Review Request 127570: take advantage of "orientability" of arcs to solve a couple of longstanding problems for arcs by 3 points subject to change of concavity

[Aleix Pol Gonzalez]

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objects/other_imp.cc (line 559)
<https://git.reviewboard.kde.org/r/127570/#comment64111>

    Maybe it would be better put as:
    `const double angle = mradius < 0 ? msa+ma : msa`?


- Aleix Pol Gonzalez


On April 4, 2016, 3:35 p.m., Maurizio Paolini wrote:
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> (Updated April 4, 2016, 3:35 p.m.)
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> 
> Review request for KDE Edu and David Narváez.
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> Repository: kig
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> Description
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> ArcBTPType can change concavity upon moving the defining points.  In such a situation the construction of the firstEndPoint and secondEndPoint properties get swapped and can lead to subsequent constructions that change abruptly.
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> Similarly the getPoint and getParam methods (that transform parameter t in [0,1] to a point in the arc and viceversa) is
> not defined smoothly upon change of concavity.
> A consequence of this is e.g. the sudden change of position of labels attached to an arc when the arc changes concavity.
> 
> The first problem is addressed by a test in the firstEndPoint and secondEndPoint methods.
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> The second problem is addressed by changing t in 1-t in both getParam and getPoint methods when mradius < 0.
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> Diffs
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>   objects/other_imp.cc 7bc143e 
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> Diff: https://git.reviewboard.kde.org/r/127570/diff/
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> 
> Testing
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> The first problem can be made apparent with the following construction:
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> 1. Construct an arc by three points (say A, P, B)
> 2. Hide points A and B
> 3. Right-click on the arc and select Construct->First End Point
> 4. Move point P so that the the arc becomes a segment and then changes its concavity
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> Without the proposed patch observe the sudden jump of the newly created point
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> Similarly, the second problem becomes apparent with the further step:
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> 5. Right-click on the arc (in a position near an end-point) and select "Add Text Label->(any choice)"
> 6. Move point P as before
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> File Attachments
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> kig construction showing the problem
>   https://git.reviewboard.kde.org/media/uploaded/files/2016/04/04/0d3f9dc5-06eb-4ec1-8b54-57ffc0c97b10__arc_param.kig
> snapshot of the kig file construction
>   https://git.reviewboard.kde.org/media/uploaded/files/2016/04/04/b8532477-262c-4d0a-9c19-a1b3ce0e98a3__arc_param.png
> 
> 
> Thanks,
> 
> Maurizio Paolini
> 
>

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