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‎.gitattributes‎

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# Auto detect text files and perform LF normalization
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* text=auto

‎.gitignore‎

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# Visual Studio 2015 user specific files
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.vs/
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# Compiled Object files
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*.slo
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*.lo
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*.o
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*.obj
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# Precompiled Headers
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*.gch
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*.pch
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# Compiled Dynamic libraries
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*.so
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*.dylib
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*.dll
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# Fortran module files
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*.mod
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# Compiled Static libraries
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*.lai
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*.la
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*.a
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*.lib
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# Executables
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*.exe
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*.out
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*.app
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*.ipa
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# These project files can be generated by the engine
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*.xcodeproj
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*.xcworkspace
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*.sln
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*.suo
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*.opensdf
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*.sdf
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*.VC.db
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*.VC.opendb
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# Precompiled Assets
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SourceArt/**/*.png
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SourceArt/**/*.tga
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# Binary Files
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Binaries/*
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Plugins/**/Binaries/*
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# Builds
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Build/*
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# Whitelist PakBlacklist-<BuildConfiguration>.txt files
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!Build/*/
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Build/*/**
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!Build/*/PakBlacklist*.txt
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# Don't ignore icon files in Build
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!Build/**/*.ico
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# Built data for maps
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*_BuiltData.uasset
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# Configuration files generated by the Editor
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Saved/*
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# Compiled source files for the engine to use
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Intermediate/*
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Plugins/**/Intermediate/*
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# Cache files for the editor to use
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DerivedDataCache/*

‎LICENSE‎

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MIT License
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Copyright (c) 2025 Cutter-H
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎ReplicatedDrawingWidgetPlugin.uplugin‎

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{
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"FileVersion": 3,
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"Version": 1,
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"VersionName": "1.0",
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"FriendlyName": "ReplicatedDrawingWidgetPlugin",
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"Description": "A widget that replicates a user's drawing for all other users.",
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"Category": "Other",
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"CreatedBy": "Cutter H",
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"CreatedByURL": "",
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"DocsURL": "",
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"MarketplaceURL": "",
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"SupportURL": "",
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"CanContainContent": true,
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"IsBetaVersion": false,
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"IsExperimentalVersion": false,
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"Installed": false,
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"Modules": [
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{
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"Name": "ReplicatedDrawingWidgetPlugin",
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"Type": "Runtime",
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"LoadingPhase": "Default"
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}
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]
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}

‎Resources/Icon128.png‎

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‎Source/ReplicatedDrawingWidgetPlugin/Private/Canvas/ReplicatedCanvasWidgetBase.cpp‎

