Hi all,
I am trying to get a C++ function to show up in the Blueprint editor. I create a new C++ class > Copy the code into the .h and .cpp files and change the names to be the name of my game > Build the solution > Open the editor and the function is not there. I tried these exact steps on another project and it worked. So is there something I could have accidental changed that is making this not work for one of my projects? My Engine version is 4.9.2 and I am using Perforce Source Control. Below is the code I am using.
.h
// Fill out your copyright notice in the Description page of Project Settings.
#pragma once
#include "Kismet/BlueprintFunctionLibrary.h"
#include "HUDBlueprintLibrary.generated.h"
/**
*
*/
UCLASS()
class MOSEXAMPLE_API UHUDBlueprintLibrary : public UBlueprintFunctionLibrary
{
GENERATED_BODY()
public:
/**
* Converts a world location to screen position for HUD drawing. This differs from the results of FSceneView::WorldToScreen in that it returns a position along the edge of the screen for offscreen locations
*
* @param InLocation - The world space location to be converted to screen space
* @param EdgePercent - How close to the edge of the screen, 1.0 = at edge, 0.0 = at center of screen. .9 or .95 is usually desirable
* @outparam OutScreenPosition - the screen coordinates for HUD drawing
* @outparam OutRotationAngleDegrees - The angle to rotate a hud element if you want it pointing toward the offscreen indicator, 0° if onscreen
* @outparam bIsOnScreen - True if the specified location is in the camera view (may be obstructed)
*/
UFUNCTION(BlueprintPure, meta = (WorldContext = "WorldContextObject", CallableWithoutWorldContext), Category = "HUD|Util")
static void FindScreenEdgeLocationForWorldLocation(UObject* WorldContextObject, const FVector& InLocation, const float EdgePercent, FVector2D& OutScreenPosition, float& OutRotationAngleDegrees, bool &bIsOnScreen);
};
.cpp
// Fill out your copyright notice in the Description page of Project Settings.
#include "MOSExample.h"
#include "HUDBlueprintLibrary.h"
void UHUDBlueprintLibrary::FindScreenEdgeLocationForWorldLocation(UObject* WorldContextObject, const FVector& InLocation, const float EdgePercent, FVector2D& OutScreenPosition, float& OutRotationAngleDegrees, bool &bIsOnScreen)
{
bIsOnScreen = false;
OutRotationAngleDegrees = 0.f;
if (!GEngine) return;
const FVector2D ViewportSize = FVector2D(GEngine->GameViewport->Viewport->GetSizeXY());
const FVector2D ViewportCenter = FVector2D(ViewportSize.X / 2, ViewportSize.Y / 2);
UWorld* World = GEngine->GetWorldFromContextObject(WorldContextObject);
if (!World) return;
APlayerController* PlayerController = (WorldContextObject ? UGameplayStatics::GetPlayerController(WorldContextObject, 0) : NULL);
if (!PlayerController) return;
ACharacter* PlayerCharacter = 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, OutScreenPosition);
OutScreenPosition.Y = (EdgePercent * ViewportCenter.X) * 2.f;
OutScreenPosition.X = -ViewportCenter.X - OutScreenPosition.X;
}
PlayerController->ProjectWorldLocationToScreen(InLocation, OutScreenPosition);//*ScreenPosition);
// Check to see if it's on screen. If it is, ProjectWorldLocationToScreen is all we need, return it.
if (OutScreenPosition.X >= 0.f && OutScreenPosition.X <= ViewportSize.X
&& OutScreenPosition.Y >= 0.f && OutScreenPosition.Y <= ViewportSize.Y)
{
bIsOnScreen = true;
return;
}
OutScreenPosition -= ViewportCenter;
float AngleRadians = FMath::Atan2(OutScreenPosition.Y, OutScreenPosition.X);
AngleRadians -= FMath::DegreesToRadians(90.f);
OutRotationAngleDegrees = FMath::RadiansToDegrees(AngleRadians) + 180.f;
float Cos = cosf(AngleRadians);
float Sin = -sinf(AngleRadians);
OutScreenPosition = FVector2D(ViewportCenter.X + (Sin * 180.f), ViewportCenter.Y + Cos * 180.f);
float m = Cos / Sin;
FVector2D ScreenBounds = ViewportCenter * EdgePercent;
if (Cos > 0)
{
OutScreenPosition = FVector2D(ScreenBounds.Y / m, ScreenBounds.Y);
}
else
{
OutScreenPosition = FVector2D(-ScreenBounds.Y / m, -ScreenBounds.Y);
}
if (OutScreenPosition.X > ScreenBounds.X)
{
OutScreenPosition = FVector2D(ScreenBounds.X, ScreenBounds.X*m);
}
else if (OutScreenPosition.X < -ScreenBounds.X)
{
OutScreenPosition = FVector2D(-ScreenBounds.X, -ScreenBounds.X*m);
}
OutScreenPosition += ViewportCenter;
}
This code is from the kind people jeff_lamarche and ZioYuri78 over at this forum post https://forums.unrealengine.com/showthread.php?59398-Easy-Offscreen-Indicator-Blueprint-Node
