When creating a polygon, how do I do it so that the lines are straight (90, 0 degrees, etc.) and when I create corners they can be right angles?
For instance, how do I create a perfect square or rectangle?
Create Polygons with Right Angles in QGIS – How to Create Polygons with Straight Lines and Right Angles in QGIS
digitizingpolygonqgisrectangle
Related Solutions
You can chose between CAD Tools plugin which is more complex and more powerful,
or Rectangles ovals digitizing plugin.
After installing the plugin you may have trouble to locate the plugin tool icon or buttons. Look for the plugin tool icons in the toolbars, they are probably in grey color.
You can create square and rectangular grids using the Vector Grid tool under Vector > Research Tools > Vector Grid.
To get the required coordinates, I suggest using the Coordinate Capture tool and then input the Xmin, Xmax, Ymin, Ymax from these captured points. Note that the units will be in the coordinate system currently used, so you might want to reproject your raster into a coordinate system with Meters. To create a rectangular grid, simply unlock the 1:1 ratio on the tool menu. You can create the grids as both polygons and polylines
Here's an example of the Vector Grid parameters:
and the output:
Best Answer
There is a Shape Digitizing toolbar in which has an option to add rectangle using different methods:
To show the toolbar, right-click the main menu and select
Shape Digitizing toolbarI am using QGIS 3.4.