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http://zetcode.com/gfx/pycairo/backends/
Apr 19, 2016 · PyCairo backends. PyCairo supports various backends. Backends are places where the graphics produced by PyCairo can be displayed. We use PyCairo to create a PNG image, a PDF file, a SVG file, and we will draw on a GTK window.
https://www.cairographics.org/pycairo/
Pycairo is a set of Python 2 & 3 bindings for the cairo graphics library.. Since version 1.11.0 pycairo has moved to GitHub and pycairo and py2cairo have been merged back into one project.
https://pycairo.readthedocs.io/en/latest/reference/surfaces.html
A cairo.Surface is created by using backend-specific constructors of the form cairo.<XXX>Surface(). ... Emits the current page for backends that support multiple pages, but doesn’t clear it, so that the contents of the current page will be retained for the next page. ... Writes the contents of Surface to fobj as a PNG …
https://matplotlib.org/3.1.1/_modules/matplotlib/backends/backend_cairo.html
# Although it may appear natural to automatically call # `self.set_width_height(surface.get_width(), surface.get_height())` # here (instead of having the caller do so separately), this would fail # for PDF/PS/SVG surfaces, which have no way to report their extents.
https://stackoverflow.com/questions/8955006/how-to-output-transparent-png-with-pycairo
How to output transparent PNG with Pycairo? Ask Question Asked 7 years, 10 months ago. ... (24) cr.set_source_rgb(1, 1, 1) ... surface.write_to_png("MyImage.png") As you can see I'm drawing some white text to this PNG, but the background defaults to an opaque black. How do I make the png transparent so that only the white text is showing?
https://pypi.org/project/pycairo/
Pycairo is a Python module providing bindings for the cairo graphics library.It depends on cairo >= 1.13.1 and works with Python 3.5+.Pycairo, including this documentation, is licensed under the LGPL-2.1-only OR MPL-1.1.. The Pycairo bindings are designed to match the cairo C API as closely as possible, and to deviate only in cases which are clearly better implemented in a more ‘Pythonic’ way.
http://zetcode.com/gfx/pycairo/images/
PyCairo has built-in support only for PNG images. Other images can be displayed via the GdkPixbuf.Pixbuf object. It is a GTK object for manipulating images. #!/usr/bin/python ''' ZetCode PyCairo tutorial This program shows how to draw an image on a GTK window in PyCairo.
https://stackoverflow.com/questions/34595604/rotating-an-image-with-pycairo
Jan 04, 2016 · I was mostly confused with the use of Surface, and I didn't get that the Surface I had to write_to_png was the one created for the context, and not the one set as source_surface of the context later. – Kyrill Jan 5 '16 at 8:40
https://github.com/Kozea/pygal/issues/2
Jun 21, 2012 · Hi, whenever i use render_to_png everything is black. If i output the svg and load it in inkscape, everything is black, too. The objects are all there, but it seems like no styles are applied. (pygal via pip, tested with pycairo 1.8.8 an...
http://graphite.wikidot.com/installation
The default values in the examples are sane, but it is strongly recommended to consider how much data you would like to retain. By default, it will be saved for 1 day in 1 minute intervals. This is set in the whisper files individually, and changing the value here will not alter existing metrics. A conversion script shipped with Whisper (whisper-resize.py) can be used to change these later.
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