0001453: Use string representation for PropertyPlacement editor that presevers double precision - FreeCAD Tracker

NOTICE: Migration to GitHub Issues

On Feb 7, 2022, the FreeCAD project migrated all issues from this site at tracker.freecad.org to our main GitHub repository. All new bugs must be submitted there.
This Mantis repository is in read-only mode and will be retained for reference as long as it is useful.

For details please see the announcement at the Forums: https://forum.freecadweb.org/viewtopic.php?p=555883#p555883

ID	Project	Category	View Status	Date Submitted	Last Update

0001453	FreeCAD	Feature	public	2014-02-28 12:17	2019-07-29 15:17

Reporter	shoogen	Assigned To	wmayer
Priority	low	Severity	minor	Reproducibility	N/A
Status	closed	Resolution	fixed
Product Version	trunk

Summary	0001453: Use string representation for PropertyPlacement editor that presevers double precision
Description	Currently editing the Placement Property in the GUI (either from the property view or form the placement dialog) degradges the precision. This happens due to the serialisation to a string with is then provided to the runCommand function (and thus to a recorded macro). Furthermore the description of a rotation in not intuitive an unexperienced user. For simple rotations, a description using Eulerian angles could represent the exact rotation with a few decimal places. Another viable description could be an Axis with an Angle. In this representation the python command would include calls to convert the angle to radians and normalize the axis vector.
Steps To Reproduce	change the placement of an object to 30° around +z. the python window will show App.Rotation(0,0,0.258819,0.965926) obviously this value was rounded/truncated to 6 decimal digits, which roughly resembles single float precision. The value of the resulting rotation will differ because the normalization of the quaternion is performed with double precision. One example of the amount of error introduced: >>> ((1.0-App.Rotation(0,0,0.258819,0.965926).toEuler()[0]/30)).hex() '0x1.6b13c52200000p-22'
Additional Information	QString::arg(d,0,'g',6)
Tags	No tags attached.

FreeCAD Information

FreeCAD: master de727642 2014-03-01 11:41:42 wmayer Details Diff	0001453: Use string representation for PropertyPlacement editor that presevers double precision		Affected Issues 0001453
	mod - src/Gui/Placement.cpp		Diff File
	mod - src/Gui/Placement.h		Diff File
FreeCAD: master 7ebfa363 2014-03-01 12:41:29 wmayer Details Diff	+ fixes 0001453: Use string representation for PropertyPlacement editor that presevers double precision		Affected Issues 0001453
	mod - src/Gui/propertyeditor/PropertyItem.cpp		Diff File
	mod - src/Gui/propertyeditor/PropertyItem.h		Diff File

Date Modified	Username	Field	Change
2014-02-28 12:17	shoogen	New Issue
2014-02-28 12:20	shoogen	Steps to Reproduce Updated
2014-03-01 10:42	wmayer	Note Added: 0004336
2014-03-01 12:09	wmayer	Changeset attached	=> FreeCAD Master master 7ebfa363
2014-03-01 12:09	wmayer	Assigned To	=> wmayer
2014-03-01 12:09	wmayer	Status	new => closed
2014-03-01 12:09	wmayer	Resolution	open => fixed
2015-01-30 12:29	shoogen	Relationship added	child of 0000458
2019-07-29 15:17	Kunda1	Changeset attached	=> FreeCAD master de727642