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Contents
# Shape Transform
# by Ira Greenberg.
#
# Illustrates the geometric relationship
# between Cube, Pyramid, Cone and
# Cylinder 3D primitives.
#
# Instructions:
# Up Arrow - increases points
# Down Arrow - decreases points
# 'p' key toggles between cube/pyramid
def setup
size 640, 360, P3D
no_stroke
@angle_inc = PI/300
@pts = 4
@angle = 0
@radius = 99
@cylinder_length = 95
@is_pyramid = false
end
def draw
background 170, 95, 95
lights
fill 255, 200, 200
translate width/2, height/2
rotate_x frame_count * @angle_inc
rotate_y frame_count * @angle_inc
rotate_z frame_count * @angle_inc
vertices = []
(0...2).each { |i|
@angle = 0
vertices[i] = []
0.upto(@pts) { |j|
pvec = PVector.new 0, 0
(
pvec.x = cos(radians( @angle )) * @radius
pvec.y = sin(radians( @angle )) * @radius
) unless ( @is_pyramid && i == 1 )
pvec.z = @cylinder_length
vertices[i][j] = pvec
@angle += 360.0/@pts
}
@cylinder_length *= -1
}
begin_shape QUAD_STRIP
0.upto(@pts) { |j|
vertex vertices[0][j].x, vertices[0][j].y, vertices[0][j].z
vertex vertices[1][j].x, vertices[1][j].y, vertices[1][j].z
}
end_shape
[0,1].each { |i|
begin_shape
0.upto(@pts) { |j|
vertex vertices[i][j].x, vertices[i][j].y, vertices[i][j].z
}
end_shape CLOSE
}
end
def key_pressed
if key == CODED
@pts += 1 if keyCode == UP && @pts < 90
@pts -= 1 if keyCode == DOWN && @pts > 4
end
@is_pyramid = !@is_pyramid if key.eql? "p"
end
Version data entries
5 entries across 5 versions & 1 rubygems