树形图 
括号图 
思维笔记 
C4图
Mermaid C4图语法与 plantUML 兼容。请参阅下面的示例：
代码：
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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")
支持5种C4图：
- 系统上下文图（C4 Context）
- 容器图（C4 Container）
- 组件图（C4 Component）
- 动态图（C4 Dynamic）
- 部署图（C4 Deployment）
C4图是固定样式的，比如css颜色，所以不同皮肤下不会提供不同的css。updateElementStyle 和 UpdateElementStyle 写在图的最后部分。如果 updateElementStyle 与原来的定义不一致，会更新关系的样式，包括文本标签相对于原始位置的偏移。
该布局未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。每行的形状数量和边界数量可以使用 UpdateLayoutConfig 进行调整。
布局
- Lay_U, Lay_Up
- Lay_D, Lay_Down
- Lay_L, Lay_Left
- Lay_R, Lay_Right
C4系统上下文图（C4 Context）
代码：
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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（C4 Container）
代码：
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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 customers 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（C4 Component）
代码：
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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 to the internet banking functionality to customers via their 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（C4 Dynamic）
代码：
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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（C4 Deployment）
代码：
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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", "Microsoft 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")
