I wrote the ActivityLog2 as an application to analyze training data on the local computer, to avoid using a cloud service, and I also wanted a convenient way to download data off my Garmin watch without having to hook up USB cables to my laptop. The result is the PiFitSync project which I had running for several years now, evolving to download data from three generations of Garmin devices.
Can you write GUI applications in Racket? Different versions of this question shows up periodically on various Racket forums, and, of course, Racket does have a GUI Library. However, usually the person asking the question implies a bit more, and it is not always clear what this “a bit more” is…
Rather than attempting to answer the question myself, I decided to just put together some screenshots of an application I wrote using Racket.
… that is the question. To find the answer will use a logic programming DSL embedded in Racket, named miniKanren.
By the way, if you are in a hurry: the German owns the Fish. Twice.
… in which we explore using interval renderers and color maps to create a plot where the area under the line is shaded based on data from a second data series.
The Box and Whiskers plot is a method for depicting groups of numerical data through their quartiles and it is a popular way to depict statistical information about data sets, yet the Racket plot package does not support such a plot type. In this blog post we’ll explore how to add this plot type to the plot package without having to modify the package itself, and we’ll look at some useful techniques of extending the plot package.
As part of preparing for a bicycle race in my local city I wanted to look at the climbs of the bike route and evaluate their difficulty. Since all the (free) online tools only provided basic analysis tools, I decided to write my own.
There is no specific animation function in the Racket plot package, but animations can be build by repeatedly plotting individual frames onto a canvas or image using
plot/dc. The technique requires drawing the entire plot every frame, which will be inefficient for complex plots. In this blog post we explore how to construct plot animations using the
set-overlay-renderers method of a plot snip, which is a more efficient method when plots are embedded in GUI applications.
As part of writing the geoid package, I needed to visualize some geographic projections and I discovered that the 3D plotting facilities in the racket plot package can be easily used for this task. The geoid package and the projection it uses is somewhat complex, so, to keep things simple, this blog post covers the display of the country outlines on a globe loading the data from the GeoJSON file and using only basic plotting facilities.