Show glyph box ↩
Another simple example tool which subscribes to the drawBackground event.
Instead of showing the glyph space as an infinitely long vertical stripe, we want it to be displayed as a box, with a fixed height. This box starts at the font’s descender height, and is as high as its Em square.
from vanilla import *
from defconAppKit.windows.baseWindow import BaseWindowController
from mojo.events import addObserver, removeObserver
from mojo.UI import UpdateCurrentGlyphView, getDefault
from mojo.drawingTools import *
class DrawBox(BaseWindowController):
# read some user settings for use later
color = getDefault("glyphViewMarginColor")
height = getDefault("glyphViewDefaultHeight") / 2.0
useItalicAngle = getDefault("glyphViewShouldUseItalicAngleForDisplay")
def __init__(self):
self.w = FloatingWindow((123, 40), "body", minSize=(123, 200))
# a checkbox to turn the tool on/off
self.w.draw = CheckBox((10, 10, -10, 20), 'show', value=True, callback=self.updateViewCallback)
addObserver(self, "drawBox", "drawBackground")
self.setUpBaseWindowBehavior()
self.w.open()
def windowCloseCallback(self, sender):
removeObserver(self, 'drawBackground')
super(DrawBox, self).windowCloseCallback(sender)
def updateViewCallback(self, sender):
UpdateCurrentGlyphView()
def drawBox(self, info):
# get settings
if not self.w.draw.get():
return
# get glyph
glyph = info["glyph"]
if glyph is None:
return
# get font
font = glyph.getParent()
if font is None:
return
# get box top/bottom
descender = font.info.descender
upm = font.info.unitsPerEm
save()
# use italic angle
if self.useItalicAngle:
angle = font.info.italicAngle
if angle is not None:
skew(-angle, 0)
# draw top/bottom boxes
fill(*self.color)
rect(0, descender, glyph.width, -self.height)
rect(0, descender + upm, glyph.width, self.height)
restore()
# done
UpdateCurrentGlyphView()
# open tool
DrawBox()