// @(#)root/geom:$Name: $:$Id: TGeoTrd1.cxx,v 1.8 2002/12/03 16:01:39 brun Exp $
// Author: Andrei Gheata 24/10/01
// TGeoTrd1::Contains() and DistToOut() implemented by Mihaela Gheata
/*************************************************************************
* Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
#include "TROOT.h"
#include "TGeoManager.h"
#include "TGeoVolume.h"
#include "TGeoTrd1.h"
/*************************************************************************
* TGeoTrd1 - a trapezoid with only x length varying with z. It has 4
* parameters, the half length in x at the low z surface, that at the
* high z surface, the half length in y, and in z
*
*************************************************************************/
//
/*
*/
//
ClassImp(TGeoTrd1)
//-----------------------------------------------------------------------------
TGeoTrd1::TGeoTrd1()
{
// dummy ctor
fDz = fDx1 = fDx2 = fDy = 0;
SetBit(kGeoTrd1);
}
//-----------------------------------------------------------------------------
TGeoTrd1::TGeoTrd1(Double_t dx1, Double_t dx2, Double_t dy, Double_t dz)
:TGeoBBox(0,0,0)
{
// constructor.
SetBit(kGeoTrd1);
fDx1 = dx1;
fDx2 = dx2;
fDy = dy;
fDz = dz;
if ((dx1<0) || (dx2<0) || (dy<0) || (dz<0)) {
SetBit(kGeoRunTimeShape);
printf("trd1 : dx1=%f, dx2=%f, dy=%f, dz=%fn",
dx1,dx2,dy,dz);
}
else ComputeBBox();
}
//-----------------------------------------------------------------------------
TGeoTrd1::TGeoTrd1(const char *name, Double_t dx1, Double_t dx2, Double_t dy, Double_t dz)
:TGeoBBox(name, 0,0,0)
{
// constructor.
SetBit(kGeoTrd1);
fDx1 = dx1;
fDx2 = dx2;
fDy = dy;
fDz = dz;
if ((dx1<0) || (dx2<0) || (dy<0) || (dz<0)) {
SetBit(kGeoRunTimeShape);
printf("trd1 : dx1=%f, dx2=%f, dy=%f, dz=%fn",
dx1,dx2,dy,dz);
}
else ComputeBBox();
}
//-----------------------------------------------------------------------------
TGeoTrd1::TGeoTrd1(Double_t *param)
:TGeoBBox(0,0,0)
{
// ctor with an array of parameters
// param[0] = dx1
// param[1] = dx2
// param[2] = dy
// param[3] = dz
SetBit(kGeoTrd1);
SetDimensions(param);
if ((fDx1<0) || (fDx2<0) || (fDy<=0) || (fDz<=0)) SetBit(kGeoRunTimeShape);
else ComputeBBox();
}
//-----------------------------------------------------------------------------
TGeoTrd1::~TGeoTrd1()
{
// destructor
}
//-----------------------------------------------------------------------------
void TGeoTrd1::ComputeBBox()
{
// compute bounding box for a trd1
fDX = TMath::Max(fDx1, fDx2);
fDY = fDy;
fDZ = fDz;
memset(fOrigin, 0, 3*sizeof(Double_t));
}
//-----------------------------------------------------------------------------
Bool_t TGeoTrd1::Contains(Double_t *point) const
{
// test if point is inside this shape
// check Z range
if (TMath::Abs(point[2]) > fDz) return kFALSE;
// then y
if (TMath::Abs(point[1]) > fDy) return kFALSE;
// then x
Double_t dx = 0.5*(fDx2*(point[2]+fDz)+fDx1*(fDz-point[2]))/fDz;
if (TMath::Abs(point[0]) > dx) return kFALSE;
return kTRUE;
}
//-----------------------------------------------------------------------------
Double_t TGeoTrd1::DistToOut(Double_t *point, Double_t *dir, Int_t iact, Double_t step, Double_t *safe) const
{
// compute distance from inside point to surface of the trd1
Double_t snxt = kBig;
Double_t saf[6];
//--- Compute safety first
// check Z facettes
saf[0] = point[2]+fDz;
saf[1] = fDz-point[2];
Double_t fx = 0.5*(fDx1-fDx2)/fDz;
Double_t calf = 1./TMath::Sqrt(1.0+fx*fx);
Double_t salf = calf*fx;
Double_t s,cn;
// check X facettes
