Logo ROOT  
Reference Guide
xtruSamples.C File Reference

Detailed Description

Draw a sample of TXTRU shapes some convex, concave (and possibly malformed)

Change Bool_t's to test alternative specifications

void xtruSamples()
{
// One normally specifies the x-y points in counter-clockwise order;
// flip this to TRUE to test that it doesn't matter.
Bool_t makecw = kFALSE;
// One normally specifies the z points in increasing z order;
// flip this to TRUE to test that it doesn't matter.
Bool_t reversez = kFALSE;
// One shouldn't be creating malformed polygons
// but to test what happens when one does here's a flag.
// The effect will be only apparent in solid rendering mode
Bool_t domalformed = kFALSE;
// domalformed = kTRUE;
TCanvas* c1 = new TCanvas("c1","sample TXTRU Shapes",200,10,640,640);
// Create a new geometry
TGeometry* geom = new TGeometry("sample","sample");
geom->cd();
// Define the complexity of the drawing
Int_t zseg = 6; // either 2 or 6
Int_t extravis = 0; // make extra z "arrow" visible
Float_t unit = 1;
// Create a large BRIK to embed things into
Float_t bigdim = 12.5*unit;
TBRIK* world = new TBRIK("world","world","void",bigdim,bigdim,bigdim);
// Create the main node, make it invisible
TNode* worldnode = new TNode("worldnode","world node",world);
worldnode->SetVisibility(0);
worldnode->cd();
// Canonical shape ... gets further modified by scale factors
// to create convex (and malformed) versions
Float_t x[] = { -0.50, -1.20, 1.20, 0.50, 0.50, 1.20, -1.20, -0.50 };
Float_t y[] = { -0.75, -2.00, -2.00, -0.75, 0.75, 2.00, 2.00, 0.75 };
Float_t z[] = { -0.50, -1.50, -1.50, 1.50, 1.50, 0.50 };
Float_t s[] = { 0.50, 1.00, 1.50, 1.50, 1.00, 0.50 };
Int_t nxy = sizeof(x)/sizeof(Float_t);
Float_t convexscale[] = { 7.0, -1.0, 1.5 };
Int_t icolor[] = { 1, 2, 3, 2, 2, 2, 4, 2, 6 };
// xycase and zcase: 0=convex, 1=malformed, 2=concave
// this will either create a 2x2 matrix of shapes
// or a 3x3 array (if displaying malformed versions)
for (Int_t zcase = 0; zcase<3; zcase++) {
if (zcase == 1 && !domalformed) continue;
for (Int_t xycase = 0; xycase<3; xycase++) {
if (xycase == 1 && !domalformed) continue;
char name[9];
sprintf(name,"txtru%1d%1d%1d",xycase,zcase,zseg);
TXTRU* mytxtru = new TXTRU(name,name,"void",8,2);
Int_t i, j;
Float_t xsign = (makecw) ? -1 : 1;
Float_t zsign = (reversez) ? -1 : 1;
// set the vertex points
for (i=0; i<nxy; i++) {
Float_t xtmp = x[i]*xsign;
Float_t ytmp = y[i];
if (i==0||i==3||i==4||i==7) xtmp *= convexscale[xycase];
if (xycase==2) xtmp *=2;
mytxtru->DefineVertex(i,xtmp,ytmp);
}
// set the z segment positions and scales
for (i=0, j=0; i<zseg; i++) {
Float_t ztmp = z[i]*zsign;
if (i==0||i==5) ztmp *= convexscale[zcase];
if (zcase==2) ztmp *= 2.5;
if (zseg>2 && zcase!=2 && (i==1||i==4)) continue;
mytxtru->DefineSection(j,ztmp,s[i]);
j++;
}
TNode* txtrunode = new TNode(name,name,mytxtru);
txtrunode->SetLineColor(icolor[3*zcase+xycase]);
Float_t pos_scale = (domalformed) ? 10 : 6;
Float_t xpos = (xycase-1)*pos_scale*unit;
Float_t ypos = (zcase-1)*pos_scale*unit;
txtrunode->SetPosition(xpos,ypos,0.);
}
}
// Some extra shapes to show the direction of "z"
Float_t zhalf = 0.5*bigdim;
Float_t rmax = 0.03*bigdim;
TCONE* zcone = new TCONE("zcone","zcone","void",zhalf,0.,rmax,0.,0.);
zcone->SetVisibility(extravis);
TNode* zconenode = new TNode("zconenode","zconenode",zcone);
zconenode->SetLineColor(3);
Float_t dzstub = 2*rmax;
TBRIK* zbrik = new TBRIK("zbrik","zbrik","void",rmax,rmax,dzstub);
zbrik->SetVisibility(extravis);
TNode* zbriknode = new TNode("zbriknode","zbriknode",zbrik);
zbriknode->SetPosition(0.,0.,zhalf+dzstub);
zbriknode->SetLineColor(3);
// geom->ls();
geom->Draw();
// Tweak the pad so that it displays the entire geometry undistorted
TVirtualPad *thisPad = gPad;
if (thisPad) {
TView *view = thisPad->GetView();
if (!view) return;
Double_t min[3],max[3],center[3];
view->GetRange(min,max);
int i;
// Find the boxed center
for (i=0;i<3; i++) center[i] = 0.5*(max[i]+min[i]);
Double_t maxSide = 0;
// Find the largest side
for (i=0;i<3; i++) maxSide = TMath::Max(maxSide,max[i]-center[i]);
file://Adjust scales:
for (i=0;i<3; i++) {
max[i] = center[i] + maxSide;
min[i] = center[i] - maxSide;
}
view->SetRange(min,max);
thisPad->Modified();
thisPad->Update();
}
}
Author
Robert Hatcher (rhatc.nosp@m.her@.nosp@m.fnal..nosp@m.gov) 2000.09.06

