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Contents
# The Nature of Code
# <http:#www.shiffman.net/teaching/nature>
# Spring 2010
# PBox2D example
# An uneven surface
load_library :jbox2d
load_library :surface
include SB
attr_reader :surface, :box2d, :particles
def setup
size(500,300)
smooth
# Initialize box2d physics and create the world
@box2d = Processing::Box2d::Box2d.new(self)
box2d.create_world
# We are setting a custom gravity
box2d.set_gravity(0, -20)
# Create the empty list
@particles = []
# Create the surface
@surface = Surface.new(box2d)
end
def draw
# If the mouse is pressed, we make new particles
# We must always step through time!
box2d.step
background(138, 66, 54)
# Draw the surface
surface.display
# NB question mark is reqd to call mouse_pressed value, else method gets called.
particles << Particle.new(box2d, mouse_x, mouse_y, rand(2.0 .. 6)) if mouse_pressed?
# Draw all particles
particles.each do |p|
p.display
end
# Particles that leave the screen, we delete them
# (note they have to be deleted from both the box2d world and our list
particles.each_with_index do |p, i|
if (p.done)
particles.delete_at(i)
end
end
# Just drawing the framerate to see how many particles it can handle
fill(0)
text("framerate: #{frame_rate.to_i}", 12, 16)
end
Version data entries
5 entries across 5 versions & 1 rubygems