<div dir="ltr">Fine. I can <span style="font-size:12.8px">replicate the effect without the black background, but if i draw the background i can't replicate the effect.</span><div><span style="font-size:12.8px">I do the next (No work fine):</span><div><span style="font-size:12.8px">1-Create a cairo_t paint the background and destroy this cairo_t</span></div><div><span style="font-size:12.8px">2-</span><span style="font-size:12.8px">Create a new cairo_t and create the effect and destroy this cairo_t</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">Why if i create a new cairo_t the effect fail?</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">Code:</span></div><div><span style="font-size:12.8px"><a href="http://pasted.co/634b16c6">http://pasted.co/634b16c6</a></span><br></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">Regards!!</span></div><div><div><span style="font-size:12.8px"><br></span></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">2016-01-13 21:59 GMT+01:00 Lawrence D'Oliveiro <span dir="ltr"><<a href="mailto:ldo@geek-central.gen.nz" target="_blank">ldo@geek-central.gen.nz</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Wed, 13 Jan 2016 10:52:37 +0100, Alex Vazquez wrote:<br>
<br>
> I am trying replicate the next effect with cairo<br>
> <a href="http://postimg.org/image/ieohdu29t/" rel="noreferrer" target="_blank">http://postimg.org/image/ieohdu29t/</a><br>
<br>
</span>That looks like 50% transparency between the circles, but opaque with<br>
respect to the background.<br>
<br>
This has to be done in two stages, rather like<br>
<<a href="http://default-cube.deviantart.com/art/Figure-Alpha-548702174" rel="noreferrer" target="_blank">http://default-cube.deviantart.com/art/Figure-Alpha-548702174</a>>.<br>
<span class="HOEnZb"><font color="#888888">--<br>
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