Chrysto Panayotov weblog
For a recent pet project I needed to add a thermal printer. I decided to go with adafruit mini thermal printer and nodejs, runned by raspberry pi zero. Once you got the printer, you need to setup it. For the tutorial, I presume that you are familiar with NodeJS and basic electronics.
Continue reading “Printing Cyrillic characters with thermal printer and Node”
At a recent project, I needed to draw an image in canvas. The app had to be fullscreen, and the image should resize in the canvas proportionally. I searched for a code that does it, but couldn’t find any. Actually it’s not very hard to write piece of code that does it and today I will guide you how.
[button url=”http://codepen.io/bassta/full/OPVzyB/” style=”green” size=”large” type=”square” icon=”view” target=”_blank”]VIEW DEMO [/button] [button url=”http://codepen.io/bassta/pen/OPVzyB” type=”square” icon=”link” target=”_blank”] FORK AT CODEPEN [/button]
Here is an effect I want to show with you, the idea is simple. The footer is not visible until you actually scroll to it. So, scroll!
[button url=”http://bassta.bg/demos/footertest/” style=”green” size=”large” type=”square” icon=”view” target=”_blank”]VIEW DEMO [/button] [button url=”http://codepen.io/bassta/pen/DdiaK/” type=”square” icon=”link” target=”_blank”] FORK AT CODEPEN [/button]
See the Pen Footer concept by Chrysto (@bassta) on CodePen.
Lately, I develop WordPress themes. The thing is, I don’t like the WordPress default css style names – I prefer BEM naming convention. If you’ve tried to style a WordPress theme, you know, that by default WordPress apply some classes to the menu items – like page_item, page-item-$ and current_page_item for the current active menu. I wanted to remove all other classes, and go with navigation__item and navigation__item-active for the current selected menu. Like almost everything in wordpress, you can change this using filters. Filter function takes as arguments hook ( think about the hook as event ) , function that will modify the output, priority and number of arguments that the function will accept. So here is the snippet:
function add_custom_classes($classes){
$newClasses[] = "navigation__item";
if( in_array('current_page_item', $classes) ){
array_push($newClasses, "navigation__item-active");
}
return $newClasses;
}
add_filter('nav_menu_css_class', 'add_custom_classes', 100, 1);
add_filter('nav_menu_item_id', 'add_custom_classes', 100, 1);
add_filter('page_css_class', 'add_custom_classes', 100, 1);
Add it to your functions.php file and you have navigation__item class set to the list items, and navigation__item-active class added to the current menu item.
Recently, I use localStorage a lot. The HTML5 Storage API is supported in all major browsers, as well as JSON’s parse and stringify methods. With this in mind, it is actually quite easy to save, edit and get javascript objects from user’s machines.
Here is the snippet I use to save objects to localStorage:
function saveToStorage(_name, _obj) {
//console.log("saved to storage", _name, _obj);
localStorage.setItem(_name, JSON.stringify(_obj));
}
Just pass a name, and a javascript object. Later, we can get the object:
function getFromStorage(_name) {
var storageData = localStorage.getItem(_name);
var storageObj = JSON.parse(storageData);
if (!storageObj) {
storageObj = {};
saveToStorage(_name, storageObj);
}
return storageObj;
}
Just pass a name of the object you want to get. If such a object doesn’t exist, the function will return new, empty javascript object.
Recently I had to develop one-pager, that had complicated animation in the header, that should progress forward/backward on page scroll. Because the page had to be very light, I decided to drop jQuery and TimelineMax and include only TweenLite and CSSPlugin. Here is the result:
See the Pen Page Header animation by Chrysto (@bassta) on CodePen.850
The script is very compact, easy to use and modify, cross-browser ( Actually DOMContentLoaded is supported IE9+ ).
Have fun forking and modifying it.
[button url=”http://codepen.io/bassta/pen/cJgkw” type=”square” icon=”link” target=”_blank”] FORK AT CODEPEN [/button]
I had a request to create a simple one-page website layout with fixed slides. You can view the result. Images copyright to Ivaylo Yovchev photography.
[button url=”http://codepen.io/bassta/pen/qykcu” type=”square” icon=”link” target=”_blank”] FORK AT CODEPEN [/button]
Wait, wasn’t there TweenMax staggerTo method? Yes, there is. I use staggered animations in a lot of my projects, but I also like to keep my javascript files as light as possible. So, for one my latest projects I needed to stagger animations, and also to have proper event handling system, but keep all as light as possible ( without including TweenMax ). So I end up digging into TweenMax code, and created this little snippet ( basically, just took the TweenMax code and modified it a bit, so it can be used standalone ) ;
var TM = {};
TM.staggerTo = function(targets, duration, vars, stagger, onCompleteAll, onCompleteAllParams, onCompleteAllScope) {
stagger = stagger || 0;
var delay = vars.delay || 0,
a = [],
finalComplete = function() {
if (vars.onComplete) {
vars.onComplete.apply(vars.onCompleteScope || this, arguments);
}
onCompleteAll.apply(onCompleteAllScope || this, onCompleteAllParams || []);
},
l, copy, i, p;
if (!$.isArray(targets)) {
if (typeof(targets) === "string") {
targets = TweenLite.selector(targets) || targets;
}
if (TweenLite._internals.isSelector(targets)) {
targets = [].slice.call(targets, 0);
}
}
l = targets.length;
for (i = 0; i < l; i++) {
copy = {};
for (p in vars) {
copy[p] = vars[p];
}
copy.delay = delay;
if (i === l - 1 && onCompleteAll) {
copy.onComplete = finalComplete;
}
a[i] = new TweenLite(targets[i], duration, copy);
delay += stagger;
}
return a;
};
It can be perfect solution for banners, where the size of the javascript files is so important. Use it just like you would use TweenMax staggerTo() method.
TM.staggerTo(targets, duration, vars, stagger, onCompleteAll, onCompleteAllParams, onCompleteAllScope)
Here is a codepen
See the Pen TweenLite staggerTo by Chrysto (@bassta) on CodePen.
Snippet: how to create neat fullscreen slides effect. It can be perfect for landing and portfolio single-page websites.
[button url=”http://bassta.bg/demos/fullscreen-slides/” style=”green” size=”large” type=”square” icon=”view” target=”_blank”] VIEW DEMO [/button] [button url=”http://bassta.bg/downloads/fullscreen-slides-files.zip” type=”square” icon=”download” target=”_blank”] DOWNLOAD FILES [/button] [button url=”http://codepen.io/bassta/pen/kDvmC/” type=”square” icon=”link” target=”_blank”] FORK AT CODEPEN [/button]
[highlight]Edit: it was featured on the first page of Codepen. Thank you all![/highlight]
I love reading medium.com. Recently, they had redesign ( Medium 1.0 ) featuring some great new effects. One of the effects I like the most is this “blurred header” effect on scroll. I created a small codepen, showing how to achieve similar effect.
[button url=”http://codepen.io/bassta/pen/iIskw” style=”green” size=”small” type=”cloud” icon=”check” target=”_blank”] View pen [/button]
[button url=”http://codepen.io/bassta/full/iIskw” style=”green” size=”small” type=”cloud” icon=”check” target=”_blank”] View fullscreen [/button]