Beginnings of a better dash

SwordNGun/Source/SwordNGun/Private/Components/SNGCharacterMovementComponent.cpp

@@ -3,6 +3,7 @@
 
 #include "Components/SNGCharacterMovementComponent.h"
 
+#include "GameFramework/Character.h"
 #include "Kismet/KismetMathLibrary.h"
 #include "PhysicsEngine/PhysicsSettings.h"
 
@@ -32,8 +33,17 @@ USNGCharacterMovementComponent::USNGCharacterMovementComponent()
 	// jump
 	MaxJumpHeight = 250.0f;
 	DesiredJumpDuration = 0.75f;
-	ComputerGravityScaleAndJumpZVelocity();
+	ComputeGravityScaleAndJumpZVelocity();
 
+	// dash
+	DashVelocity = 1000.0f;
+	DashGroundFriction = 0.0f;
+	DashGravityScale = 0.1f;
+	DashFloatTime = 0.2f;
+	DashSlideTime = 0.5f;
+	DashGravityToDefaultSpeed = 5.0f;
+	DashGroundFrictionToDefaultSpeed = 5.0f;
+	
 	/*
 	// not used...yet
 	MinJumpHeight = 200.0f;
@@ -58,14 +68,33 @@ USNGCharacterMovementComponent::USNGCharacterMovementComponent()
  */
 void USNGCharacterMovementComponent::RestoreMovementDefaults()
 {
-	GroundFriction = DefaultGroundFriction;
-	GravityScale = DefaultGravityScale;
+	GroundFriction = TargetGroundFriction = DefaultGroundFriction;
+	GravityScale = TargetGravityScale = DefaultGravityScale;
 	RotationRate = DefaultRotationRate;
-	MaxWalkSpeed = DefaultMaxWalkSpeed;
+	MaxWalkSpeed = TargetMaxWalkSpeed = DefaultMaxWalkSpeed;
 	AirControl = DefaultAirControl;
 	JumpZVelocity = DefaultJumpZVelocity;
 }
 
+void USNGCharacterMovementComponent::Dash()
+{
+	GroundFriction = DashGroundFriction;
+	GravityScale = DashGravityScale;
+	FloatTime = DashFloatTime;
+	SlideTime = DashSlideTime;
+
+	// sets gravity and friction targets which will start interpolating after float time and slide time elapse respectively
+	TargetGravityScale = DefaultGravityScale;
+	TargetGroundFriction = DefaultGroundFriction;
+	GravityScaleInterpSpeed = DashGravityToDefaultSpeed;
+	GroundFrictionInterpSpeed = DashGroundFrictionToDefaultSpeed;
+	
+	FRotator CharacterRot = FRotator(0.0f, GetCharacterOwner()->GetActorRotation().Yaw, 0.0f);
+	FVector LaunchDir = FVector(UKismetMathLibrary::GetForwardVector(CharacterRot));
+	LaunchDir.Normalize();
+	Launch(LaunchDir * DashVelocity);
+}
+
 #if WITH_EDITOR
 void USNGCharacterMovementComponent::PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent)
 {
@@ -76,7 +105,7 @@ void USNGCharacterMovementComponent::PostEditChangeProperty(FPropertyChangedEven
 		PropertyThatChanged && PropertyThatChanged->GetFName() == GET_MEMBER_NAME_CHECKED(USNGCharacterMovementComponent, DesiredJumpDuration))
 	{
 		// Compute WalkableFloorZ from the Angle.
-		ComputerGravityScaleAndJumpZVelocity();
+		ComputeGravityScaleAndJumpZVelocity();
 	}
 }
 
@@ -85,16 +114,17 @@ void USNGCharacterMovementComponent::PostLoad()
 	Super::PostLoad();
 
 	// Compute gravity scale and jump z velocity for first time
-	ComputerGravityScaleAndJumpZVelocity();
+	ComputeGravityScaleAndJumpZVelocity();
 }
 #endif // WITH_EDITOR
 
 void USNGCharacterMovementComponent::OnSprintTimer()
 {
 	bIsSprinting = true;
+	TargetMaxWalkSpeed = SprintingMaxWalkSpeed;
 }
 
-void USNGCharacterMovementComponent::ComputerGravityScaleAndJumpZVelocity()
+void USNGCharacterMovementComponent::ComputeGravityScaleAndJumpZVelocity()
 {
 	float HalfJumpDuration = DesiredJumpDuration / 2.0f;
 	DefaultJumpZVelocity = (2 * MaxJumpHeight) / HalfJumpDuration;
@@ -125,6 +155,44 @@ void USNGCharacterMovementComponent::AddJumpForce()
 	*/
 }
 
