loic.esp...@gmail.com wrote:
> Hi all
>
> This is my first post on this list :-)
>
> I have a web-application (developped using a python framework). In this
> web-app, I would like to print certificates for some courses.
>
> The principle :
> The course teacher has a "default" certificates, with placeholders for the
> name, and the certification name. ("Congratulations _______ you
> successfully passed the ______ course") He puts the certificate in his
> printer, and my app prints the name, and the certification on a specific
> location, to fill the placeholders.
>
> I looked at ReportLab, and Pod. They seems powerfull to build complex
> reports, but I wonder if it exists a simpler solution just to print a text
> at a specific place on the page...
>
> Thank you
I have the following quick-and-dirty wrapper for cairographics lying around
-- just added the demo.
#/usr/bin/env python3
import cairo
import math
from contextlib import contextmanager
A4 = 595, 842
_mm = 72/25.4
def mm(x):
"""Convert mm to cairo-native (point)"""
return x * _mm
class Context(object):
"""Wrapper for a cairo context object.
Methods it doesn't provide are delegated to the cairo.Context instance.
"""
def __init__(self, width, height, context):
self.width = width
self.height = height
self.context = context
def __getattr__(self, name):
"""Unknown attribute, delegate to cairo context
"""
return getattr(self.context, name)
@contextmanager
def fontsize(self, size):
"""Set fontsize temporarily to something other than 12pt"""
self.context.set_font_size(size)
yield
self.context.set_font_size(12)
def line(self, start_x, start_y, end_x, end_y):
"""Draw a line from (start_x, start_y) to (end_x, end_y)"""
self.context.move_to(start_x, start_y)
self.context.line_to(end_x, end_y)
def text_at(self, left, top, text):
"""Draw `text` at position (left, top)"""
self.context.move_to(left, top)
self.context.text_path(text)
def setup_context(
filename, size, landscape,
font="Times New Roman",
slant=cairo.FONT_SLANT_NORMAL):
"""Create a cairo drawing context suitable for
printing in landscape format.
"""
width, height = size
# http://cairographics.org/documentation/using_the_postscript_surface/
# recommends the following for printing in landscape
#
# the "natural" approach (swapping width and height directly without
# dsc_comment, translate, rotate, looked OK in Okular resulted in
misplaced
# (large left/top offset, bottom right corner clipped) output in print
surface = cairo.PSSurface(filename, width, height)
if landscape:
surface.dsc_comment("%%PageOrientation: Landscape")
context = cairo.Context(surface)
context.translate(0, height)
context.rotate(-math.pi/2)
width, height = height, width
else:
context = cairo.Context(surface)
context.select_font_face(
font, slant, cairo.FONT_WEIGHT_NORMAL)
context.set_font_size(12)
context.set_line_width(.5)
return Context(width, height, context)
if __name__ == "__main__":
def demo():
context = setup_context("tmp.ps", A4, landscape=False, font="Times")
with context.fontsize(18):
context.text_at(mm(20), mm(100), "Max Mustermann")
context.text_at(mm(120), mm(100), "Brewing")
context.fill()
demo()
If that's too dirty for you consider using cairographics directly...
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