bbcshots.coffee
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###
Create a mosaic image from all headline photos on BBC homepage
###
casper = require("casper").create()
nbLinks = 0
currentLink = 1
images = []
# helper to hide some element from remote DOM
casper.hide = (selector) ->
@evaluate (selector) ->
document.querySelector(selector).style.display = "none"
, selector
casper.start "http://www.bbc.co.uk/", ->
nbLinks = @evaluate ->
return __utils__.findAll('#promo2_carousel_items_items li').length
@echo "#{nbLinks} items founds"
# hide navigation arrows
@hide ".nav_left"
@hide ".nav_right"
@mouse.move "#promo2_carousel"
casper.waitUntilVisible ".autoplay.nav_pause", ->
@echo "Moving over pause button"
@mouse.move ".autoplay.nav_pause"
@click ".autoplay.nav_pause"
@echo "Clicked on pause button"
@waitUntilVisible ".autoplay.nav_play", ->
@echo "Carousel has been paused"
# hide play button
@hide ".autoplay"
# Capture carrousel area
next = ->
image = "bbcshot#{currentLink}.png"
images.push image
@echo "Processing image #{currentLink}"
@captureSelector image, '.carousel_viewport'
if currentLink < nbLinks
@click ".carousel_itemList_li[rel='#{currentLink}']"
@wait 1000, ->
@then next
currentLink++
else
@then buildPage
# Building resulting page and image
buildPage = ->
@echo "Build result page"
fs = require "fs"
@viewport 624, 400
pageHtml = "<html><body style='background:black;margin:0;padding:0'>"
images.forEach (image) ->
pageHtml += "<img src='file://#{fs.workingDirectory}/#{image}'><br>"
pageHtml += "</body></html>"
fs.write "result.html", pageHtml, 'w'
@thenOpen "file://#{fs.workingDirectory}/result.html", ->
@echo "Resulting image saved to result.png"
@capture "result.png"
casper.then next
casper.run()