+void USNGCharacterMovementComponent::InterpolateMovementParameters(float DeltaTime)
+{
+	// set walk speed
+	MaxWalkSpeed = FMath::FInterpTo(MaxWalkSpeed, TargetMaxWalkSpeed, DeltaTime, MaxWalkSpeedInterpSpeed);
+
+	// ground friction
+	if(SlideTime > 0.0f)
+	{
+		SlideTime = FMath::Max(SlideTime - DeltaTime * GetCharacterOwner()->CustomTimeDilation, 0.0f);
+	}
+	else
+	{
+		GroundFriction = FMath::FInterpTo(GroundFriction, TargetGroundFriction, DeltaTime, GroundFrictionInterpSpeed);
+	}
+
+	// gravity scale
+	if(FloatTime > 0.0f)
+	{
+		FloatTime = FMath::Max(FloatTime - DeltaTime * GetCharacterOwner()->CustomTimeDilation, 0.0f);
+	}
+	else
+	{
+		GravityScale = FMath::FInterpTo(GravityScale, TargetGravityScale, DeltaTime, GravityScaleInterpSpeed);
+	}
+	
+	// set rotation rate
+	// NOTE(kevin): since default rotate rate is 360 RInterpTo will go from 0 to 180 instead of 360 to 180
+	// need to think of a way to prevent this
+	// might just need to do my own interp manually
+	/*
+	FRotator TargetRotationRate = bIsSprinting ? SprintingRotationRate : DefaultRotationRate;
+	FRotator NewRotationRate = FMath::RInterpTo(RotationRate, TargetRotationRate, DeltaTime, WalkToSprintInterpSpeed);
+	RotationRate = NewRotationRate;
+	*/
+
+	// gravity
+}
+
 void USNGCharacterMovementComponent::BeginPlay()
 {
 	Super::BeginPlay();
@@ -139,30 +207,23 @@ void USNGCharacterMovementComponent::TickComponent(float DeltaTime, ELevelTick T
 	Super::TickComponent(DeltaTime, Tick, ThisTickFunction);
 
 	float LateralSpeed = Velocity.Size2D();
-	if(LateralSpeed >= SprintLateralSpeedThreshold && !GetWorld()->GetTimerManager().IsTimerActive(TimerHandle_SprintTimer) )
+	if(LateralSpeed >= SprintLateralSpeedThreshold && !GetWorld()->GetTimerManager().IsTimerActive(TimerHandle_SprintTimer))
 	{
 		GetWorld()->GetTimerManager().SetTimer(TimerHandle_SprintTimer,
 			this, &USNGCharacterMovementComponent::OnSprintTimer,
 			TimeToInitiateSprint, false);
 	}
-
-	if(LateralSpeed < SprintLateralSpeedThreshold && GetWorld()->GetTimerManager().IsTimerActive(TimerHandle_SprintTimer))
+	
+	if(LateralSpeed < SprintLateralSpeedThreshold)
 	{
-		GetWorld()->GetTimerManager().ClearTimer(TimerHandle_SprintTimer);
+		if(GetWorld()->GetTimerManager().IsTimerActive(TimerHandle_SprintTimer))
+		{
+			GetWorld()->GetTimerManager().ClearTimer(TimerHandle_SprintTimer);
+		}
 		bIsSprinting = false;
+		TargetMaxWalkSpeed = DefaultMaxWalkSpeed;
+		MaxWalkSpeedInterpSpeed = WalkToSprintInterpSpeed;
 	}
 	
-	// set walk speed and rotation rate depending on whether player is sprinting or not
-	float TargetMaxWalkSpeed = bIsSprinting ? SprintingMaxWalkSpeed : DefaultMaxWalkSpeed;
-	float NewMaxWalkSpeed = FMath::FInterpTo(MaxWalkSpeed, TargetMaxWalkSpeed, DeltaTime, WalkToSprintInterpSpeed);
-	MaxWalkSpeed = NewMaxWalkSpeed;
-
-	// NOTE(kevin): since default rotate rate is 360 RInterpTo will go from 0 to 180 instead of 360 to 180
-	// need to think of a way to prevent this
-	// might just need to do my own interp manually
-	/*
-	FRotator TargetRotationRate = bIsSprinting ? SprintingRotationRate : DefaultRotationRate;
-	FRotator NewRotationRate = FMath::RInterpTo(RotationRate, TargetRotationRate, DeltaTime, WalkToSprintInterpSpeed);
-	RotationRate = NewRotationRate;
-	*/
+	InterpolateMovementParameters(DeltaTime);
 }

SwordNGun/Source/SwordNGun/Public/Characters/SNGCharacterBase.h

@@ -36,7 +36,10 @@ protected:
 
