Add cell selection, auto camera placement, and FGridMath

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Source/Tactica/Private/GridCell.cpp

@@ -27,6 +27,7 @@ AGridCell::AGridCell()
 
 	// カーソルのレイキャスト(Visibilityチャンネル)に当たるようにする
 	MeshComponent->SetCollisionEnabled(ECollisionEnabled::QueryOnly);
+	MeshComponent->SetCollisionObjectType(ECC_WorldDynamic);
 	MeshComponent->SetCollisionResponseToAllChannels(ECR_Ignore);
 	MeshComponent->SetCollisionResponseToChannel(ECC_Visibility, ECR_Block);
 
@@ -44,14 +45,26 @@ void AGridCell::BeginPlay()
 	Super::BeginPlay();
 
 	DynamicMaterial = MeshComponent->CreateDynamicMaterialInstance(0);
-	SetHighlighted(false);
+	RefreshColor();
 }
 
-void AGridCell::SetHighlighted(bool bHighlighted)
+void AGridCell::SetHovered(bool bInHovered)
+{
+	bHovered = bInHovered;
+	RefreshColor();
+}
+
+void AGridCell::SetSelected(bool bInSelected)
+{
+	bSelected = bInSelected;
+	RefreshColor();
+}
+
+void AGridCell::RefreshColor()
 {
 	if (DynamicMaterial)
 	{
-		DynamicMaterial->SetVectorParameterValue(TEXT("Color"),
+		const FLinearColor& Color = bSelected ? SelectedColor : (bHovered ? HoverColor : NormalColor);
-			bHighlighted ? HighlightColor : NormalColor);
+		DynamicMaterial->SetVectorParameterValue(TEXT("Color"), Color);
 	}
 }

Source/Tactica/Private/GridManager.cpp

@@ -1,5 +1,6 @@
 #include "GridManager.h"
 #include "GridCell.h"
+#include "GridMath.h"
 #include "Engine/World.h"
 
 // このファイル専用のログカテゴリ
@@ -20,6 +21,21 @@ void AGridManager::BeginPlay()
 	GenerateGrid();
 }
 
+AGridCell* AGridManager::GetCellAt(FIntPoint Coord) const
+{
+	const int32 Index = FGridMath::CoordToIndex(Coord, GridSizeX, GridSizeY);
+	if (Cells.IsValidIndex(Index) && Cells[Index] && Cells[Index]->GridCoord == Coord)
+	{
+		return Cells[Index];
+	}
+	return nullptr;
+}
+
+FVector AGridManager::GetGridCenter() const
+{
+	return FGridMath::GetGridCenter(GetActorLocation(), GridSizeX, GridSizeY, CellSize);
+}
+
 void AGridManager::GenerateGrid()
 {
 	UWorld* World = GetWorld();
@@ -41,7 +57,7 @@ void AGridManager::GenerateGrid()
 	{
 		for (int32 X = 0; X < GridSizeX; ++X)
 		{
-			const FVector Location = Origin + FVector(X * CellSize, Y * CellSize, 0.0f);
+			const FVector Location = FGridMath::CellToWorld(FIntPoint(X, Y), Origin, CellSize);
 
 			FActorSpawnParameters Params;
 			Params.SpawnCollisionHandlingOverride =

Source/Tactica/Private/GridMath.cpp

@@ -0,0 +1,27 @@
+#include "GridMath.h"
+
+FVector FGridMath::CellToWorld(FIntPoint Coord, const FVector& Origin, float CellSize)
+{
+	return Origin + FVector(Coord.X * CellSize, Coord.Y * CellSize, 0.0f);
+}
+
+FIntPoint FGridMath::WorldToCell(const FVector& World, const FVector& Origin, float CellSize)
+{
+	const FVector Local = World - Origin;
+	return FIntPoint(FMath::RoundToInt(Local.X / CellSize), FMath::RoundToInt(Local.Y / CellSize));
+}
+
+bool FGridMath::IsInBounds(FIntPoint Coord, int32 SizeX, int32 SizeY)
+{
+	return Coord.X >= 0 && Coord.X < SizeX && Coord.Y >= 0 && Coord.Y < SizeY;
+}
+
+int32 FGridMath::CoordToIndex(FIntPoint Coord, int32 SizeX, int32 SizeY)
+{
+	return IsInBounds(Coord, SizeX, SizeY) ? Coord.Y * SizeX + Coord.X : INDEX_NONE;
+}
+
+FVector FGridMath::GetGridCenter(const FVector& Origin, int32 SizeX, int32 SizeY, float CellSize)
+{
+	return Origin + FVector((SizeX - 1) * CellSize * 0.5f, (SizeY - 1) * CellSize * 0.5f, 0.0f);
+}

