TMarker.cxx

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// @(#)root/graf:$Id$
// Author: Rene Brun   12/05/95
 
/*************************************************************************
 * 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 <cstdlib>
#include <iostream>
 
#include "TROOT.h"
#include "TBuffer.h"
#include "TVirtualPad.h"
#include "TMarker.h"
#include "TVirtualX.h"
#include "TMath.h"
#include "TPoint.h"
#include "TText.h"
#include "snprintf.h"
 
ClassImp(TMarker);
 
 
/** \class TMarker
\ingroup BasicGraphics
 
Manages Markers.
 
Use the TMarker constructor to create a marker.
 
~~~ {.cpp}
   TMarker(Double_t x,Double_t y,Int_t marker)
~~~
 
The parameters `x` and `y` are the marker coordinates and `marker` is the marker type.
 
Use the TPolyMarker to create an array on N points in a 2D space.
At each point `x[i]`, `y[i]` a marker is drawn.
 
Use the TAttMarker class to change the attributes color, style and size of a marker.
 
_**Example**_
 
- Use the `TAttMarker::SetMarkerSize(size)` method to set the `size` of a marker.
 
*/
 
////////////////////////////////////////////////////////////////////////////////
/// Marker default constructor.
 
TMarker::TMarker(): TObject(), TAttMarker()
{
   fX = 0;
   fY = 0;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Marker normal constructor.
 
TMarker::TMarker(Double_t x, Double_t y, Int_t marker)
      :TObject(), TAttMarker()
{
   fX = x;
   fY = y;
   fMarkerStyle = marker;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Marker default destructor.
 
TMarker::~TMarker()
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// Marker copy constructor.
 
TMarker::TMarker(const TMarker &marker) : TObject(marker), TAttMarker(marker), TAttBBox2D(marker)
{
   fX = 0;
   fY = 0;
   marker.TMarker::Copy(*this);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Copy this marker to marker.
 
void TMarker::Copy(TObject &obj) const
{
   TObject::Copy(obj);
   TAttMarker::Copy(((TMarker &)obj));
   ((TMarker &)obj).fX = fX;
   ((TMarker &)obj).fY = fY;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Display the table of markers with their numbers.
 
void TMarker::DisplayMarkerTypes()
{
   TMarker marker;
   TText text;
   marker.SetMarkerSize(3);
   text.SetTextFont(62);
   text.SetTextAlign(22);
   text.SetTextSize(0.1);
   TString atext;
   Double_t x = 0;
   Double_t dx = 1/16.0;
   for (Int_t i=1;i<16;i++) {
      x += dx;
      atext.Form("%d",i);
      marker.SetMarkerStyle(i);
      marker.DrawMarker(x,.25);
      text.DrawText(x,.12,atext.Data());
      atext.Form("%d",i+19);
      marker.SetMarkerStyle(i+19);
      marker.DrawMarker(x,.55);
      text.DrawText(x,.42,atext.Data());
      atext.Form("%d",i+34);
      marker.SetMarkerStyle(i+34);
      marker.DrawMarker(x,.85);
      text.DrawText(x,.72,atext.Data());
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Display the table of markers with different line widths and their numbers.
 
void TMarker::DisplayMarkerLineWidths()
{
   TMarker marker;
   TText text;
   marker.SetMarkerSize(3);
   text.SetTextFont(62);
   text.SetTextAlign(22);
   text.SetTextSize(0.075);
   TString atext;
   Double_t x = 0;
   Double_t dx = 1/19.0;
   for (Int_t i=1;i<19;i++) {
      x += dx;
      atext.Form("%d",i+49);
      marker.SetMarkerStyle(i+49);
      marker.DrawMarker(x,0.19);
      text.DrawText(x,0.08,atext.Data());
      atext.Form("%d",i+67);
      marker.SetMarkerStyle(i+67);
      marker.DrawMarker(x,0.42);
      text.DrawText(x,0.31,atext.Data());
      atext.Form("%d",i+85);
      marker.SetMarkerStyle(i+85);
      marker.DrawMarker(x,0.65);
      text.DrawText(x,0.54,atext.Data());
      atext.Form("%d",i+103);
      marker.SetMarkerStyle(i+103);
      marker.DrawMarker(x,0.88);
      text.DrawText(x,0.77,atext.Data());
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Compute distance from point px,py to a marker.
///
///  Compute the closest distance of approach from point px,py to this marker.
///  The distance is computed in pixels units.
 
