Kvirkel
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Not quite exact rendering of squircle mathematical curve (defined by the equation x4+y4=r4) in SVG using cubic bezier curves.
Författare/Upphovsman: The original uploader was FrostyBytes på engelska Wikipedia., Licens: CC BY-SA 2.5
A squircle (blue) compared with a rounded square (red). A squircle is a mathematical curve defined by the equation x4+y4=r4, while a rounded square is four 90° circular arcs of the same radius connected by tangent straight lines. In this construction, the two curves are arranged to coincide at angles which are multiples of 45° (i.e. 0°, 45°, 90°, 135°, etc.).
Image is a replacement for File:Squircle_squared_circle.png made by me using Inkscape and Squircle2.svg från SonicChao