Drawing nodes with python

lnp · May 12, 2015, 10:53am

Is there per chance any documentation / examples on path creation? I’m going a bit nutso with the basics…

/

f = Glyphs.font
g = f.glyphs[0].layers[0]

newPath = GSPath()
newPath.moveTo((100, 100))
newPath.lineTo((800, 100))
newPath.lineTo((100, 800))
newPath.closePath()

mekkablue · May 12, 2015, 5:50pm

You need to create and add nodes like this:

newNode = GSNode()
newNode.type = GSLINE
newNode.position = (100, 100)
newPath.nodes.append( newNode )

Best to put in a function and call it with a list of positions. Feel free to search my scripts for examples, e.g.:

github.com

mekkablue/Glyphs-Scripts/blob/master/Pixelfonts/Flashify Pixels.py

#MenuTitle: Flashify Pixels
# -*- coding: utf-8 -*-
__doc__="""
Adds small bridges to diagonal pixel connections (where two pixel corners touch). Otherwise your counters may be lost in the Flash text engine.
"""



Font    = Glyphs.font
layers  = Font.selectedLayers
removeOverlapFilter = NSClassFromString("GlyphsFilterRemoveOverlap").alloc().init()

def karo( x, y ):
	koordinaten = [ [x-1,y], [x,y-1], [x+1,y], [x,y+1] ]

	karo = GSPath()
	for xy in koordinaten:
		newnode = GSNode()
		newnode.type = GSLINE
		newnode.position = (xy[0], xy[1])

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lnp · May 12, 2015, 5:53pm

Thanks Rainer!

oneweioranother · June 17, 2015, 1:08pm

I’m just curious why there’s two methods of drawing paths via scripts? One is the method used in @mekkablue’s script and documented in the Python Scripting API. And another in the Core which is what @lnp’s example was.

When would one use either?

GeorgSeifert · June 17, 2015, 3:05pm

There are differente use cases. If you just need to add a few nodes, it is easier to just add them. If you constantly convert between different outlines data formats, it might be a good idea to build you own pen (the format of the pen is explained in the Core page). Pens are explained on this page: http://www.robofab.org/objects/pen.html