Quadratic bezier curves for Processing.js

Since Processing and respectively Processing.js don’t support quadratic curves, you are forced to construct them with a conventional cubic bezier curve. I’ve never used bezier curves before, so I took this as a lesson.

I came up at least with an implementation for quadraticBezierVertex(cpx, cpy, x, y), which you can use to create shapes.

You can put this code into a .lib file and import() it into your sketch to add support for quadratic curves to Processing.js.

The actual reason I created this was the need for flexible rounded rectangles, which don’t look smart unless you use quadratic curves for the corners. Because it’s a shape based on a path you can modify fill and stroke as usual.

Finally here’s the result. I’m using a stroke weight of 2 pixels and a 10 pixel radius for the rounded corners.

36 Responses to “Quadratic bezier curves for Processing.js”

  1. Patrick says:

    Trying to do this in regular processing, but I can’t figure out what prevX and prevY are supposed to be.

  2. Michael says:

    Such internals as prevX/prevY might be hidden in native Processing as they’re just relevant to vertex based shapes. You might want to set them manually in the meanwhile.

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