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"""
Hello World Text Example
++++++++++++++++++++++++
Blender Game Engine example of using the blf module. For this module to work we
need to use the OpenGL wrapper :class:`~bgl` as well.
"""
# import game engine modules
from bge import render
from bge import logic
# import stand alone modules
import bgl
import blf
def init():
"""init function - runs once"""
# create a new font object, use external ttf file
font_path = logic.expandPath('//Zeyada.ttf')
# store the font indice - to use later
logic.font_id = blf.load(font_path)
# set the font drawing routine to run every frame
scene = logic.getCurrentScene()
scene.post_draw = [write]
def write():
"""write on screen"""
width = render.getWindowWidth()
height = render.getWindowHeight()
# OpenGL setup
bgl.glMatrixMode(bgl.GL_PROJECTION)
bgl.glLoadIdentity()
bgl.gluOrtho2D(0, width, 0, height)
bgl.glMatrixMode(bgl.GL_MODELVIEW)
bgl.glLoadIdentity()
# BLF drawing routine
font_id = logic.font_id
blf.position(font_id, (width * 0.2), (height * 0.3), 0)
blf.size(font_id, 50, 72)
blf.draw(font_id, "Hello World")
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