blf.clipping, aspect, rotation, shadow, blur

Game Engine Game Engine Support and Discussion
1

hi,
how do you use them? I can’t make it work, is it font dependent ?
thanks for any pointers.

2 
# 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('//yosh.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.clipping(font_id, (width * 0.21), (height * 0.29), (width * 0.4), (height * 0.39)) #Clip the drawing area by these bounds. Clip the full letters
    blf.enable(font_id, blf.CLIPPING)
    blf.draw(font_id, "Hello World")
    blf.disable(font_id, blf.CLIPPING)

    #blf.aspect(font_id, 0.1) # I don't konw how or if this is working
    blf.position(font_id, (width * 0.1), (height * 0.2), 0)
    blf.draw(font_id, "Hello World 2")
3

ok got it thanks HG1.
(cool post reading after a great lunch)

#blf.aspect(font_id, 0.1) # I don't konw how or if this is working

it appears blf.enable is a binary mask :


		# 1 blf.ROTATION
		# 2 blf.CLIPPING
		# 4 blf.SHADOW
		# 8 
		# 16 
		# 32 ASPECT
		blf.rotation(font_id, 30)
		blf.clipping(font_id, 100,100,800,600)
		blf.shadow(font_id , 3 ,1.0 ,0.0 ,0.0 ,1.0 )
		blf.shadow_offset(font_id ,3 ,3)
		blf.aspect(font_id, 0.6)
		blf.blur(font_id, 0) # 1,3 or 5.. ? looks like a glEnable(GLdontrememberwhich) I knew
		b = 39
		blf.enable(font_id, b)
		blf.draw(font_id, area.body)
		blf.disable(font_id, b)
		blf.draw(font_id, area.body)

aspect acts as a zoom, I cant see any ratio change with the font I use.

4

Yes blf.enable is a binary mask, but my problem was that only the first four constants (ROTATION, CLIPPING, SHADOW or KERNING_DEFAULT) are documented.
http://www.blender.org/documentation/blender_python_api_2_57_release/blf.html
I don’t know that there are more than this your values.

I looked now in the source code to find out how many constants it gives and for what the are for.
#1 blf.ROTATION
#2 blf.CLIPPING
#4 blf.SHADOW
#8 blf.KERNING_DEFAULT
#16 blf.MATRIX
#32 blf.ASPECT

5

hey guys, I’m having trouble running the codes from above. The console keeps saying ‘module’ object has no attribute ‘font_id’ referring to this line: font_id = logic.font_id

6

You must call the init not the write function with the python module controller and you must have set the path to and name of your font (yosh.ttf).

Attachments

BLF_text.zip (97.2 KB)

7

How about multiple texts on separate parts of screen?