undo does not return a point to its original position
Bug #1541176 reported by
Chao-Kuei Hung
on 2016-02-03
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| | Dr. Geo II |
Undecided
|
Unassigned | ||
Bug Description
Open the attached file. Notice that the angle is currently 53 deg. Drag point V0 around the circle. Click the "undo" button. It returns to a different position.
DrGeo 15.12a on lubuntu 15.04
| Chao-Kuei Hung (ckhung0) wrote : | #1 |
| Chao-Kuei Hung (ckhung0) wrote : | #2 |
| hilaire (hilaire-fernandes) wrote : | #3 |
Indeed the undo/redo command is not symmetrical for point constrained on line.
The move command comes with a displacement vector attribute, the do command-action translate with vector, the undo command action translate with -vector. But for point constrained on a line it is not symmetrical.
Possible solution: define a specific move command for constrained point on line. Its attribute will be the point curvilinear abscissa.
I don't think this problem is related with the #1539835 bug.
hilaire (hilaire-fernandes)
on 2017-06-18
| Changed in drgeo: | |
| status: | New → Confirmed |
hilaire (hilaire-fernandes)
on 2019-02-18
| Changed in drgeo: | |
| milestone: | none → 19.03 |
hilaire (hilaire-fernandes)
on 2019-02-28
| Changed in drgeo: | |
| milestone: | 19.03 → wip |
hilaire (hilaire-fernandes)
18 hours ago
| Changed in drgeo: | |
| status: | Confirmed → Incomplete |
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Got the serious bug of #1539835 again!
I continued from g3.fgeo of this bug report. Line "G2"-"O", Line "O"-"V0", and point "G2" are hidden. A free point on the x-axis (actually line "Ha"-"Hb") is created. A vertical line at this point is created. The vertical line is intersected with line "directrix" to create a point. Then the file is saved as g4.fgeo, and g4.fgeo goes lunatic.