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Contents
# Cubes Contained Within a Cube
# by Ira Greenberg.
#
# Collision detection against all outer cube's surfaces.
# Uses the Vec3D and Cube classes.
# fjenett, 2010-03-12: did some cleanups and rubyfication here
# Martin Prout went a bit further on 2014-03-26
load_libraries :vecmath, :cube
def setup
size 640, 360, P3D
lights
smooth 4
@cube_count = 20
@cubes = []
0.upto( @cube_count ) do |i|
cube_size = rand(5 .. 15)
c = Cube.new(cube_size)
c.position = Vec3D.new(0.0, 0.0, 0.0)
c.speed = Vec3D.new(rand(-1.0 .. 1), rand(-1.0 .. 1), rand(-1.0 .. 1))
c.rotation = Vec3D.new(rand(40 .. 100), rand(40 .. 100), rand(40 .. 100))
@cubes << c
end
@cube_colors = [
color(0), color(51), color(102), color(153), color(204), color(255)
]
@cube_colors.reverse
@stage_size = 300
@stage = Cube.new @stage_size
end
def draw
background 50
translate width/2, height/2, -130
rotate_x frame_count * 0.001
rotate_y frame_count * 0.002
rotate_z frame_count * 0.001
no_fill
stroke 255
@stage.draw
@cubes.each_with_index do |c, i|
# draw cube
push_matrix
translate c.position.x, c.position.y, c.position.z
fcpi = frame_count * PI
rotate_x fcpi / c.rotation.x
rotate_y fcpi / c.rotation.y
rotate_x fcpi / c.rotation.z
no_stroke
c.draw @cube_colors
pop_matrix
# move it
c.position += c.speed
# draw lines
if i > 0
stroke 0
c2 = @cubes[i - 1]
line c.position.x, c.position.y, c.position.z,
c2.position.x, c2.position.y, c2.position.z
end
# collision
boundary = Boundary.new(-@stage_size / 2, @stage_size / 2)
c.speed.x *= -1 unless boundary.include? c.position.x
c.speed.y *= -1 unless boundary.include? c.position.y
c.speed.z *= -1 unless boundary.include? c.position.z
end
end
Boundary = Struct.new(:lower, :upper) do
def include? x
(lower ... upper).cover? x
end
end
Version data entries
6 entries across 6 versions & 1 rubygems