创建自定义组件

Follow the instructions given below to create you own custom component.请按照下面给出的说明创建您自己的自定义组件。

1. Create a new project using the IG Template as described here.使用IG Template和创建一个新项目组件系统如前所述这里。

   

2. 将以下用于组件系统的初始化代码添加到AppSystemLogic.cpp文件中的AppSystemLogic::init()方法中：

   源代码 (C++)

   virtual int AppSystemLogic::init()
   {
   	// initialize ComponentSystem and register all components
   	Unigine::ComponentSystem::get()->initialize();
   
   	/*...*/
   	
   	return 1;
   }

3. Create the following files describing your new component to the C++ project:创建（或添加）以下文件，以将您的新组件描述到C ++项目中：

   注意

   该组件应同时从ComponentBase和ComponentBaseInterface类继承。

   如果要同步组件（组件的内部状态，任何参数，命令等），则可以覆盖以下方法：

   • saveState() —用于代码写入组件的数据以同步到主服务器上的Blob。
   • restoreState() —用于从从站的blob读取数据的代码。
   • 

     WaterDropAircraftController.h

     源代码 (C++)

     #pragma once
     
     #include <UnigineGame.h>
     #include <plugins/Unigine/IG/UnigineIG.h>
     #include <UnigineComponentSystem.h>
     
     class WaterDropAircraftController final: public Unigine::ComponentBase
     {
     public:
     	COMPONENT(WaterDropAircraftController, Unigine::ComponentBase);
     	COMPONENT_INIT(init);
     	COMPONENT_UPDATE(update);
     	COMPONENT_SHUTDOWN(shutdown);
     	// Specifying the name of the property file and parameters for our component
     	PROP_NAME("WaterDropAircraftController");
     	PROP_PARAM(Toggle, open, false, "Open", "Input parameter for enabling/disabling the effect", "Input");
     	PROP_PARAM(Float, normalize_flow, 1.0f, "Normalize Flow", "Input parameter for the effect power normalization", "Input");
     	PROP_PARAM(Float, normalize_payload, 1.0f, "Normalize Payload", "Input parameter for payload normalization", "Input");
     
     	PROP_PARAM(Node, particles_system, "Particles System", "ObjectParticles with the effect", "Effect");
     	PROP_PARAM(Float, spawn_rate_factor, 100.0f, "Spawn Rate Factor", "Multiplier for spawn rate", "Effect");
     
     	PROP_PARAM(Toggle, controlled_payload_time, false, "Controlled Payload Time", "Enable: water effect can be stopped automatically", "Payload")
     	PROP_PARAM(Float, max_water_payload, 100.0f, "Max Water Payload", "Full water payload in units (weight or volume)", "Payload")
     	PROP_PARAM(Float, max_flow_speed, 1.0f, "Max Flow Speed", "Maximum water flow speed (units per second)", "Payload");
     private:
     	void init();
     	void update();
     	void shutdown();
     
     	// Declaring a callback on changing the property parameters
     	void parameterChanged(Unigine::PropertyPtr property, int propID);
     
     	void openWaterDropSystem(bool open);
     	void setWaterDropSystemFlow(float value);
     	void setWaterPayload(float value);
     
     private:
     	// Declaring a particle system to be used for the water drop effect
     	Unigine::ObjectParticlesPtr dropWaterEffect;
     
     	float current_payload = 0.0f;
     	Unigine::Plugins::IG::Manager *ig = nullptr;
     };

     WaterDropAircraftController.h

     源代码 (C++)

     #ifndef _WATER_DROP_AIRCRAFT_CONTROLLER_INCLUDED_
     #define _WATER_DROP_AIRCRAFT_CONTROLLER_INCLUDED_
     
     #include <UnigineGame.h>
     #include <plugins/Unigine/IG/UnigineIG.h>
     #include <UnigineComponentSystem.h>
     
     class WaterDropAircraftController final : public Unigine::ComponentBase, public Unigine::Plugins::IG::ComponentBaseInterface
     {
     public:
     	COMPONENT(WaterDropAircraftController, Unigine::ComponentBase);
     	COMPONENT_INIT(init);
     	COMPONENT_UPDATE(update);
     	COMPONENT_SHUTDOWN(shutdown);
     	
