Is it possible to draw an arc(curve) in QGIS using Python if the following parameters are known?
- start point of the arc
- end point of the arc
- arc length
- direction of the arc from start point to end point
- Radius (of the circle created from the arc)
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Perhaps this link might help: Creating ARCs in QGIS: The Python Way – Joseph Sep 8 '16 at 9:42
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1I think that, the "arc length" is not the best parameter to describe arc. You sholud consider parameters: start, end, radius and center (of the circle). It can be generate with numpy. – dmh126 Sep 8 '16 at 10:23
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@dmh126 parameters start, end and radius of the circle are known (center point of circle is unkown). If arc can be generated with those parameters? – Sjs Sep 8 '16 at 10:50
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Center can be calculeted with start, end and radius. I'll try to figure this out later and I'll post the result. – dmh126 Sep 8 '16 at 11:08
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I have derived center point of the circle (formed by the arc) and then computed the midpoint of the arc. Having traced the midpoint, I have used "QgsCircularStringV2" class which creates the arc from its start point, mid point and end point. Refer the code for arc creation here
