Add a zoom-to-mouse-position option to the 3D viewer#592
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When the "Zoom to mouse position" preference is enabled, the mouse wheel zooms toward the point under the cursor via the view's ZoomAtPoint instead of the centered SetZoom. The preference defaults to off, preserving the existing centered-zoom behavior.
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Summary
Adds a Zoom to mouse position viewer preference. When enabled, the mouse wheel zooms toward the point under the cursor instead of the view center.
wheelEventzooms via the view'sStartZoomAtPoint/ZoomAtPoint; when disabled it keeps the originalSetZoom.ZOOM_STEP, so a wheel notch moves the same amount in both modes.Changes
cq_editor/widgets/occt_widget.py—ZOOM_AT_POINT_STEPconstant,_zoom_to_cursorflag,set_zoom_to_cursor(), and thewheelEventbranch.cq_editor/widgets/viewer.py— the preference and its wiring inupdatePreferences.tests/test_app.py—test_viewer_zoom_to_mousecovering both wheel paths and the preference wiring.Testing
pytest tests/test_app.py— the new test and the existing viewer tests pass.Claude AI assisted with the implementation under my direction; design, testing, and review are mine.