     	// Specifying the name of the property file and parameters for our component
     	PROP_NAME("WaterDropAircraftController");
     	PROP_PARAM(Toggle, open, false, "Open", "Input parameter for enabling/disabling the effect", "Input");
     	PROP_PARAM(Float, normalize_flow, 1.0f, "Normalize Flow", "Input parameter for the effect power normalization", "Input");
     	PROP_PARAM(Float, normalize_payload, 1.0f, "Normalize Payload", "Input parameter for payload normalization", "Input");
     
     	PROP_PARAM(Node, particles_system, "Particles System", "ObjectParticles with the effect", "Effect");
     	PROP_PARAM(Float, spawn_rate_factor, 100.0f, "Spawn Rate Factor", "Multiplier for spawn rate", "Effect");
     
     	PROP_PARAM(Toggle, controlled_payload_time, false, "Controlled Payload Time", "Enable: water effect can be stopped automatically", "Payload")
     	PROP_PARAM(Float, max_water_payload, 100.0f, "Max Water Payload", "Full water payload in units (weight or volume)", "Payload")
     	PROP_PARAM(Float, max_flow_speed, 1.0f, "Max Flow Speed", "Maximum water flow speed (units per second)", "Payload");
     
     private:
     	void init();
     	void update();
     	void shutdown();
     	
     	// Declaring a callback on changing the property parameters
     	void parameterChanged(Unigine::PropertyPtr property, int propID);
     
     	void openWaterDropSystem(bool open);
     	void setWaterDropSystemFlow(float value);
     	void setWaterPayload(float value);
     
     private:
     	// Declaring a particle system to be used for the water drop effect
     	Unigine::ObjectParticlesPtr dropWaterEffect;
     
     	float current_payload = 0.0f;
     	Unigine::Plugins::IG::Manager *ig = nullptr;
     
     	void saveState(const Unigine::BlobPtr &blob) override;
     	void restoreState(const Unigine::BlobPtr &blob) override;
     };
     
     #endif // _WATER_DROP_AIRCRAFT_CONTROLLER_INCLUDED_

   • 

     WaterDropAircraftController.cpp

     源代码 (C++)

     #include "WaterDropAircraftController.h"
     #include <UnigineProperties.h>
     #include <UnigineObjects.h>
     #include <UnigineEditor.h>
     // Registering the component in the Component System
     REGISTER_COMPONENT(WaterDropAircraftController);
     using namespace Unigine;
     
     void WaterDropAircraftController::init()
     {
     
     	// Adding a callback on changing the property parameters
     	getProperty()->addCallback(Property::CALLBACK_PARAMETER_CHANGED,
     		MakeCallback(this, &WaterDropAircraftController::parameterChanged));
     	// Creating a particle system for our effect and setting its parameters
     	dropWaterEffect = checked_ptr_cast<ObjectParticles>(particles_system.get());
     	if (!dropWaterEffect)
     		Log::error("WaterDropAircraftController::init(): particles_system node is not ObjectParticles!\n");
     	else
     		dropWaterEffect->setEmitterEnabled(false);
     
     	ig = Plugins::IG::Manager::get();
     }
     void WaterDropAircraftController::update()
     {
     	if (! dropWaterEffect || controlled_payload_time == 0 || open == 0 || normalize_flow <= 0 || current_payload <= 0)
     		return;
     
     	if (!dropWaterEffect->isEmitterEnabled())
     		dropWaterEffect->setEmitterEnabled(true);
     
     	// decrease current payload
     	current_payload -= ig->getIFps() * normalize_flow * max_flow_speed;
     
     	// if payload is empty - disable effect
     	if (current_payload < 0)
     		dropWaterEffect->setEmitterEnabled(false);
     }
     
     void WaterDropAircraftController::shutdown()
     {}
     
     /// Callback function to be executed on changing property parameters
     void WaterDropAircraftController::parameterChanged(Unigine::PropertyPtr prop, int propID)
     {
     	if (open.getID() == propID)
     		openWaterDropSystem(prop->getParameterPtr(propID)->getValueToggle());
     	else if (normalize_flow.getID() == propID)
     		setWaterDropSystemFlow(prop->getParameterPtr(propID)->getValueFloat());
     	else if (normalize_payload.getID() == propID)
     		setWaterPayload(prop->getParameterPtr(propID)->getValueFloat());
     }
     
     void WaterDropAircraftController::openWaterDropSystem(bool value)
     {
     	if (dropWaterEffect)
     		dropWaterEffect->setEmitterEnabled(value);
     }
     
     void WaterDropAircraftController::setWaterDropSystemFlow(float value)
     {
     	if (dropWaterEffect)
     		dropWaterEffect->setSpawnRate(value * spawn_rate_factor.get());
     }
     
     void WaterDropAircraftController::setWaterPayload(float value)
     {
     	current_payload = value * max_water_payload;
     }

