Glyph Surface Representation ↩
This example shows how to register a defcon.Glyph representation that outputs the area of a glyph and draws the value on the glyph editor.
"""
FontParts provides the same functionality
out-of-the-box but it is not cached
"""
from defcon import Glyph, registerRepresentationFactory
from fontTools.pens.areaPen import AreaPen
from mojo.subscriber import Subscriber, registerGlyphEditorSubscriber
def glyphAreaFactory(glyph):
pen = AreaPen(glyphset=glyph.layer)
glyph.draw(pen)
return pen.value
class AreaSubscriber(Subscriber):
debug = True
def build(self):
self.glyphEditor = self.getGlyphEditor()
self.container = self.glyphEditor.extensionContainer(
identifier="com.roboFont.areaSubscriber",
location="foreground",
clear=True,
)
self.textLayer = self.container.appendTextLineSublayer(
position=(0, 0),
size=(200, 50),
pointSize=24,
fillColor=(0, 0, 0, 1),
text="",
)
def started(self):
self.updateArea()
def destroy(self):
self.container.clearSublayers()
def updateArea(self):
glyph = self.glyphEditor.getGlyph().asFontParts()
area = glyph.getRepresentation("areaRepresentation")
self.textLayer.setText(f"{area:.2f}")
def glyphEditorDidSetGlyph(self, info):
self.updateArea()
def glyphEditorGlyphDidChangeOutline(self, info):
self.updateArea()
if __name__ == "__main__":
registerRepresentationFactory(Glyph, "areaRepresentation", glyphAreaFactory)
registerGlyphEditorSubscriber(AreaSubscriber)