This app was originally published in 2009, and has been updated to run on modern iOS devices.
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Create and modify cubic Bézier curves.
Up to 4 connected segments can be created and modified by moving the control points.
Display the convex hull of the control points to see that a Bézier curve always stays inside it.
Use the C1 continuity hint to make the segments C1 continuous where they connect.
The resulting curves can be exported as a PNG image, and as an SVG file for further editing in programs like Inkscape and Illustrator.
This is the iPhone version of a computer graphics Java applet I wrote back in 1996.
Many enhancements are possible, suggestions are welcome at [email protected]