How can you draw a bezier curve given four points with wxPython?

Question

It appears to me that the DC's only support for curves of any sort is with splines. Are there any libraries that add bezier functionality, or is there a way to convert a bezier curve into a spline?

Hm ... what are you trying to do? Asymptote is amazing at graphics. Check out: http://asymptote.sourceforge.net/gallery/BezierSurface.asy — Hamish Grubijan, Feb 27 '10 at 02:59

score 2 · Answer 1 · edited May 23 '17 at 10:29

Given 4 control points, the formula for the associated cubic Bezier curve is not hard to compute. Once you calculate a set of points on the curve, you could use DC.DrawLines to draw it.

There is a python implementation for calculating points on generalized Bezier curves (shameless plug) here. It's generalized in the sense that it can accept an arbitrary number of control points (>2) as input to make_bezier. If you want only the 4-control point version, you can cut out pascal_row entirely and replace

combinations=pascal_row(n-1)

with

combinations=(1,3,3,1)

score 1 · Accepted Answer · answered Feb 27 '10 at 05:54

1

After a little googling, I think I'll go with wx.GraphicsContext, which supports wx.GraphicsPath. It appears to have exactly what I need, in addition to anti-aliasing (according to this page)

answered Feb 27 '10 at 05:54

Bibendum

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Good idea. It's the new way to draw in wxpython. – DrBloodmoney Feb 27 '10 at 18:11

How can you draw a bezier curve given four points with wxPython?

2 Answers2