     WaterDropAircraftController.cpp

     源代码 (C++)

     #include "WaterDropAircraftController.h"
     #include <UnigineProperties.h>
     #include <UnigineObjects.h>
     #include <UnigineEditor.h>
     // Registering the component in the Component System
     REGISTER_COMPONENT(WaterDropAircraftController);
     
     void WaterDropAircraftController::init()
     {
     	using namespace Unigine;
     	// Adding a callback on changing the property parameters
     	getProperty()->addCallback(Property::CALLBACK_PARAMETER_CHANGED,
     		MakeCallback(this, &WaterDropAircraftController::parameterChanged));
     
     	// Creating a particle system for our effect and setting its parameters
     	dropWaterEffect = checked_ptr_cast<ObjectParticles>(particles_system.get());
     	if (!dropWaterEffect)
     		Log::error("WaterDropAircraftController::init(): particles_system node is not ObjectParticles!\n");
     	else
     		dropWaterEffect->setEmitterEnabled(false);
     
     	ig = Plugins::IG::Manager::get();
     }
     
     void WaterDropAircraftController::update()
     {
     	if (! dropWaterEffect || controlled_payload_time == 0 || open == 0 || normalize_flow <= 0 || current_payload <= 0)
     		return;
     	
     	if (!dropWaterEffect->isEmitterEnabled())
     		dropWaterEffect->setEmitterEnabled(true);
     	
     	// decrease current payload
     	current_payload -= ig->getIFps() * normalize_flow * max_flow_speed;
     
     	// if payload is empty — disable effect
     	if (current_payload < 0)
     		dropWaterEffect->setEmitterEnabled(false);
     }
     
     void WaterDropAircraftController::shutdown()
     {}
     
     /// Callback function to be executed on changing property parameters
     void WaterDropAircraftController::parameterChanged(Unigine::PropertyPtr prop, int propID)
     {
     	if (open.getID() == propID)
     		openWaterDropSystem(prop->getParameterPtr(propID)->getValueToggle());
     	else if (normalize_flow.getID() == propID)
     		setWaterDropSystemFlow(prop->getParameterPtr(propID)->getValueFloat());
     	else if (normalize_payload.getID() == propID)
     		setWaterPayload(prop->getParameterPtr(propID)->getValueFloat());
     }
     
     void WaterDropAircraftController::openWaterDropSystem(bool value)
     {
     	if (dropWaterEffect)
     		dropWaterEffect->setEmitterEnabled(value);
     }
     
     void WaterDropAircraftController::setWaterDropSystemFlow(float value)
     {
     	if (dropWaterEffect)
     		dropWaterEffect->setSpawnRate(value * spawn_rate_factor.get());
     }
     
     void WaterDropAircraftController::setWaterPayload(float value)
     {
     	current_payload = value * max_water_payload;
     }
     
     void WaterDropAircraftController::saveState(const BlobPtr &blob)
     {
     	// master logic 
     	// when new slave is connected
     	blob->writeBool(open > 0);
     	blob->writeFloat(normalize_flow);
     	blob->writeFloat(current_payload);
     }
     
     void WaterDropAircraftController::restoreState(const BlobPtr &blob)
     {
     	// slave logic
     	// new slave received these parameters
     	open = blob->readBool();
     	normalize_flow = blob->readFloat();
     	current_payload = blob->readFloat();
     }

   In the header file (WaterDropAircraftController.h) define the name for the property file and describe parameters of the component:在头文件（WaterDropAircraftController.h）中定义属性文件的名称并描述组件的参数：

   源代码 (C++)

   // WaterDropAircraftController.h
   	// ...
       // Specifying the name of the property file and parameters for our component
       PROP_NAME("WaterDropAircraftController");
       PROP_PARAM(Toggle, open, false, "Open", "Input parameter for enabling/disabling the effect", "Input");
   	PROP_PARAM(Float, normalize_flow, 1.0f, "Normalize Flow", "Input parameter for the effect power normalization", "Input");
   	
   	// ...