 	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Animations")
 	UAnimMontage* JumpBackMontage;
-
+	
+	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Animations")
+	UAnimMontage* DashMontage;
+	
 	UPROPERTY(BlueprintReadWrite)
 	bool CanMove;
 
@@ -64,7 +67,7 @@ protected:
 	void LookUpRate(float Value);
 	
 	void StartJump();
-
+	
 	virtual void Landed(const FHitResult& Hit) override;
 	
 	// Called when the game starts or when spawned

SwordNGun/Source/SwordNGun/Public/Components/SNGCharacterMovementComponent.h

@@ -28,6 +28,9 @@ public:
 	 */
 	UFUNCTION(BlueprintCallable)
 	void RestoreMovementDefaults();
+
+	UFUNCTION(BlueprintCallable)
+	void Dash();
 	
 	/**
 	 *	Gets bool whether the character is currently in the sprinting state
@@ -39,48 +42,66 @@ public:
 	virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;
 #endif // WITH_EDITOR
 
-
-	
 protected:
 	// default ground 
 	/** Default friction when not performing any special actions and on the ground */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Ground|Defaults", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Defaults|Ground", meta=(ClampMin="0", UIMin="0"))
 	float DefaultGroundFriction;
+
+	/** Ground friction we want character to interpolate to. Interpolated based on GroundFrictionInterpSpeed. */
+	UPROPERTY(BlueprintReadWrite)
+	float TargetGroundFriction;
+
+	/** How fast current GroundFriction will be interpolated to TargetGroundFriction */
+	UPROPERTY(BlueprintReadWrite)
+	float GroundFrictionInterpSpeed;
+
+	/** Timer used to determine when to start interpolating GroundFriction back to TargetGroundFriction */
+	UPROPERTY(BlueprintReadWrite)
+	float SlideTime;
 	
 	/** Default ground walk speed when not performing any special actions */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Ground|Defaults", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Defaults|Ground", meta=(ClampMin="0", UIMin="0"))
 	float DefaultMaxWalkSpeed;
 
+	/** Current MaxWalkSpeed we want to character to walk at. Interpolated based on MaxWalkSpeedInterpSpeed. */
+	UPROPERTY(BlueprintReadWrite)
+	float TargetMaxWalkSpeed;
+
+	UPROPERTY(BlueprintReadWrite)
+	/** How fast current MaxWalkSpeed will be interpolated to TargetMaxWalkSpeed */
+	float MaxWalkSpeedInterpSpeed;
+	
 	/** Default ground walk speed when not performing any special actions */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Ground|Defaults", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Defaults|Ground", meta=(ClampMin="0", UIMin="0"))
 	FRotator DefaultRotationRate;
 	
 	// sprinting 
 	/** Ground walk speed when sprinting */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Ground|Sprint", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Sprint", meta=(ClampMin="0", UIMin="0"))
 	float SprintingMaxWalkSpeed;
 
 	/** Lateral speed the player needs to maintain to stay in the sprinting state */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Ground|Sprint", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Sprint", meta=(ClampMin="0", UIMin="0"))
 	float SprintLateralSpeedThreshold;
 
 	/** Default ground walk speed when not performing any special actions */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Ground|Sprint", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Sprint", meta=(ClampMin="0", UIMin="0"))
 	FRotator SprintingRotationRate;
 	
 	/** How long after applying movement input should the character start sprinting? */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Ground|Sprint", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Sprint", meta=(ClampMin="0", UIMin="0"))
 	float TimeToInitiateSprint;
 
 	/** The speed in which the max walk speed to interpolated to the max sprint speed when a sprint has been initiated */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Ground|Sprint", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Sprint", meta=(ClampMin="0", UIMin="0"))
 	float WalkToSprintInterpSpeed;
 	
 	FTimerHandle TimerHandle_SprintTimer;
-	
+
 	UPROPERTY(BlueprintReadOnly)
 	bool bIsSprinting;
-
+	
 	void OnSprintTimer();
 
 	// firing
@@ -95,19 +116,31 @@ protected:
 
 	// airborne
 	/** Gravity scale when not performing any special actions */
-	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="SNG Character Movement|Air|Defaults", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="SNG Character Movement|Defaults|Air", meta=(ClampMin="0", UIMin="0"))
 	float DefaultGravityScale;
 
 	/** How much to dampen lateral velocities at the start of a jump */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Air|Defaults", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Defaults|Air", meta=(ClampMin="0", UIMin="0"))
 	float LateralVelocityDampening;
 
