Saving 'svg_filter_line.svg'

importioimportxml.etree.ElementTreeasETimportmatplotlib.pyplotaspltimportmatplotlib.transformsasmtransformsfig1=plt.figure()ax=fig1.add_axes((0.1,0.1,0.8,0.8))# draw linesl1,=ax.plot([0.1,0.5,0.9],[0.1,0.9,0.5],"bo-",mec="b",lw=5,ms=10,label="Line 1")l2,=ax.plot([0.1,0.5,0.9],[0.5,0.2,0.7],"rs-",mec="r",lw=5,ms=10,label="Line 2")forlin[l1,l2]:# draw shadows with same lines with slight offset and gray colors.xx=l.get_xdata()yy=l.get_ydata()shadow,=ax.plot(xx,yy)shadow.update_from(l)# adjust colorshadow.set_color("0.2")# adjust zorder of the shadow lines so that it is drawn below the# original linesshadow.set_zorder(l.get_zorder()-0.5)# offset transformtransform=mtransforms.offset_copy(l.get_transform(),fig1,x=4.0,y=-6.0,units='points')shadow.set_transform(transform)# set the id for a later useshadow.set_gid(l.get_label()+"_shadow")ax.set_xlim(0.,1.)ax.set_ylim(0.,1.)# save the figure as a bytes string in the svg format.f=io.BytesIO()plt.savefig(f,format="svg")# filter definition for a gaussian blurfilter_def="""  <defs xmlns='http://www.w3.org/2000/svg'        xmlns:xlink='http://www.w3.org/1999/xlink'>    <filter id='dropshadow' height='1.2' width='1.2'>      <feGaussianBlur result='blur' stdDeviation='3'/>    </filter>  </defs>"""# read in the saved svgtree,xmlid=ET.XMLID(f.getvalue())# insert the filter definition in the svg dom tree.tree.insert(0,ET.XML(filter_def))forlin[l1,l2]:# pick up the svg element with given idshadow=xmlid[l.get_label()+"_shadow"]# apply shadow filtershadow.set("filter",'url(#dropshadow)')fn="svg_filter_line.svg"print(f"Saving '{fn}'")ET.ElementTree(tree).write(fn)

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