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pygame.draw functions will not draw with alpha. The documentation says: Most of the arguments accept a color argument that is an RGB triplet. These can also accept an RGBA quadruplet. The alpha value will be written directly into the Surface if it contains pixel alphas, but the draw function will not draw transparently. What you can do is create a second surface and then blit it to the screen ...
I want to draw on a HTML Canvas using a mouse (for example, draw a signature, draw a name, ...) How would I go about implementing this?
However, if you just use that in your code without further change, you’ll get an “alternating” fill: You’ll need to adapt your routine to draw the star’s outline without intersecting lines (can be done by alternating between two angles), or fill the inside of the star separately (by tracing the inscribed polygon).
You can achieve smooth lines by using cardinal splines (aka canonical spline) to draw smooth curves that goes through the points. I made this function for canvas - it's split into three function to increase versatility.