Source/Tactica/Private/TacticaCameraPawn.cpp

@@ -1,5 +1,9 @@
 #include "TacticaCameraPawn.h"
 #include "Camera/CameraComponent.h"
+#include "GridManager.h"
+#include "Kismet/GameplayStatics.h"
+
+DEFINE_LOG_CATEGORY_STATIC(LogTacticaCamera, Log, All);
 
 ATacticaCameraPawn::ATacticaCameraPawn()
 {
@@ -7,9 +11,26 @@ ATacticaCameraPawn::ATacticaCameraPawn()
 
 	Camera = CreateDefaultSubobject<UCameraComponent>(TEXT("Camera"));
 	SetRootComponent(Camera);
-
+}
-	// 3x3グリッド(中心 (100,100))を斜め上から見下ろす位置。
+
-	// 配置したPawnのActor位置を変えれば調整できる
+void ATacticaCameraPawn::BeginPlay()
-	Camera->SetRelativeLocation(FVector(-250.0f, 100.0f, 450.0f));
+{
-	Camera->SetRelativeRotation(FRotator(-60.0f, 0.0f, 0.0f));
+	Super::BeginPlay();
+
+	const AGridManager* Grid = Cast<AGridManager>(
+		UGameplayStatics::GetActorOfClass(this, AGridManager::StaticClass()));
+	if (!Grid)
+	{
+		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"));
+		return;
+	}
+
+	// グリッドの長辺の半分(余白つき)が画角に収まる距離を求める
+	const float HalfExtent = FMath::Max(Grid->GridSizeX, Grid->GridSizeY) * Grid->CellSize * 0.5f * MarginScale;
+	const float HalfFovRad = FMath::DegreesToRadians(Camera->FieldOfView * 0.5f);
+	const float Distance = HalfExtent / FMath::Tan(HalfFovRad);
+
+	const FRotator Rotation(Pitch, 0.0f, 0.0f);
+	const FVector Location = Grid->GetGridCenter() - Rotation.Vector() * Distance;
+	SetActorLocationAndRotation(Location, Rotation);
 }

Source/Tactica/Private/TacticaPlayerController.cpp

@@ -33,19 +33,24 @@ void ATacticaPlayerController::PlayerTick(float DeltaTime)
 
 	if (HoveredCell)
 	{
-		HoveredCell->SetHighlighted(false);
+		HoveredCell->SetHovered(false);
 	}
 	HoveredCell = Cell;
 	if (HoveredCell)
 	{
-		HoveredCell->SetHighlighted(true);
+		HoveredCell->SetHovered(true);
 	}
 }
 
 AGridCell* ATacticaPlayerController::GetCellUnderCursor() const
 {
+	// マスはWorldDynamicのみを対象にする。
+	// 地形などWorldStaticと上面が同じ高さでも、そちらに邪魔されない
+	const TArray<TEnumAsByte<EObjectTypeQuery>> ObjectTypes = {
+		UEngineTypes::ConvertToObjectType(ECC_WorldDynamic) };
+
 	FHitResult Hit;
-	if (GetHitResultUnderCursor(ECC_Visibility, false, Hit))
+	if (GetHitResultUnderCursorForObjects(ObjectTypes, false, Hit))
 	{
 		return Cast<AGridCell>(Hit.GetActor());
 	}
@@ -54,9 +59,19 @@ AGridCell* ATacticaPlayerController::GetCellUnderCursor() const
 
 void ATacticaPlayerController::OnClick()
 {
-	if (const AGridCell* Cell = GetCellUnderCursor())
+	AGridCell* Cell = GetCellUnderCursor();
+	if (!Cell)
 	{
+		return; // マス以外のクリックでは選択を変えない
+	}
+
+	if (SelectedCell)
+	{
+		SelectedCell->SetSelected(false);
+	}
+	SelectedCell = Cell;
+	SelectedCell->SetSelected(true);
+
 	UE_LOG(LogTacticaInput, Log, TEXT("Cell clicked: (%d, %d)"),
 		Cell->GridCoord.X, Cell->GridCoord.Y);
-	}
 }

