Calculate angle with two points c#

Question

I have a line (DrawLine-Event) with the points (a,b) (c,d) and now I want to calculate the angle of it but I don't know how.

I tried it like this:

double atan = ((d - b) / c - a)) * Math.PI / 180;
double solution = Math.Atan(atan);
int angle = Convert.ToInt32(Math.Round(solution * 180 / Math.PI));

http://stackoverflow.com/questions/21483999/using-atan2-to-find-angle-between-two-vectors or use the dot product. — aybe, Aug 26 '15 at 14:50
[See here](http://stackoverflow.com/questions/29622850/getting-values-from-mouse-hover-on-a-class-object-c-sharp/29644962?s=1|0.4902#29644962) — TaW, Aug 26 '15 at 20:58

score 1 · Answer 1 · answered Aug 26 '15 at 14:52

1

You can use Vector.AngleBetween Method to get the angle

private Double angleBetweenExample()
{
    Vector vector1 = new Vector(20, 30);
    Vector vector2 = new Vector(45, 70);
    Double angleBetween;

    // angleBetween is approximately equal to 0.9548
    angleBetween = Vector.AngleBetween(vector1, vector2);

    return angleBetween;

}

answered Aug 26 '15 at 14:52

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Wouldn't that be the angle between the two points and not the angle of the line with those two points? – crashmstr Aug 26 '15 at 15:11
Yeah I need the angle between the line and the horizontal line.. And I never worked with vectors.. – bravobyte Aug 26 '15 at 15:25
@bravobyte Is your line passing through origin? – NASSER Aug 26 '15 at 16:30

Calculate angle with two points c#

1 Answers1