VS:AngBVec

.VectorScript|VectorScript ..VS:Function Reference|Function Reference ..VS:Function_Reference_Appendix|Appendix

Description

Returns the positive angle between the two specified vectors, in the range of 0~180 degrees.

When used with 3D vectors, the angle returned will be in a plane defined by the two vectors.

FUNCTION AngBVec(
         v1   :VECTOR;
         v2   :VECTOR) : REAL;

def vs.AngBVec(v1, v2):
    return REAL

Parameters

v1		VECTOR		First vector to be compared.
v2		VECTOR		Second vector to be compared.

Return Value

Returns a REAL value which is the angle (in degrees) between the two vectors.

Remarks

(_c_, 2022.01.20) In VS Python the vectors must be a 3-dimensional tuple in form (0.0, 0.0, 0.0), or the routine will return zero.

(_c_, 2010.12.22) See vector diagrams on VS Math.

This is precisely what Vec2Ang does, except that Vec2Ang uses the X axis as the other vector.

Example

VectorScript

PROCEDURE Example;
VAR
    pt1, pt2, pt3, pt4 :VECTOR;
BEGIN
    GetPt(pt1.x, pt1.y);
    GetPtL(pt1.x, pt1.y, pt2.x, pt2.y);
    GetPtL(pt2.x, pt2.y, pt3.x, pt3.y);
    MoveTo(pt1.x, pt1.y);
    LineTo(pt2.x, pt2.y);
    LineTo(pt3.x, pt3.y);
    pt4 := (pt1 + pt3) / 2;
    TextOrigin(pt4.x, pt4.y);
    CreateText(Concat(AngBVec(pt1 - pt2, pt3 - pt2)));
END;
RUN(Example);

Python

v1 = (12, 1, 0) # 3-dimensional tuples
v2 = (3, 15, 45)
vs.Message(str(vs.AngBVec( v1, v2 )))

Version

Availability: from All Versions