Double_t distx = 0.5*(fDx1+fDx2)-fx*point[2];
saf[2] = (distx+point[0])*calf;
saf[3] = (distx-point[0])*calf;
// check Y facettes
saf[4] = point[1]+fDy;
saf[5] = fDy-point[1];
if (iact<3 && safe) {
// compute safe distance
*safe = saf[TMath::LocMin(6, saf)];
if (iact==0) return kBig;
if (iact==1 && step<*safe) return step;
}
//--- Compute distance to this shape
Double_t *norm = gGeoManager->GetNormalChecked();
// first check if Z facettes are crossed
cn = -dir[2];
if (cn>0) {
snxt = saf[0]/cn;
norm[0] = norm[1] = 0;
norm[2] = -1.;
} else {
snxt = -saf[1]/cn;
norm[0] = norm[1] = 0;
norm[2] = 1.;
}
// now check X facettes
cn = -calf*dir[0]+salf*dir[2];
if (cn>0) {
s = saf[2]/cn;
if (s<snxt) {
snxt = s;
norm[0] = -calf;
norm[1] = 0;
norm[2] = salf;
}
}
cn = calf*dir[0]+salf*dir[2];
if (cn>0) {
s = saf[3]/cn;
if (s<snxt) {
snxt = s;
norm[0] = calf;
norm[1] = 0;
norm[2] = salf;
}
}
// now check Y facettes
cn = -dir[1];
if (cn>0) {
s = saf[4]/cn;
if (s<snxt) {
norm[0] = norm[2] = 0;
norm[1] = -1;
return s;
}
} else {
s = -saf[5]/cn;
if (s<snxt) {
norm[0] = norm[2] = 0;
norm[1] = 1;
return s;
}
}
return snxt;
}
//-----------------------------------------------------------------------------
void TGeoTrd1::GetVisibleCorner(Double_t *point, Double_t *vertex, Double_t *normals) const
{
// get the most visible corner from outside point and the normals
Double_t fx = 0.5*(fDx1-fDx2)/fDz;
Double_t calf = 1./TMath::Sqrt(1.0+fx*fx);
Double_t salf = calf*fx;
// check visibility of X faces
Double_t distx = 0.5*(fDx1+fDx2)-fx*point[2];
memset(normals, 0, 9*sizeof(Double_t));
TGeoTrd1 *trd1 = (TGeoTrd1*)this;
if (point[0]>distx) {
// hi x face visible
trd1->SetBit(kGeoVisX);
normals[0]=calf;
normals[2]=salf;
} else {
trd1->SetBit(kGeoVisX, kFALSE);
normals[0]=-calf;
normals[2]=salf;
}
if (point[1]>fDy) {
// hi y face visible
trd1->SetBit(kGeoVisY);
normals[4]=1;
} else {
trd1->SetBit(kGeoVisY, kFALSE);
normals[4]=-1;
}
if (point[2]>fDz) {
// hi z face visible
trd1->SetBit(kGeoVisZ);
normals[8]=1;
} else {
trd1->SetBit(kGeoVisZ, kFALSE);
normals[8]=-1;
}
SetVertex(vertex);
}
//-----------------------------------------------------------------------------
void TGeoTrd1::GetOppositeCorner(Double_t * /*point*/, Int_t inorm, Double_t *vertex, Double_t *normals) const
{
// get the opposite corner of the intersected face
TGeoTrd1 *trd1 = (TGeoTrd1*)this;
if (inorm != 0) {
// change x face
trd1->SetBit(kGeoVisX, !TestBit(kGeoVisX));
normals[0]=-normals[0];
}
if (inorm != 1) {
// change y face
trd1->SetBit(kGeoVisY, !TestBit(kGeoVisY));
normals[4]=-normals[4];
}
if (inorm != 2) {
// hi z face visible
trd1->SetBit(kGeoVisZ, !TestBit(kGeoVisZ));
normals[8]=-normals[8];
}
SetVertex(vertex);
}
//-----------------------------------------------------------------------------
Double_t TGeoTrd1::DistToIn(Double_t *point, Double_t *dir, Int_t iact, Double_t step, Double_t *safe) const
{
// compute distance from outside point to surface of the trd1
Double_t snxt = kBig;
// find a visible face
Double_t *norm = gGeoManager->GetNormalChecked();
Double_t ptnew[3];
Double_t saf[6];
memset(saf, 0, 6*sizeof(Double_t));
//--- Compute safety first
// check visibility of Z facettes
if (point[2]<-fDz) {
saf[0] = -fDz-point[2];
} else {
if (point[2]>fDz) {
saf[1] = point[2]-fDz;
}
}
Double_t fx = 0.5*(fDx1-fDx2)/fDz;
Double_t calf = 1./TMath::Sqrt(1.0+fx*fx);
Double_t salf = calf*fx;
Double_t cn;
// check visibility of X faces
Double_t distx = 0.5*(fDx1+fDx2)-fx*point[2];
if (point[0]<-distx) {
saf[2] = (-point[0]-distx)*calf;
}
if (point[0]>distx) {
saf[3] = (point[0]-distx)*calf;
}
// check visibility of Y facettes
if (point[1]<-fDy) {
saf[4] = -fDy-point[1];
} else {
if (point[1]>fDy) {
saf[5] = point[1]-fDy;
}
}
if (iact<3 && safe) {
// compute safe distance
*safe = saf[TMath::LocMax(6, saf)];
if (iact==0) return kBig;
if (iact==1 && step<*safe) return step;
}
//--- Compute distance to this shape
// first check if Z facettes are crossed
if (saf[0]>0) {
cn = -dir[2];
if (cn<0) {
snxt = -saf[0]/cn;
// find extrapolated X and Y
ptnew[0] = point[0]+snxt*dir[0];
if (TMath::Abs(ptnew[0]) < fDx1) {
ptnew[1] = point[1]+snxt*dir[1];
if (TMath::Abs(ptnew[1]) < fDy) {
// bottom Z facette is crossed
norm[0]=norm[1]=0;
norm[2] = -1;
return snxt;
}
}
}
} else {
if (saf[1]>0) {
cn = dir[2];
if (cn<0) {
snxt = -saf[1]/cn;
// find extrapolated X and Y
ptnew[0] = point[0]+snxt*dir[0];
if (TMath::Abs(ptnew[0]) < fDx2) {
ptnew[1] = point[1]+snxt*dir[1];
if (TMath::Abs(ptnew[1]) < fDy) {
// top Z facette is crossed
norm[0]=norm[1]=0;
norm[2] = 1;
return snxt;
}
}
}
}
}
// check if X facettes are crossed
if (saf[2]>0) {
cn = -calf*dir[0]+salf*dir[2];
if (cn<0) {
snxt = -saf[2]/cn;
// find extrapolated Y and Z
ptnew[1] = point[1]+snxt*dir[1];
if (TMath::Abs(ptnew[1]) < fDy) {
ptnew[2] = point[2]+snxt*dir[2];
if (TMath::Abs(ptnew[2]) < fDz) {
// lower X facette is crossed
norm[0] = -calf;
norm[1] = 0;
norm[2] = salf;
return snxt;
}
}
}
}
if (saf[3]>0) {
cn = calf*dir[0]+salf*dir[2];
if (cn<0) {
snxt = -saf[3]/cn;
// find extrapolated Y and Z
ptnew[1] = point[1]+snxt*dir[1];
if (TMath::Abs(ptnew[1]) < fDy) {
ptnew[2] = point[2]+snxt*dir[2];
if (TMath::Abs(ptnew[2]) < fDz) {
// lower X facette is crossed
norm[0] = calf;
norm[1] = 0;
norm[2] = salf;
return snxt;
}
}
}
}
// finally check Y facettes
if (saf[4]>0) {
cn = -dir[1];
if (cn<0) {
snxt = -saf[4]/cn;
// find extrapolated X and Z
ptnew[2] = point[2]+snxt*dir[2];
if (TMath::Abs(ptnew[2]) < fDz) {
ptnew[0] = point[0]+snxt*dir[0];
distx = 0.5*(fDx1+fDx2)-fx*ptnew[2];
if (TMath::Abs(ptnew[0]) < distx) {
// lower Y facette is crossed
norm[0] = norm[2] = 0;
norm[1] = -1;
return snxt;
}
}
}
} else {
if (saf[5]>0) {
cn = dir[1];
if (cn<0) {
snxt = -saf[5]/cn;
// find extrapolated X and Z
ptnew[2] = point[2]+snxt*dir[2];
if (TMath::Abs(ptnew[2]) < fDz) {
ptnew[0] = point[0]+snxt*dir[0];
distx = 0.5*(fDx1+fDx2)-fx*ptnew[2];
if (TMath::Abs(ptnew[0]) < distx) {
// higher Y facette is crossed
norm[0] = norm[2] = 0;
norm[1] = 1;
return snxt;
}
}
}
}
}
return kBig;
}
//-----------------------------------------------------------------------------
Double_t TGeoTrd1::DistToSurf(Double_t * /*point*/, Double_t * /*dir*/) const
{
// computes the distance to next surface of the sphere along a ray
// starting from given point to the given direction.
return kBig;
}
//-----------------------------------------------------------------------------
TGeoVolume *TGeoTrd1::Divide(TGeoVolume *voldiv, const char *divname, Int_t iaxis, Int_t ndiv,
Double_t start, Double_t step)
{
//--- Divide this trd1 shape belonging to volume "voldiv" into ndiv volumes
// called divname, from start position with the given step. Returns pointer
// to created division cell volume in case of Y divisions. For Z divisions just
// return the pointer to the volume to be divided. In case a wrong
// division axis is supplied, returns pointer to volume that was divided.
