Author: Pygmalion
Android GPX Player
GPX Player is a tool for Android developers that you can use to play GPX tracks on your desktop computer to mock track points on an Android device. Record a GPX or create it with your favorite GIS too... Read More
A Quick Refresher on Logarithms
Logarithm If we write \[x^2 = 121\] it is obvious that we find \(x\) by taking the square root of 121, but what if the exponent is unknown? \[2^x = 8\] The unknown value of the exponent is called the ... Read More
Georeferencing in QMapShack with QMapTool (video tutorial)
Georeferencing means that the internal coordinate system of a raster image, like a digital map or aerial photo, can be related to a ground system of geographic coordinates. Thus, we can make it appear... Read More
Cartesian Coordinates with matplotlib
In this post we’ll create an orthonormal cartesian plane with x axis, y axis and origin, using matplotlib. If you’re using jupyter first include this line to get inline charts: %matplotlib... Read More
Send a Parcelable to another App on Android
To send a parcelable to another application for it to be deserialized it is essential that: the class definitions of the class to be serialized are identical in both apps, the packages of the classes ... Read More
OpenTopoMap Viewer for Android
OpenTopoMap renders topographic maps from OSM and SRTM data. The style is based on German government maps, with a focus on landmarks and contrasting map colors. This new FOSS Android viewer uses osmdr... Read More
A Vertical Slider in HTML/JS/CSS
A while ago my colleagues and I needed a slider control on a web dashboard. A team of students was assigned to build the entire UI, but they did not quite succeed. A third party front-end developer ev... Read More
Classic Frogger with libGDX
Roger Engelbert’s excellent tutorial on building a classic Frogger clone with libGDX appears to have gone offline. A couple of months ago I based my own clone on this. It definitely needed some ... Read More
Sliding Toggle Button on Android (2)
The sliding toggle button has been modernized. It has finally been migrated to the Gradle build system and it targets recent API levels now. It has also been added to jcenter, so you can simply add it... Read More
A Radar Chart using MPAndroidChart
I’m using the MPAndroidChart library (3.0.0) to represent psychometric personality test results in a radar chart (AKA spider chart or cobweb chart). Since the documentation I found on this was e... Read More