使用C++在CryEngine 2中创建自定义Flow节点教程
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"这篇文档是关于在CryEngine 2中使用C++创建自定义Flow Node的教程，由Kevin“vloktboky”Kirst撰写。教程详细介绍了如何通过C++来扩展Flow Graph的功能，使得游戏逻辑和任务交互更加灵活，无需深入理解C++或Lua脚本语言。"
CryEngine 2是一款强大的游戏开发引擎，其内置的Flow-Graph系统允许设计者和程序员通过图形化界面构建复杂的逻辑，简化了游戏中的任务和环境交互设计。Flow-Graph提供了一个丰富的节点库，但有时开发者可能需要创建自己的定制节点以满足特殊需求。
**创建自定义Flow Node**
1. **需求**
在开始之前，你需要熟悉C++编程，并具备CryEngine 2 SDK的基本知识。自定义Flow Node的开发通常涉及与Flow System的集成，因此对CryEngine的内部工作原理有一定的理解是必要的。
2. **术语**
- **Flow Node**: Flow Graph中的基本单元，执行特定功能。
- **Flow Graph**: 一种图形化工具，用于连接Flow Nodes，构建逻辑流程。
- **Sandbox 2**: CryEngine 2的游戏编辑器。
- **SDK**: 软件开发工具包，包含用于开发CryEngine 2游戏的所有必要文件和文档。
3. **创建自定义Flow Node**
- **声明类**: 你需要定义一个C++类，继承自CFlowBaseNode或其子类，这是Flow Node的基础。
- **设置配置**: 定义节点的输入和输出端口，以及它们的行为。
- **处理事件**: 实现节点的逻辑，即当输入端口被触发时，节点应执行的操作。
- **注册到Flow System**: 将你的自定义节点注册到Flow Graph系统，这样它就能在Sandbox 2中使用。
例如，教程中提到的"StopWatch Node"是一个简单的示例，用于追踪时间流逝。这个节点将有一个启动（Start）输入端口，一个停止（Stop）输入端口，以及一个输出端口返回经过的时间。
4. **常见问题解答 (FAQ)** 和 **附录**
- **Appendix A** 包含了开发者可能遇到的常见问题及其解答。
- **Appendix B** 提供了源代码示例，如"MyFlowNodes.cpp"，以及一个使用自定义节点的示例图例"Example_RaceGraph.xml"，帮助读者更好地理解和实现自定义Flow Node。
通过这个教程，开发者可以学会如何利用C++扩展CryEngine 2的Flow Graph，创造出独特的游戏逻辑和互动体验，这对于制作独特模组或地图的创作者来说是非常有价值的。
3
Creating a Custom Flow Node
The StopWatch Node
Hopefully we’re all familiar with the concept of a stopwatch.
This wonderful tool aids us in determining the duration of time
between two events. Although you may be asking yourself,
“What purpose would I have for making a stopwatch in
Sandbox?” I feel this is a concept simple enough for our first
component node. And if you ever wanted to know how long it
would take a player to run from point A to point B on your map,
now you can figure that out!
You may have noticed I called this a component node. What I mean by this is no
physical entity will exist in your level that is a “stopwatch.” Instead, this stopwatch
be virtual and have no physical representation in the world.
Our StopWatch Node will have three Input Ports and one Output Port. They are
as followed:
Input Ports
Start – (Void) This will be a functional port that we will call when we want
to start the stopwatch.
Stop – (Void) This will be a functional port that we will call when we want
to end the stopwatch.
Timeout – (Float) This will be a data port that we will use to specify how
long the stopwatch can go before timing out.
Output Ports
Done – (Float) We will signal this port when the stopwatch has stopped.
The duration of time will be sent out through it.
We will use our stopwatch by signaling the Start input port to start the stopwatch
and the Stop input port to stop the stopwatch. The Timeout input port can be
used to specify how long the stopwatch will go before automatically stopping.
Keeping this value at 0 will allow the stopwatch to go on forever. Once the
stopwatch has stopped, the Done output port will be called with the time value,
allowing us to complete our behavior based on the amount of time that has
passed.
Now that we know how this node will function, let’s create it!
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