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d3.js – Most simple stack layout with bars
In order to understand the physics of various visualizations I walk through the samples and gists I find, dissect them and strip them down to the bare minimum. From there I explore my own variations. I...
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d3.js – From tree to cluster and radial projection
Some visualizations seem to be more sophisticated (to implement) than they actual are, specifically the radial projections. Starting from a tree representation with nodes and links it is quite easy to...
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D3.js Getting started (again..)
The same questions as some years back: How to get started with it ? The learning curve for beginners is certainly a bit steep if you dont have a basic background in at least HTML, CSS and JavaScript,...
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Exploring a SQLite Database on Android
or “How to read SQLite DB from a desktop” SQLite is the relational, embedded, ACID compliant database that comes with Android. Due to this fact it is certainly the most deployed DB engine on this...
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Build a RESTful Webservice in less than 5 minutes
There are quite some tutorials around about building and exposing a RESTful Webservice, but some of them are outdated and make you wade through complex dependencies and tinkering with deployment...
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What’s in my boarding pass barcode ?
Since more than 10 years passengers are used to the barcode imprinted on the traditional ticket boarding pass slip, the home printed boarding pass or the boarding pass displayed in the mobile app...
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Read My Boarding Pass App
In the previous blog post I discussed the underlying standards of the BCBP (Bar Coded Boarding Pass) following IATA Reso 792. Today I will built an Android mobile app that scans the PDF417 barcode and...
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Build an Async Restful Webservice Client in Android in 5min and read BA...
In an earlier blog post we build a Restful WS running on Wildfly, now lets build the client part for Android. Thanks to the okHttp, an Apache 2.0 licensed java and Android library, this becomes a very...
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Blockchain – Big Topic broken down to pieces
Blockchain is certainly not the latest buzzword any longer, it moved well forward on the Gartner Hype Cycle, passed the peak of inflated expectations and I am sure we will find it in the trough of...
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Blockchain – Big Topic broken down to pieces Part 2 (Bag Custody Sample)
I will continue the exploration of the basic components of the blockchain technology started in the previous post, where I implemented a basic java class to visualize hashing and the linking of blocks...
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