I have tried this a few times and its FREE. I drew a few additions and use this tool to get a quick
rough plan. After I used SoftPlan to finish it in detail. I used a cell phone / and or Tab S Tablet
Some day Softplan may have this feature
https://play.google....magicplan&hl=en
https://www.youtube....h?v=CkYnu4Gd0Do