def __init__(self, world, showcase, cam, pos):
self.mouseJoint = None
self.mouseWorld = Box2D.b2Vec2(0.0, 0.0)
self.mouseTracing = False
self.mouseTracingPosition = Box2D.b2Vec2(0.0, 0.0)
self.mouseTracingVelocity = Box2D.b2Vec2(0.0, 0.0)
self.cam = cam
self.world = world
self.ground = world.CreateStaticBody()
# Create Particle System
psDef = Box2D.b2ParticleSystemDef()
psDef.flags = Box2D.b2_waterParticle
self.particleSystem = world.CreateParticleSystem(psDef)
# Particle system initialization
self.particleSystem.SetRadius(DEF.PARTICLE_RADIUS) # 0.025
self.particleSystem.SetDensity(DEF.PARTICLE_DENSITY)
# ground
shape = Box2D.b2PolygonShape()
shape.vertices = [
Box2D.b2Vec2(-40, -10),
Box2D.b2Vec2(40, -10),
Box2D.b2Vec2(40, 0),
Box2D.b2Vec2(-40, 0)]
self.ground.CreatePolygonFixture(shape=shape, density=0.0)
# left wall
shape = Box2D.b2PolygonShape()
shape.vertices = [
Box2D.b2Vec2(-40, -0.1),
Box2D.b2Vec2(-20, -0.1),
Box2D.b2Vec2(-20, 20),
Box2D.b2Vec2(-40, 30)]
self.ground.CreatePolygonFixture(shape=shape, density=0.0)
# right wall
shape = Box2D.b2PolygonShape()
shape.vertices = [
Box2D.b2Vec2(20, -0.1),
Box2D.b2Vec2(40, -0.1),
Box2D.b2Vec2(40, 30),
Box2D.b2Vec2(20, 20)]
self.ground.CreatePolygonFixture(shape=shape, density=0.0)
# add to showcases
points = []
for fixture in self.ground.fixtures:
for point in fixture.shape.vertices:
points.append(point)
index = [0, 1, 3, 1, 2, 3, 4, 5, 7, 5, 6, 7, 8, 9, 11, 9, 10, 11]
self.figure = graphicsHelper.createMesh(points, index)
showcase.add(self.figure)
# particle volume
shape = Box2D.b2PolygonShape()
shape.SetAsBox(20, 10, Box2D.b2Vec2(0, 10), 0)
pd = Box2D.b2ParticleGroupDef()
pd.shape = shape
pd.color = Box2D.b2ParticleColor(255, 0, 0, 255)
group = self.particleSystem.CreateParticleGroup(pd)
# dynamic box 1
self.body1 = world.CreateDynamicBody()
shape = Box2D.b2PolygonShape()
shape.SetAsBox(2, 2, Box2D.b2Vec2(-10, 5), 0)
self.body1.CreateFixture(Box2D.b2FixtureDef(shape=shape, density=0.1))
self.particleSystem.DestroyParticlesInShape(
shape, self.body1.transform)
points = self.body1.fixtures[0].shape.vertices
index = (0, 1, 3, 1, 2, 3)
self.boxF1 = graphicsHelper.createMesh(points, index)
self.boxF1.position = (
self.body1.transform.position.x, self.body1.transform.position.y)
showcase.add(self.boxF1)
# dynamic box 2
self.body2 = world.CreateDynamicBody()
shape.SetAsBox(2, 2, Box2D.b2Vec2(10, 5), 0)
self.body2.CreateFixture(Box2D.b2FixtureDef(shape=shape, density=0.1))
self.particleSystem.DestroyParticlesInShape(
shape, self.body2.transform)
points = self.body2.fixtures[0].shape.vertices
index = (0, 1, 3, 1, 2, 3)
self.boxF2 = graphicsHelper.createMesh(points, index)
self.boxF2.position = (
self.body2.transform.position.x, self.body2.transform.position.y)
showcase.add(self.boxF2)
# important: make a step to initialize particles position
world.Step(DEF.TIME_STEP, DEF.VELOCITY_ITERATION,
DEF.POSITION_ITERATION, DEF.PARTICLE_ITERATION)
# get particle buffers
posBuff = self.particleSystem.GetPositionBuffer()
colorBuff = self.particleSystem.GetColorBuffer()
count = self.particleSystem.GetParticleCount()
radius = self.particleSystem.GetRadius()
# important: pass posBuff.this and colorBuff.this as SwigPyObject (parsable at C++)
self.particle = core.particle(
posBuff.this, colorBuff.this, count, radius)
showcase.add(self.particle)