+	/** Gravity Scale we want character to interpolate to. Interpolated based on GravityScaleInterpSpeed. */
+	UPROPERTY(BlueprintReadWrite)
+	float TargetGravityScale;
+
+	/** How fast current GravityScale will be interpolated to TargetGravityScale */
+	UPROPERTY(BlueprintReadWrite)
+	float GravityScaleInterpSpeed;
+
+	/** Timer used to determine when to start interpolating GravityScale back to TargetGravityScale */
+	UPROPERTY(BlueprintReadWrite)
+	float FloatTime;
+	
 	/**
 	 *	How high (Z) is the character able to reach when holding the jump button for the maximum allowed time.
 	 *
 	 *	This is used in conjunction with DesiredJumpDuration to derive DefaultGravityScale and JumpZVelocity.
 	 */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Air|Jump", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Jump", meta=(ClampMin="0", UIMin="0"))
 	float MaxJumpHeight;
 
 	/**
@@ -116,22 +149,22 @@ protected:
 	 *
 	 *	This is used in conjunction with MaxJumpHeight to derive DefaultGravityScale and JumpZVelocity.
 	 */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Air|Jump", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Jump", meta=(ClampMin="0", UIMin="0"))
 	float DesiredJumpDuration;
 	
 	/** Force to continuously apply to character when they are holding the jump button */
-	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="SNG Character Movement|Air|Jump", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="SNG Character Movement|Jump", meta=(ClampMin="0", UIMin="0"))
 	float DefaultJumpZVelocity;
 	
 	/** Minimum height a character must reach before jump force is no longer applied even if the jump input is not being held */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Air|Jump", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Jump", meta=(ClampMin="0", UIMin="0"))
 	float MinJumpHeight;
 
 	/** Max time the jump button can be held to give character upward velocity */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Air|Jump", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Jump", meta=(ClampMin="0", UIMin="0"))
 	float MaxJumpTime;
 
-	void ComputerGravityScaleAndJumpZVelocity();
+	void ComputeGravityScaleAndJumpZVelocity();
 	
 	/**
 	 *	Sets up character velocities and jump parameters like the jump timer	
@@ -146,16 +179,54 @@ protected:
 	void AddJumpForce();
 
 	/** Default friction when not performing any special actions and in the air */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Air|Defaults", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Defaults|Air", meta=(ClampMin="0", UIMin="0"))
 	float DefaultAirControl;
 
 	/** Minimum distance from the ground a character has to be to be able to perform an air dash */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Air|Defaults", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Defaults|Air", meta=(ClampMin="0", UIMin="0"))
 	float MinAllowedDashHeight;
 
 	/** Minimum distance from the ground a character has to be to be able to perform an air attack */
-	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Air|Defaults", meta=(ClampMin="0", UIMin="0"))
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Defaults|Air", meta=(ClampMin="0", UIMin="0"))
 	float MinAllowedAttackHeight;
+
+	/** Initial lateral velocity when the character dashes */
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Dash", meta=(ClampMin="0", UIMin="0"))
+	float DashVelocity;
+
+	/** Initial ground friction when the character dashes */
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Dash", meta=(ClampMin="0", UIMin="0"))
+	float DashGroundFriction;
+
+	/** Initial gravity scale when the character dashes */
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Dash", meta=(ClampMin="0", UIMin="0"))
+	float DashGravityScale;
+
+	/** How long the character should "float" before the gravity scale is interpolated back to default */
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Dash", meta=(ClampMin="0", UIMin="0"))
+	float DashFloatTime;
+
+	/** How fast default gravity scale will be interpolated to after dash is done */
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Dash", meta=(ClampMin="0", UIMin="0"))
+	float DashGravityToDefaultSpeed;
+	
+	/** How long the character should "slide" before the ground friction is interpolated back to default */
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Dash", meta=(ClampMin="0", UIMin="0"))
+	float DashSlideTime;
+
+	/** How fast default ground friction will be interpolated to after dash is done */
+	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category="SNG Character Movement|Dash", meta=(ClampMin="0", UIMin="0"))
+	float DashGroundFrictionToDefaultSpeed;
+	
+	/**
+	 * @brief Interpolates current movement parameters (i.e. GravityScale, MaxWalkSpeed, GroundFrinction) to the values
+	 * specified by the parameters corresponding target value (i.e. GravityScale will be interpolated to TargetGravityScale).
+	 * The interpolation speed is determined by the parameters corresponding speed value (i.e. GravityScale is interpolated
+	 * to TargetGravityScale by a speed of GravityScaleInterpSpeed).
+	 * 
+	 * This function is called every component tick.
+	 */
+	void InterpolateMovementParameters(float DeltaTime);
 	
 	virtual void BeginPlay() override;