    // @(#)root/graf:$Name:  $:$Id: TCurlyArc.cxx,v 1.4 2002/01/24 11:39:28 rdm Exp $
    // Author: Otto Schaile   20/11/99

    /*************************************************************************
     * 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.             *
     *************************************************************************/

    //________________________________________________________________________
    //
    // This class implements curly or wavy arcs typically used to draw Feynman diagrams.
    // Amplitudes and wavelengths may be specified in the constructors,
    // via commands or interactively from popup menus.
    // The class make use of TCurlyLine by inheritance, ExecuteEvent methods
    // are highly inspired from the methods used in TPolyLine and TArc.
    // The picture below has been generated by the tutorial feynman.
    //

/* */ //

//________________________________________________________________________ #include "Riostream.h" #include "TCurlyArc.h" #include "TROOT.h" #include "TVirtualPad.h" #include "TVirtualX.h" #include "TMath.h" ClassImp(TCurlyArc) //_____________________________________________________________________________________ TCurlyArc::TCurlyArc(Double_t x1, Double_t y1, Double_t rad, Double_t phimin, Double_t phimax, Double_t tl, Double_t trad) : fR1(rad), fPhimin(phimin),fPhimax(phimax) { // create a new TCurlyarc with center (x1, y1) and radius rad. // The wavelength and amplitude are given in percent of the line length // phimin and phimax are given in degrees. fX1 = x1; fY1 = y1; fIsCurly = kTRUE; fAmplitude = trad; fWaveLength = tl; fTheta = 0; Build(); } //_____________________________________________________________________________________ void TCurlyArc::Build() { //*-*-*-*-*-*-*-*-*-*-*Create a curly (Gluon) or wavy (Gamma) arc*-*-*-*-*-* //*-* =========================================== Double_t dang = fPhimax - fPhimin; if(dang < 0) dang += 360; Double_t length = TMath::Pi() * fR1 * dang/180; Double_t x1sav = fX1; Double_t y1sav = fY1; fX1 = fY1 = 0; fX2 = length; fY2 = 0; TCurlyLine::Build(); fX1 = x1sav; fY1 = y1sav; Double_t *xv= GetX(); Double_t *yv= GetY(); Double_t xx, yy, angle; for(Int_t i = 0; i < fNsteps; i++){ angle = xv[i] / (fR1) + fPhimin * TMath::Pi()/180; xx = (yv[i] + fR1) * cos(angle); yy = (yv[i] + fR1) * sin(angle); xv[i] = xx + fX1; yv[i] = yy + fY1; } } //______________________________________________________________________________ Int_t TCurlyArc::DistancetoPrimitive(Int_t px, Int_t py) { //*-*-*-*-*-*-*-*-*-*-*Compute distance from point px,py to an arc*-*-*-* //*-* =========================================== // Compute the closest distance of approach from point px,py to this arc. // The distance is computed in pixels units. // //*-*- Compute distance of point to center of arc Int_t pxc = gPad->XtoAbsPixel(fX1); Int_t pyc = gPad->YtoAbsPixel(fY1); Double_t dist = TMath::Sqrt(Double_t((pxc-px)*(pxc-px)+(pyc-py)*(pyc-py))); Double_t cosa = (px - pxc)/dist; Double_t sina = (pyc - py)/dist; Double_t phi = TMath::ATan2(sina,cosa); if(phi < 0) phi += 2 * TMath::Pi(); phi = phi * 180 / TMath::Pi(); if(fPhimax > fPhimin){ if(phi < fPhimin || phi > fPhimax) return 9999; } else { if(phi > fPhimin && phi < fPhimax) return 9999; } Int_t pxr = gPad->XtoAbsPixel(fR1 + gPad->GetUxmin()); Double_t distr = TMath::Abs(dist-pxr); return Int_t(distr); } //______________________________________________________________________________ void TCurlyArc::ExecuteEvent(Int_t event, Int_t px, Int_t py) { //*-*-*-*-*-*-*-*-*-*-*Execute action corresponding to one event*-*-*-* //*-* ========================================= // This member function is called when a TCurlyArc