From 67b37f97552ccdc28c2bdd49ea77d1289626c2df Mon Sep 17 00:00:00 2001
From: Georg Hopp <georg@steffers.org>
Date: Sat, 17 Sep 2016 09:28:55 +0200
Subject: [PATCH] clean parallax js

---
 app/assets/javascripts/parallax.coffee | 60 +++++++-------------------
 1 file changed, 16 insertions(+), 44 deletions(-)

diff --git a/app/assets/javascripts/parallax.coffee b/app/assets/javascripts/parallax.coffee
index c60d40f..44b2e3f 100644
--- a/app/assets/javascripts/parallax.coffee
+++ b/app/assets/javascripts/parallax.coffee
@@ -4,61 +4,33 @@
 #
 window.App ||= {}
 
-content_top = content_left = width_delta = height_delta = 0
-
 App.init = ->
-	$('a[href*=\\#]').each ->
-		lpath = location.pathname.replace(/^\//,'')
-		tpath = this.pathname.replace(/^\//,'')
-		if lpath == tpath and
-		location.hostname == this.hostname and
-		this.hash.replace(/#/,'')
-			$targetId = $(this.hash)
-			$targetAnchor = $('[name=' + this.hash.slice(1) + ']')
-			$target = if $targetId.length
-				$targetId
-			else
-				if $targetAnchor.length
-					$targetAnchor
-				else
-  				false
-
-		if $target
-			targetOffset = $target.offset().top
-
+	this.$slides = $('.section')
+	this.$menu = $("#nav a")
+	this.section = 0
+	this.$menu.each ->
+		$target = $(this.hash)
+		if $target.length
 			$(this).click ->
-				$('html, body').animate({scrollTop: targetOffset}, 1000)
+				$('html, body').animate({scrollTop: $target.offset().top}, 1000)
 				return false
 
 App.scroll = ->
+	if not this.$slides
+		return 0
 	v_scroll = $(document).scrollTop()
-	section = Math.floor(v_scroll / $(window).innerHeight())
-	[section, section+1].forEach (section) ->
-		bg_pos = -((v_scroll-(section*$(window).innerHeight()))/2)
-		section_element = $($(".section")[section])
-		if section_element and section_element.css("background-image") != "none"
-			content = section_element.find(".content")
-			content.css("display", "none")
-			section_element.css(
-				"background-position",
-				"center " + bg_pos + "px")
-			content.css("display", "block")
-
-App.scroll2 = ->
-	v_scroll = $(document).scrollTop()
-	section = 0
-	for value, index in $(".section")
-		if v_scroll >= $(value).offset().top
-			section = index
-	if not $($("#nav a")[section]).hasClass('active')
-		$("#nav a").removeClass("active")
-		$($("#nav a")[section]).addClass('active')
+	for slide,i in this.$slides
+		if v_scroll >= slide.offsetTop
+			this.section = i
+	if not $(this.$menu[this.section]).hasClass('active')
+		$(this.$menu).removeClass('active')
+		$(this.$menu[this.section]).addClass('active')
 
 $(document).on "page:change", ->
 	App.init()
 
 $(window).on "scroll", ->
-	App.scroll2()
+	App.scroll()
 
 $(document).ready ->
 	App.init()