I’d like to extract some specific data from QGIS to be drawn in a Garmin application which uses Monkey C but I am unsure of how to do it.
Currently I use many coordinate points to portray roads made of many dots (like breadcrumbs), I’d quite like to reduce the number of points needed as it gets the XML I store them in too large too quickly so I’m wondering. The way you draw a circle in Monkey C is around a center point (x,y) and use radius to define size. (x,y,radius). I could severely reduce the number of points required if I could isolate all circle shapes in a vector layer and extract their centre coordinates and if possible radius (if that were not possible then a second coord at the perimeter of the circles would suffice as I can then calculate its radius in Monkey C by distance from those two points).
On top of that I could further reduce points by just getting the end points of straight roads (currently there appear to be multiple points in straight lines for some reason), all you need in Monkey C is two points to draw a line.
Is there a way to do this in QGIS, a plug-in, a tool in toolbox, a Python line of code?
I did make an image explaining what I’m trying to achieve but I can’t seem to add it.
What I’ve tried: The simplify tool, although this reduces the amount of points (which is really the end goal to be honest), it changes the road shape which is not necessarily ideal, I have also removed minor roads and kept just highways and secondary roads but this is not as satisfactory due to the fact I want to display a fair amount of roadway. Hence the idea I’ve come up with in the above question but am unsure where to begin.
Further information:
The map I am working from is equirectangular and the Garmin app I’m developing also uses equirectangular so any coords would transfer fine, another note is I’m not converting from polygons but instead what QGIS calls multiline strings. Looking at my provided picture the red dots are I believe the vertices/points of each line so I would have thought there is something that can detect the shape these form and identify a circle. My knowledge of anything not Monkey C is rather limited though.
