Sha256: 209c4a9f833d0f632654d5c6f447d513a5c72bf7ee0e505c951e9dae9d76ecdf
Contents?: true
Size: 972 Bytes
Versions: 5
Compression:
Stored size: 972 Bytes
Contents
#
# Storing Data as a Struct
#
# Move the mouse across the screen to change the position
# of the circles. The positions of the mouse are recorded
# into an array and played back every frame. Between each
# frame, the newest value are added to the end of each array
# and the oldest value is deleted.
#
NUM = 60
attr_reader :pos
Vec = Struct.new(:x, :y) # create named Struct Type with getters and setters
def setup
size(640, 360)
@pos = Array.new(NUM, Vec.new(0, 0)) # initialize a array of Struct
smooth(4)
no_stroke()
fill(255, 153)
end
def draw
background(51)
# Cycle through the array, using a different entry on each frame.
# Using modulo (%) like this is faster than moving all the values over.
which = frame_count % NUM
pos[which] = Vec.new(mouse_x, mouse_y)
(1 .. NUM).each do |i|
# which + 1 is the smallest (the oldest in the array)
idx = (which + i) % NUM
ellipse(pos[idx].x, pos[idx].y, i, i)
end
end
Version data entries
5 entries across 5 versions & 1 rubygems