Formula for getting vector

papawo

lana

vector(pt1[0] +1 * inch, pt2[1])

EDITED - sorry missed pt1[0]

papawo

@konstantin_shiriazdanov
can you explain pls?

konstantin_shiriazdanov

dot(p2-p1, vector(0,1)) * vector(0,1) - this part of equation creates a projection of diagonal vector from p1 to p2 onto vertical axis (defined by vector(0,1)). then you go along this projection vector from point p1 and then go along horizontal axis for 1 inch. when I say "go" i mean that we should add corresponding vector to the total summ

Jake_Rosenfeld

dot is the dot product of the two vectors.

Nice pictoral explanation:
https://www.mathsisfun.com/algebra/vectors-dot-product.html

Needlessly complicated wikipedia entry:
https://en.wikipedia.org/wiki/Dot_product

lana

vector(pt1[0] +1 * inch, pt2[1])

EDITED - sorry missed pt1[0]

papawo

That is how I interpret it. But it doesnt work. its not giving me the correct 1"

  var startPoint2D = worldToPlane(oplane, pt1);

  var endPoint2D = worldToPlane(oplane, pt2);

  var sketch1 = newSketchOnPlane(context, id + "sketch1", {

                "sketchPlane" : oplane

            });

        skRectangle(sketch1, "rectangle1", {

                    "firstCorner" : startPoint2D,

                    "secondCorner" : endPoint2D

                });

        skSolve(sketch1);

    var rect2 = vector(1 * inch, endPoint2D[1]);
....

      skRectangle(sketch2, "rectangle2", {

                    "firstCorner" : startPoint2D,

                    "secondCorner" : rect2

                });

konstantin_shiriazdanov

p3 = p1 + dot(p2-p1, vector(0,1)) * vector(0,1) + vector(1,0) * inch

papawo

@konstantin_shiriazdanov
can you explain pls?

konstantin_shiriazdanov

dot(p2-p1, vector(0,1)) * vector(0,1) - this part of equation creates a projection of diagonal vector from p1 to p2 onto vertical axis (defined by vector(0,1)). then you go along this projection vector from point p1 and then go along horizontal axis for 1 inch. when I say "go" i mean that we should add corresponding vector to the total summ

papawo

is dot a syntax?

Jake_Rosenfeld

dot is the dot product of the two vectors.

Nice pictoral explanation:
https://www.mathsisfun.com/algebra/vectors-dot-product.html

Needlessly complicated wikipedia entry:
https://en.wikipedia.org/wiki/Dot_product

konstantin_shiriazdanov

dot() is builtin FS function which gives vector dot product (vector operation defined in linear algebra, for vectors a and b dot(a, b) = length(a) * length(b) * cos(a^b) where a^b is an angle between a and b)

papawo

thank you guys! Ive learned something new today!