[cairo] “stroke” required after “showing” Pango layout?

[Nikita Zlobin]

In Mon, 15 Jun 2020 08:44:36 +0200
"Sebastian M. Ernst" <ernst at pleiszenburg.de> wrote:

> Hi all,
> 
> I have been chasing a problem between PyCairo and PangoCairo. The
> following code illustrates it:
> 
> ```python
> import math
> import cairo
> import gi
> gi.require_version('Pango', '1.0')
> gi.require_version('PangoCairo', '1.0')
> from gi.repository import Pango, PangoCairo
> 
> surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 400, 400)
> ctx = cairo.Context(surface)
> 
> # TOP LEFT CIRCLE
> ctx.save()
> ctx.arc(100.0, 100.0, 50, 0, 2 * math.pi)
> ctx.set_source_rgba(0.0, 0.0, 1.0, 1.0)
> ctx.set_line_width(2.0)
> ctx.stroke()
> ctx.restore()
> 
> # CENTER TEXT
> ctx.save()
> layout = PangoCairo.create_layout(ctx)
> layout.set_font_description(Pango.font_description_from_string('Arial
> 10.0'))
> layout.set_markup('<b>Foo Bar</b>', -1)
> ctx.set_source_rgba(0.0, 1.0, 0.0, 1.0)
> _, text_extents = layout.get_pixel_extents()
> text_width, text_height = text_extents.width, text_extents.height
> ctx.translate(200.0, 200.0)
> ctx.translate(-text_width / 2, -text_height / 2)
> ctx.move_to(0.0, 0.0)
> PangoCairo.show_layout(ctx, layout)
> # ctx.stroke() # WHY?
> ctx.restore()
> 
> # BOTTOM RIGHT CIRCLE
> ctx.save()
> ctx.arc(300.0, 300.0, 50, 0, 2 * math.pi)
> ctx.set_source_rgba(1.0, 0.0, 0.0, 1.0)
> ctx.set_line_width(2.0)
> ctx.stroke()
> ctx.restore()
> 
> surface.write_to_png('test.png')
> ```
> 
> It results in the attached picture, also see here:
> https://i.stack.imgur.com/damCs.png
> 
> My intention is to draw two circles and text. The line between the
> text and the bottom right circle is not intended to exist. I can make
> the line disappear by adding / uncommenting the ctx.stroke() call
> directly underneath PangoCairo.show_layout in the center text code
> block.
> 
> It works, but it does not feel right. The text does not require a line
> stroke. What is going wrong? Is the stroke actually required or have I
> made another mistake?
> 
> Full disclosure: I have also posted this question on SO [1].
> 
> Best regards,
> Sebastian
> 
> 
> 1: https://stackoverflow.com/q/62376532/1672565

There is already current point set after pango layout draw, so you have
to move to new shape. Or you could try new path or sub_path.