Int_t TMarker::DistancetoPrimitive(Int_t px, Int_t py)
{
   Int_t pxm, pym;
   if (TestBit(kMarkerNDC)) {
      pxm = gPad->UtoPixel(fX);
      pym = gPad->VtoPixel(fY);
   } else {
      pxm  = gPad->XtoAbsPixel(gPad->XtoPad(fX));
      pym  = gPad->YtoAbsPixel(gPad->YtoPad(fY));
   }
   Int_t dist = (Int_t)TMath::Sqrt((px-pxm)*(px-pxm) + (py-pym)*(py-pym));
 
   //marker size = 1 is about 8 pixels
   Int_t markerRadius = Int_t(4*fMarkerSize);
   if (dist <= markerRadius)   return 0;
   if (dist >  markerRadius+3) return 999;
   return dist;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Draw this marker with its current attributes.
 
void TMarker::Draw(Option_t *option)
{
   AppendPad(option);
 
}
 
////////////////////////////////////////////////////////////////////////////////
/// Draw this marker with new coordinates.
 
TMarker *TMarker::DrawMarker(Double_t x, Double_t y)
{
   TMarker *newmarker = new TMarker(x, y, 1);
   TAttMarker::Copy(*newmarker);
   newmarker->SetBit(kCanDelete);
   newmarker->AppendPad();
   return newmarker;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Execute action corresponding to one event.
///
///  This member function is called when a marker is clicked with the locator
///
///  If Left button is clicked on a marker, the marker is moved to
///  a new position when the mouse button is released.
 
void TMarker::ExecuteEvent(Int_t event, Int_t px, Int_t py)
{
   if (!gPad) return;
 
   TPoint p;
   static Int_t pxold, pyold;
   static Bool_t ndcsav;
   Double_t dpx, dpy, xp1,yp1;
   Bool_t opaque  = gPad->OpaqueMoving();
 
   if (!gPad->IsEditable()) return;
 
   switch (event) {
 
   case kButton1Down:
      ndcsav = TestBit(kMarkerNDC);
      if (!opaque) {
         gVirtualX->SetTextColor(-1);  // invalidate current text color (use xor mode)
         TAttMarker::Modify();  //Change marker attributes only if necessary
      }
      // No break !!!
 
   case kMouseMotion:
      pxold = px;  pyold = py;
      gPad->SetCursor(kMove);
      break;
 
   case kButton1Motion:
      p.fX = pxold; p.fY = pyold;
      if (!opaque) gVirtualX->DrawPolyMarker(1, &p);
      p.fX = px; p.fY = py;
      if (!opaque) gVirtualX->DrawPolyMarker(1, &p);
      pxold = px;  pyold = py;
      if (opaque) {
         if (ndcsav) this->SetNDC(kFALSE);
         this->SetX(gPad->PadtoX(gPad->AbsPixeltoX(px)));
         this->SetY(gPad->PadtoY(gPad->AbsPixeltoY(py)));
         gPad->ShowGuidelines(this, event, 'i', true);
         gPad->Modified(kTRUE);
         gPad->Update();
      }
      break;
 
   case kButton1Up:
      if (opaque) {
         if (ndcsav && !this->TestBit(kMarkerNDC)) {
            this->SetX((fX - gPad->GetX1())/(gPad->GetX2()-gPad->GetX1()));
            this->SetY((fY - gPad->GetY1())/(gPad->GetY2()-gPad->GetY1()));
            this->SetNDC();
         }
         gPad->ShowGuidelines(this, event);
      } else {
         if (TestBit(kMarkerNDC)) {
            dpx  = gPad->GetX2() - gPad->GetX1();
            dpy  = gPad->GetY2() - gPad->GetY1();
            xp1  = gPad->GetX1();
            yp1  = gPad->GetY1();
            fX = (gPad->AbsPixeltoX(pxold)-xp1)/dpx;
            fY = (gPad->AbsPixeltoY(pyold)-yp1)/dpy;
         } else {
            fX = gPad->PadtoX(gPad->AbsPixeltoX(px));
            fY = gPad->PadtoY(gPad->AbsPixeltoY(py));
         }
         gPad->Modified(kTRUE);
         gPad->Update();
         gVirtualX->SetTextColor(-1);
      }
      break;
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// List this marker with its attributes.
 
void TMarker::ls(Option_t *) const
{
   TROOT::IndentLevel();
   printf("Marker  X=%f Y=%f marker type=%d\n",fX,fY,fMarkerStyle);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Paint this marker with its current attributes.
 
void TMarker::Paint(Option_t *)
{
   if (!gPad) return;
   if (TestBit(kMarkerNDC)) {
      Double_t u = gPad->GetX1() + fX*(gPad->GetX2()-gPad->GetX1());
      Double_t v = gPad->GetY1() + fY*(gPad->GetY2()-gPad->GetY1());
      PaintMarker(u,v);
   } else {
      PaintMarker(gPad->XtoPad(fX),gPad->YtoPad(fY));
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Draw this marker with new coordinates.
 
void TMarker::PaintMarker(Double_t x, Double_t y)
{
   TAttMarker::Modify();  //Change line attributes only if necessary
   if (gPad) gPad->PaintPolyMarker(-1,&x,&y,"");
}
 
