Perpendicular and Intersection of a vector. about librecad_3

[feragon]

There is no function in lc::geo::Vector, you have to create a lc::entity:Line and use the rotate function (with an angle of M_PI / 2 or -M_PI / 2).

To get the intersection of two vectors, look at lc::maths::Intersect
https://github.com/LibreCAD/LibreCAD_3/blob/master/lckernel/cad/math/intersect.h
The code will look like this :

lc::maths::Intersect intersect(lc::maths::Intersect::OnEntity, LCTOLERANCE);
intersect(v1, v2);
intersect.result(); //Contains the intersection point if it exists

[Guruprasad-Rane]

I am trying to create circle using 3points in circleoperations.lua
I need to find the circumcenter of the triangle from 3 points

function CircleOperations:Circumcenter(Point1,Point2,Point3)
    MidPoint1=Point1:mid(Point2)
    MidPoint2=Point2:mid(Point3)
    Line1=lc.entity.Line(Point1,Point2)
    Line2=lc.entity.Line(Point2,Point3)
    Line1=Line1:rotate(MidPoint1,M_PI / 2)
    Line2=Line2:rotate(MidPoint2,M_PI / 2)
end

I don't know how to correctly code rotate function and then get intersection of both lines in LUA

[feragon]

You have to replace M_PI with math.pi and it should work

[Guruprasad-Rane]

Anyways I found a direct formula for Circumcenter which is better than finding intersection of perpendicular. New code is in #206