TGeoShape *shape; //--- shape to be created
TGeoVolume *vol; //--- division volume to be created
TGeoPatternFinder *finder; //--- finder to be attached
TString opt = ""; //--- option to be attached
Double_t zmin, zmax, dx1n, dx2n;
Int_t id;
switch (iaxis) {
case 1:
Warning("Divide", "dividing a Trd1 on X not implemented");
return voldiv;
case 2:
if (step<=0) {step=2*fDy/ndiv; start=-fDy;}
if (((start+fDy)<-1E-4) || ((start+ndiv*step-fDy)>1E-4)) {
Warning("Divide", "trd1 Y division exceed shape range");
printf(" volume was %sn", voldiv->GetName());
printf("start=%f end=%f, dy=%fn", start, start+ndiv*step, fDy);
}
finder = new TGeoPatternY(voldiv, ndiv, start, start+ndiv*step);
voldiv->SetFinder(finder);
finder->SetDivIndex(voldiv->GetNdaughters());
shape = new TGeoTrd1(fDx1, fDx2, step/2, fDz);
vol = new TGeoVolume(divname, shape, voldiv->GetMaterial());
opt = "Y";
for (id=0; id<ndiv; id++) {
voldiv->AddNodeOffset(vol, id, start+step/2+id*step, opt.Data());
((TGeoNodeOffset*)voldiv->GetNodes()->At(voldiv->GetNdaughters()-1))->SetFinder(finder);
}
return vol;
case 3:
if (step<=0) {step=2*fDz/ndiv; start=-fDz;}
if (((start+fDz)<-1E-4) || ((start+ndiv*step-fDz)>1E-4)) {
Warning("Divide", "trd1 Z division exceed shape range");
printf(" volume was %sn", voldiv->GetName());
}
finder = new TGeoPatternZ(voldiv, ndiv, start, start+ndiv*step);
voldiv->SetFinder(finder);
finder->SetDivIndex(voldiv->GetNdaughters());
for (id=0; id<ndiv; id++) {
zmin = start+id*step;
zmax = start+(id+1)*step;
dx1n = 0.5*(fDx1*(fDz-zmin)+fDx2*(fDz+zmin))/fDz;
dx2n = 0.5*(fDx1*(fDz-zmax)+fDx2*(fDz+zmax))/fDz;
shape = new TGeoTrd1(dx1n, dx2n, fDy, step/2.);
vol = new TGeoVolume(divname, shape, voldiv->GetMaterial());
opt = "Z";
voldiv->AddNodeOffset(vol, id, start+step/2+id*step, opt.Data());
((TGeoNodeOffset*)voldiv->GetNodes()->At(voldiv->GetNdaughters()-1))->SetFinder(finder);
}
return voldiv;
default:
Error("Divide", "Wrong axis type for division");
return voldiv;
}
}
//-----------------------------------------------------------------------------
TGeoVolume *TGeoTrd1::Divide(TGeoVolume *voldiv, const char * /*divname*/, Int_t /*iaxis*/, Double_t /*step*/)
{
// Divide all range of iaxis in range/step cells
Error("Divide", "Division in all range not implemented");
return voldiv;
}
//-----------------------------------------------------------------------------
void TGeoTrd1::GetBoundingCylinder(Double_t *param) const
{
//--- Fill vector param[4] with the bounding cylinder parameters. The order
// is the following : Rmin, Rmax, Phi1, Phi2
TGeoBBox::GetBoundingCylinder(param);
}
//-----------------------------------------------------------------------------
TGeoShape *TGeoTrd1::GetMakeRuntimeShape(TGeoShape *mother) const
{
// in case shape has some negative parameters, these has to be computed
// in order to fit the mother
if (!TestBit(kGeoRunTimeShape)) return 0;
if (mother->IsRunTimeShape() || !mother->TestBit(kGeoTrd1)) {
Error("GetMakeRuntimeShape", "invalid mother");
return 0;
}
Double_t dx1, dx2, dy, dz;
if (fDx1<0) dx1=((TGeoTrd1*)mother)->GetDx1();
else dx1=fDx1;
if (fDx2<0) dx2=((TGeoTrd1*)mother)->GetDx2();
else dx2=fDx2;
if (fDy<0) dy=((TGeoTrd1*)mother)->GetDy();
else dy=fDy;
