Migrating to UNIGINE from Unreal Engine: Programming

UCLASS()
class UMyComponent : public UActorComponent
{
    GENERATED_BODY()

    // Called after the owning Actor was created
    void InitializeComponent();

    // Called when the component or the owning Actor is being destroyed
    void UninitializeComponent();

    // Component version of Tick
    void TickComponent(float DeltaTime, enum ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction);
};

/* .. */
#include <UnigineComponentSystem.h>

/* .. */

int AppSystemLogic::init()
{
	// Write here code to be called on engine initialization.
	Unigine::ComponentSystem::get()->initialize();
	return 1;
}

#pragma once
#include <Unigine.h>
#include <UnigineComponentSystem.h>

using namespace Unigine;
class MyComponent : public ComponentBase
{
public:
	// declare the component
	COMPONENT(MyComponent, ComponentBase);

	// declare methods to be called at the corresponding stages of the execution sequence
	COMPONENT_INIT(init);
	COMPONENT_UPDATE(update);
	COMPONENT_SHUTDOWN(shutdown);

	// declare the name of the property to be used in the Editor
	PROP_NAME("my_component");
protected:
	void init();
	void update();
	void shutdown();
};

#include "MyComponent.h"

// register the component in the Component System
REGISTER_COMPONENT(MyComponent);

// called on component initialization
void MyComponent::init(){}

// called every frame
void MyComponent::update(){}

// called on component or the owning node is being destroyed
void MyComponent::shutdown(){}

UCLASS()
class AMyActor : public AActor
{
    GENERATED_BODY()

    // My trigger component
    UPROPERTY()
    UPrimitiveComponent* Trigger;

    AMyActor()
    {
        Trigger = CreateDefaultSubobject<USphereComponent>(TEXT("TriggerCollider"));

        // Both colliders need to have this set to true for events to fire
        Trigger.bGenerateOverlapEvents = true;

        // Set the collision mode for the collider
        // This mode will only enable the collider for raycasts, sweeps, and overlaps
        Trigger.SetCollisionEnabled(ECollisionEnabled::QueryOnly);
    }

    virtual void NotifyActorBeginOverlap(AActor* Other) override;

    virtual void NotifyActorEndOverlap(AActor* Other) override;
};

WorldTriggerPtr trigger;
int enter_callback_id;
				
// implement the enter callback
void AppWorldLogic::enter_callback(NodePtr node){
	Log::message("\nA node named %s has entered the trigger\n", node->getName());
}
				
// implement the leave callback
void AppWorldLogic::leave_callback(NodePtr node){
	Log::message("\nA node named %s has left the trigger\n", node->getName());
}
				
int AppWorldLogic::init() {
	// create a world trigger node
	trigger = WorldTrigger::create(Math::vec3(3.0f));
				
	// add the enter callback to be fired when a node enters the world trigger
	//and keep its id to be used to remove the callback when necessary
	enter_callback_id = trigger->addEnterCallback(MakeCallback(this, &AppWorldLogic::enter_callback));
	// add the leave callback to be fired when a node leaves the world trigger
	trigger->addLeaveCallback(MakeCallback(this, &AppWorldLogic::leave_callback));

	return 1;
}

UCLASS()
class AMyPlayerController : public APlayerController
{
    GENERATED_BODY()

    void SetupInputComponent()
    {
        Super::SetupInputComponent();

        InputComponent->BindAction("Fire", IE_Pressed, this, &AMyPlayerController::HandleFireInputEvent);
        InputComponent->BindAxis("Horizontal", this, &AMyPlayerController::HandleHorizontalAxisInputEvent);
        InputComponent->BindAxis("Vertical", this, &AMyPlayerController::HandleVerticalAxisInputEvent);
    }

    void HandleFireInputEvent();
    void HandleHorizontalAxisInputEvent(float Value);
    void HandleVerticalAxisInputEvent(float Value);
};

