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Contents
# The Nature of Code
# <http:#www.shiffman.net/teaching/nature>
# Spring 2011
# PBox2D example
# Box2D particle system example
load_library :pbox2d
load_library :particle_system
# module PS is a wrapper for java imports, and Boundary and Particle classes
include PS
attr_reader :box2d, :boundaries, :systems
def setup
size(400,300)
smooth
# Initialize box2d physics and create the world
@box2d = PBox2D.new(self)
box2d.create_world
# We are setting a custom gravity
box2d.set_gravity(0, -20)
# Create ArrayLists
@systems = []
@boundaries = []
# Add a bunch of fixed boundaries
boundaries << Boundary.new(box2d, 50, 100, 300, 5, -0.3)
boundaries << Boundary.new(box2d, 250, 175, 300, 5, 0.5)
end
def draw
background(255)
# We must always step through time!
box2d.step
# Run all the particle systems
if systems.size > 0
systems.each do |system|
system.run
system.add_particles(box2d, rand(0 .. 2))
end
end
# Display all the boundaries
boundaries.each do |wall|
wall.display
end
end
def mouse_pressed
# Add a new Particle System whenever the mouse is clicked
systems << ParticleSystem.new(box2d, 0, mouse_x, mouse_y)
end
Version data entries
8 entries across 8 versions & 1 rubygems