How to resize svg image file using librsvg Python binding
cairo, librsvg, python
Solution
There is a resize function in librsvg, but it is deprecated.
Set up a scale matrix in Cairo to change the size of your drawing:
- setup a scale transformation matrix on your cairo context
- draw your SVG with the .render_cairo() method
- write your surface to PNG
Problem
When rasterizing svg file, I would like to be able to set width and height for the resulting png file. With the following code, only the canvas is set to the desired width and height, the actual image content with the original svg file dimension is rendered in the top left corner on the (500, 600) canvas. ``` import cairo import rsvg WIDTH, HEIGHT = 500, 600 surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, WIDTH, HEIGHT) ctx = cairo.Context(surface) svg = rsvg.Handle(file="test.svg") svg.render_cairo(ctx) surface.write_to_png("test.png") ``` What should I do to make the image content same size with cairo canvas? I tried ``` svg.set_property('width', 500) svg.set_property('height', 500) ``` but got ``` TypeError: property 'width' is not writable ``` Also documents for librsvg python binding seem to be extremely rare, only some random code snippets on cairo site.