/* .. */

#include <UnigineApp.h>
#include <UnigineConsole.h>
#include <UnigineInput.h>

/* .. */

void MyInputController::update() 
{
	// if right mouse button is clicked
	if (Input::isMouseButtonDown(Input::MOUSE_BUTTON_RIGHT))
	{
		Math::ivec2 mouse = Input::getMouseCoord();
		// report mouse cursor coordinates to the console
		Log::message("Right mouse button was clicked at (%d, %d)\n", mouse.x, mouse.y);
	}
	
	// closing the application if a 'Q' key is pressed, ignoring the key if the console is opened
	if (Input::isKeyDown(Input::KEY_Q) && !Console::isActive())
	{
		App::exit();
	}
}

/* .. */

#include <Unigine.h>

/* .. */

void MyInputController::init() 
{
	// remapping states to other keys and buttons
	ControlsApp::setStateKey(Controls::STATE_FORWARD, App::KEY_PGUP);
	ControlsApp::setStateKey(Controls::STATE_BACKWARD, App::KEY_PGDOWN);
	ControlsApp::setStateKey(Controls::STATE_MOVE_LEFT, 'l');
	ControlsApp::setStateKey(Controls::STATE_MOVE_RIGHT, 'r');
	ControlsApp::setStateButton(Controls::STATE_JUMP, App::BUTTON_LEFT);
}

void MyInputController::update() 
{
	if (ControlsApp::clearState(Controls::STATE_FORWARD))
	{
		Log::message("FORWARD key pressed\n");
	}
	else if (ControlsApp::clearState(Controls::STATE_BACKWARD))
	{
		Log::message("BACKWARD key pressed\n");
	}
	else if (ControlsApp::clearState(Controls::STATE_MOVE_LEFT))
	{
		Log::message("MOVE_LEFT key pressed\n");
	}
	else if (ControlsApp::clearState(Controls::STATE_MOVE_RIGHT))
	{
		Log::message("MOVE_RIGHT key pressed\n");
	}
	else if (ControlsApp::clearState(Controls::STATE_JUMP))
	{
		Log::message("JUMP button pressed\n");
	}
}

/* .. */

APawn* AMyPlayerController::FindPawnCameraIsLookingAt()
{
    // You can use this to customize various properties about the trace
    FCollisionQueryParams Params;
    // Ignore the player's pawn
    Params.AddIgnoredActor(GetPawn());

    // The hit result gets populated by the line trace
    FHitResult Hit;

    // Raycast out from the camera, only collide with pawns (they are on the ECC_Pawn collision channel)
    FVector Start = PlayerCameraManager->GetCameraLocation();
    FVector End = Start + (PlayerCameraManager->GetCameraRotation().Vector() * 1000.0f);
    bool bHit = GetWorld()->LineTraceSingle(Hit, Start, End, ECC_Pawn, Params);

    if (bHit)
    {
        // Hit.Actor contains a weak pointer to the Actor that the trace hit
        return Cast<APawn>(Hit.Actor.Get());
    }

    return nullptr;
}

#include "MyComponent.h"
#include <UnigineWorld.h>
#include <UnigineVisualizer.h>
#include <UnigineGame.h>
#include <UnigineInput.h>

using namespace Unigine;
using namespace Math;

REGISTER_COMPONENT(MyComponent);

void MyComponent::init()
{
	Visualizer::setEnabled(true);
}

void MyComponent::update()
{
	ivec2 mouse = Input::getMouseCoord();
	float length = 100.0f;
	vec3 start = Game::getPlayer()->getWorldPosition();
	vec3 end = start + vec3(Game::getPlayer()->getDirectionFromScreen(mouse.x, mouse.y)) * length;

	// ignore surfaces that have certain bits of the Intersection mask enabled
	int mask = ~(1 << 2 | 1 << 4);

	WorldIntersectionNormalPtr intersection = WorldIntersectionNormal::create();

	ObjectPtr obj = World::getIntersection(start, end, mask, intersection);

	if (obj)
	{
		vec3 point = intersection->getPoint();
		vec3 normal = intersection->getNormal();
		Visualizer::renderVector(point, point + normal, vec4_one);
		Log::message("Hit %s at (%f,%f,%f)\n", obj->getName(), point.x, point.y, point.z);
	}
}