Show HN: A WebGL-based Complex Expression Parser and Plotter

Heh nice, here&#x27;s a rotozoomer: <a href="http:&#x2F;&#x2F;brandonpelfrey.github.io&#x2F;complex-function-plot&#x2F;?expression=eippXigxK3QpK3oqdA==" rel="nofollow">http:&#x2F;&#x2F;brandonpelfrey.github.io&#x2F;complex-function-plot&#x2F;?expre...</a><p>edit: a nicer rotozoom: <a href="http:&#x2F;&#x2F;brandonpelfrey.github.io&#x2F;complex-function-plot&#x2F;?expression=KHoqNCkqaV4oMSt0KSsoeipwaSkqdA==" rel="nofollow">http:&#x2F;&#x2F;brandonpelfrey.github.io&#x2F;complex-function-plot&#x2F;?expre...</a>

Very nice!<p>I have spend the last hour trying to display the Poincaré disk[1], but to no avail.<p>I have z * ( cos(1.57 * (a^2+b^2+1)^(1&#x2F;2)) &#x2F; sin(1.57 * (a^2+b^2+1)^(1&#x2F;2)) ), which project the coordinates to the infinite on a circle. But this is only a fancy zoom, straight lines are not projected to circles.<p>[1]<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Poincar%C3%A9_disk_model" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Poincar%C3%A9_disk_model</a>

Note that you can apparently use the `t` variable to express time.<p>Ex: t*z

z ^ z<p>I love thinking about this, as it goes negative.