# ----------------------------------------------------------------------------
# pymunk
# Copyright (c) 2007-2023 Victor Blomqvist
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# ----------------------------------------------------------------------------
"""
Pymunk is a easy-to-use pythonic 2d physics library that can be used whenever
you need 2d rigid body physics from Python.
Homepage: http://www.pymunk.org
This is the main containing module of Pymunk. It contains among other things
the very central Space, Body and Shape classes.
"""
__docformat__ = "reStructuredText"
__all__ = [
"version",
"chipmunk_version",
"Space",
"Body",
"Shape",
"Circle",
"Poly",
"Segment",
"moment_for_circle",
"moment_for_poly",
"moment_for_segment",
"moment_for_box",
"SegmentQueryInfo",
"ContactPoint",
"ContactPointSet",
"Arbiter",
"CollisionHandler",
"BB",
"ShapeFilter",
"Transform",
"PointQueryInfo",
"ShapeQueryInfo",
"SpaceDebugDrawOptions",
"Vec2d",
]
from typing import Sequence, Tuple, cast
from . import _chipmunk_cffi
cp = _chipmunk_cffi.lib
ffi = _chipmunk_cffi.ffi
import logging
logging.getLogger(__name__).addHandler(logging.NullHandler())
# logging.basicConfig(level=0)
from . import _version
from .arbiter import Arbiter
from .bb import BB
from .body import Body
from .collision_handler import CollisionHandler
from .constraints import *
from .contact_point_set import ContactPoint, ContactPointSet
from .query_info import PointQueryInfo, SegmentQueryInfo, ShapeQueryInfo
from .shape_filter import ShapeFilter
from .shapes import Circle, Poly, Segment, Shape
from .space import Space
from .space_debug_draw_options import SpaceDebugDrawOptions
from .transform import Transform
from .vec2d import Vec2d
version: str = _version.version
"""The release version of this pymunk installation.
Valid only if pymunk was installed from a source or binary
distribution (i.e. not in a checked-out copy from git).
"""
chipmunk_version: str = _version.chipmunk_version
"""The Chipmunk version used with this Pymunk version.
This property does not show a valid value in the compiled documentation, only
when you actually import pymunk and do pymunk.chipmunk_version
The string is in the following format:
<cpVersionString>R<github commit of chipmunk>
where cpVersionString is a version string set by Chipmunk and the git commit
hash corresponds to the git hash of the chipmunk source from
github.com/viblo/Chipmunk2D included with Pymunk.
"""
[文档]
def moment_for_circle(
mass: float,
inner_radius: float,
outer_radius: float,
offset: Tuple[float, float] = (0, 0),
) -> float:
"""Calculate the moment of inertia for a hollow circle
(A solid circle has an inner radius of 0)
"""
assert len(offset) == 2
return cp.cpMomentForCircle(mass, inner_radius, outer_radius, offset)
[文档]
def moment_for_segment(
mass: float, a: Tuple[float, float], b: Tuple[float, float], radius: float
) -> float:
"""Calculate the moment of inertia for a line segment
The endpoints a and b are relative to the body
"""
assert len(a) == 2
assert len(b) == 2
return cp.cpMomentForSegment(mass, a, b, radius)
[文档]
def moment_for_box(mass: float, size: Tuple[float, float]) -> float:
"""Calculate the moment of inertia for a solid box centered on the body.
size should be a tuple of (width, height)
"""
assert len(size) == 2
return cp.cpMomentForBox(mass, size[0], size[1])
[文档]
def moment_for_poly(
mass: float,
vertices: Sequence[Tuple[float, float]],
offset: Tuple[float, float] = (0, 0),
radius: float = 0,
) -> float:
"""Calculate the moment of inertia for a solid polygon shape.
Assumes the polygon center of gravity is at its centroid. The offset is
added to each vertex.
"""
assert len(offset) == 2
vs = list(vertices)
return cp.cpMomentForPoly(mass, len(vs), vs, offset, radius)
def area_for_circle(inner_radius: float, outer_radius: float) -> float:
"""Area of a hollow circle."""
return cast(float, cp.cpAreaForCircle(inner_radius, outer_radius))
def area_for_segment(
a: Tuple[float, float], b: Tuple[float, float], radius: float
) -> float:
"""Area of a beveled segment.
(Will always be zero if radius is zero)
"""
assert len(a) == 2
assert len(b) == 2
return cp.cpAreaForSegment(a, b, radius)
def area_for_poly(vertices: Sequence[Tuple[float, float]], radius: float = 0) -> float:
"""Signed area of a polygon shape.
Returns a negative number for polygons with a clockwise winding.
"""
vs = list(vertices)
return cp.cpAreaForPoly(len(vs), vs, radius)
# del cp, ct, u
