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266 changes: 266 additions & 0 deletions parallax/js/picasso-dev.js
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Original file line number Diff line number Diff line change
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/*! Parallax functions
==============================================================
@name picasso-dev.js
@author Dave Gamache (@dhg)
@comments Christophe Zlobinski-Furmaniak ([email protected] or @t1wk)
@version ?
@date 05/17/2014
@category Animation scripts
@license ?

@based-on: Dave Gamache Parallax (https://medium.com/@dhg/82ced812e61c)
@based-url: http://davegamache.com/parallax/
==============================================================
*/

(function() {
$(function() {

/* Globals
-------------------------------------------------- */
// These CSS3 properties are known to be safe
var PROPERTIES = ['translateX', 'translateY', 'opacity', 'rotate', 'scale'],

// Default values
$window = $(window),
$body = $('body'),
wrappers = [],
currentWrapper = null,
scrollTimeoutID = 0,
bodyHeight = 0,
windowHeight = 0,
windowWidth = 0,
prevKeyframesDurations = 0,
scrollTop = 0,
relativeScrollTop = 0,
currentKeyframe = 0,

// Parallax animations are constructed as an object
keyframes = [
{

/* Parameters
// ---------------------------------------------------------------------- //
'wrapper' : '#element_id', // Animation container
'duration' : '100%', // Duration of the animation
'animations' : [
{
'selector' : '.name', // Name of the selector
'translateX' : 30, // (Integer, px) Translation on X Axis
'translateY' : -140, // (Integer, px) Translation on Y Axis
'opacity' : 0 // (Integer) Opacity
'scale' : 1.2 // (Integer/floating, ratio) Scale (here 120 %)
'rotate' : 90 // (Integer, degrees) Rotation
} , {
'selector' : '.second_element_to_animate',
'translateX' : '5%', // (String, %) Translation on X Axis
'translateY' : '7%', // (String, %) Translation on Y Axis
'scale' : [1, 2] // [From, to]
'opacity' : [0, 1.75] // hack to accelerate opacity speed
}
]
} */

'wrapper' : '',
'duration' : '100%',
'animations' : [
{
'selector' : '',
'translateY' : '',
'opacity' : [0, 1.75] // hack to accelerate opacity speed
}
]
}
]

/* Construction
-------------------------------------------------- */
init = function() {
scrollIntervalID = setInterval(updatePage, 10); // Prevent crazy performance hiccups
setupValues();
$window.resize(throwError)
if(isTouchDevice) {
$window.resize(throwError)
}
}

setupValues = function() {
scrollTop = $window.scrollTop();
windowHeight = $window.height();
windowWidth = $window.width();
convertAllPropsToPx();
buildPage();
}

buildPage = function() {
var i, j, k;
for(i=0;i<keyframes.length;i++) { // loop keyframes
bodyHeight += keyframes[i].duration;
if($.inArray(keyframes[i].wrapper, wrappers) == -1) {
wrappers.push(keyframes[i].wrapper);
}
for(j=0;j<keyframes[i].animations.length;j++) { // loop animations
Object.keys(keyframes[i].animations[j]).forEach(function(key) { // loop properties
value = keyframes[i].animations[j][key];
if(key !== 'selector' && value instanceof Array === false) {
var valueSet = [];
valueSet.push(getDefaultPropertyValue(key), value);
value = valueSet;
}
keyframes[i].animations[j][key] = value;
});
}
}
$body.height(bodyHeight);
$window.scroll(0);
currentWrapper = wrappers[0];
$(currentWrapper).show();
}