Source/Tactica/Public/GridCell.h

@@ -35,17 +35,27 @@ public:
 	UPROPERTY(EditAnywhere, Category = "Grid|Highlight")
 	FLinearColor NormalColor = FLinearColor(0.15f, 0.15f, 0.15f);
 
-	// ハイライト時の色
+	// ホバー時の色
 	UPROPERTY(EditAnywhere, Category = "Grid|Highlight")
-	FLinearColor HighlightColor = FLinearColor(1.0f, 0.8f, 0.1f);
+	FLinearColor HoverColor = FLinearColor(1.0f, 0.8f, 0.1f);
 
-	// ハイライトのON/OFF
+	// 選択時の色
-	void SetHighlighted(bool bHighlighted);
+	UPROPERTY(EditAnywhere, Category = "Grid|Highlight")
+	FLinearColor SelectedColor = FLinearColor(0.1f, 0.6f, 1.0f);
+
+	void SetHovered(bool bInHovered);
+	void SetSelected(bool bInSelected);
 
 protected:
 	virtual void BeginPlay() override;
 
 private:
+	// 状態から色を決めて反映する(優先順位: 選択 > ホバー > 通常)
+	void RefreshColor();
+
+	bool bHovered = false;
+	bool bSelected = false;
+
 	// 色変更用のダイナミックマテリアル
 	UPROPERTY()
 	TObjectPtr<UMaterialInstanceDynamic> DynamicMaterial;

Source/Tactica/Public/GridManager.h

@@ -38,6 +38,12 @@ public:
 	UPROPERTY(VisibleAnywhere, Category = "Grid")
 	TArray<TObjectPtr<AGridCell>> Cells;
 
+	// 座標のマスを返す(範囲外はnullptr)
+	AGridCell* GetCellAt(FIntPoint Coord) const;
+
+	// グリッド全体の中心(ワールド)
+	FVector GetGridCenter() const;
+
 private:
 	void GenerateGrid();
 };

Source/Tactica/Public/GridMath.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "CoreMinimal.h"
+
+// グリッドの座標計算。Actorに依存しない純粋なロジック
+// (将来のユニット移動や射線計算でも使う)
+struct TACTICA_API FGridMath
+{
+	// セル座標 → ワールド座標(セルの中心。Zは Origin.Z)
+	static FVector CellToWorld(FIntPoint Coord, const FVector& Origin, float CellSize);
+
+	// ワールド座標 → セル座標(四捨五入)
+	static FIntPoint WorldToCell(const FVector& World, const FVector& Origin, float CellSize);
+
+	// 範囲内か
+	static bool IsInBounds(FIntPoint Coord, int32 SizeX, int32 SizeY);
+
+	// 配列インデックス(Y * SizeX + X)。範囲外は INDEX_NONE
+	static int32 CoordToIndex(FIntPoint Coord, int32 SizeX, int32 SizeY);
+
+	// グリッド全体の中心(ワールド)
+	static FVector GetGridCenter(const FVector& Origin, int32 SizeX, int32 SizeY, float CellSize);
+};

Source/Tactica/Public/TacticaCameraPawn.h

@@ -6,7 +6,7 @@
 
 class UCameraComponent;
 
-// 固定の俯瞰カメラ
+// 固定の俯瞰カメラ。BeginPlayでグリッド全体が収まる位置に自動配置する
 UCLASS()
 class TACTICA_API ATacticaCameraPawn : public APawn
 {
@@ -17,4 +17,15 @@ public:
 
 	UPROPERTY(VisibleAnywhere, Category = "Camera")
 	TObjectPtr<UCameraComponent> Camera;
+
+	// 俯角(度。マイナスで見下ろす)
+	UPROPERTY(EditAnywhere, Category = "Camera")
+	float Pitch = -60.0f;
+
+	// グリッドに対する余白の倍率
+	UPROPERTY(EditAnywhere, Category = "Camera")
+	float MarginScale = 1.2f;
+
+protected:
+	virtual void BeginPlay() override;
 };

Source/Tactica/Public/TacticaPlayerController.h

@@ -24,7 +24,11 @@ private:
 
 	void OnClick();
 
-	// 現在ハイライト中のマス
+	// 現在ホバー中のマス
 	UPROPERTY()
 	TObjectPtr<AGridCell> HoveredCell;
+
+	// 現在選択中のマス
+	UPROPERTY()
+	TObjectPtr<AGridCell> SelectedCell;
 };