/// <summary>
/// Returns the angle to turn to face particular coordinates.
/// </summary>
public static double AngleToCoordinates(this IWalker a, double x, double y)
{
double distToTarget = a.DistanceFrom(x, y);
double curHeading = (90.0 - a.Heading).ToRadians(); // relative to the x-axis
double xC = a.Position.X + distToTarget * Math.Cos(curHeading);
double yC = a.Position.Y + -distToTarget *Math.Sin(curHeading);
// let the built-in vector math sort it all out :-).
Vector vHeading = new Vector(a.Position.X - xC, a.Position.Y - yC);
Vector vTarget = new Vector(a.Position.X - x, a.Position.Y - y);
return(Vector.AngleBetween(vHeading, vTarget).MinimumAngle());
}
/// <summary>Calculates how many degrees a zombie/human should turn to face a particular thing</summary>
/// <returns>The angle to turn. A negative number means a left turn, a positive number means a right turn.</returns>
public static double AngleTo(this IWalker a, ITakeSpace b)
{
/*
* Thanks to Chris for inspiring me to fix this; my version didn't work, and his version didn't work either.
* (Atleast for what Yusuf was wanting them to do. XD )
*
* GreedyHuman fails on the Plentiful map with either implementation.
* On the other hand, this version works well, gives left-or-right turns, and it's short & clean too.
*/
double distToTarget = a.DistanceFrom(b);
double curHeading = (90.0 - a.Heading).ToRadians(); // relative to the x-axis
// the heading intersects a circle with radius /distAB/ at some point, call it C. Find that point of intersection.
// x = xA + r cos (heading)
// y = yA + r sin (heading)
double xC = a.Position.X + distToTarget * Math.Cos(curHeading);
double yC = a.Position.Y + -distToTarget *Math.Sin(curHeading);
// let the built-in vector math sort it all out :-).
Vector vHeading = new Vector(a.Position.X - xC, a.Position.Y - yC);
Vector vTarget = new Vector(a.Position.X - b.Position.X, a.Position.Y - b.Position.Y);
return(Vector.AngleBetween(vHeading, vTarget).MinimumAngle());
}
/// <summary>
/// Returns true if the player is close enough to interact with (e.g., bite or take socks from) the specified thing on the map
/// </summary>
public static bool IsCloseEnoughToInteractWith(this IWalker a, ITakeSpace b)
{
return(a.DistanceFrom(b) - a.Radius - b.Radius <= WorldConstants.InteractionDistance);
}