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I am trying to make a floor plan for my office, have managed to make all of the rectangular components (e.g. the rooms) however some of the desk layouts are circular and I haven't been able to work out how to make exact and measured circles. They need to have a radius of 1.45m.

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    This link talks about using buffers from points in order to create circles of a particular radius. – TsvGis Jul 22 '15 at 10:11
  • I tried this process but it just covered the whole layer rather than creating a buffer. – Peter B Jul 22 '15 at 10:58
  • are your setup measurements in meters or decimal degrees? I generally find decimal degree setup create huge buffers when I accidently used meter values – TsvGis Jul 22 '15 at 11:04
  • How can I tell/change it? – Peter B Jul 22 '15 at 12:04
  • Try Project>Project Properties>General then goto Canvas units and change to meters. Additionally, I would also be changing my coordinate reference system to a meters projects. – TsvGis Jul 25 '15 at 1:08
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Take a look at the plug in CADDigitize. It may be helpful. edit : This tool allows the user to draw circles, squares, resctangels, ellipses from many ways.

  • A one-line answer is sure to be deleted - please click 'edit' and give information about the tools available in the plugin and how they work, for example how to produce the OP's 1.45m radius circles! – Simbamangu Jul 22 '15 at 12:14
  • I worked out how to do it using CADDigitize, the circle by centre and radius tool – Peter B Jul 22 '15 at 13:42
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According to this QGIS Change Log entry for the latest 2.10 "Pisa" release of QGIS, support for true curve features, including circles, was only just added in this latest release. See the "New geometry engine" topic. It requires a datasource like PostGIS that supports true curved geometry types.

However, the documentation there is slightly ambiguous. It suggests, that although QGIS based on the screenshot there will now read and display the curves, you may as of yet not be able to create or edit them through the QGIS user interface. See the phrase:

"In general you won't see many differences on the user interface yet, but this lays the foundation for a much richer set of geospatial capabilities that we will be able to support in the future."

Maybe someone who has the latest release installed, can answer the question whether creation and editing of true curves is already supported through the user interface with Pisa.

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