Measurement: Radius & diameter measurement annotations lack an arrow · FreeCAD/FreeCAD#28937

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Good first issueMod: MeasurementTopic: User InterfaceType: Feature

描述

Problem description

When using Std_Measure to determine the radius or diameter of some geometry, the annotations is attached to the center of the circle, arc, or cylindrical surface. There are no arrows to show the actual measurement. When the measurement is saved, it’s impossible to determine what geometry has been measured.

The problem is the same for radius and diameter.

Workbench affected?

Core (App, Gui,...)

Steps to reproduce

Use Std_Measure on an arc, circle, or cylindrical surface and select radius or diameter.

Expected behavior

Something closer to technical drawings. Even if the label is dragged inside the circular zone, it should have a complete arrow.

Actual behavior

Development version About Info (in Safe Mode)

OS: Ubuntu 24.04.3 LTS (KDE/plasma/xcb)
Architecture: x86_64
Version: 1.2.0dev.20260324 (Git shallow) AppImage
Build date: 2026/03/24 17:14:33
Build type: Release
Branch: (HEAD detached at 1bc5980a7)
Hash: 1bc5980a7ff302a55c617181e774cd5cd2a9443a
Python 3.11.14, Qt 6.8.3, Coin 4.0.8, Vtk 9.3.1, boost 1_86, Eigen3 3.4.0, PySide 6.8.3
shiboken 6.8.3, xerces-c 3.3.0, IfcOpenShell 0.8.2, OCC 7.8.1
Locale: French/France (fr_FR)
Stylesheet/Theme/QtStyle: FreeCAD.qss/FreeCAD Light/
Navigation Style/Orbit Style/Rotation Mode: CAD/Rounded Arcball/Drag at cursor
Logical DPI/Physical DPI/Pixel Ratio: 96/117.596/1
Installed mods:
  * Cables Workbench 0.3.5
  * Fasteners Workbench 0.5.44
  * Curves workbench 0.6.71
  * Curved Shapes 1.0.14
  * SheetMetal Workbench 0.8.10
  * FusedFilamentDesign 0.26.100
  * FreeCAD-DFM-Workbench-main

Last known good version (optional)

貢獻者指南

技術棧: cpppython
領域: desktopfrontend
議題類型: feature
難度: 3
預計時間: 1-3 hours
活動狀態: fresh
清晰度: clear
前置要求: basic C++ knowledgefamiliarity with FreeCAD's measurement tool
新手友善度: 60
研究方向: The issue requests adding an arrow to radius/diameter measurement annotations in the Std Measure tool. Look at the source code for the measurement annotation, likely in files under src/Mod/Measure/ or src/Gui/ related to measurement. The annotation currently only shows a label at the center without a leader line. Investigate how other annotations (e.g., length) draw arrows and adapt that logic. The expected behavior is shown in the first screenshot. Files to examine: MeasureGui.cpp, MeasureViewProvider.cpp, or similar. Check comments in the issue for any maintainer suggestions.