Bugfix matrix multiplication with np.dot instead of *

rocolib/library/ServoMotor.py

@@ -3,6 +3,7 @@ from rocolib.api.composables.graph.Face import Rectangle as Shape
 from rocolib.api.ports import AnchorPort
 from rocolib.utils.dimensions import getDim
 from rocolib.utils.transforms import Translate, RotateZ
+from rocolib.utils.numsym import dot
 
 
 class ServoMotor(FoldedComponent):
@@ -18,7 +19,7 @@ class ServoMotor(FoldedComponent):
     dz = getDim(s, "hornheight")
 
     self.addFace(Shape("h", 0, 0))
-    self.setInterface("horn", AnchorPort(self, self.getGraph(), "h", RotateZ(a) * Translate([0,0,dz])))
+    self.setInterface("horn", AnchorPort(self, self.getGraph(), "h", dot(RotateZ(a), Translate([0,0,dz]))))
 
 if __name__ == "__main__":
     ServoMotor.test()