public static void MouseMovement(List <Point> vertices, Point mousePos, Graphics graphics, Pen pen)
{
MousePos = mousePos;
var penForTemLine = new Pen(Color.DarkGray, pen.Width);
if (vertices.Count > 0)
{
_distanceToFirstPoint = CalculationUtil.GetDistance(vertices[0], MousePos);
}
}
/// <summary>
/// Returns a point that equals a point in a given list,
/// if the points distance to the point in the list is smaller
/// than the given tolerated ratio.
/// </summary>
private static int ChooseVertex(List <Point> vertices, int toleratedRatio)
{
int indexOfChosenPoint = vertices.Count;
foreach (var vertex in vertices)
{
if (CalculationUtil.GetDistance(MousePos, vertex) < toleratedRatio)
{
indexOfChosenPoint = vertices.IndexOf(vertex);
}
}
return(indexOfChosenPoint);
}
/// <summary>
/// This function determines wether to given lines interesect
/// by checking if there is a intersection point, assuming the lines are infinite.
/// If there is one the function checks if both lines (finite) contain this intersection point.
/// </summary>
public static bool Intersect(Line line1, Line line2)
{
Point IntersectionPoint;
double thisA = line1.AllPointsOfElement[1].Y - line1.AllPointsOfElement[0].Y;
double thisB = line1.AllPointsOfElement[0].X - line1.AllPointsOfElement[1].X;
double thisC = line1.AllPointsOfElement[0].X * thisA + line1.AllPointsOfElement[0].Y * thisB;
double thatA = line2.AllPointsOfElement[1].Y - line2.AllPointsOfElement[0].Y;
double thatB = line2.AllPointsOfElement[0].X - line2.AllPointsOfElement[1].X;
double thatC = line2.AllPointsOfElement[0].X * thatA + line2.AllPointsOfElement[0].Y * thatB;
double det = thisA * thatB - thatA * thisB;
if (det == 0)
{
return(false);
}
else
{
double xNew = (thatB * thisC - thisB * thatC) / det;
double yNew = (thisA * thatC - thatA * thisC) / det;
IntersectionPoint = new Point(Convert.ToInt32(xNew), Convert.ToInt32(yNew));
}
double LineLength1 = CalculationUtil.GetDistance(line1.AllPointsOfElement[0], line1.AllPointsOfElement[1]);
double LineLenght2 = CalculationUtil.GetDistance(line2.AllPointsOfElement[0], line2.AllPointsOfElement[1]);
double proofLineLength1 = CalculationUtil.GetDistance(line1.AllPointsOfElement[0], IntersectionPoint);
double proofLineLength2 = CalculationUtil.GetDistance(line1.AllPointsOfElement[1], IntersectionPoint);
double proofLineLength3 = CalculationUtil.GetDistance(line2.AllPointsOfElement[0], IntersectionPoint);
double proofLineLength4 = CalculationUtil.GetDistance(line2.AllPointsOfElement[1], IntersectionPoint);
if ((proofLineLength1 < LineLength1 && proofLineLength2 < LineLength1) && (proofLineLength3 < LineLenght2 && proofLineLength4 < LineLenght2))
{
return(true);
}
else
{
return(false);
}
}
