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Contents
# The Nature of Code
# Daniel Shiffman
# http://natureofcode.com
# A fixed boundary class (now incorporates angle)
class Boundary
extend Forwardable
def_delegators(:@app, :fill, :no_fill, :stroke, :rect, :rect_mode, :box2d,
:stroke_weight, :translate, :push_matrix, :pop_matrix, :rotate)
# A boundary is a simple rectangle with x,y,width,and height
attr_reader :x, :y, :w, :h, :b
def initialize(x, y, w, h, a)
@x, @y, @w, @h, @a = x, y, w, h, a
@app = $app
# Define the polygon
sd = PolygonShape.new
# Figure out the box2d coordinates
box2dw = box2d.scale_to_world(w / 2)
box2dh = box2d.scale_to_world(h / 2)
# We're just a box
sd.setAsBox(box2dw, box2dh)
# Create the body
bd = BodyDef.new
bd.type = BodyType::STATIC
bd.angle = a
bd.position.set(box2d.processing_to_world(x, y))
@b = box2d.create_body(bd)
# Attached the shape to the body using a Fixture
b.create_fixture(sd, 1)
end
# Draw the boundary, if it were at an angle we'd have to do something fancy
def display
no_fill
stroke(127)
fill(127)
stroke_weight(1)
rect_mode(Java::ProcessingCore::PConstants::CENTER)
a = b.get_angle
push_matrix
translate(x, y)
rotate(-a)
rect(0, 0, w, h)
pop_matrix
end
end
Version data entries
7 entries across 7 versions & 1 rubygems