def create_triangle(p1=(0, 0),
p2=(1, 0),
p3=(.5, .866),
x=0,
y=0,
m=1,
scalar=1,
bt=Body.DYNAMIC):
'''
given points (p1..p3), mass (m), x-position (x), y-position (y),
scalar <to augment default equilateral triangle>, body_type (bt),
The default values for p1,p2,p3 make an approx. equilateral triangle.
return (body, shape) tuple for a triangle
'''
vertices = (p1, p2, p3) # equilateral
vertices = tuple((v[0] * scalar, v[1] * scalar) for v in vertices)
shape = Poly(body=None, vertices=vertices) # will set body later
vertices = shape.get_vertices() # because Vec2d of vertices is needed
moment = moment_for_poly(mass=m, vertices=vertices)
body = Body(mass=m, moment=moment)
body.position = (x, y)
shape.body = body # set body here because init None above
return body, shape
def create_pentagon(p1=(0, 0),
p2=(2, 0),
p3=(3, 2),
p4=(1, 4),
p5=(-1, 2),
x=0,
y=0,
m=1,
scalar=1,
bt=Body.DYNAMIC):
'''
given points (p1..p5), mass (m), x-position (x), y-position (y),
scalar <to augment default points>, body_type (bt),
return (body, shape) tuple for a pentagon
'''
vertices = (p1, p2, p3, p4, p5)
vertices = tuple((v[0] * scalar, v[1] * scalar) for v in vertices)
shape = Poly(body=None, vertices=vertices) # will set body later
vertices = shape.get_vertices() # because Vec2d of vertices is needed
moment = moment_for_poly(mass=m, vertices=vertices)
body = Body(mass=m, moment=moment)
body.position = (x, y)
shape.body = body # set body here because init None above
return body, shape
