stack.v0.min.js

var stack=function(){function t(t){return K-1>d&&d==f&&d>t?(d-=.5-m/u/2,scrollTo(0,d*u),e(),!0):void 0}function e(){var t=Math.floor(d)+(d%1?.5:0);if(t!==T){var e={};if(e[Math.floor(t)]=1,e[Math.ceil(t)]=1,T>=0){var n={};n[Math.floor(T)]=1,n[Math.ceil(T)]=1;for(var a in n)a in e?delete e[a]:y.deactivate.call(k[0][+a],+a)}for(var a in e)y.activate.call(k[0][+a],+a);T=t}}function n(){m=(window.innerHeight-u)/2,v=1+m/u,d3.select(g).style("margin-top",m+"px").style("margin-bottom",m+"px").style("height",(K-.5)*u+m+"px")}function a(){var t=+location.hash.slice(1);isNaN(t)||t===f||p.position(t)}function l(){var t;switch(d3.event.keyCode){case 39:if(d3.event.metaKey)return;case 40:case 34:t=d3.event.metaKey?1/0:1;break;case 37:if(d3.event.metaKey)return;case 38:case 33:t=d3.event.metaKey?-1/0:-1;break;case 32:t=d3.event.shiftKey?-1:1;break;default:return}c&&(c=clearTimeout(c)),null==h&&(h=(t>0?Math.floor:Math.ceil)(d==f?f:d+(.5-m/u/2))),p.position(h=Math.max(0,Math.min(K-1,h+t))),d3.event.preventDefault()}function o(){g!==x&&x.scrollTop&&(g=x);var n=Math.max(0,g.scrollTop/u);if(n>=K-1.51+m/u&&(n=K-1),!t(n)){var a=Math.max(0,Math.floor(d=n)),l=Math.min(v,2*(d%1));f!=a&&(location.replace("#"+a),f=a),k.classed("active",!1),d3.select(k[0][f]).style("-webkit-transform",l?"translate3d(0,"+-l*u+"px,0)":null).style("-o-transform",l?"translate(0,"+-l*u+"px)":null).style("-moz-transform",l?"translate(0,"+-l*u+"px)":null).style("transform",l?"translate(0,"+-l*u+"px)":null).classed("active",l!=v),d3.select(k[0][f+1]).style("-webkit-transform",l?"translate3d(0,0,0)":null).style("-o-transform",l?"translate(0,0)":null).style("-moz-transform",l?"translate(0,0)":null).style("transform",l?"translate(0,0)":null).classed("active",l>0),e()}}function r(){var t=d3.event.clientY;if(t!==i&&(i=t,null==h)){var e=p.position(),n=Math.max(0,Math.round(e+.25));0>=e||e>=K-1.51+m/u||(n>e&&.5-m/u>n-e?scrollTo(0,n*u):n!==e&&p.position(n))}}function s(t){return function(){var e=d3.interpolateNumber(this.scrollTop,t*u);return function(t){scrollTo(0,e(t)),o()}}}var c,i,u,d,f,h,v,m,p={},y=d3.dispatch("activate","deactivate"),k=d3.selectAll("section"),M=d3.select(window),g=document.body,x=document.documentElement,b=250,w="cubic-in-out",T=-1,K=k[0].length;return k.classed("stack",!0).style("z-index",function(t,e){return K-e}),k.classed("active",!0),u=k.node().getBoundingClientRect().height,k.classed("active",!1),p.position=function(e){var n=g.scrollTop/u;return arguments.length<1?n:(e>=K?e=K-1:0>e&&(e=Math.max(0,K+e)),e=Math.floor(e),n-e&&(M.on("scroll.stack",null),t(e),d3.select(g).transition().duration(b).ease(w).tween("scrollTop",s(h=e)).each("end",function(){h=null,M.on("scroll.stack",o)})),location.replace("#"+e),p)},k.style("display")!="block"?(M.on("keydown.stack",l).on("resize.stack",n).on("scroll.stack",o).on("mousemove.stack",r).on("hashchange.stack",a),n(),a(),o(),p.duration=function(t){return arguments.length?(b=t,p):b},p.ease=function(t){return arguments.length?(w=t,p):w},d3.rebind(p,y,"on"),p):void 0}();