I do not know how to rotate a geometry using pyqgis.
Is there any sample/example code available to show me how?
- gis.stackexchange.com/questions/23587/…klewis– klewis2014-09-10 22:26:10 +00:00Commented Sep 10, 2014 at 22:26
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2 Answers
While not in Python, you can review the C++ code used by the Rotate Feature map tool.
Note:
The tool is interactive, so it uses the user input press and move events (e.g. like with a mouse) to calculate the degree of rotation to be applied.
The QgsMapToolRotateFeature::canvasReleaseEvent, where the calculated rotation is applied to the feature, is probably the code you are looking for.
- QgsMapToolRotateFeature option is seems to be semi-automatic[Using mouse events]. But I want to a rotate feature automatically to a specific angle.Dharmarajan– Dharmarajan2014-09-18 04:42:04 +00:00Commented Sep 18, 2014 at 4:42
- Look at the code in the
canvasReleaseEventfunction. L203-210 define the affine transformation, L224-243 apply the transformation to each point in the geometry. This is what you'd need. Or, as you say, you can do it using Shapely.Snorfalorpagus– Snorfalorpagus2015-03-19 10:16:59 +00:00Commented Mar 19, 2015 at 10:16
It can be accomplish, by using a python package named shapely.
Eg: shapely.affinity.rotate(ring,degres,origin='centroid',use_radians=False)