setop/python-escpos
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Support changing the line spacing.

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This commit is contained in:
Michael Elsdörfer
2016-08-25 15:56:32 +02:00
parent 798893caee
commit 854b75be30
3 changed files with 50 additions and 0 deletions
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23
src/escpos/escpos.py
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@@ -565,6 +565,29 @@ class Escpos(object):
else:
self._raw(TXT_INVERT_OFF)
def line_spacing(self, spacing=30, divisor=180):
""" Set line character spacing.
There are different commands for setting the line spacing, using
a different denominator:
+ line_spacing/360 of an inch, 0 <= line_spacing <= 255
3 line_spacing/180 of an inch, 0 <= line_spacing <= 255
A line_spacing/60 of an inch, 0 <= line_spacing <= 85
Some printers may not support all of them. The most commonly
available command (using a divisor of 180) is chosen.
"""
if divisor not in LINESPACING_FUNCS:
raise ValueError("divisor must be either 360, 180 or 60")
if (divisor in [360, 180] \
and (not(0 <= spacing <= 255))):
raise ValueError("spacing must be a int between 0 and 255 when divisor is 360 or 180")
if divisor == 60 and (not(0 <= spacing <= 85)):
raise ValueError("spacing must be a int between 0 and 85 when divisor is 60")
self._raw(LINESPACING_FUNCS[divisor] + six.int2byte(spacing))
def cut(self, mode=''):
""" Cut paper.