Glyphs-Handbook-2013

also rearrange the contour order and reset the starting points
of all paths to the top right nodes.
For interpolation, path order, starting points and path
directions need to be compatible and consistent throughout all
font masters. For more details on interpolation, see chapter 9,
‘Multiple Master’ (p. 73).
2.2.9 Extremes and Inflection Points
You can insert nodes on extremum points by Shift-clicking a
segment with the Path tool (P). A node will be inserted at the
nearest extremum or inflection point.
Alternatively, you can also choose Layers > Add Extremes
and nodes will be added at extremes on all paths of the
active layer. Glyphs will not add an extreme if the resulting
segment would be very short. In this case, it assumes that the
node placement was intentional.
2.3 GUIDELINES
2.3.1 Magnetic Guidelines
If you drag nodes across the canvas, red lines will appear,
indicating when you are aligned with other nodes or a vertical
metric. You can temporarily deactivate magnetic guidelines by
holding down the Ctrl key.
2.3.2 Local and Global Guidelines
To add a guideline, right- or Ctrl-click to open the context
menu and choose Add Guideline. A horizontal blue line
appears. You can activate it by clicking on it, alter its position
by clicking and dragging the little circle. Double click the circle
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