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_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_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_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)