resizing window - how to keep fonts in original aspect ratio?

[Andreas]

Hi,

I'm trying to figure out how I can keep the aspect ratio of my rendered objects constant, without distorting labels / text in my scene. In my 'on_resize()' function I call 'label.begin_update()' and 'label.end_update()', assuming that these calls will prevent the label from getting scaled. However this does not work - I'm probably doing something wrong here.

Does anybody have a suggestion on how to preserve the text / label? I'm using pyglet 1.1.4.

thanks!

andreas

import pyglet

from pyglet.gl import *

class myWindow(pyglet.window.Window):

def __init__(self, *args, **kwargs):

pyglet.window.Window.__init__(self, *args, **kwargs)

def setup(self):

self.labels = []

self.labels.append(pyglet.text.Label(

  """dummy text""",

  font_size=12,

  x=130, y=130, anchor_x = 'left', anchor_y = 'center'))

glClearColor(0, 0, 0, 1.0)

glPointSize(5)

def draw_square(self):

  glLineWidth(1)

  glBegin(GL_LINE_LOOP)

  glVertex2f(100, 100)

  glVertex2f(400, 100)

  glVertex2f(400, 400)

  glVertex2f(100, 400)

  glEnd()

def on_draw(self):

glEnable(GL_NORMALIZE)

glPushMatrix()

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

# draw the square and the text label

self.draw_square()

for label in self.labels:

label.draw()

glPopMatrix()

def on_resize(self, w, h):

# set viewport to new view dimensions but don't scale text labels

for label in self.labels:

label.begin_update()

glViewport(0, 0, w, h)

glMatrixMode(GL_PROJECTION)

glLoadIdentity()

glOrtho(0, W, 0, H, -1.0, 1.0)

glMatrixMode(GL_MODELVIEW)

for label in self.labels:

label.end_update()

if __name__ == "__main__":

H = 600

W = 500

my_win = myWindow(width=W, height=H, resizable=True)

my_win.setup()

pyglet.app.run()

[Petr Viktorin]

Hello,

By calling glOrtho(0, 600, 0, 500, -1, 1), you're saying that the
window's coordinates are not in pixels, but they run from (0, 0) in
the lower-left corner to (600, 500) in the upper left. If the window
is not 6:5, a square in these coordinates won't be a square on screen.

There are two possibilities here: either you wanted to say glOrtho(0,
w, 0, h, -1, 1) ­­-- note the lowercase -- and use pixel coordinates;
or you want to use the coordinates you have, in which case you'll need
to temporarily undo the scaling before drawing each label.

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