I've been looking at animating vector data in #QGIS with the Temporal Controller instead of the Time Manager. I started with @tjukanov's brilliant exercise: medium.com/@tjukanov/geog…
I wanted icons not circles, but Icons have directionality & I wanted them to face the right way
I wanted icons not circles, but Icons have directionality & I wanted them to face the right way
Thanks to @HeikkiVesanto giving me the code to find out the direction to the next point in a sequence:
...which I wrapped in a function to convert to degrees, I could use a Data Defined Override to set the rotation.
https://twitter.com/HeikkiVesanto/status/1380118026993958913?s=20
...which I wrapped in a function to convert to degrees, I could use a Data Defined Override to set the rotation.
Now I had to overcome the issue of trains heading east being mirror images of trains heading west. I used InkScape to make two electric train SVG icons to account for this. Note they are facing down to avoid the 90° correction in QGIS as rotation breaks if you go over 360° 
I used a rule based styling option to use different icons depending on whether the rotation value was above or below 180° and managed to get the trains pointing the right way. The preview in QGIS didn't render the frames fast enough so I had to create the video in a video editor:
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