Measure a Distance
One of the most important features of OrthoGraph, it helps measuring the distances between corners and other reference points of your drawing.
To start a measurement choose a point tapping it on the screen, and then holding your finger on the screen move it to another point that you want to measure from the first one.
OrthoGraph always reflects the entered distances instantly by moving the secondly chosen point from the first chosen into the direction of measurement.
By measuring a point from another one OrthoGraph first tries to move it without having the drawn angles unmodified. If it is not possible anymore (because of the details of your measurements) OrthoGraph will also update the angles related to the measurements.