is clicked with the locator // // If Left button clicked on one of the line end points, this point // follows the cursor until button is released. // // if Middle button clicked, the line is moved parallel to itself // until the button is released. // Int_t kMaxDiff = 10; const Int_t np = 10; const Double_t PI = 3.141592; static Int_t x[np+3], y[np+3]; static Int_t px1,py1,npe,R1; static Int_t pxold, pyold; Int_t i, dpx, dpy; Double_t angle,dx,dy,dphi,rTy,rBy,rLx,rRx; Double_t phi0; static Bool_t T, L, R, B, INSIDE; static Int_t Tx,Ty,Lx,Ly,Rx,Ry,Bx,By; switch (event) { case kButton1Down: gVirtualX->SetLineColor(-1); TAttLine::Modify(); dphi = (fPhimax-fPhimin) * PI / 180; if(dphi<0) dphi += 2 * PI; dphi /= np; phi0 = fPhimin * PI / 180; for (i=0;i<=np;i++) { angle = Double_t(i)*dphi + phi0; dx = fR1*TMath::Cos(angle); dy = fR1*TMath::Sin(angle); x[i] = gPad->XtoAbsPixel(fX1 + dx); y[i] = gPad->YtoAbsPixel(fY1 + dy); } if (fPhimax-fPhimin >= 360 ) { x[np+1] = x[0]; y[np+1] = y[0]; npe = np; } else { x[np+1] = gPad->XtoAbsPixel(fX1); y[np+1] = gPad->YtoAbsPixel(fY1); x[np+2] = x[0]; y[np+2] = y[0]; npe = np + 2; } px1 = gPad->XtoAbsPixel(fX1); py1 = gPad->YtoAbsPixel(fY1); Tx = Bx = px1; Ly = Ry = py1; Ty = gPad->YtoAbsPixel( fR1+fY1); By = gPad->YtoAbsPixel(-fR1+fY1); Lx = gPad->XtoAbsPixel(-fR1+fX1); Rx = gPad->XtoAbsPixel( fR1+fX1); R1 = TMath::Abs(By-Ty)/2; gVirtualX->DrawLine(Rx+4, py1+4, Rx-4, py1+4); gVirtualX->DrawLine(Rx-4, py1+4, Rx-4, py1-4); gVirtualX->DrawLine(Rx-4, py1-4, Rx+4, py1-4); gVirtualX->DrawLine(Rx+4, py1-4, Rx+4, py1+4); gVirtualX->DrawLine(Lx+4, py1+4, Lx-4, py1+4); gVirtualX->DrawLine(Lx-4, py1+4, Lx-4, py1-4); gVirtualX->DrawLine(Lx-4, py1-4, Lx+4, py1-4); gVirtualX->DrawLine(Lx+4, py1-4, Lx+4, py1+4); gVirtualX->DrawLine(px1+4, By+4, px1-4, By+4); gVirtualX->DrawLine(px1-4, By+4, px1-4, By-4); gVirtualX->DrawLine(px1-4, By-4, px1+4, By-4); gVirtualX->DrawLine(px1+4, By-4, px1+4, By+4); gVirtualX->DrawLine(px1+4, Ty+4, px1-4, Ty+4); gVirtualX->DrawLine(px1-4, Ty+4, px1-4, Ty-4); gVirtualX->DrawLine(px1-4, Ty-4, px1+4, Ty-4); gVirtualX->DrawLine(px1+4, Ty-4, px1+4, Ty+4); // No break !!! case kMouseMotion: px1 = gPad->XtoAbsPixel(fX1); py1 = gPad->YtoAbsPixel(fY1); Tx = Bx = px1; Ly = Ry = py1; Ty = gPad->YtoAbsPixel(fR1+fY1); By = gPad->YtoAbsPixel(-fR1+fY1); Lx = gPad->XtoAbsPixel(-fR1+fX1); Rx = gPad->XtoAbsPixel(fR1+fX1); T = L = R = B = INSIDE = kFALSE; if ((TMath::Abs(px - Tx) < kMaxDiff) && (TMath::Abs(py - Ty) < kMaxDiff)) { // top edge T = kTRUE; gPad->SetCursor(kTopSide); } else if ((TMath::Abs(px - Bx) < kMaxDiff) && (TMath::Abs(py - By) < kMaxDiff)) { // bottom edge B = kTRUE; gPad->SetCursor(kBottomSide); } else if ((TMath::Abs(py - Ly) < kMaxDiff) && (TMath::Abs(px - Lx) < kMaxDiff)) { // left edge L = kTRUE; gPad->SetCursor(kLeftSide); } else if ((TMath::Abs(py - Ry) < kMaxDiff) && (TMath::Abs(px - Rx) < kMaxDiff)) { // right edge R = kTRUE; gPad->SetCursor(kRightSide); } else {INSIDE= kTRUE; gPad->SetCursor(kMove); } pxold = px; pyold = py; break; case kButton1Motion: gVirtualX->DrawLine(Rx+4, py1+4, Rx-4, py1+4); gVirtualX->DrawLine(Rx-4, py1+4, Rx-4, py1-4); gVirtualX->DrawLine(Rx-4, py1-4, Rx+4, py1-4); gVirtualX->DrawLine(Rx+4, py1-4, Rx+4, py1+4); gVirtualX->DrawLine(Lx+4, py1+4, Lx-4, py1+4); gVirtualX->DrawLine(Lx-4, py1+4, Lx-4, py1-4); gVirtualX->DrawLine(Lx-4, py1-4, Lx+4, py1-4); gVirtualX->DrawLine(Lx+4, py1-4, Lx+4, py1+4); gVirtualX->DrawLine(px1+4, By+4, px1-4, By+4); gVirtualX->DrawLine(px1-4, By+4, px1-4, By-4); gVirtualX->DrawLine(px1-4, By-4, px1+4, By-4); gVirtualX->DrawLine(px1+4, By-4, px1+4, By+4); gVirtualX->DrawLine(px1+4, Ty+4, px1-4, Ty+4); gVirtualX->DrawLine(px1-4, Ty+4, px1-4, