o3de/Gems/StartingPointCamera/Code/Source/CameraTargetAcquirers/AcquireByEntityId.cpp

/*
 * Copyright (c) Contributors to the Open 3D Engine Project.
 * For complete copyright and license terms please see the LICENSE at the root of this distribution.
 *
 * SPDX-License-Identifier: Apache-2.0 OR MIT
 *
 */

#include "AcquireByEntityId.h"
#include <AzCore/EBus/EBus.h>
#include <AzCore/Component/TransformBus.h>
#include <AzCore/Serialization/SerializeContext.h>
#include <AzCore/Serialization/EditContext.h>
#include <AzCore/Math/Transform.h>
#include <StartingPointCamera/StartingPointCameraConstants.h>

namespace Camera
{
    void AcquireByEntityId::Reflect(AZ::ReflectContext* reflection)
    {
        AZ::SerializeContext* serializeContext = azrtti_cast<AZ::SerializeContext*>(reflection);
        if (serializeContext)
        {
            // Deprecating the CameraTargetComponent.  This acquire behavior makes it obsolete
            serializeContext->ClassDeprecate("CameraTargetComponent", "{0D6A6574-4B79-4907-8529-EB61F343D957}");

            serializeContext->Class<AcquireByEntityId>()
                ->Version(1)
                ->Field("Entity Target", &AcquireByEntityId::m_target)
                ->Field("Use Target Rotation", &AcquireByEntityId::m_shouldUseTargetRotation)
                ->Field("Use Target Position", &AcquireByEntityId::m_shouldUseTargetPosition);

            AZ::EditContext* editContext = serializeContext->GetEditContext();
            if (editContext)
            {
                editContext->Class<AcquireByEntityId>("AcquireByEntityId", "Acquires a target by entity ref")
                    ->ClassElement(AZ::Edit::ClassElements::EditorData, "")
                        ->Attribute(AZ::Edit::Attributes::AutoExpand, true)
                    ->DataElement(AZ::Edit::UIHandlers::Default, &AcquireByEntityId::m_target, "Entity target", "Specify an entity to target")
                    ->DataElement(AZ::Edit::UIHandlers::Default, &AcquireByEntityId::m_shouldUseTargetRotation, "Use target rotation", "Set to false to not have the camera orient itself with the target")
                    ->DataElement(AZ::Edit::UIHandlers::Default, &AcquireByEntityId::m_shouldUseTargetPosition, "Use target position", "Set to false to not have the camera position itself with the target");
            }
        }
    }

    bool AcquireByEntityId::AcquireTarget(AZ::Transform& outTransformInformation)
    {
        if (m_target.IsValid())
        {
            AZ::Transform targetsTransform = AZ::Transform::Identity();
            AZ::TransformBus::EventResult(targetsTransform, m_target, &AZ::TransformInterface::GetWorldTM);
            if (m_shouldUseTargetPosition)
            {
                outTransformInformation.SetTranslation(targetsTransform.GetTranslation());
            }
            if (m_shouldUseTargetRotation)
            {
                const AZ::Vector3 translation = outTransformInformation.GetTranslation();
                outTransformInformation = targetsTransform;
                outTransformInformation.SetTranslation(translation);
            }
            return true;
        }
        return false;
    }
} // namespace Camera