//-----------------------------------------------------------------------------
/// <summary>
/// Check whether a line intersect a rectangle or not.
/// </summary>
/// <param name="p1">TcPoint 1 of Line 1</param>
/// <param name="p2">TcPoint 2 of Line 1</param>
/// <param name="r">Rectangle</param>
/// <returns>True if intersects and False otherwise</returns>
static public Boolean LineIntersectRectangle(TcPoint p1, TcPoint p2, TcRectangle r)
{
return(LineIntersectsLine(p1, p2, new TcPoint(r.UpperLeftX, r.LowerRightY), new TcPoint(r.LowerRightX, r.LowerRightY)) ||
LineIntersectsLine(p1, p2, new TcPoint(r.LowerRightX, r.LowerRightY), new TcPoint(r.LowerRightX, r.UpperLeftY)) ||
LineIntersectsLine(p1, p2, new TcPoint(r.LowerRightX, r.UpperLeftY), new TcPoint(r.UpperLeftX, r.UpperLeftY)) ||
LineIntersectsLine(p1, p2, new TcPoint(r.UpperLeftX, r.UpperLeftY), new TcPoint(r.UpperLeftX, r.LowerRightY)) ||
(r.Contains(p1) && r.Contains(p2)));
}
//-----------------------------------------------------------------------------
/// <summary>
/// Check whether two lines intersect or not.
/// </summary>
/// <param name="l1p1">TcPoint 1 of Line 1</param>
/// <param name="l1p2">TcPoint 2 of Line 1</param>
/// <param name="l2p1">TcPoint 1 of Line 2</param>
/// <param name="l2p2">TcPoint 2 of Line 2</param>
/// <returns>True if intersects and False otherwise</returns>
static private Boolean LineIntersectsLine(TcPoint l1p1, TcPoint l1p2, TcPoint l2p1, TcPoint l2p2)
{
Double q = (l1p1.Y - l2p1.Y) * (l2p2.X - l2p1.X) - (l1p1.X - l2p1.X) * (l2p2.Y - l2p1.Y);
Double d = (l1p2.X - l1p1.X) * (l2p2.Y - l2p1.Y) - (l1p2.Y - l1p1.Y) * (l2p2.X - l2p1.X);
if (d == 0)
{
return(false);
}
Double r = q / d;
q = (l1p1.Y - l2p1.Y) * (l1p2.X - l1p1.X) - (l1p1.X - l2p1.X) * (l1p2.Y - l1p1.Y);
Double s = q / d;
if (r < 0 || r > 1 || s < 0 || s > 1)
{
return(false);
}
return(true);
}
public TcTileGrid(TcPoint prmUpperLeft, TcPoint prmLowerRight)
: base(prmUpperLeft, prmLowerRight)
{
}
//-----------------------------------------------------------------------------
/// <summary>
/// Calculates the angle between two points on a 2D plane.
/// </summary>
/// <param name="pt1">Point 1</param>
/// <param name="pt2">Point 2</param>
/// <returns>Angle between two points</returns>
static public Double PointAngle(TcPoint pt1, TcPoint pt2)
{
return(PointAngle(pt1.X, pt1.Y, pt2.X, pt2.Y));
}
