def __init__(self, body, vertices, offset):
"""body is the body to attach the poly to, verts is an array of
cpVect's defining a convex hull with a counterclockwise winding, offset
is the offset from the body's center of gravity in body local
coordinates."""
self._body = body
verts = (vec2d * len(vertices))(*vertices)
# for (i, vertex) in enumerate(vertices):
# verts[i].x = vertex.x
# verts[i].y = vertex.y
print cp.cpMomentForPoly(body.mass, len(vertices), verts, offset)
self._shape = cp.cpPolyShapeNew(body._body, len(vertices), verts, offset)
def __init__(self, body, vertices, offset):
"""body is the body to attach the poly to, verts is an array of
cpVect's defining a convex hull with a counterclockwise winding, offset
is the offset from the body's center of gravity in body local
coordinates."""
self._body = body
verts = (vec2d * len(vertices))(*vertices)
# for (i, vertex) in enumerate(vertices):
# verts[i].x = vertex.x
# verts[i].y = vertex.y
print cp.cpMomentForPoly(body.mass, len(vertices), verts, offset)
self._shape = cp.cpPolyShapeNew(body._body, len(vertices), verts,
offset)
def moment_for_poly(mass, vertices, offset):
"""Calculate the moment of inertia for a polygon"""
verts = (Vec2d * len(vertices))
verts = verts(Vec2d(0, 0))
for (i, vertex) in enumerate(vertices):
verts[i].x = vertex[0]
verts[i].y = vertex[1]
return cp.cpMomentForPoly(mass, len(verts), verts, offset)