//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);
}
private Object[] f_MakeCross()
{
Object[] ret = new Object[2];
List <Point> retPt = new List <Point>();
List <int> retInx = new List <int>();
Point[] bln = null, eln; // ofsetovane usecky
int b, m, e, len;
if (IsClosed)
{
b = mySrc.Length - 1;
m = 0;
len = mySrc.Length;
}
else
{
b = 0;
m = 1;
len = mySrc.Length - 1;
}
for (; m < len; m++)
{
e = m + 1;
if (e == mySrc.Length)
{
e = 0;
}
// test totoznych bodu
if (Funcs2D.IsEqual(mySrc[b].Pt, mySrc[m].Pt, Funcs2D.Epson))
{
b = m;
continue; // vynecham
}
// test tri body na jedne primce
if (Funcs2D.IsThreePointsOnLine(mySrc[b].Pt, mySrc[m].Pt, mySrc[e].Pt, Funcs2D.Epson))
{
b = m;
continue; // vynecham
}
//vypocitam offsety
if (bln == null)
{
bln = Funcs2D.LineOffset(mySrc[b].Pt, mySrc[m].Pt, mySrc[b].Offset);
}
eln = Funcs2D.LineOffset(mySrc[m].Pt, mySrc[e].Pt, mySrc[m].Offset);
if (!IsClosed && b == 0)
{
retPt.Add(bln[0]);
retInx.Add(0);
}
// prusecik
TwoLine2D.CrossAbs(bln[0], bln[1],
eln[0], eln[1],
TwoLine2D.CrossStatus.Infinite, out Point rpt);
retPt.Add(rpt);
retInx.Add(m);
if (!IsClosed && e == len)
{
retPt.Add(eln[1]);
retInx.Add(len);
}
b = m;
bln = eln;
}
if (len == 1)
{
bln = Funcs2D.LineOffset(mySrc[b].Pt, mySrc[m].Pt, mySrc[b].Offset);
retPt.Add(bln[0]);
retInx.Add(0);
retPt.Add(bln[1]);
retInx.Add(1);
}
ret[0] = retPt;
ret[1] = retInx;
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;
}
}