def mavlink_packet(self, m):
'''handle an incoming mavlink packet'''
if not self.mpstate.map:
# don't draw if no map
return
if m.get_type() != 'GIMBAL_REPORT':
return
needed = ['ATTITUDE', 'GLOBAL_POSITION_INT']
for n in needed:
if not n in self.master.messages:
return
# clear the camera icon
self.mpstate.map.add_object(mp_slipmap.SlipClearLayer('GimbalView'))
gpi = self.master.messages['GLOBAL_POSITION_INT']
att = self.master.messages['ATTITUDE']
vehicle_dcm = Matrix3()
vehicle_dcm.from_euler(att.roll, att.pitch, att.yaw)
rotmat_copter_gimbal = Matrix3()
rotmat_copter_gimbal.from_euler312(m.joint_roll, m.joint_el, m.joint_az)
gimbal_dcm = vehicle_dcm * rotmat_copter_gimbal
lat = gpi.lat * 1.0e-7
lon = gpi.lon * 1.0e-7
alt = gpi.relative_alt * 1.0e-3
# ground plane
ground_plane = Plane()
# the position of the camera in the air, remembering its a right
# hand coordinate system, so +ve z is down
camera_point = Vector3(0, 0, -alt)
# get view point of camera when not rotated
view_point = Vector3(1, 0, 0)
# rotate view_point to form current view vector
rot_point = gimbal_dcm * view_point
# a line from the camera to the ground
line = Line(camera_point, rot_point)
# find the intersection with the ground
pt = line.plane_intersection(ground_plane, forward_only=True)
if pt is None:
# its pointing up into the sky
return None
(view_lat, view_lon) = mp_util.gps_offset(lat, lon, pt.y, pt.x)
icon = self.mpstate.map.icon('camera-small-red.png')
self.mpstate.map.add_object(mp_slipmap.SlipIcon('gimbalview',
(view_lat,view_lon),
icon, layer='GimbalView', rotation=0, follow=False))
def test_plane(self):
'''testing line/plane intersection'''
plane = Plane(Vector3(0, 0, 0), Vector3(0, 0, 1))
line = Line(Vector3(0, 0, 100), Vector3(10, 10, -90))
p = line.plane_intersection(plane)
assert p.close(Vector3(11.11, 11.11, 0.00), tol=1e-2)