image processing - How can i read svg data stroke in pycairo? -



image processing - How can i read svg data stroke in pycairo? -

i have jpg images , inputsvgdraw, flash tool image annotation (http://www.mainada.net/inputdraw), can trace lines on generate svg datas.

svg datas sample:

<svg version="1.1" xmlns="http://www.w3.org/2000/svg" viewbox="0 0 488 325"><g fill="none" stroke-miterlimit="6" stroke-linecap="round" stroke-linejoin="round"><path d="m 307 97 l 0 -1 l -2 -1 l -10 -2 l -20 -1 l -25 5 l -22 9 l -10 9 l 0 9 l 2 12 l 16 18 l 25 11 l 25 5 l 17 -1 l 6 -4 l 3 -7 l -1 -12 l -6 -16 l -7 -13 l -11 -12 l -11 -14 l -9 -5" opacity="1" stroke="rgb(170,37,34)" stroke-width="5"/></g></svg>.

what function can manage info ?

you can read svg input using librsvg , rendering cairo. if want draw annotations in svg on initial image, might need utilize pil numpy since cairo doesn't load many different image formats.

following illustration achieves (the difference tested ad-hoc ctypes wrapper rsvg):

import sys import rsvg import cairo import numpy pil import image # load image supposedly has same width , height svg one. img_rgba = numpy.array(image.open(sys.argv[1]).convert('rgba')) info = numpy.array(img_rgba.tostring('raw', 'bgra')) width, height = img_rgba.size surface = cairo.imagesurface.create_for_data(data, cairo.format_argb32, width, height) ctx = cairo.context(surface) # "paste" svg image. svg = rsvg.handle(file=sys.argv[2]) svg.render_cairo(ctx) surface.write_to_png(sys.argv[3])

image-processing svg pycairo

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