public bool TestCrossing(MyLine src, double[,] p)
{
if (myEnd == src.myBegin)
{
return(false);
}
if (myBegin == src.myEnd)
{
return(false);
}
if (!TwoLine2D.CrossRel(new Point(p[myBegin, 0], p[myBegin, 1]), new Point(p[myEnd, 0], p[myEnd, 1]),
new Point(p[src.myBegin, 0], p[src.myBegin, 1]), new Point(p[src.myEnd, 0], p[src.myEnd, 1]), out Point t))
{
return(false);
}
if (!TwoLine2D.TestRelOnLine(TwoLine2D.CrossStatus.And, t.X))
{
return(false);
}
if (!TwoLine2D.TestRelOnLine(TwoLine2D.CrossStatus.And, t.Y))
{
return(false);
}
if (Funcs2D.IsEqual(t.X, 0, Funcs2D.Epson) || Funcs2D.IsEqual(t.Y, 0, Funcs2D.Epson))
{
return(false); // prusecik je na zacatku usecky, nezapisu
}
f_AddCross(t.X, src.myBegin);
src.f_AddCross(t.Y, myBegin);
return(true);
}
//Zkontroluje prubeh zaobleni
// return 0 = OK
// 1 bit = je mimo prvni usecku
// 2 bit = je mimo druhou usecku
// 3 bit = body jsou na jedne primce
public static int TestRounding(Point pt1, Point pt2, Point pt3, double r)
{
int ret = 0;
double a = Vector.AngleBetween(pt2.Minus(pt1), pt3.Minus(pt2));
if (a > 0)
{
r = -r;
}
// vypocitam prusecik offsetovanych primek
Point[] p1 = Funcs2D.LineOffset(pt1, pt2, a);
if (p1 == null)
{
ret |= 1;
}
Point[] p2 = Funcs2D.LineOffset(pt2, pt3, a);
if (p2 == null)
{
ret |= 2;
}
if (ret != 0)
{
return(ret);
}
if (!TwoLine2D.CrossRel(p1[0], p1[1], p2[0], p2[1], out Point rr))
{
return(4);
}
if (!TwoLine2D.TestRelOnLine(TwoLine2D.CrossStatus.And, rr.X))
{
ret |= 1;
}
if (!TwoLine2D.TestRelOnLine(TwoLine2D.CrossStatus.And, rr.Y))
{
ret |= 2;
}
return(ret);
}
// vrati relativni souradnice pruseciku primky s polygonem
public static List <double> PolygonLineCrossingRel(IPolygonReader poly, bool closed, Point pt, Vector v)
{
if (poly == null)
{
throw (new ArgumentNullException("PolygonLineCrossing_rel(poly,..)"));
}
List <double> ret = new List <double>();
int b, e;
double[,] p = poly.CopyTo();
if (closed)
{
e = poly.Length - 1;
b = 0;
}
else
{
e = 0;
b = 1;
}
Point p1, p2;
for (int i = b; i < poly.Length; i++)
{
b = e; e = i;
p1 = new Point(p[b, 0], p[b, 1]);
p2 = new Point(p[e, 0], p[e, 1]);
if (TwoLine2D.CrossRel(pt, v, p1, p2.Minus(p1), out Point pr))
{
if (TwoLine2D.TestRelOnLine(TwoLine2D.CrossStatus.And, pr.Y))
{
ret.Add(pr.X);
}
}
}
ret.Sort();
return(ret);
}
/// <summary>
/// oblouk tvoreny dvema po sobe jdoucimi useckami a polomerem
/// takzvane zaobleni rohu
/// pokud je polomer zaporny vytvori se tzv. vykousnuti se stredem ve spolecnem bode
/// objekt se nastavi na empty pokud jsou usecky rovnobezne nebo jedna z nich ma nulovou delku
/// </summary>
/// <param name="pt1">pocatecni bod prvni ridici usecky</param>
/// <param name="pt2">spolecny bod ridicich usecek</param>
/// <param name="pt3">konecny bod druhe ridici usecky</param>
/// <param name="radius">polomer zaobleni, zaporny polomer provede vykousnuti</param>
/// <param name="testPt">pokud se pocatecni nebo koncovy bod vypocita mimo usecku, objekt se nastavi na Empty</param>
public Arc2D(Point pt1, Point pt2, Point pt3, double radius, bool testPt = false)
{
// zjistim smer offsetu
double a = Vector.AngleBetween(pt2.Minus(pt1), pt3.Minus(pt2));
if (a > 0)
{
a = -Math.Abs(radius);
Clockwise = false;
}
else
{
a = Math.Abs(radius);
Clockwise = true;
}
// vypocitam prusecik offsetovanych primek
Point[] p1 = Funcs2D.LineOffset(pt1, pt2, a);
Point[] p2 = Funcs2D.LineOffset(pt2, pt3, a);
if (p1 == null || p2 == null || !TwoLine2D.CrossRel(p1[0], p1[1], p2[0], p2[1], out Point rr))
{
// tri body na jedne primce
Begin = pt1; End = pt3;
Radius = 0;
return;
}
if (radius > 0)
{
if (testPt)
{
if (!TwoLine2D.TestRelOnLine(TwoLine2D.CrossStatus.And, rr.X) || !TwoLine2D.TestRelOnLine(TwoLine2D.CrossStatus.And, rr.Y))
{
// body jsou mimo usecky
Begin = pt1; End = pt3;
Radius = 0;
return;
}
}
// koeficienty prenesu do puvodnich usecek a spocitam body
Begin = Funcs2D.PointOnLine(pt1, pt2, rr.X);
End = Funcs2D.PointOnLine(pt2, pt3, rr.Y);
Radius = radius;
}
else
{
Radius = -radius;
if (testPt)
{
if (Funcs2D.Distance(pt1, pt2) < Radius || Funcs2D.Distance(pt2, pt3) < Radius)
{
// body jsou mimo usecky
Begin = pt1; End = pt3;
Radius = 0;
return;
}
}
// bod na prvni primce ve vzdalenosti abs(radius) od spolecneho bodu
Begin = Funcs2D.PointOnLineLen(pt2, pt1, Radius);
// bod na druhe primce
End = Funcs2D.PointOnLineLen(pt2, pt3, Radius);
Clockwise = !Clockwise;
}
}
