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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/127570/">https://git.reviewboard.kde.org/r/127570/</a>
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<div>Review request for KDE Edu and David Narváez.</div>
<div>By Maurizio Paolini.</div>
<p style="color: grey;"><i>Updated April 4, 2016, 1:35 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
kig
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">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.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">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.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">The first problem is addressed by a test in the firstEndPoint and secondEndPoint methods.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">The second problem is addressed by changing t in 1-t in both getParam and getPoint methods when mradius < 0.</p></pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">The first problem can be made apparent with the following construction:</p>
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<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">Construct an arc by three points (say A, P, B)</li>
<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">Hide points A and B</li>
<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">Right-click on the arc and select Construct->First End Point</li>
<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">Move point P so that the the arc becomes a segment and then changes its concavity</li>
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<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Without the proposed patch observe the sudden jump of the newly created point</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Similarly, the second problem becomes apparent with the further step:</p>
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<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">Right-click on the arc (in a position near an end-point) and select "Add Text Label->(any choice)"</li>
<li style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;">Move point P as before</li>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>objects/other_imp.cc <span style="color: grey">(7bc143e)</span></li>
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<p><a href="https://git.reviewboard.kde.org/r/127570/diff/" style="margin-left: 3em;">View Diff</a></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">File Attachments (updated)</h1>
<li><a href="https://git.reviewboard.kde.org/media/uploaded/files/2016/04/04/0d3f9dc5-06eb-4ec1-8b54-57ffc0c97b10__arc_param.kig">kig construction showing the problem</a></li>
<li><a href="https://git.reviewboard.kde.org/media/uploaded/files/2016/04/04/b8532477-262c-4d0a-9c19-a1b3ce0e98a3__arc_param.png">snapshot of the kig file construction</a></li>
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