convertAllPropsToPx = function() {
var i, j, k;
for(i=0;i<keyframes.length;i++) { // loop keyframes
keyframes[i].duration = convertPercentToPx(keyframes[i].duration, 'y');
for(j=0;j<keyframes[i].animations.length;j++) { // loop animations
Object.keys(keyframes[i].animations[j]).forEach(function(key) { // loop properties
value = keyframes[i].animations[j][key];
if(key !== 'selector') {
if(value instanceof Array) { // if its an array
for(k=0;k<value.length;k++) { // if value in array is %
if(typeof value[k] === "string") {
if(key === 'translateY') {
value[k] = convertPercentToPx(value[k], 'y');
} else {
value[k] = convertPercentToPx(value[k], 'x');
}
}
}
} else {
if(typeof value === "string") { // if single value is a %
if(key === 'translateY') {
value = convertPercentToPx(value, 'y');
} else {
value = convertPercentToPx(value, 'x');
}
}
}
keyframes[i].animations[j][key] = value;
}
});
}
}
}

getDefaultPropertyValue = function(property) {
switch (property) {
case 'translateX':
return 0;
case 'translateY':
return 0;
case 'scale':
return 1;
case 'rotate':
return 0;
case 'opacity':
return 1;
default:
return null;
}
}

/* Animation/Scrolling
-------------------------------------------------- */
updatePage = function() {
window.requestAnimationFrame(function() {
setScrollTops();
if(scrollTop > 0 && scrollTop <= (bodyHeight - windowHeight)) {
animateElements();
setKeyframe();
}
});
}

setScrollTops = function() {
scrollTop = $window.scrollTop();
relativeScrollTop = scrollTop - prevKeyframesDurations;
}

animateElements = function() {
var animation, translateY, translateX, scale, rotate, opacity;
for(var i=0;i<keyframes[currentKeyframe].animations.length;i++) {
animation = keyframes[currentKeyframe].animations[i];
translateY = calcPropValue(animation, 'translateY');
translateX = calcPropValue(animation, 'translateX');
scale = calcPropValue(animation, 'scale');
rotate = calcPropValue(animation, 'rotate');
opacity = calcPropValue(animation, 'opacity');

$(animation.selector).css({
'transform': 'translate3d(' + translateX +'px, ' + translateY + 'px, 0) scale('+ scale +') rotate('+ rotate +'deg)',
'opacity' : opacity
})
}
}

calcPropValue = function(animation, property) {
var value = animation[property];
if(value) {
value = easeInOutQuad(relativeScrollTop, value[0], (value[1]-value[0]), keyframes[currentKeyframe].duration);
} else {
value = getDefaultPropertyValue(property);
}
// value = +value.toFixed(2)
// TEMPORARILY REMOVED CAUSE SCALE DOESN'T WORK WITHA AGRESSIVE ROUNDING LIKE THIS
return value;
}

easeInOutQuad = function (t, b, c, d) {
//sinusoadial in and out
return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
};

setKeyframe = function() {
if(scrollTop > (keyframes[currentKeyframe].duration + prevKeyframesDurations)) {
prevKeyframesDurations += keyframes[currentKeyframe].duration;
currentKeyframe++;
showCurrentWrappers();
} else if(scrollTop < prevKeyframesDurations) {
currentKeyframe--;
prevKeyframesDurations -= keyframes[currentKeyframe].duration;
showCurrentWrappers();
}
}

showCurrentWrappers = function() {
var i;
if(keyframes[currentKeyframe].wrapper != currentWrapper) {
$(currentWrapper).hide();
$(keyframes[currentKeyframe].wrapper).show();
currentWrapper = keyframes[currentKeyframe].wrapper;
}
}

/* Helpers
-------------------------------------------------- */

convertPercentToPx = function(value, axis) {
if(typeof value === "string" && value.match(/%/g)) {
if(axis === 'y') value = (parseFloat(value) / 100) * windowHeight;
if(axis === 'x') value = (parseFloat(value) / 100) * windowWidth;
}
return value;
}

throwError = function() {
$body.addClass('page-error')
}

isTouchDevice = function() {
return 'ontouchstart' in window // works on most browsers
|| 'onmsgesturechange' in window; // works on ie10
}

init();

})
}).call(this);