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Contents
# Demonstrates the syntax for creating a two-dimensional (2D) array,
# fromfunction (actually a block) using MDArray (for jruby).
# Values in a 2D array are accessed through two index values.
# 2D arrays are useful for storing images. In this example, each dot
# is colored in relation to its distance from the center of the image.
require 'mdarray'
WIDTH=640
HEIGHT=360
SKIP=10
def setup
size WIDTH, HEIGHT
background 0
stroke_weight 2
max_distance = ( (WIDTH / 2 - WIDTH)**2 + (HEIGHT / 2 - HEIGHT)**2 )**0.5
distances = MDArray.fromfunction("float", [WIDTH, HEIGHT]) do |x, y|
255 * ( (WIDTH / 2 - x)**2 + (HEIGHT / 2 - y)**2 )**0.5 / max_distance
end
(SKIP ... WIDTH).step(SKIP) do |x|
(SKIP ... HEIGHT).step(SKIP) do |y|
stroke distances[x, y]
point x, y
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems