def _ball(self, pos, radius, dynamic=True, density=1.0, restitution=0.16, friction=0.5):
# Add a ball without correcting any settings
# meaning, pos and vertices are in meters
# Define the body
x, y = pos
bodyDef = box2d.b2BodyDef()
bodyDef.position.Set(x, y)
bodyDef.sleepFlag = True
# bodyDef.allowSleep(True)
userData = { 'color' : self.parent.get_color() }
bodyDef.userData = userData
# Create the Body
if not dynamic:
density = 0
body = self.parent.world.CreateBody(bodyDef)
self.parent.element_count += 1
# Add a shape to the Body
circleDef = box2d.b2CircleDef()
circleDef.density = density
circleDef.radius = radius
circleDef.restitution = restitution
circleDef.friction = friction
body.CreateShape(circleDef)
body.SetMassFromShapes();
return body
def _ball(self,
pos,
radius,
dynamic=True,
density=1.0,
restitution=0.16,
friction=0.5):
# Add a ball without correcting any settings
# meaning, pos and vertices are in meters
# Define the body
x, y = pos
bodyDef = box2d.b2BodyDef()
bodyDef.position.Set(x, y)
bodyDef.sleepFlag = True
# bodyDef.allowSleep(True)
userData = {'color': self.parent.get_color()}
bodyDef.userData = userData
# Create the Body
if not dynamic:
density = 0
body = self.parent.world.CreateBody(bodyDef)
self.parent.element_count += 1
# Add a shape to the Body
circleDef = box2d.b2CircleDef()
circleDef.density = density
circleDef.radius = radius
circleDef.restitution = restitution
circleDef.friction = friction
body.CreateShape(circleDef)
body.SetMassFromShapes()
return body
def concavePoly(self,
vertices,
dynamic=True,
density=1.0,
restitution=0.16,
friction=0.5,
screenCoord=True):
# 1. Step: Reduce
# Detect if the polygon is closed or open
if vertices[0] != vertices[-1]:
is_closed = False
else:
is_closed = True
# Continue reducing the vertecs
x, y = c = tools_poly.calc_center(vertices)
vertices = tools_poly.poly_center_vertices(vertices)
# Bring coordinates into the world coordinate system (flip, camera offset, ...)
if screenCoord: x, y = self.parent.to_world(c)
else: x, y = c
# If required, translate pixel -> meters
if self.parent.input == INPUT_PIXELS:
# translate pixel -> meters
x /= self.parent.ppm
y /= self.parent.ppm
# Let's add the body
bodyDef = box2d.b2BodyDef()
bodyDef.position = (x, y)
userData = {'color': self.parent.get_color()}
bodyDef.userData = userData
# Create the Body
if not dynamic:
density = 0
body = self.parent.world.CreateBody(bodyDef)
self.parent.element_count += 1
# Create the reusable Box2D polygon and circle definitions
polyDef = box2d.b2PolygonDef()
polyDef.vertexCount = 4 # rectangle
polyDef.density = density
polyDef.restitution = restitution
polyDef.friction = friction
circleDef = box2d.b2CircleDef()
circleDef.density = density
circleDef.radius = 0.086
circleDef.restitution = restitution
circleDef.friction = friction
# Set the scale factor
factor = 8.0
v2 = box2d.b2Vec2(*vertices[0])
for v in vertices[1:]:
v1 = v2.copy()
v2 = box2d.b2Vec2(*v)
vdir = v2 - v1 # (v2x-v1x, v2y-v1y)
vdir.Normalize()
# we need a little size for the end part
vn = box2d.b2Vec2(-vdir.y * factor, vdir.x * factor)
v = [v1 + vn, v1 - vn, v2 - vn, v2 + vn]
# Create a line (rect) for each part of the polygon,
# and attach it to the body
polyDef.setVertices([vi / self.parent.ppm for vi in v])
try:
polyDef.checkValues()
except ValueError:
print "concavePoly: Created an invalid polygon!"
return None
body.CreateShape(polyDef)
# Now add a circle to the points between the rects
# to avoid sharp edges and gaps
if not is_closed and v2.tuple() == vertices[-1]:
# Don't add a circle at the end
break
circleDef.localPosition = v2 / self.parent.ppm
body.CreateShape(circleDef)
# Now, all shapes have been attached
body.SetMassFromShapes()
# Return hard and soft reduced vertices
return body
def concavePoly(self, vertices, dynamic=True, density=1.0, restitution=0.16, friction=0.5, screenCoord=True):
# 1. Step: Reduce
# Detect if the polygon is closed or open
if vertices[0] != vertices[-1]:
is_closed = False
else:
is_closed = True
# Continue reducing the vertecs
x, y = c = tools_poly.calc_center(vertices)
vertices = tools_poly.poly_center_vertices(vertices)
# Bring coordinates into the world coordinate system (flip, camera offset, ...)
if screenCoord: x, y = self.parent.to_world(c)
else: x, y = c
# If required, translate pixel -> meters
if self.parent.input == INPUT_PIXELS:
# translate pixel -> meters
x /= self.parent.ppm
y /= self.parent.ppm
# Let's add the body
bodyDef = box2d.b2BodyDef()
bodyDef.position.Set(x, y)
bodyDef.sleepFlag = True
userData = { 'color' : self.parent.get_color() }
bodyDef.userData = userData
# Create the Body
if not dynamic:
density = 0
body = self.parent.world.CreateBody(bodyDef)
self.parent.element_count += 1
# Create the reusable Box2D polygon and circle definitions
polyDef = box2d.b2PolygonDef()
polyDef.vertexCount = 4 # rectangle
polyDef.density = density
polyDef.restitution = restitution
polyDef.friction = friction
circleDef = box2d.b2CircleDef()
circleDef.density = density
circleDef.radius = 0.086
circleDef.restitution = restitution
circleDef.friction = friction
# Set the scale factor
factor = 8.0
v2 = box2d.b2Vec2().fromTuple(vertices[0])
for v in vertices[1:]:
v1 = v2.copy()
v2 = box2d.b2Vec2().fromTuple(v)
vdir = v2-v1 # (v2x-v1x, v2y-v1y)
vdir.Normalize()
# we need a little size for the end part
vn = box2d.b2Vec2(-vdir.y*factor, vdir.x*factor)
v = [ v1+vn, v1-vn, v2-vn, v2+vn ]
# Create a line (rect) for each part of the polygon,
# and attach it to the body
for i in range(len(v)):
polyDef.setVertex(i, v[i] / self.parent.ppm)
if not tools_poly.checkDef(polyDef):
print "concavePoly: Created an invalid polygon!"
return [], 0
body.CreateShape(polyDef)
# Now add a circle to the points between the rects
# to avoid sharp edges and gaps
if not is_closed and v2.tuple() == vertices[-1]:
# Don't add a circle at the end
break
circleDef.localPosition = v2 / self.parent.ppm
body.CreateShape(circleDef)
# Now, all shapes have been attached
body.SetMassFromShapes()
# Return hard and soft reduced vertices
return body