bool UHUDBlueprintLibrary::IsPointOnScreenWithinDistance(UObject* WorldContextObject, const FVector& InWorldLocation, const float& InMaxDistance)
{
float MaxDistanceSquared = InMaxDistance * InMaxDistance;
UWorld* World = GEngine->GetWorldFromContextObject(WorldContextObject);
if (!World->IsValidLowLevel()) return false;
APlayerController* PlayerController = (WorldContextObject ? UGameplayStatics::GetPlayerController(WorldContextObject, 0) : NULL);
const FVector Forward = PlayerController->PlayerCameraManager->GetCameraRotation().Vector();
//const FVector Forward = PlayerCharacter->GetActorForwardVector();
const FVector CameraLocation = PlayerController->PlayerCameraManager->GetCameraLocation();
const FVector Offset = (InWorldLocation - CameraLocation).GetSafeNormal();
const FVector2D ViewportSize = FVector2D(GEngine->GameViewport->Viewport->GetSizeXY());
float DotProduct = FVector::DotProduct(Forward, Offset);
bool bLocationIsBehindCamera = (DotProduct < 0);
if (bLocationIsBehindCamera)
{
return false;
}
FVector2D *ScreenPosition = new FVector2D();
PlayerController->ProjectWorldLocationToScreen(InWorldLocation, *ScreenPosition);
// Check to see if it's on screen. If it is, ProjectWorldLocationToScreen is all we need, return it.
if (ScreenPosition->X >= 0.f && ScreenPosition->X <= ViewportSize.X
&& ScreenPosition->Y >= 0.f && ScreenPosition->Y <= ViewportSize.Y)
{
FVector Delta = InWorldLocation - CameraLocation;
float DistanceAwaySquared = Delta.SizeSquared();
if (fabsf(DistanceAwaySquared) <= MaxDistanceSquared)
{
return true;
}
}
return false;
}
void UHUDBlueprintLibrary::FindScreenLocationForWorldLocation(UObject* WorldContextObject, const FVector& InLocation, const float EdgePercent, FVector2D& OutScreenPosition, float& OutRotationAngleDegrees, bool &bIsOnScreen)
{
bIsOnScreen = false;
OutRotationAngleDegrees = 0.f;
FVector2D *ScreenPosition = new FVector2D();
UWorld* World = GEngine->GetWorldFromContextObject(WorldContextObject);
if (!World->IsValidLowLevel()) return;
if (GEngine->GameViewport == NULL) return;
if (GEngine->GameViewport->Viewport == NULL) return;
const FVector2D ViewportSize = FVector2D(GEngine->GameViewport->Viewport->GetSizeXY());
const FVector2D ViewportCenter = FVector2D(ViewportSize.X/2, ViewportSize.Y/2);
APlayerController* PlayerController = (WorldContextObject ? UGameplayStatics::GetPlayerController(WorldContextObject, 0) : NULL);
ACharacter *PlayerCharacter = static_cast<ACharacter *> (PlayerController->GetPawn());
if (!PlayerCharacter) return;
FVector Forward = PlayerCharacter->GetActorForwardVector();
FVector Offset = (InLocation - PlayerCharacter->GetActorLocation()).GetSafeNormal();
float DotProduct = FVector::DotProduct(Forward, Offset);
bool bLocationIsBehindCamera = (DotProduct < 0);
if (bLocationIsBehindCamera)
{
// For behind the camera situation, we cheat a little to put the
// marker at the bottom of the screen so that it moves smoothly
// as you turn around. Could stand some refinement, but results
// are decent enough for most purposes.
FVector DiffVector = InLocation - PlayerCharacter->GetActorLocation();
FVector Inverted = DiffVector * -1.f;
FVector NewInLocation = PlayerCharacter->GetActorLocation() * Inverted;
NewInLocation.Z -= 5000;
PlayerController->ProjectWorldLocationToScreen(NewInLocation, *ScreenPosition);
ScreenPosition->Y = (EdgePercent * ViewportCenter.X) * 2.f;
ScreenPosition->X = -ViewportCenter.X - ScreenPosition->X;
}
PlayerController->ProjectWorldLocationToScreen(InLocation, *ScreenPosition);
// Check to see if it's on screen. If it is, ProjectWorldLocationToScreen is all we need, return it.
if (ScreenPosition->X >= 0.f && ScreenPosition->X <= ViewportSize.X
&& ScreenPosition->Y >= 0.f && ScreenPosition->Y <= ViewportSize.Y)
{
OutScreenPosition = *ScreenPosition;
bIsOnScreen = true;
return;
}
*ScreenPosition -= ViewportCenter;
float AngleRadians = FMath::Atan2(ScreenPosition->Y, ScreenPosition->X);
AngleRadians -= FMath::DegreesToRadians(90.f);
OutRotationAngleDegrees = FMath::RadiansToDegrees(AngleRadians) + 180.f;
float Cos = cosf(AngleRadians);
float Sin = -sinf(AngleRadians);
ScreenPosition = new FVector2D(ViewportCenter.X + (Sin * 150.f), ViewportCenter.Y + Cos * 150.f);
float m = Cos / Sin;
FVector2D ScreenBounds = ViewportCenter * EdgePercent;
if (Cos > 0)
{
ScreenPosition = new FVector2D(ScreenBounds.Y/m, ScreenBounds.Y);
}
else
{
ScreenPosition = new FVector2D(-ScreenBounds.Y/m, -ScreenBounds.Y);
}
if (ScreenPosition->X > ScreenBounds.X)
{
ScreenPosition = new FVector2D(ScreenBounds.X, ScreenBounds.X*m);
}
else if (ScreenPosition->X < -ScreenBounds.X)
{
ScreenPosition = new FVector2D(-ScreenBounds.X, -ScreenBounds.X*m);
}
*ScreenPosition += ViewportCenter;
OutScreenPosition = *ScreenPosition;
}