def update(self):
"""Update the rotation of the label to always be pointing to the camera.
"""
context = Context.get_instance()
c_pos = context.camera.position
direction = Vec(c_pos.x, c_pos.y, c_pos.z, 1)
direction.norm()
z_axis = Vec(0, 0, 1)
# Find the angle between the camera and the health bar, then rotate it.
# NOTE: also scaling and tranlsation are applied here.
angle = math.acos(z_axis.dot(direction))
t = self.node.transform
t.identity()
t.translate(self.translation)
t.rotate(Vec(1, 0, 0), angle)
t.scale(self.scale)
def update(self, dt):
"""Updates the health bar.
:param dt: Time delta from last update.
:type dt: float
"""
context = Context.get_instance()
c_pos = context.camera.position
direction = Vec(c_pos.x, c_pos.y, c_pos.z, 1)
direction.norm()
z_axis = Vec(0, 0, 1)
# Find the angle between the camera and the health bar, then rotate it.
angle = math.acos(z_axis.dot(direction))
t = self[Renderable].transform
t.identity()
t.translate(Vec(-self.w / 2, self.y_offset, 0))
t.rotate(Vec(1, 0, 0), angle)
