def create_polygon(vertices, world):
body = world.CreateBody(Box2D.b2BodyDef())
box = Box2D.b2ChainShape(vertices_loop=vertices)
fixture = Box2D.b2FixtureDef()
fixture.shape = box
fixture.density = 2
fixture.friction = .3
fixture.restitution = .5
fixture = body.CreateFixture(fixture)
return body, [fixture]
def add_fixture(b2_world_body, jsw, jsw_fixture):
"""add a fixture to a body
:param b2_world_body: a body
:type b2_world_body: b2Body
:param jsw: dictionary defining all the gropups of data
in the json file
:type jsw: dict(sting: variant)
:param jsw_fixture: a fixture
:type jsw_fixture: b2Fixture
"""
# create and fill fixture definition
fixtureDef = b2.b2FixtureDef()
# Done with issues:
### missing pybox2d "filter" b2BodyDef property
# special case for rube documentation of
# "filter-categoryBits": 1, //if not present, interpret as 1
if "filter-categoryBits" in list(jsw_fixture.keys()):
setAttr(jsw_fixture, "filter-categoryBits", fixtureDef, "categoryBits")
else:
fixtureDef.categoryBits = 1
# special case for Rube Json property
# "filter-maskBits": 1, //if not present, interpret as 65535
if "filter-maskBits" in list(jsw_fixture.keys()):
setAttr(jsw_fixture, "filter-maskBits", fixtureDef, "maskBits")
else:
fixtureDef.maskBits = 65535
setAttr(jsw_fixture, "density", fixtureDef)
setAttr(jsw_fixture, "group_index", fixtureDef, "groupIndex")
setAttr(jsw_fixture, "friction", fixtureDef)
setAttr(jsw_fixture, "sensor", fixtureDef, "isSensor")
setAttr(jsw_fixture, "restitution", fixtureDef)
# fixture has one shape that is
# polygon, circle or chain in json
# chain may be open or loop, or edge in pyBox2D
if "circle" in list(jsw_fixture.keys()): # works ok
if jsw_fixture["circle"]["center"] == 0:
center_b2Vec2 = b2.b2Vec2(0, 0)
else:
center_b2Vec2 = rubeVecToB2Vec2(jsw_fixture["circle"]["center"])
fixtureDef.shape = b2.b2CircleShape(
pos=center_b2Vec2,
radius=jsw_fixture["circle"]["radius"],
)
if "polygon" in list(jsw_fixture.keys()): # works ok
polygon_vertices = rubeVecArrToB2Vec2Arr(
jsw_fixture["polygon"]["vertices"])
fixtureDef.shape = b2.b2PolygonShape(vertices=polygon_vertices)
if "chain" in list(jsw_fixture.keys()): # works ok
chain_vertices = rubeVecArrToB2Vec2Arr(
jsw_fixture["chain"]["vertices"])
if len(chain_vertices) >= 3:
# closed-loop b2LoopShape
# Done
if "hasNextVertex" in list(jsw_fixture["chain"].keys()):
# del last vertice to prevent crash from first and last
# vertices being to close
del chain_vertices[-1]
fixtureDef.shape = b2.b2LoopShape(
vertices_loop=chain_vertices,
count=len(chain_vertices),
)
setAttr(
jsw_fixture["chain"],
"hasNextVertex",
fixtureDef.shape,
"m_hasNextVertex",
)
setB2Vec2Attr(
jsw_fixture["chain"],
"nextVertex",
fixtureDef,
"m_nextVertex",
)
setAttr(
jsw_fixture["chain"],
"hasPrevVertex",
fixtureDef.shape,
"m_hasPrevVertex",
)
setB2Vec2Attr(jsw_fixture["chain"], "prevVertex",
fixtureDef.shape, "m_prevVertex")
else: # open-ended ChainShape
# Done
fixtureDef.shape = b2.b2ChainShape(
vertices_chain=chain_vertices,
count=len(chain_vertices),
)
# json chain is b2EdgeShape
# Done
if len(chain_vertices) < 3:
fixtureDef.shape = b2.b2EdgeShape(vertices=chain_vertices, )
# create fixture
b2_world_body.CreateFixture(fixtureDef)
def add_fixture(
b2_world_body,
jsw,
jsw_fixture,
):
# create and fill fixture definition
fixtureDef = b2.b2FixtureDef()
# Done with issues:
### missing pybox2d "filter" b2BodyDef property
# special case for rube documentation of
#"filter-categoryBits": 1, //if not present, interpret as 1
if "filter-categoryBits" in jsw_fixture.keys():
setAttr(jsw_fixture, "filter-categoryBits", fixtureDef, "categoryBits")
else:
fixtureDef.categoryBits = 1
# special case for Rube Json property
#"filter-maskBits": 1, //if not present, interpret as 65535
if "filter-maskBits" in jsw_fixture.keys():
setAttr(jsw_fixture, "filter-maskBits", fixtureDef, "maskBits")
else:
fixtureDef.maskBits = 65535
setAttr(jsw_fixture, "density", fixtureDef)
setAttr(jsw_fixture, "filter-groupIndex", fixtureDef, "groupIndex")
setAttr(jsw_fixture, "friction", fixtureDef)
setAttr(jsw_fixture, "sensor", fixtureDef, "isSensor")
setAttr(jsw_fixture, "restitution", fixtureDef)
# fixture has one shape that is
# polygon, circle or chain in json
# chain may be open or loop, or edge in pyBox2D
if "circle" in jsw_fixture.keys(): # works ok
if jsw_fixture["circle"]["center"] == 0:
center_b2Vec2 = b2.b2Vec2(0, 0)
else:
center_b2Vec2 = rubeVecToB2Vec2(
jsw_fixture["circle"]["center"]
)
fixtureDef.shape = b2.b2CircleShape(
pos=center_b2Vec2,
radius=jsw_fixture["circle"]["radius"],
)
if "polygon" in jsw_fixture.keys(): # works ok
polygon_vertices = rubeVecArrToB2Vec2Arr(
jsw_fixture["polygon"]["vertices"]
)
fixtureDef.shape = b2.b2PolygonShape(vertices=polygon_vertices)
if "chain" in jsw_fixture.keys(): # works ok
chain_vertices = rubeVecArrToB2Vec2Arr(
jsw_fixture["chain"]["vertices"]
)
if len(chain_vertices) >= 3:
# closed-loop b2LoopShape
# Done
if "hasNextVertex" in jsw_fixture["chain"].keys():
# del last vertice to prevent crash from first and last
# vertices being to close
del chain_vertices[-1]
fixtureDef.shape = b2.b2LoopShape(
vertices_loop=chain_vertices,
count=len(chain_vertices),
)
setAttr(
jsw_fixture["chain"],
"hasNextVertex",
fixtureDef.shape,
"m_hasNextVertex",
)
setB2Vec2Attr(
jsw_fixture["chain"],
"nextVertex",
fixtureDef,
"m_nextVertex",
)
setAttr(
jsw_fixture["chain"],
"hasPrevVertex",
fixtureDef.shape,
"m_hasPrevVertex",
)
setB2Vec2Attr(
jsw_fixture["chain"],
"prevVertex",
fixtureDef.shape,
"m_prevVertex"
)
else: # open-ended ChainShape
# Done
fixtureDef.shape = b2.b2ChainShape(
vertices_chain=chain_vertices,
count=len(chain_vertices),
)
# json chain is b2EdgeShape
# Done
if len(chain_vertices) < 3:
fixtureDef.shape = b2.b2EdgeShape(
vertices=chain_vertices,
)
# create fixture
b2_world_body.CreateFixture(fixtureDef)