Definition in file xtruSamples.C.

TView::SetRange
virtual void SetRange(const Double_t *min, const Double_t *max)=0
TVirtualPad::Update
virtual void Update()=0
TMath::Max
Short_t Max(Short_t a, Short_t b)
Definition: TMathBase.h:212
TGeometry::Draw
virtual void Draw(Option_t *option="")
Draw this Geometry.
Definition: TGeometry.cxx:254
TBRIK
Definition: TBRIK.h:26
TShape::SetVisibility
virtual void SetVisibility(Int_t vis)
Definition: TShape.h:62
Float_t
float Float_t
Definition: RtypesCore.h:57
TGeant4Unit::s
static constexpr double s
Definition: TGeant4SystemOfUnits.h:168
Int_t
int Int_t
Definition: RtypesCore.h:45
x
Double_t x[n]
Definition: legend1.C:17
TGeometry::cd
virtual void cd(const char *path=0)
Change Current Geometry to this.
Definition: TGeometry.cxx:246
TGeometry
Definition: TGeometry.h:39
Bool_t
bool Bool_t
Definition: RtypesCore.h:63
TCONE
Definition: TCONE.h:28
TView
Definition: TView.h:25
TNode::SetVisibility
virtual void SetVisibility(Int_t vis=1)
Set visibility for this node and its sons.
Definition: TNode.cxx:760
kFALSE
const Bool_t kFALSE
Definition: RtypesCore.h:92
TXTRU::DefineSection
virtual void DefineSection(Int_t secNum, Float_t z, Float_t scale=1., Float_t x0=0., Float_t y0=0.)
Set z section iz information expand size of array if necessary.
Definition: TXTRU.cxx:250
TNode::SetPosition
virtual void SetPosition(Double_t x=0, Double_t y=0, Double_t z=0)
Definition: TNode.h:89
y
Double_t y[n]
Definition: legend1.C:17
TVirtualPad::GetView
virtual TView * GetView() const =0
TNode
Definition: TNode.h:33
TView::GetRange
virtual void GetRange(Float_t *min, Float_t *max)=0
Double_t
double Double_t
Definition: RtypesCore.h:59
TVirtualPad
Definition: TVirtualPad.h:50
TXTRU::DefineVertex
virtual void DefineVertex(Int_t pointNum, Float_t x, Float_t y)
Set vertex point ipt to (x,y) expand size of array if necessary.
Definition: TXTRU.cxx:304
TCanvas
Definition: TCanvas.h:23
file
Definition: file.py:1
name
char name[80]
Definition: TGX11.cxx:110
TXTRU
Definition: TXTRU.h:22
TVirtualPad::Modified
virtual void Modified(Bool_t flag=1)=0
gPad
#define gPad
Definition: TVirtualPad.h:287
TNode::cd
virtual void cd(const char *path=0)
Change Current Reference node to this.
Definition: TNode.cxx:251
c1
return c1
Definition: legend1.C:41