topic API Calculate polyline length in Archicad C++ API

API Calculate polyline length

Miha Nahtigal — Wed, 28 Sep 2022 18:04:29 GMT

Is there a simple way to fetch polyline length apart from looping through memo data, vertexes and arcs?

I couldn't find one... has anyone already been through this?

Re: API Calculate polyline length

mthd — Thu, 29 Sep 2022 02:39:39 GMT

I am guessing that you already tried the measure tool ? I am not as skilled with Archicad as some are but there must be a way to determine the length of a complicated polyline in creating a bill of quantities somehow ?

Re: API Calculate polyline length

Miha Nahtigal — Thu, 29 Sep 2022 05:23:01 GMT

I am asking for C++ implementation inside an addon.

Re: API Calculate polyline length

mthd — Thu, 29 Sep 2022 06:31:41 GMT

Whoops ! I didn’t check the category first. That’s something I know nothing about lol. I hope you get a reply here from someone who knows. Have fun.

Re: API Calculate polyline length

Miha Nahtigal — Thu, 29 Sep 2022 18:19:50 GMT

I'll answer to myself...

// first point of memo.coords is dummy zeroes for (short r = 2; r <= element.polyLine.poly.nCoords; r++) { segmentLength = sqrt(pow((*memo.coords)[r].x - (*memo.coords)[r - 1].x, 2) + pow((*memo.coords)[r].y - (*memo.coords)[r - 1].y, 2)); arcIndex = FindArc(*memo.parcs, element.polyLine.poly.nArcs, r - 1); if (arcIndex >= 0) { // points with indexes r-1 and r are beginning and ending of an arc segmentLength = abs((*memo.parcs)[arcIndex].arcAngle) * segmentLength / 2 / sin(abs((*memo.parcs)[arcIndex].arcAngle)/2); } totalLength += segmentLength; }