if (fDz<0) dz=((TGeoTrd1*)mother)->GetDz();
else dz=fDz;
return (new TGeoTrd1(dx1, dx2, dy, dz));
}
//-----------------------------------------------------------------------------
void TGeoTrd1::InspectShape() const
{
// print shape parameters
printf("*** TGeoTrd1 parameters ***n");
printf(" dx1 = %11.5fn", fDx1);
printf(" dx2 = %11.5fn", fDx2);
printf(" dy = %11.5fn", fDy);
printf(" dz = %11.5fn", fDz);
TGeoBBox::InspectShape();
}
//-----------------------------------------------------------------------------
void TGeoTrd1::NextCrossing(TGeoParamCurve * /*c*/, Double_t * /*point*/) const
{
// computes next intersection point of curve c with this shape
}
//-----------------------------------------------------------------------------
Double_t TGeoTrd1::Safety(Double_t * /*point*/, Double_t * /*spoint*/, Option_t * /*option*/) const
{
// computes the closest distance from given point to this shape, according
// to option. The matching point on the shape is stored in spoint.
return kBig;
}
//-----------------------------------------------------------------------------
void TGeoTrd1::SetDimensions(Double_t *param)
{
// set trd1 params in one step :
fDx1 = param[0];
fDx2 = param[1];
fDy = param[2];
fDz = param[3];
ComputeBBox();
}
//-----------------------------------------------------------------------------
void TGeoTrd1::SetVertex(Double_t *vertex) const
{
// set vertex of a corner according to visibility flags
if (TestBit(kGeoVisX)) {
if (TestBit(kGeoVisZ)) {
vertex[0] = fDx2;
vertex[2] = fDz;
vertex[1] = (TestBit(kGeoVisY))?fDy:-fDy;
} else {
vertex[0] = fDx1;
vertex[2] = -fDz;
vertex[1] = (TestBit(kGeoVisY))?fDy:-fDy;
}
} else {
if (TestBit(kGeoVisZ)) {
vertex[0] = -fDx2;
vertex[2] = fDz;
vertex[1] = (TestBit(kGeoVisY))?fDy:-fDy;
} else {
vertex[0] = -fDx1;
vertex[2] = -fDz;
vertex[1] = (TestBit(kGeoVisY))?fDy:-fDy;
}
}
}
//-----------------------------------------------------------------------------
void TGeoTrd1::SetPoints(Double_t *buff) const
{
// create arb8 mesh points
if (!buff) return;
buff[ 0] = -fDx1; buff[ 1] = -fDy; buff[ 2] = -fDz;
buff[ 3] = -fDx1; buff[ 4] = fDy; buff[ 5] = -fDz;
buff[ 6] = fDx1; buff[ 7] = fDy; buff[ 8] = -fDz;
buff[ 9] = fDx1; buff[10] = -fDy; buff[11] = -fDz;
buff[12] = -fDx2; buff[13] = -fDy; buff[14] = fDz;
buff[15] = -fDx2; buff[16] = fDy; buff[17] = fDz;
buff[18] = fDx2; buff[19] = fDy; buff[20] = fDz;
buff[21] = fDx2; buff[22] = -fDy; buff[23] = fDz;
}
//-----------------------------------------------------------------------------
void TGeoTrd1::SetPoints(Float_t *buff) const
{
// create arb8 mesh points
if (!buff) return;
buff[ 0] = -fDx1; buff[ 1] = -fDy; buff[ 2] = -fDz;
buff[ 3] = -fDx1; buff[ 4] = fDy; buff[ 5] = -fDz;
buff[ 6] = fDx1; buff[ 7] = fDy; buff[ 8] = -fDz;
buff[ 9] = fDx1; buff[10] = -fDy; buff[11] = -fDz;
buff[12] = -fDx2; buff[13] = -fDy; buff[14] = fDz;
buff[15] = -fDx2; buff[16] = fDy; buff[17] = fDz;
buff[18] = fDx2; buff[19] = fDy; buff[20] = fDz;
buff[21] = fDx2; buff[22] = -fDy; buff[23] = fDz;
}
//-----------------------------------------------------------------------------
void TGeoTrd1::Sizeof3D() const
{
// fill size of this 3-D object
TGeoBBox::Sizeof3D();
}
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