In LibrecAD lines,points, Arcs, Polylines, Circles and many more entities can be drawn and placed in a drawing using either Absolute or Relative coordinate input. Coordinates can also be shown as 'Positive' (+) or 'Negative'(-) values.
In libreCAD`s 2D coordinate system all X units are measured horizontally and all Y units are measured vertically. In LibreCAD there is also the option to set the Relative Zero Point (small red circle).This Relative zero point can be temporarily set to a new location in a drawing so that all subsequent X and Y coordinates of entities drawn or blocks placed for example will be relative to this newly set Relative Zero Point. The absolute origin or Zero point in your drawing is where the X and Y axes cross each other (represented by a Red cross), every entity you draw is located in relation to this origin. Everything that you draw in LibreCAD will be exact and precise and will be placed there accurately based on the X,Y coordinate system. In order to get the best out of LibreCAD it is wise to have a good understanding of the coordinate system and how coordinates work.
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