def test_camera_translate_to_frame():
cam = Camera(viewport=(0, 0, 800, 600), pixel_ratio=80)
assert cam.position == Vector(0, 0)
assert cam.translate_to_frame(Vector(400, 300)) == Vector(0, 0)
assert cam.translate_to_frame(Vector(560, 220)) == Vector(2, -1)
cam.position = Vector(5, 5)
assert cam.translate_to_frame(Vector(400, 300)) == Vector(5, 5)
assert cam.translate_to_frame(Vector(560, 220)) == Vector(7, 4)
def test_camera_translate_to_viewport():
cam = Camera(viewport=(0, 0, 800, 600), pixel_ratio=80)
assert cam.position == Vector(0, 0)
assert cam.translate_to_viewport(Vector(0, 0)) == Vector(400, 300)
assert cam.translate_to_viewport(Vector(2, -1)) == Vector(560, 220)
cam.position = Vector(5, 5)
assert cam.translate_to_viewport(Vector(5, 5)) == Vector(400, 300)
assert cam.translate_to_viewport(Vector(7, 4)) == Vector(560, 220)
def test_camera_translate_to_frame():
cam = Camera(viewport=(0, 0, 800, 600), pixel_ratio=80)
assert cam.position == Vector(0, 0)
assert cam.frame_top == 3.75
assert cam.frame_bottom == -3.75
assert cam.frame_left == -5
assert cam.frame_right == 5
assert cam.translate_to_frame(Vector(400, 300)) == Vector(0, 0)
assert cam.translate_to_frame(Vector(560, 220)) == Vector(2, 1)
cam.position = Vector(5, 5)
assert cam.translate_to_frame(Vector(400, 300)) == Vector(5, 5)
assert cam.translate_to_frame(Vector(560, 220)) == Vector(7, 6)
def test_sprite_in_viewport():
cam = Camera(viewport=(0, 0, 800, 600))
class Thing(BaseSprite):
def __init__(self, position=Vector(2, 2)):
super().__init__()
self.game_unit_size = 2
self.position = position
sprite_in = Thing(Vector(-3, -1))
sprite_half_in = Thing(Vector(5, -2))
sprite_out = Thing(Vector(2, 5))
assert not cam.in_frame(sprite_out)
assert cam.in_frame(sprite_in)
assert cam.in_frame(sprite_half_in)
def test_transfromation_roundtrip(vp_width, vp_height, pixel_ratio, cam_pos,
point):
cam = Camera(
viewport=(0, 0, vp_width, vp_height),
pixel_ratio=pixel_ratio,
)
cam.position = cam_pos
note(
f"frame: ({cam.frame_left}, {cam.frame_bottom}) -> ({cam.frame_right}, {cam.frame_top})"
)
# Some underflow/loss of precision problems
assume(cam.frame_left != cam.frame_right)
assume(cam.frame_top != cam.frame_bottom)
note(f"point: {point}")
point_frame = cam.translate_to_frame(point)
note(f"point->frame: {point_frame}")
point_viewport = cam.translate_to_viewport(point_frame)
note(f"point->frame->viewport: {point_viewport}")
assert point_viewport.isclose(point, rel_tol=1e-5, rel_to=[cam.position])
point_viewport = cam.translate_to_viewport(point)
note(f"point->viewport: {point_viewport}")
point_frame = cam.translate_to_frame(point_viewport)
note(f"point->viewport->frame: {point_frame}")
assert point_frame.isclose(point, rel_tol=1e-5, rel_to=[cam.position])
def test_transfromation_movement(
vp_width,
vp_height,
pixel_ratio,
cam_pos,
point,
delta,
):
cam = Camera(
viewport=(0, 0, vp_width, vp_height),
pixel_ratio=pixel_ratio,
)
cam.position = cam_pos
assume(delta.length != 0)
point_moved = point + delta
assume(point_moved !=
point) # This will happen when delta is too small to make an effect
note(f"point moved: {point_moved}")
diff = cam.translate_to_frame(point_moved) - cam.translate_to_frame(point)
note(f"frame diff: {diff}")
assert isclose(delta.length, pixel_ratio * diff.length, rel_tol=1e-4)
diff = cam.translate_to_viewport(point_moved) - cam.translate_to_viewport(
point)
note(f"viewport diff: {diff}")
assert isclose(diff.length, pixel_ratio * delta.length, rel_tol=1e-4)
def test_main_camera(scene):
assert scene.main_camera is None
new_cam = Camera(None, 25, (800, 600))
scene.main_camera = new_cam
assert scene.main_camera == new_cam
assert new_cam in scene
def test_sprite_in_viewport():
