def get_font_array(sz, chars=DEFAULT_CHARS):
from guidata.qt.QtGui import QFont, QPainter, QColor
font = QFont()
font.setFixedPitch(True)
font.setPixelSize(sz)
font.setStyleStrategy(QFont.NoAntialias)
dummy = QImage(10, 10, QImage.Format_ARGB32)
pnt = QPainter(dummy)
pnt.setFont(font)
metric = pnt.fontMetrics()
rct = metric.boundingRect(chars)
pnt.end()
h = rct.height()
w = rct.width()
img = QImage(w, h, QImage.Format_ARGB32)
paint = QPainter()
paint.begin(img)
paint.setFont(font)
paint.setBrush( QColor(255, 255, 255) )
paint.setPen( QColor(255, 255, 255) )
paint.drawRect(0, 0, w+1, h+1)
paint.setPen( QColor(0, 0, 0))
paint.setBrush( QColor(0, 0, 0) )
paint.drawText(0, paint.fontMetrics().ascent(), chars)
paint.end()
try:
data = img.bits().asstring(img.numBytes())
except SystemError:
# Python 3
return
npy = np.frombuffer(data, np.uint8)
npy.shape = img.height(), img.bytesPerLine()/4, 4
return npy[:,:, 0]
