92 lines
3.0 KiB
C++
92 lines
3.0 KiB
C++
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// Copyright Epic Games, Inc. All Rights Reserved.
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#include "LyraReticleWidgetBase.h"
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#include "Weapons/LyraWeaponInstance.h"
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#include "Weapons/LyraRangedWeaponInstance.h"
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#include "Inventory/LyraInventoryItemInstance.h"
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ULyraReticleWidgetBase::ULyraReticleWidgetBase(const FObjectInitializer& ObjectInitializer)
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: Super(ObjectInitializer)
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{
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}
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void ULyraReticleWidgetBase::InitializeFromWeapon(ULyraWeaponInstance* InWeapon)
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{
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WeaponInstance = InWeapon;
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InventoryInstance = nullptr;
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if (WeaponInstance)
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{
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InventoryInstance = Cast<ULyraInventoryItemInstance>(WeaponInstance->GetInstigator());
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}
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OnWeaponInitialized();
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}
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float ULyraReticleWidgetBase::ComputeSpreadAngle() const
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{
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if (const ULyraRangedWeaponInstance* RangedWeapon = Cast<const ULyraRangedWeaponInstance>(WeaponInstance))
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{
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const float BaseSpreadAngle = RangedWeapon->GetCalculatedSpreadAngle();
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const float SpreadAngleMultiplier = RangedWeapon->GetCalculatedSpreadAngleMultiplier();
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const float ActualSpreadAngle = BaseSpreadAngle * SpreadAngleMultiplier;
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return ActualSpreadAngle;
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}
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else
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{
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return 0.0f;
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}
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}
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bool ULyraReticleWidgetBase::HasFirstShotAccuracy() const
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{
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if (const ULyraRangedWeaponInstance* RangedWeapon = Cast<const ULyraRangedWeaponInstance>(WeaponInstance))
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{
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return RangedWeapon->HasFirstShotAccuracy();
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}
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else
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{
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return false;
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}
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}
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float ULyraReticleWidgetBase::ComputeMaxScreenspaceSpreadRadius() const
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{
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const float LongShotDistance = 10000.f;
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APlayerController* PC = GetOwningPlayer();
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if (PC && PC->PlayerCameraManager)
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{
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// A weapon's spread can be thought of as a cone shape. To find the screenspace spread for reticle visualization,
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// we create a line on the edge of the cone at a long distance. The end of that point is on the edge of the cone's circle.
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// We then project it back onto the screen. Its distance from screen center is the spread radius.
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// This isn't perfect, due to there being some distance between the camera location and the gun muzzle.
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const float SpreadRadiusRads = FMath::DegreesToRadians(ComputeSpreadAngle() * 0.5f);
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const float SpreadRadiusAtDistance = FMath::Tan(SpreadRadiusRads) * LongShotDistance;
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FVector CamPos;
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FRotator CamOrient;
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PC->PlayerCameraManager->GetCameraViewPoint(CamPos, CamOrient);
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FVector CamForwDir = CamOrient.RotateVector(FVector::ForwardVector);
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FVector CamUpDir = CamOrient.RotateVector(FVector::UpVector);
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FVector OffsetTargetAtDistance = CamPos + (CamForwDir * LongShotDistance) + (CamUpDir * SpreadRadiusAtDistance);
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FVector2D OffsetTargetInScreenspace;
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if (PC->ProjectWorldLocationToScreen(OffsetTargetAtDistance, OffsetTargetInScreenspace, true))
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{
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int32 ViewportSizeX(0), ViewportSizeY(0);
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PC->GetViewportSize(ViewportSizeX, ViewportSizeY);
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const FVector2D ScreenSpaceCenter(FVector::FReal(ViewportSizeX) * 0.5f, FVector::FReal(ViewportSizeY) * 0.5f);
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return (OffsetTargetInScreenspace - ScreenSpaceCenter).Length();
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}
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}
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return 0.0f;
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}
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