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#include <Prs3d_Arrow.ixx>
#include <Graphic3d_Group.hxx>
#include <Graphic3d_Array1OfVertex.hxx>
//=======================================================================
//function : Draw
//purpose :
//=======================================================================
void Prs3d_Arrow::Draw(const Handle(Prs3d_Presentation)& aPresentation,
const gp_Pnt& aLocation,
const gp_Dir& aDirection,
const Quantity_PlaneAngle anAngle,
const Quantity_Length aLength) {
Quantity_Length dx,dy,dz; aDirection.Coord(dx,dy,dz);
//
// Point of the arrow:
Quantity_Length xo,yo,zo; aLocation.Coord(xo,yo,zo);
// Center of the base circle of the arrow:
Quantity_Length xc = xo - dx * aLength;
Quantity_Length yc = yo - dy * aLength;
Quantity_Length zc = zo - dz * aLength;
// Construction of i,j mark for the circle:
Quantity_Length xn=0., yn=0., zn=0.;
if ( Abs(dx) <= Abs(dy) && Abs(dx) <= Abs(dz)) xn=1.;
else if ( Abs(dy) <= Abs(dz) && Abs(dy) <= Abs(dx)) yn=1.;
else zn=1.;
Quantity_Length xi = dy * zn - dz * yn;
Quantity_Length yi = dz * xn - dx * zn;
Quantity_Length zi = dx * yn - dy * xn;
Quantity_Length Norme = sqrt ( xi*xi + yi*yi + zi*zi );
xi = xi / Norme; yi = yi / Norme; zi = zi/Norme;
Quantity_Length xj = dy * zi - dz * yi;
Quantity_Length yj = dz * xi - dx * zi;
Quantity_Length zj = dx * yi - dy * xi;
Standard_Integer NbPoints = 15;
Graphic3d_Array1OfVertex VN(1,NbPoints+1);
Graphic3d_Array1OfVertex V2(1,2);
V2(1).SetCoord(xo,yo,zo);
Quantity_Length x,y,z;
Standard_Real cosinus,sinus, Tg=tan(anAngle);
for (Standard_Integer i = 1 ; i <= NbPoints ; i++) {
cosinus = cos ( 2 * PI / NbPoints * (i-1) );
sinus = sin ( 2 * PI / NbPoints * (i-1) );
x = xc + (cosinus * xi + sinus * xj) * aLength * Tg;
y = yc + (cosinus * yi + sinus * yj) * aLength * Tg;
z = zc + (cosinus * zi + sinus * zj) * aLength * Tg;
VN(i).SetCoord(x,y,z);
if(i==1) VN(NbPoints+1).SetCoord(x,y,z);
V2(2).SetCoord(x,y,z);
Prs3d_Root::CurrentGroup(aPresentation)->Polyline(V2);
}
Prs3d_Root::CurrentGroup(aPresentation)->Polyline(VN);
}
//=======================================================================
//function : Fill
//purpose :
//=======================================================================
void Prs3d_Arrow::Fill(const Handle(Prs3d_Presentation)& /*aPresentation*/,
const gp_Pnt& /*aLocation*/,
const gp_Dir& /*aDirection*/,
const Quantity_PlaneAngle /*anAngle*/,
const Quantity_Length /*aLength*/)
{
}
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