How would you make a faded, curvy line?

[Retri]

I want to draw a line between two points that curve and fade like the mock-up below.

Can anyone point me in the right direction, I'm sort of hitting dead ends on google.

[xerver]

Try searching for "masking" and/or "alpha masking"

[dimumurray]

You could try approximating the curve using a series of line segments; applying a different alpha to each successive segment. 

[mattstyles]

Yeah, its heavy but I've done something similar by drawing circles at successive points along the curve, its actually available here although I cant think of a practical use.

 

Are you after the alpha blending or the drawing of a curve?

 

For alpha, as suggested, look at using masking.

 

For the curve, look at how bezier curves work, although for the line you've drawn, you'd need more than two points.