Sha256: 3ae79a82ecc19d91dc3b7f92317b2a6940d8bb8fd159cd7170303cdc3a90f4b8
Contents?: true
Size: 919 Bytes
Versions: 7
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Stored size: 919 Bytes
Contents
# TRIANGLE_STRIP Mode
# by Ira Greenberg.
#
# Generate a closed ring using vertex()
# function and begin_shape(TRIANGLE_STRIP) mode
# using outer_radius and inner_radius variables to
# control ring's outer/inner radii respectively.
# Trig functions generate ring.
attr_reader :x, :y, :outer_radius, :inner_radius
def setup
size 640, 360
@x = width/2
@y = height/2
@outer_radius = min(width, height) * 0.4
@inner_radius = outer_radius * 0.6
end
def draw
background 204
pts = map(mouse_x, 0, width, 6, 60).to_i
angle = 0.0 # degrees
step = 180.0/pts # degrees
begin_shape TRIANGLE_STRIP
(0 .. pts).each do
px = x + cos(angle.radians)*outer_radius
py = y + sin(angle.radians)*outer_radius
angle += step
vertex px, py
px = x + cos(angle.radians)*inner_radius
py = y + sin(angle.radians)*inner_radius
angle += step
vertex px, py
end
end_shape
end
Version data entries
7 entries across 7 versions & 1 rubygems