   In the implementation file (WaterDropAircraftController.cpp) write your component's logic. At the initialization stage subscribe to parameter change event, as this component (property) will be associated with IG components changing these parameters when receiving commands from a host.在实现文件（WaterDropAircraftController.cpp）中，编写组件的逻辑。在初始化阶段，请订阅参数更改事件，因为当从主机接收命令时，此组件（属性）将与IG组件关联，这些IG组件会更改这些参数。

   源代码 (C++)

   // WaterDropAircraftController.cpp)
   	// ...
       
       void WaterDropAircraftController::init()
       {
       	using namespace Unigine;
   		
   		// Adding a callback on changing property parameters
       	getProperty()->addCallback(Property::CALLBACK_PARAMETER_CHANGED,
       		MakeCallback(this, &WaterDropAircraftController::parameterChanged));
               // ...
       }

4. Build and launch your project. At the initialization stage the Component System will create a property file named WaterDropAircraftController.prop for our component.生成并启动您的项目。在初始化阶段，组件系统将为我们的组件创建一个名为WaterDropAircraftController.prop的属性文件。

   源代码 (XML)

   <?xml version="1.0" encoding="utf-8"?>
   <property version="2.7.3.0" name="WaterDropAircraftController" manual="1" parent_name="node_base">
   	<parameter name="open" type="toggle" title="Open" tooltip="Input parameter for enabling/disabling the effect" group="Input">0</parameter>
   	<parameter name="normalize_flow" type="float" title="Normalize Flow" tooltip="Input parameter for the effect power normalization" group="Input">1</parameter>
   	<parameter name="normalize_payload" type="float" title="Normalize Payload" tooltip="Input parameter for payload normalization" group="Input">1</parameter>
   	<parameter name="particles_system" type="node" title="Particles System" tooltip="ObjectParticles with the effect" group="Effect">0</parameter>
   	<parameter name="spawn_rate_factor" type="float" title="Spawn Rate Factor" tooltip="Multiplier for spawn rate" group="Effect">100</parameter>
   	<parameter name="controlled_payload_time" type="toggle" title="Controlled Payload Time" tooltip="Enable: water effect can be stopped automatically" group="Payload">0</parameter>
   	<parameter name="max_water_payload" type="float" title="Max Water Payload" tooltip="Full water payload in units (weight or volume)" group="Payload">100</parameter>
   	<parameter name="max_flow_speed" type="float" title="Max Flow Speed" tooltip="Maximum water flow speed (units per second)" group="Payload">1</parameter>
   </property>

5. Via the UNIGINE Editor, assign the new created property file (WaterDropAircraftController.prop) to a node, for which the component was created (Be-200 in our case).通过UnigineEditor，将新创建的属性文件（WaterDropAircraftController.prop）分配给为其创建组件的节点（在本例中为Be-200）。

   Create a Particle System in the UNIGINE Editor and set its parameters as required. Add this Particle System to the corresponding field of the property.创建一个粒子系统在UnigineEditor中，并根据需要设置其参数。将此粒子系统添加到属性的相应字段。

   

6. Add the description of our component to the desired entity in the IG configuration file (ig_config.xml). Its name and parameters must correspond to the ones described in the component's header file (see Step 3).将我们组件的说明添加到所需的实体中IG配置文件（ig_config.xml）。其名称和参数必须与组件的头文件中描述的名称和参数相对应（请参见第三步） 。

   源代码 (XML)

   <!-- ..... -->
   	<entity id="200" name="be-200">
   		<!-- ..... -->
   		<component id="6" name="water_drop">
                   <property>WaterDropAircraftController</property>
                   <parameter name="state">open</parameter>
                   <parameter name="data1">normalize_flow</parameter>
                   <parameter name="data2">normalize_payload</parameter>
   				<!-- ..... -->
   		</component>
   		<!-- ..... -->
   	</entity>
   <!-- ..... -->

7. To test the new component, add its description to the configuration file of the host emulator (<path_to_host>/Default/Entities.def).要测试新组件，请将其描述添加到主机仿真器（<path_to_host>/Default/Entities.def）的配置文件中。

   注意

   组件ID必须与ig_config.xml中指定的ID相同。
   源代码

   entity
   {
   	name = "Be-200";
   	type = 200;
   	class = fixedwing;
           ....
           component
   	{
   		name = "water_drop";
   		id = 6;
   		def_state = 0;
   		state
   		{
   			name = "close";
   			value = 0;
   		}
   		state
   		{
   			name = "open";
   			value = 1;
   		}
   	}
   }

After launching your host application or a CIGI Host Emulator you can control your custom component by sending the corresponding packets to the IG.启动主机应用程序或CIGI Host Emulator后，您可以通过将相应的数据包发送到IG来控制自定义组件。