Glyphs-Handbook-2013

The x delta values respect the
italic angle set in Font Info. So,
an x delta of zero indicates a
line exactly in the italic angle.
2.7.2 Measurement Tool
Switching to the Measurement Tool (shortcut L) allows you
to see all coordinates at once.
69, 229
158, 229
-210, -250
210, -251
121, 171
-121, 172
279, 479
279, 400
279, 57
279, -22
400, 229
121, -171
-121, -172
-210, 250
210, 251
489, 229
The blue numbers are the x and y coordinates of the oncurve
points, the red numbers are the x and y delta values
between the on-curve points. These values help you check the
symmetry of your curves.
Clicking and dragging draws a ruler that displays precise
measures between all of its intersections with outlines. At the
end of the ruler, its angle is displayed in counter-clockwise
degrees, where zero degrees corresponds to dragging the ruler
completely horizontally to the right.
You can temporarily activate the ruler and the display of point
coordinates by simultaneously holding down Ctrl, Option
and Command.
2.7.3 Measurement Guidelines
Any guideline, even a global guideline, can be turned into
a measurement guideline. Simply select the guideline by
clicking on its selection handle and activate the Measurement
check box in the grey info box. You can set the angle of the
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