Draw_text is ignoring position and font_size parameters

[captainunivac]

I am having problems with the canvas.draw_text() method. I have Pythonista 2.0 on an iPad and iPhone, and when I try to use the draw_text method it appears that the text is always drawn at (0, 0) in the current coordinate system. It also appears that the font_size parameter is ignored. This code on my implementation will draw the text with different fonts but with the same size and relative positions. What's up with that!

coding: utf-8

import canvas

canvas.set_size(1000, 1000)
canvas.translate(100, 100)
canvas.draw_line(0 , 0, 50, 0)
canvas.draw_line(0, 0, 0, 50)
canvas.draw_text('Hello, World', 200, 200, font_name = 'Chalkduster', font_size = 64.0)
canvas.translate(100, 100)
canvas.draw_line(0 , 0, 50, 0)
canvas.draw_line(0, 0, 0, 50)
canvas.draw_text('Hello, World', 500, -200, font_name = 'Helvetica', font_size = 128.0)

[omz]

Thanks! It looks as if this bug was introduced with the transition to 64 bit. It's easy for me to fix, but I can't think of a workaround, unfortunately.

[captainunivac]

@omz
I have a workaround for the position issue, but the font_size issue is less tractable.

def my_draw_text(txt, x, y, **kwargs):
""" my_draw_text(txt, x, y, **kwargs):

	The canvas.draw_text() method in this incarnation completely
	ignores the x and y parameters and just uses (0, 0). This
	function will use canvas.translate() to temporarily shift
	the origin to the desired point, draw the text, and then
	restore the gstate(). The keyword arguments (kwargs) are 
	font_name and font_size as in the canvas.draw_text() definition.
"""
canvas.save_gstate()
canvas.translate(x, y)
canvas.draw_text(txt, 0, 0, **kwargs)
canvas.restore_gstate()

[omz]

@captainunivac Good idea! To fix the font size, you could extend your function to use canvas.scale in addition to the translation:

def my_draw_text(txt, x, y, font_name='Helvetica', font_size=16.0):
  canvas.save_gstate()
  canvas.translate(x, y)
  canvas.scale(font_size/16.0, font_size/16.0)
  canvas.draw_text(txt, 0, 0, font_name, 16.0)
  canvas.restore_gstate()

[captainunivac]

Thanks, @omz! Will do.