public static double AngleVector1(
double aX, double aY,
double bX, double bY,
double cX, double cY)
{
// Get the dot product.
var dotProduct = DotProduct3Vector2DTests.DotProductVector2D(aX, aY, bX, bY, cX, cY);
// Get the cross product.
var crossProduct = CrossProduct3Vector2DTests.CrossProductVector2D(aX, aY, bX, bY, cX, cY);
// Calculate the angle.
return(Atan2(crossProduct, dotProduct));
}
public static double AngleVector0(
double x1, double y1,
double x2, double y2,
double x3, double y3)
{
return(Atan2(CrossProduct3Vector2DTests.CrossProductVector2D(x1, y1, x2, y2, x3, y3), DotProduct3Vector2DTests.DotProductVector2D(x1, y1, x2, y2, x3, y3)));
}