////////////////////////////////////////////////////////////////////////////////
/// Draw this marker with new coordinates in NDC.
 
void TMarker::PaintMarkerNDC(Double_t, Double_t)
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// Dump this marker with its attributes.
 
void TMarker::Print(Option_t *) const
{
   printf("Marker  X=%f Y=%f",fX,fY);
   if (GetMarkerColor() != 1) printf(" Color=%d",GetMarkerColor());
   if (GetMarkerStyle() != 1) printf(" MarkerStyle=%d",GetMarkerStyle());
   if (GetMarkerSize()  != 1) printf(" MarkerSize=%f",GetMarkerSize());
   printf("\n");
}
 
////////////////////////////////////////////////////////////////////////////////
/// Save primitive as a C++ statement(s) on output stream out
 
void TMarker::SavePrimitive(std::ostream &out, Option_t * /*= ""*/)
{
   if (gROOT->ClassSaved(TMarker::Class())) {
      out<<"   ";
   } else {
      out<<"   TMarker *";
   }
   out<<"marker = new TMarker("<<fX<<","<<fY<<","<<fMarkerStyle<<");"<<std::endl;
 
   SaveMarkerAttributes(out,"marker",1,1,1);
 
   out<<"   marker->Draw();"<<std::endl;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set NDC mode on if isNDC = kTRUE, off otherwise
 
void TMarker::SetNDC(Bool_t isNDC)
{
   ResetBit(kMarkerNDC);
   if (isNDC) SetBit(kMarkerNDC);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Stream an object of class TMarker.
 
void TMarker::Streamer(TBuffer &R__b)
{
   if (R__b.IsReading()) {
      UInt_t R__s, R__c;
      Version_t R__v = R__b.ReadVersion(&R__s, &R__c);
      if (R__v > 1) {
         R__b.ReadClassBuffer(TMarker::Class(), this, R__v, R__s, R__c);
         return;
      }
      //====process old versions before automatic schema evolution
      TObject::Streamer(R__b);
      TAttMarker::Streamer(R__b);
      Float_t x,y;
      R__b >> x;  fX = x;
      R__b >> y;  fY = y;
      //====end of old versions
 
   } else {
      R__b.WriteClassBuffer(TMarker::Class(),this);
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return the bounding Box of the Line
 
Rectangle_t TMarker::GetBBox()
{
   Double_t size = this->GetMarkerSize();
 
   Rectangle_t BBox;
   BBox.fX = gPad->XtoPixel(fX)+(Int_t)(2*size);
   BBox.fY = gPad->YtoPixel(fY)-(Int_t)(2*size);
   BBox.fWidth = 2*size;
   BBox.fHeight = 2*size;
   return (BBox);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return the center of the BoundingBox as TPoint in pixels
 
TPoint TMarker::GetBBoxCenter()
{
   TPoint p;
   if (!gPad) return (p);
   p.SetX(gPad->XtoPixel(fX));
   p.SetY(gPad->YtoPixel(fY));
   return(p);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set center of the BoundingBox
 
void TMarker::SetBBoxCenter(const TPoint &p)
{
   if (!gPad) return;
   fX = gPad->PixeltoX(p.GetX());
   fY = gPad->PixeltoY(p.GetY() - gPad->VtoPixel(0));
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set X coordinate of the center of the BoundingBox
 
void TMarker::SetBBoxCenterX(const Int_t x)
{
   if (!gPad) return;
   fX = gPad->PixeltoX(x);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set Y coordinate of the center of the BoundingBox
 
void TMarker::SetBBoxCenterY(const Int_t y)
{
   if (!gPad) return;
   fY = gPad->PixeltoY(y - gPad->VtoPixel(0));
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set left hand side of BoundingBox to a value
/// (resize in x direction on left)
 
void TMarker::SetBBoxX1(const Int_t x)
{
   if (!gPad) return;
   Double_t size = this->GetMarkerSize();
   fX = gPad->PixeltoX(x + (Int_t)size);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set right hand side of BoundingBox to a value
/// (resize in x direction on right)
 
void TMarker::SetBBoxX2(const Int_t x)
{
   if (!gPad) return;
   Double_t size = this->GetMarkerSize();
   fX = gPad->PixeltoX(x - (Int_t)size);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set top of BoundingBox to a value (resize in y direction on top)
 
void TMarker::SetBBoxY1(const Int_t y)
{
   if (!gPad) return;
   Double_t size = this->GetMarkerSize();
   fY = gPad->PixeltoY(y - (Int_t)size - gPad->VtoPixel(0));
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set bottom of BoundingBox to a value
/// (resize in y direction on bottom)
 
void TMarker::SetBBoxY2(const Int_t y)
{
   if (!gPad) return;
   Double_t size = this->GetMarkerSize();
   fY = gPad->PixeltoY(y + (Int_t)size - gPad->VtoPixel(0));
}