For your entertainment, I offer a simple graphic editor (on iOS 12.3.1, unfortunately, the white screen).
https://x.thunkable.com/projects/5cd131bdec33e72e52f50ebe/project/properties/designer/
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This looks great, thanks for sharing! 
Continuing experiments with drawing on canvas maps.
In this application you can create polygons (including a circle, if you change the settings in the blocks) and move them by clicking on the marker.
https://x.thunkable.com/projects/5d1660bc66cfa2bac5c0d32b/project/properties/designer/
New version of the drawing demo app.
https://x.thunkable.com/projects/5d287690be961cfc7d8a712f/project/properties/designer/
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