how to rotate a symbol

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I am working in c++/python/QT 4.5 with the api qgis 2.8.2

My application receive data from a communication port that indicate the change of position of an object diplayed on the map and represented by a svg ( an arrow )the data received contains new position x and y and the rotation in degree

I want to rotate the symbol with the value received, if value equal 0 there is no rotation, if the value is 30 then rotate the symbol of 30 deg clockwise

I don't know how to do that, may be some of you had already work on that kind of point and share their procedure



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