50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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#include "EditorDragTools.h"
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class FCanvas;
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class FEditorViewportClient;
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class FSceneView;
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/**
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* Draws a line in the current viewport and displays the distance between
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* its start/end points in the center of it.
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*/
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class FDragTool_Measure : public FDragTool
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{
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public:
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explicit FDragTool_Measure(FEditorViewportClient* InViewportClient);
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/**
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* Starts a mouse drag behavior. The start location is snapped to the editor constraints if bUseSnapping is true.
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*
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* @param InViewportClient The viewport client in which the drag event occurred.
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* @param InStart Where the mouse was when the drag started (world space).
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* @param InStartScreen Where the mouse was when the drag started (screen space).
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*/
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virtual void StartDrag(FEditorViewportClient* InViewportClient, const FVector& InStart, const FVector2D& InStartScreen) override;
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/* Updates the drag tool's end location with the specified delta. The end location is
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* snapped to the editor constraints if bUseSnapping is true.
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*
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* @param InDelta A delta of mouse movement.
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*/
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virtual void AddDelta(const FVector& InDelta) override;
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virtual void Render(const FSceneView* View,FCanvas* Canvas) override;
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private:
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/**
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* Gets the world-space snapped position of the specified pixel position
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*/
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FVector2D GetSnappedPixelPos(FVector2D PixelPos);
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/** Pixel-space positions for start and end */
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FVector2D PixelStart, PixelEnd;
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FEditorViewportClient* ViewportClient;
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};
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