# Added the expected pixel ratio due to change in default breaking this test.
# 80 is the legacy value.
cam = Camera(viewport=(0, 0, 800, 600), pixel_ratio=80)
class Thing(BaseSprite):
def __init__(self, position=Vector(2, 2)):
super().__init__()
self.size = 2
self.position = position
sprite_in = Thing(Vector(-3, -1))
sprite_half_in = Thing(Vector(5, -2))
sprite_out = Thing(Vector(2, 5))
assert not cam.in_frame(sprite_out)
assert cam.in_frame(sprite_in)
assert cam.in_frame(sprite_half_in)
def test_main_camera(scene):
assert isinstance(scene.main_camera, Camera)
old_cam = scene.main_camera
new_cam = Camera()
scene.main_camera = new_cam
assert scene.main_camera == new_cam
assert old_cam not in scene
assert new_cam in scene
def __init__(self, *,
set_up: Callable = None, pixel_ratio: Number = 64,
**kwargs):
super().__init__()
for k, v in kwargs.items():
setattr(self, k, v)
self.game_objects = self.container_class()
self.main_camera = Camera(pixel_ratio=pixel_ratio)
if set_up is not None:
set_up(self)
def __init__(self,
engine,
*,
background_color: Sequence[int] = (0, 0, 100),
container_class: Type = GameObjectCollection,
set_up: Callable = None,
pixel_ratio: Union[int, float] = 80,
**kwargs):
super().__init__(engine)
self.background_color = background_color
self.background = None
self.game_objects = container_class()
self.main_camera = Camera(pixel_ratio=pixel_ratio)
if set_up is not None:
set_up(self)
def test_transformation_roundtrip(vp_width, vp_height, target_width, cam_pos, point):
cam = Camera(None, target_width, (vp_width, vp_height))
cam.position = cam_pos
note(f"frame: ({cam.left}, {cam.bottom}) -> ({cam.right}, {cam.top})")
# Some underflow/loss of precision problems
assume(cam.left != cam.right)
assume(cam.top != cam.bottom)
note(f"point: {point}")
point_frame = cam.translate_point_to_screen(point)
note(f"point->frame: {point_frame}")
point_viewport = cam.translate_point_to_game_space(point_frame)
note(f"point->frame->viewport: {point_viewport}")
assert point_viewport.isclose(point, rel_tol=1e-5, rel_to=[cam.position])
point_viewport = cam.translate_point_to_game_space(point)
note(f"point->viewport: {point_viewport}")
point_frame = cam.translate_point_to_screen(point_viewport)
note(f"point->viewport->frame: {point_frame}")
assert point_frame.isclose(point, rel_tol=1e-5, rel_to=[cam.position])
def test_camera_viewport():
cam = Camera(viewport=(0, 0, 800, 600))
assert cam.point_in_viewport(Vector(400, 400))
assert not cam.point_in_viewport(Vector(900, 600))
assert cam.viewport_offset == Vector(400, 300)
def test_camera_translate_to_viewport_2():
cam = Camera(viewport=(0, 0, 800, 600), pixel_ratio=1)
assert cam.position == Vector(0, 0)
assert cam.translate_to_viewport(Vector(0, 0)) == Vector(400, 300)
assert cam.translate_to_viewport(Vector(100, 100)) == Vector(500, 200)
assert cam.translate_to_viewport(Vector(-150, -500)) == Vector(250, 800)
def test_viewport_change_affects_frame_height():
cam = Camera(viewport=(0, 0, 800, 600), pixel_ratio=80)
assert cam.frame_left == -5
cam.viewport_width = 400
assert cam.frame_left == -2.5
def test_camera_move():
cam = Camera()
cam.position = Vector(500, 500)
assert cam.position == Vector(500, 500)
cam.position += Vector(100, 100)
assert cam.position == Vector(600, 600)
def camera():
return Camera(None, 10, (800, 600))
def test_camera_point_in_viewport_not_at_origin():
cam = Camera(viewport=(100, 100, 800, 600))
assert cam.point_in_viewport(Vector(150, 650))
assert cam.point_in_viewport(Vector(899, 300))
assert not cam.point_in_viewport(Vector(50, 50))
assert not cam.point_in_viewport(Vector(901, 600))
