yuichipandaandClaude Sonnet 5.5
344e5e221f
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
#include "TacticaCameraPawn.h"
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#include "Camera/CameraComponent.h"
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#include "GridManager.h"
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#include "Engine/GameViewportClient.h"
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#include "Engine/World.h"
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#include "Kismet/GameplayStatics.h"
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DEFINE_LOG_CATEGORY_STATIC(LogTacticaCamera, Log, All);
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ATacticaCameraPawn::ATacticaCameraPawn()
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{
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PrimaryActorTick.bCanEverTick = false;
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Camera = CreateDefaultSubobject<UCameraComponent>(TEXT("Camera"));
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SetRootComponent(Camera);
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}
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void ATacticaCameraPawn::BeginPlay()
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{
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Super::BeginPlay();
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const AGridManager* Grid = Cast<AGridManager>(
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UGameplayStatics::GetActorOfClass(this, AGridManager::StaticClass()));
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if (!Grid)
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{
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UE_LOG(LogTacticaCamera, Warning, TEXT("AGridManager が見つかりません。カメラは配置されません"));
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return;
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}
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const FRotator Rotation(Pitch, 0.0f, 0.0f);
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const FVector Center = Grid->GetGridCenter();
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// 画面の縦横比(取れなければカメラの既定値)
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float Aspect = Camera->AspectRatio;
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if (const UWorld* World = GetWorld())
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{
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if (const UGameViewportClient* Viewport = World->GetGameViewport())
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{
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FVector2D Size;
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Viewport->GetViewportSize(Size);
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if (Size.X > 1.0f && Size.Y > 1.0f)
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{
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Aspect = Size.X / Size.Y;
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}
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}
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}
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// 横方向・縦方向の画角の半分のtan(余白の分だけ狭めて使う)
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const float TanH = FMath::Tan(FMath::DegreesToRadians(Camera->FieldOfView * 0.5f)) / MarginScale;
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const float TanV = TanH / FMath::Max(Aspect, 0.1f);
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// グリッドの四隅が画面に収まる最小の距離を求める。
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// 斜めに見下ろすので、手前の辺は近く、奥の辺は遠い(深さが違う)ことを考慮する
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const FRotationMatrix RotMatrix(Rotation);
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const FVector ViewDir = RotMatrix.GetUnitAxis(EAxis::X);
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const FVector Right = RotMatrix.GetUnitAxis(EAxis::Y);
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const FVector Up = RotMatrix.GetUnitAxis(EAxis::Z);
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const float HalfX = Grid->GridSizeX * Grid->CellSize * 0.5f;
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const float HalfY = Grid->GridSizeY * Grid->CellSize * 0.5f;
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float Distance = 0.0f;
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for (int32 SignX = -1; SignX <= 1; SignX += 2)
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{
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for (int32 SignY = -1; SignY <= 1; SignY += 2)
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{
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const FVector Offset(SignX * HalfX, SignY * HalfY, 0.0f);
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const float Depth = FVector::DotProduct(Offset, ViewDir); // 中心からの奥行きのずれ
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const float Lateral = FMath::Abs(FVector::DotProduct(Offset, Right));
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const float Vertical = FMath::Abs(FVector::DotProduct(Offset, Up));
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// 条件: Lateral <= (Distance + Depth) * TanH, Vertical <= (Distance + Depth) * TanV
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Distance = FMath::Max(Distance, Lateral / TanH - Depth);
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Distance = FMath::Max(Distance, Vertical / TanV - Depth);
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}
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}
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SetActorLocationAndRotation(Center - ViewDir * Distance, Rotation);
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}
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