Parallel Lines coordinate

[fsl88]

I there a code for knowing the 2 coordinates as shown below. x1,y1 and x2,y2 are known coordinates, offset distance is also known. The two lines are equal in length. Thanks.

[_gile · Accepted solution]

Hi,

You can use some simple vector calculus using APIs from the Geometry namespace (GetVectorTo, GetPerpendicularVector, GetNormal).

    var pt1 = new Point2d(x1, y1);
    var pt2 = new Point2d(x2, y2);

    // Get the vector from pt1 to pt2
    var direction = pt1.GetVectorTo(pt2);

    // Get the perpendiclar vector to direction with a length of 'offsetDistance'
    var perpendicularVector = 
        direction.GetPerpendicularVector().GetNormal() * offsetDistance;

    // Offset pt1 and pt2 (substracting the vector to offset to right)
    var offsetPt1 = pt1 - perpendicularVector;
    var offsetPt2 = pt2 - perpendicularVector;