, email_system, $offsetY="-60")    
    Rel(backend_api, banking_system, "Uses", "sync/async, XML/HTTPS")
    UpdateRelStyle(backend_api, banking_system, $offsetY="-50", $offsetX="-140") 

C4组件图（C4Component）

    C4Component
    title Component diagram for Internet Banking System - API Application

    Container(spa, "Single Page Application", "javascript and angular", "Provides all the internet banking functionality to customers via their web browser.")
    Container(ma, "Mobile App", "Xamarin", "Provides a limited subset ot the internet banking functionality to customers via their mobile mobile device.")
    ContainerDb(db, "Database", "Relational Database Schema", "Stores user registration information, hashed authentication credentials, access logs, etc.")
    System_Ext(mbs, "Mainframe Banking System", "Stores all of the core banking information about customers, accounts, transactions, etc.")

    Container_Boundary(api, "API Application") {
        Component(sign, "Sign In Controller", "MVC Rest Controller", "Allows users to sign in to the internet banking system")
        Component(accounts, "Accounts Summary Controller", "MVC Rest Controller", "Provides customers with a summary of their bank accounts")
        Component(security, "Security Component", "Spring Bean", "Provides functionality related to singing in, changing passwords, etc.")
        Component(mbsfacade, "Mainframe Banking System Facade", "Spring Bean", "A facade onto the mainframe banking system.")

        Rel(sign, security, "Uses")
        Rel(accounts, mbsfacade, "Uses")
        Rel(security, db, "Read & write to", "JDBC")
        Rel(mbsfacade, mbs, "Uses", "XML/HTTPS")
    }

    Rel_Back(spa, sign, "Uses", "JSON/HTTPS")
    Rel(spa, accounts, "Uses", "JSON/HTTPS")

    Rel(ma, sign, "Uses", "JSON/HTTPS")
    Rel(ma, accounts, "Uses", "JSON/HTTPS")

    UpdateRelStyle(spa, sign, $offsetY="-40") 
    UpdateRelStyle(spa, accounts, $offsetX="40", $offsetY="40")

    UpdateRelStyle(ma, sign, $offsetX="-90", $offsetY="40")
    UpdateRelStyle(ma, accounts, $offsetY="-40")

        UpdateRelStyle(sign, security, $offsetX="-160", $offsetY="10")
        UpdateRelStyle(accounts, mbsfacade, $offsetX="140", $offsetY="10")
        UpdateRelStyle(security, db, $offsetY="-40")
        UpdateRelStyle(mbsfacade, mbs, $offsetY="-40")

C4动态图（C4Dynamic）

    C4Dynamic
    title Dynamic diagram for Internet Banking System - API Application

    ContainerDb(c4, "Database", "Relational Database Schema", "Stores user registration information, hashed authentication credentials, access logs, etc.")
    Container(c1, "Single-Page Application", "JavaScript and Angular", "Provides all of the Internet banking functionality to customers via their web browser.")
    Container_Boundary(b, "API Application") {
      Component(c3, "Security Component", "Spring Bean", "Provides functionality Related to signing in, changing passwords, etc.")
      Component(c2, "Sign In Controller", "Spring MVC Rest Controller", "Allows users to sign in to the Internet Banking System.")
    }
    Rel(c1, c2, "Submits credentials to", "JSON/HTTPS")
    Rel(c2, c3, "Calls isAuthenticated() on")
    Rel(c3, c4, "select * from users where username = ?", "JDBC")

    UpdateRelStyle(c1, c2, $textColor="red", $offsetY="-40")
    UpdateRelStyle(c2, c3, $textColor="red", $offsetX="-40", $offsetY="60")
    UpdateRelStyle(c3, c4, $textColor="red", $offsetY="-40", $offsetX="10")

C4部署图（C4Deployment）

    C4Deployment
    title Deployment Diagram for Internet Banking System - Live

    Deployment_Node(mob, "Customer's mobile device", "Apple IOS or Android"){
        Container(mobile, "Mobile App", "Xamarin", "Provides a limited subset of the Internet Banking functionality to customers via their mobile device.")
    }

    Deployment_Node(comp, "Customer's computer", "Mircosoft Windows or Apple macOS"){
        Deployment_Node(browser, "Web Browser", "Google Chrome, Mozilla Firefox,<br/> Apple Safari or Microsoft Edge"){
            Container(spa, "Single Page Application", "JavaScript and Angular", "Provides all of the Internet Banking functionality to customers via their web browser.")
        }
    }

    Deployment_Node(plc, "Big Bank plc", "Big Bank plc data center"){
        Deployment_Node(dn, "bigbank-api*** x8", "Ubuntu 16.04 LTS"){
            Deployment_Node(apache, "Apache Tomcat", "Apache Tomcat 8.x"){
                Container(api, "API Application", "Java and Spring MVC", "Provides Internet Banking functionality via a JSON/HTTPS API.")
            }
        }
        Deployment_Node(bb2, "bigbank-web*** x4", "Ubuntu 16.04 LTS"){
            Deployment_Node(apache2, "Apache Tomcat", "Apache Tomcat 8.x"){
                Container(web, "Web Application", "Java and Spring MVC", "Delivers the static content and the Internet Banking single page application.")
            }
        }
        Deployment_Node(bigbankdb01, "bigbank-db01", "Ubuntu 16.04 LTS"){
            Deployment_Node(oracle, "Oracle - Primary", "Oracle 12c"){
                ContainerDb(db, "Database", "Relational Database Schema", "Stores user registration information, hashed authentication credentials, access logs, etc.")
            }
        }
        Deployment_Node(bigbankdb02, "bigbank-db02", "Ubuntu 16.04 LTS") {
            Deployment_Node(oracle2, "Oracle - Secondary", "Oracle 12c") {
                ContainerDb(db2, "Database", "Relational Database Schema", "Stores user registration information, hashed authentication credentials, access logs, etc.")
            }
        }
    }

    Rel(mobile, api, "Makes API calls to", "json/HTTPS")
    Rel(spa, api, "Makes API calls to", "json/HTTPS")
    Rel_U(web, spa, "Delivers to the customer's web browser")
    Rel(api, db, "Reads from and writes to", "JDBC")
    Rel(api, db2, "Reads from and writes to", "JDBC")
    Rel_R(db, db2, "Replicates data to")

    UpdateRelStyle(spa, api, $offsetY="-40")
    UpdateRelStyle(web, spa, $offsetY="-40")
    UpdateRelStyle(api, db, $offsetY="-20", $offsetX="5")
    UpdateRelStyle(api, db2, $offsetX="-40", $offsetY="-20")
    UpdateRelStyle(db, db2, $offsetY="-10")