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Contents
# The Nature of Code
# <http://www.shiffman.net/teaching/nature>
# Spring 2011
# PBox2D example
# Basic example of falling rectangles
load_library :pbox2d
load_library :custom_shape
# module B2D is a wrapper for java imports, and Boundary and CustomShape classes
include B2D
attr_reader :box2d, :boundaries, :polygons
def setup
size(640,360)
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 Arrays
@polygons = []
@boundaries = []
# Add a bunch of fixed boundaries
boundaries << Boundary.new(box2d, width / 4, height - 5, width/2 - 50, 10, 0)
boundaries << Boundary.new(box2d, 3*width / 4, height - 50, width/2 - 50, 10, 0)
boundaries << Boundary.new(box2d, width - 5,height / 2, 10, height, 0)
boundaries << Boundary.new(box2d, 5, height / 2, 10, height, 0)
end
def draw
background(255)
# We must always step through time!
box2d.step
# Display all the boundaries
boundaries.each do |wall|
wall.display
end
# Display all the polygons
polygons.each do |cs|
cs.display
end
# polygons that leave the screen, we delete them
# (note they have to be deleted from both the box2d world and our list
polygons.each_with_index do |polygon, i|
if polygon.done
polygons.delete_at(i)
end
end
end
def mouse_pressed
polygons << CustomShape.new(box2d, mouse_x, mouse_y)
end
Version data entries
9 entries across 9 versions & 1 rubygems