About inTangents and outTangents of createpath

[Taku Wilson]

The easiest way I’ve found is to add a bugle effect.

[Dan Ebberts]

I created an equilateral triangle shape and converted it to a Bezier path. After discovering that the path had 6 points rather than the 3 I expected, I was able to craft this path expression to add tangent handles. Variable m sets the size of the tangents relative to the sides of the triangle. I hope it’s helpful:

pts = points();
p = [pts[0],pts[2],pts[4]]; // get rid of extra points
m = 1/5; // multiplier
iT = [];
oT = [];
iT[0] = (p[2]-p[1])*m;
iT[1] = (p[0] - p[2])*m;
iT[2] = (p[1] - p[0])*m;
oT[0] = -iT[0];
oT[1] = -iT[1];
oT[2] = -iT[2];
createPath(p,iT,oT,true);

[Taku Wilson]

Thanks! There are three points in the triangle I created. I’m trying to understand the middle part.

[Dan Ebberts]

The part that defines the in tangents? That part takes advantage of the fact the the tangents are parallel to the vector defined by the two points opposite the current point. It’s then just a matter of sizing that vector, and then inverting it to create the out tangent.

[Taku Wilson]

I almost understand this，Thanks!