I'm looking for a simple utility or method to get the bearing (preferably in degrees) from one pointShape or vertex to another. I've been searching for about a half hour, but can't find it. I'm sure this exists somewhere in the API.
I could write my own, but then I would have to test it myself. :D
Nate,
I recommend that you check out the Code Community project Displaying One-Way Streets, it has a custom Style, OneWayLineStyle that display an arrow on a street depending on the direction of the street. code.thinkgeo.com/projects/onewaystreets
And the logic used for that is based on a function to get the angle between two points. In the project, the function is called GetAngleFromTwoVertices and I think this is what you need.
private double GetAngleFromTwoVertices(Vertex b, Vertex c)
{
double alpha = 0;
double tangentAlpha = (c.Y - b.Y) / (c.X - b.X);
double Peta = Math.Atan(tangentAlpha);
if (c.X > b.X)
{
alpha = 90 + (Peta * (180 / Math.PI));
}
else if (c.X < b.X)
{
alpha = 270 + (Peta * (180 / Math.PI));
}
else
{
if (c.Y > b.Y) alpha = 0;
if (c.Y < b.Y) alpha = 180;
}
return alpha;
}
Perfect! Thanks.
You are welcome.