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I have tried GeoGebra and sketchpad but they can only draw triangles with all edges visible. What I want is, for each triangle, only the bound of the triangle strips are drawn and the overlapped area gets darker.

It should run on Windows or available online. I just want to make draft for my graph programming ideas before creating the real program so it should be free or quite cheap. I'd rather write one myself if it is too expensive.

  • I suspect that many drawing programs can do what you ask if you set the edges to None and the fill to translucent. – Steve Barnes Jul 29 '17 at 5:48
  • Also, on what OS must it run – and what's your price limit in case the software doesn't ship for free? – Izzy Jul 29 '17 at 5:59
  • @SteveBarnes For example? – zwcloud Jul 29 '17 at 6:19
  • @lzzy Question is updated. – zwcloud Jul 29 '17 at 6:20
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I suspect that many drawing programs can do what you ask if you set the edges to None and the fill to translucent.

Example with InkScape (which is free & cross platform) but just about any drawing program could do this:

Set the fill to translucent: enter image description here

Set the edge to none: enter image description here

After some drawing and adding line terminators, for clarity, what I have looks like: enter image description here

  • Seems to be a working one. But I still failed to figure out how to use inkscap. Usage is more than Software Recommendations, so leave it at that. – zwcloud Jul 29 '17 at 7:58
  • @zwcloud - inkscape.org/en/learn/tutorials is a good starting point for learning Inkscape. – Steve Barnes Jul 29 '17 at 8:00
  • Thanks. I will have a look. – zwcloud Jul 29 '17 at 8:01

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