[cairo] too long lines?

[Fried, Vojtech]

Hi,

 

I have a following pycairo sample and it seems to be that the black
lines are too long. They cross the red rectangle (their bounding box) at
the bottom corners. It is even more than one pixel outside the
rectangle. See http://yfrog.com/f/6clonglinesp

Am I doing anything wrong? (cairo 1.10, all surfaces I tried, both linux
and windows)

Here is the code:

import cairo

 

surf = cairo.ImageSurface( cairo.FORMAT_ARGB32, 200, 200 )

cairoctx = cairo.Context( surf )

cairoctx.rectangle( 0.0, 0.0, 200, 200 )

pat = cairo.SolidPattern( 1.0, 1.0, 1.0 )

cairoctx.set_source( pat )

cairoctx.fill()

cairoctx.set_antialias( cairo.ANTIALIAS_GRAY )

cairoctx.set_line_width( 1.0 )

 

#black lines

cairoctx.set_source_rgba( 0.0, 0.0, 0.0 )

cairoctx.move_to( 10, 110 )

cairoctx.line_to( 55, 10 )

cairoctx.line_to( 110, 110 )

cairoctx.line_to( 55, 55 )

cairoctx.close_path()

cairoctx.stroke()

 

#red bounding box

cairoctx.set_source_rgba( 1.0, 0.0, 0.0 )

cairoctx.rectangle( 10, 10, 100, 100 )

cairoctx.stroke()

 

surf.write_to_png( "out.png" )

surf.finish()

 

/Vojtech

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