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Added some documentation and error handling to the image center flag.

This commit is contained in:
Maximilian Wagenbach 2020-03-11 15:51:16 +01:00
parent 51d1299285
commit cc67cb1c1e
1 changed files with 7 additions and 0 deletions
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7
src/escpos/escpos.py
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@ -106,6 +106,9 @@ class Escpos(object):
* `graphics`: prints with the `GS ( L`-command * `graphics`: prints with the `GS ( L`-command
* `bitImageColumn`: prints with the `ESC *`-command * `bitImageColumn`: prints with the `ESC *`-command
When trying to center an image make sure you have initialized the printer with a valid profile, that
contains a media width pixel field. Otherwise the centering will have no effect.
:param img_source: PIL image or filename to load: `jpg`, `gif`, `png` or `bmp` :param img_source: PIL image or filename to load: `jpg`, `gif`, `png` or `bmp`
:param high_density_vertical: print in high density in vertical direction *default:* True :param high_density_vertical: print in high density in vertical direction *default:* True
:param high_density_horizontal: print in high density in horizontal direction *default:* True :param high_density_horizontal: print in high density in horizontal direction *default:* True
@ -117,6 +120,10 @@ class Escpos(object):
im = EscposImage(img_source) im = EscposImage(img_source)
try: try:
if self.profile.profile_data['media']['width']['pixels'] == "Unknown":
print("The media.width.pixel field of the printer profile is not set. " +
"The center flag will have no effect.")
max_width = int(self.profile.profile_data['media']['width']['pixels']) max_width = int(self.profile.profile_data['media']['width']['pixels'])
if im.width > max_width: if im.width > max_width: