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Gosu + Chipmunk
require 'gosu'
require 'rmagick'
require 'chipmunk'
Width, Height = 600, 600
Wall_h = 20
class MyWindow < Gosu::Window
def initialize
super Width, Height, false
self.caption = "Gosu + Chipmunk"
@space = CP::Space.new
@space.gravity = CP::Vec2.new(0, 250)
circle_image = Magick::Image.new(21, 21) {self.background_color = 'transparent'}
gc = Magick::Draw.new
gc.fill('yellow')
gc.circle(10, 10, 0, 10)
gc.draw(circle_image)
@circle = Gosu::Image.new(circle_image)
background = Magick::Image.new(Width, Height) {self.background_color = "black"}
create_wall(0, Height - Wall_h, Width, Height - Wall_h, Wall_h, background)
create_wall(Wall_h, 0, Wall_h, Height, Wall_h, background)
create_wall(Width, 0, Width, Height, Wall_h, background)
create_wall(120, 150, 400, 200, Wall_h, background)
create_wall(200, 450, 480, 400, Wall_h, background)
@background_image = Gosu::Image.new(background)
@circles = []
end
def create_circle
body = CP::Body.new(1, CP::INFINITY)
body.p = CP::Vec2.new(rand(Width / 2 + Width / 4), -20)
body.v = CP::Vec2.new(rand * 500 - 250, 0)
shape = CP::Shape::Circle.new(body, 10, CP::Vec2.new(0, 0))
shape.e = 0.8
shape.u = 0
@space.add_body(body)
@space.add_shape(shape)
body
end
def create_wall(x1, y1, x2, y2, height, bg)
sb = CP::Body.new_static
p1 = CP::Vec2.new(x1, y1)
p4 = CP::Vec2.new(x2, y2)
p0 = p4 - p1
p2 = p1 + p0.normalize.rotate(CP::Vec2.new(0, 1)) * height
p3 = p2 + p0
verts = [p1, p2, p3, p4]
wshape = CP::Shape::Poly.new(sb, verts, CP::Vec2.new(0, 0))
wshape.e = 1
wshape.u = 0
@space.add_shape(wshape)
gc = Magick::Draw.new
gc.fill('firebrick')
verts = verts.map {|vt| [vt.x, vt.y]}.flatten
gc.polygon(*verts)
gc.draw(bg)
end
def update
@space.step(1.0 / 60)
@circles << create_circle if rand < 0.1 and @circles.size < 300
end
def draw
@background_image.draw(0, 0, 0)
@circles.each {|c| @circle.draw_rot(c.p.x, c.p.y, 1, 0)}
end
end
MyWindow.new.show
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