Sha256: afbb37ca8c4b2692bb6de991815feda6ac11275b17d14dfd1d1208d6ddda06bd
Contents?: true
Size: 959 Bytes
Versions: 4
Compression:
Stored size: 959 Bytes
Contents
#
# Brightness
# by Daniel Shiffman.
#
# This program adjusts the brightness of a part of the image by
# calculating the distance of each pixel to the mouse.
#
attr_reader :img
def setup
size(640, 360)
frame_rate(30)
@img = load_image("moon-wide.jpg")
img.load_pixels
# Only need to load the pixels[] array once, because we're only
# manipulating pixels[] inside draw, not drawing shapes.
load_pixels
end
def draw
(0 ... img.width).each do |x|
(0 ... img.height).each do |y|
# Calculate the 1D location from a 2D grid
loc = x + y * img.width
r = red (img.pixels[loc])
# Calculate an amount to change brightness based on proximity to the mouse
maxdist = 50 # dist(0,0,width,height)
d = dist(x, y, mouseX, mouseY)
adjustbrightness = 255 * (maxdist-d) / maxdist
r += adjustbrightness
r = constrain(r, 0, 255)
pixels[y*width + x] = color(r)
end
end
update_pixels
end
Version data entries
4 entries across 4 versions & 1 rubygems