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// Fill out your copyright notice in the Description page of Project Settings.
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#include "ReplicatedCanvasWidgetBase.h"
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#include "EngineUtils.h"
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#include "Blueprint/WidgetBlueprintLibrary.h"
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#include "Blueprint/WidgetTree.h"
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#include "CanvasHelpers/CanvasPlayerStateHelper.h"
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#include "CanvasHelpers/ReplicatedCanvasManager.h"
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#include "CanvasHelpers/WorldCanvasSubsystem.h"
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#include "Components/Border.h"
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#include "Components/Overlay.h"
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#include "Components/OverlaySlot.h"
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#include "GameFramework/PlayerState.h"
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#include "Kismet/GameplayStatics.h"
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void UReplicatedCanvasWidgetBase::DrawLines(FPaintContext& context) const{
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for (const FCanvasLineData& line : LineData) {
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if(ShouldDrawLine(line)) {
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FLinearColor color(line.Tint);
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color *= Tint;
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const float lineLife = line.GetLineLife(GetWorld());
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if (FadeDuration > 0 && EraseTime > 0 && lineLife > (EraseTime - FadeDuration)) {
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const float fadeOpacity = (EraseTime - lineLife) / FadeDuration;
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color.A *= FMath::Clamp(fadeOpacity, 0.f, 1.f);
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}
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UWidgetBlueprintLibrary::DrawSpline(context, line.StartingPoint, line.StartingDirection, line.StoppingPoint, line.StoppingDirection, color, line.Size);
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}
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}
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}
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void UReplicatedCanvasWidgetBase::CleanupLines(){
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if (EraseTime <= 0) {
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return;
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}
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while (LineData.Num() > 0 && LineData[0].GetLineLife(GetWorld()) > EraseTime) {
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LineData.RemoveAt(0);
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}
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}
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// UReplicatedCanvasWidgetBase::UReplicatedCanvasWidgetBase(const FObjectInitializer& ObjectInitializer) : Super(ObjectInitializer) {
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//
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// }
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void UReplicatedCanvasWidgetBase::TrySetupReplicator() {
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if (Replicator) { return; }
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if (const auto subsys = GetWorld()->GetSubsystem<UWorldCanvasSubsystem>()) {
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Replicator = subsys->Replicator;
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if (Replicator) {
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Replicator->OnLineAdded.AddDynamic(this, &UReplicatedCanvasWidgetBase::OnLineAddedToBoard);
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}
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}
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}
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void UReplicatedCanvasWidgetBase::NativeConstruct() {
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Super::NativeConstruct();
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if (!WidgetTree) { return; }
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UOverlay* root = WidgetTree->ConstructWidget<UOverlay>(UOverlay::StaticClass(), TEXT("OverlayRoot"));
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WidgetTree->RootWidget = root;
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DrawingPad = WidgetTree->ConstructWidget<UBorder>(UBorder::StaticClass(), TEXT("DrawingPad"));
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DrawingPad->SetVisibility(ESlateVisibility::Visible);
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DrawingPad->SetBrushColor(FLinearColor(0, 0, 0, 0));
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if (UOverlaySlot* slot = root->AddChildToOverlay(DrawingPad)) {
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slot->SetHorizontalAlignment(HAlign_Fill);
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slot->SetHorizontalAlignment(HAlign_Fill);
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}
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SetVisibility(ESlateVisibility::Visible);
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SetIsEnabled(true);
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SetIsFocusable(true);
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}
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void UReplicatedCanvasWidgetBase::NativeTick(const FGeometry& MyGeometry, float InDeltaTime) {
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Super::NativeTick(MyGeometry, InDeltaTime);
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TrySetupReplicator();
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CleanupLines();
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}
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int32 UReplicatedCanvasWidgetBase::NativePaint(const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyCullingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId,
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const FWidgetStyle& InWidgetStyle, bool bParentEnabled) const {
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FPaintContext context(AllottedGeometry, MyCullingRect, OutDrawElements, LayerId, InWidgetStyle, bParentEnabled);
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DrawLines(context);
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if (ShouldDraw()) {
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}
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return Super::NativePaint(Args, AllottedGeometry, MyCullingRect, OutDrawElements, LayerId, InWidgetStyle, bParentEnabled);
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}
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#pragma region Mouse Overrides
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FReply UReplicatedCanvasWidgetBase::NativeOnMouseButtonDown(const FGeometry& InGeometry, const FPointerEvent& InMouseEvent) {
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if (InMouseEvent.GetEffectingButton() == FKey("LeftMouseButton")) {
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bWantsToDraw = true;
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}
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return Super::NativeOnMouseButtonDown(InGeometry, InMouseEvent);
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}
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FReply UReplicatedCanvasWidgetBase::NativeOnMouseMove(const FGeometry& InGeometry, const FPointerEvent& InMouseEvent) {
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if (ShouldDraw()) {
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FVector2D currentPosition = InGeometry.AbsoluteToLocal( InMouseEvent.GetScreenSpacePosition());
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FVector2D currentDirection = FVector2D::ZeroVector;
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if (InMouseEvent.IsPointerEvent()) {
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currentDirection = InMouseEvent.GetCursorDelta();
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}
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if (InMouseEvent.IsTouchEvent()) {
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currentDirection = InMouseEvent.GetGestureDelta();
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}
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if (bStartedDrawing) {
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const FCanvasLineData line(GetDrawerName(), UGameplayStatics::GetTimeSeconds(GetWorld()), LastPosition, LastDirection, currentPosition, currentDirection, PenData.Size, PenData.Tint);
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LineData.Add(line);
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AddLineToState(line);
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}
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else {
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bStartedDrawing = true;
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}
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LastPosition = currentPosition;
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LastDirection = currentDirection;
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}
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return Super::NativeOnMouseMove(InGeometry, InMouseEvent);
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}
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FReply UReplicatedCanvasWidgetBase::NativeOnMouseButtonUp(const FGeometry& InGeometry, const FPointerEvent& InMouseEvent) {
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bWantsToDraw = false;
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bStartedDrawing = false;
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return Super::NativeOnMouseButtonUp(InGeometry, InMouseEvent);
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}
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void UReplicatedCanvasWidgetBase::NativeOnMouseLeave(const FPointerEvent& InMouseEvent) {
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Super::NativeOnMouseLeave(InMouseEvent);
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bWantsToDraw = false;
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bStartedDrawing = false;
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}
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#pragma endregion Mouse Overrides
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void UReplicatedCanvasWidgetBase::OnLineAddedToBoard(FName board, const FCanvasLineData& line) {
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UKismetSystemLibrary::PrintString(this, "Func Hit");
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if (board != BoardName) {
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return;
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}
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if (true){//line.DrawingPlayer != GetDrawerName()) {
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LineData.Add(line);
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UKismetSystemLibrary::PrintString(this, "Line Added");
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}
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}
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void UReplicatedCanvasWidgetBase::RefreshFromReplicator() {
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LineData.Empty();
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if (Replicator) {
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LineData = Replicator->GetCanvasLines(BoardName);
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}
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}
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void UReplicatedCanvasWidgetBase::CleanBoard() {
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LineData.Empty();
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if (Replicator) {
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Replicator->CleanBoard(BoardName);
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}
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}
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void UReplicatedCanvasWidgetBase::AddLineToState(const FCanvasLineData& line) {
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if (!StateHelper) {
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if (APlayerState* state = GetOwningPlayerState()) {
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StateHelper = Cast<UCanvasPlayerStateHelper>(state->GetComponentByClass(UCanvasPlayerStateHelper::StaticClass()));
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}
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}
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if (StateHelper) {
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StateHelper->AddLine(BoardName, line);
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}
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}
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FName UReplicatedCanvasWidgetBase::GetDrawerName_Implementation() {
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if (DrawerName == FName()) {
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DrawerName = FName(GetOwningPlayerState(true)->GetPlayerName());
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}
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return DrawerName;
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}
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bool UReplicatedCanvasWidgetBase::ShouldDraw_Implementation() const {
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if (!bWantsToDraw || !(PenData.Size > 0) || !(PenData.Tint.A > 0)) {
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return false;
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}
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return true;
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}

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