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Contents
# Request Image
# by Ira Greenberg.
# From Processing for Flash Developers, Friends of ED, 2009.
#
# Shows how to use the request_image() function with preloader animation.
# The request_image() function loads images on a separate thread so that
# the sketch does not freeze while they load. It's very useful when you are
# loading large images, as this example demonstrates.
#
# To work, this example requires 10 images named dublin0.jpg ... dublin9.jpg
# in the sketch data directory. To save space, these images are not included
# with the example.
def setup
size 800, 60
@imgs = Array.new 10
@load_states = Array.new( @imgs.length, false )
@loader_x, @loader_y, @theta = 0.0, 0.0, 0.0
# Load images asynchronously
@imgs.length.times do |i|
@imgs[i] = request_image "dublin" + i.to_s + ".jpg"
end
end
def draw
background 0
run_loader_animation
# Check if individual images are fully loaded
@imgs.each_with_index do |img, i|
# As images are loaded set true in boolean array
@load_states[i] = (img.width != 0) && (img.width != -1)
end
# When all images are loaded draw them to the screen
if all_loaded?
@img.each_with_index do |img, i|
image( img, width/@imgs.length*i, 0, width/@imgs.length, height )
end
end
end
# Loading animation
def run_loader_animation
# Only run when images are loading
if all_loaded?
ellipse loader_x, loader_y, 10, 10
loader_x += 2
loader_y = height/2 + sin(theta) * (height/2.5)
theta += PI/22
# Reposition ellipse if it goes off the screen
loader_x = -5 if loader_x > (width + 5)
end
end
# Return true when all images are loaded - no false values left in array
def all_loaded?
@load_states.each { |state| return false unless state }
true
end
Version data entries
10 entries across 10 versions & 1 rubygems