Fix Radial Gradient Defaults

[williamgarner]

Fixed the radial gradient defaults for cx, cy, fx, fy according to https://developer.mozilla.org/en-US/docs/Web/SVG/Element/radialGradient

[paulushub]

Does this resolve any of the W3C test issues/exceptions or the exceptions in the sample files?

[williamgarner]

I don't think so (mostly because I don't know what W3C test issues/exceptions are) but I am using the package and some of my svgs are not rendering correctly because the radial gradient on the SVG doesn't define fx and fy so the package defaults them to NaN. This means the radial gradient on my image doesn't show up at all.
With this fix SVGs with radial gradients should render properly.

w3.org specifies that the defaults should be what I set them to. https://www.w3.org/TR/SVG11/pservers.html#RadialGradientElementCXAttribute

@paulushub Does that answer your question?

[paulushub]

Yes, I have added a test tool for the W3C test suite. If you fix an issue in it, please make it and check it in. Also, if you resolve any issue and the file can be public, add the file to the Tests / Issues folder.