def write_text(self,
text,
position=None,
font=gl_font("fixed", 13),
colour=(0, 1, 0)):
"""
Write text on the screen.
Parameters
----------
text : str
The text to write.
position : Optional[Sequence[int]]
A sequence containing the horizontal and vertical positions, in
pixels, of the lower left pixel of the first line of the text.
Default is 40% of the screen right of centre, and 80% of the screen
above centre.
font : Optional[ctypes.c_void_p]
The font to use. Default is 13-point Fixed.
colour : Optional[Sequence[float]]
The text colour, as RGB values between 0 and 1. Default is green.
"""
if position is None:
x = self.width * 0.2
y = self.height * 0.4
else:
x, y = position
with gl_ortho(self.width, self.height):
with new_state():
gl.glColor3fv(colour)
gl.glRasterPos2f(x, y)
glut.glutBitmapString(font, text)
def tracked_callback(self, tracked):
self.tracked = tracked.data
if not self.tracked:
self.screen.text["tracking"] = ("Tracking lost", None,
gl_font("helvetica",
18), (1, 0, 0))
elif "tracking" in self.screen.text:
del self.screen.text["tracking"]