When taking notes in paper, you can just draw anything. This freedom is taken away when using textarea-based wikis, such as MycorrhizaWiki. Indeed, you can embed pictures using mycomarkup. But it's not handy.
Here's how you insert a drawing:
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Make a drawing in an external program.
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Save the drawing in any of the supported formats.
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Attach it to a hypha.
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Embed it in a different hypha.
Tiresome! Here's the idea: you can click a button titled Insert drawing and a graphics editor fires up. Once you finish the drawing, it saved as a subhypha drawing ## and an img{} block is created.
Pictures created by this editor shall be vector, therefore, svg. The editor will be quite limited to make you focus on the real stuff.
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7 colors: main, inverse, 5 accents. No more. Colors may change depending on the theme.
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One brush.
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Drawing tablet support.
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Some basic layers?
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Picture import?
It can implemented by one person in a month.