public static bool IsBetweenLines(double x, double y, LineC l1, LineC l2)
{
int a = l1.ReturnBetweenes(x, y);
int b = l2.ReturnBetweenes(x, y);
return((a > 0 && b < 0) || (a < 0 && b > 0));
}
public bool ChooseFriendTrue(NodeC n1, NodeC n2, double x, double y)
{
LineC l1 = new LineC(n1.x, n1.y, n2.x, n2.y); //line between nodes
LineC l2 = new LineC(n1.x, n1.y, l1); //line normal to l1 through n1
LineC l3 = new LineC(n2.x, n2.y, l1); //line normal to l1 through n2
return(LineC.IsBetweenLines(x, y, l2, l3) && LineC.IsOnLine(x, y, 5000, l1));
}
public static bool IsOnLine(double x, double y, int delta, LineC l)
{
double line = l.A * x + l.B * y + l.C;
return(-delta < line && line < delta);
}
public LineC(double x, double y, LineC normline)
{
A = -(1 / normline.A);
B = normline.B;
C = -(A * x + B * y);
}