public static bool TryGetIntersection(StraightLine firstLine, StraightLine secondLine, out Point intersectionPoint)
{
if (firstLine.A == secondLine.A)
{
intersectionPoint = new Point(0, 0);
return(false);
}
else if (firstLine.B == 0)
{
double x = -firstLine.C;
double y = (-x * secondLine.A) + secondLine.C;
intersectionPoint = new Point(x, y);
return(true);
}
else if (secondLine.B == 0)
{
double x = -secondLine.C;
double y = (-x * firstLine.A) + firstLine.C;
intersectionPoint = new Point(x, y);
return(true);
}
else
{
double x = (secondLine.C - firstLine.C) / (firstLine.A - secondLine.A);
double y = firstLine.A * x + firstLine.C;
intersectionPoint = new Point(x, y);
return(true);
}
}
public static bool TryGetIntersection(StraightLine firstLine, LineSegment contourLine, out Point intersectionPoint)
{
double a, b, c;
if (contourLine.StartPoint.X != contourLine.EndPoint.X)
{
a = (contourLine.StartPoint.Y - contourLine.EndPoint.Y) / (contourLine.StartPoint.X - contourLine.EndPoint.X);
c = contourLine.StartPoint.Y - a * contourLine.StartPoint.X;
b = -1;
}
else
{
a = 1;
c = -contourLine.StartPoint.X;
b = 0;
}
StraightLine secondLine = new StraightLine(a, b, c);
if (!TryGetIntersection(firstLine, secondLine, out intersectionPoint))
{
return(false);
}
if (intersectionPoint.X <= Math.Max(contourLine.StartPoint.X, contourLine.EndPoint.X) && intersectionPoint.X >= Math.Min(contourLine.StartPoint.X, contourLine.EndPoint.X))
{
return(true);
}
return(false);
}
public override bool Equals(object obj)
{
StraightLine adLine = (StraightLine)obj;
return(Math.Abs(adLine.A - A) < 0.01 && Math.Abs(adLine.B - B) < 0.01 && Math.Abs(adLine.C - C) < 0.01);
}