def map_dragged(self, start, end):
th, u = self._projection.get_xy_rotation(start[0], start[1],
end[0], end[1])
x, y, z = [c * sin(th/2) for c in u]
rot = quat(cos(th/2), x, y, z) * self._rotation
if not any((isnan(c) for c in rot.q)):
self._rotation = rot
self.view_map_size_changed(self._view.map_size)
def __init__(self, model, view):
projections = [SineProjection, FlatProjection]
self._model = model
self._view = view
self._view.set_projection_options(projections,
self._set_projection)
self._rotation = quat(1)
self._view.map_size_changed = self.view_map_size_changed
self._view.map_dragged = self.map_dragged
self._set_projection(projections[0])
def _rotate(self, v):
q = quat(0,v[0],v[1],v[2])
return ((self._rotation*q)/self._rotation).q[1:4]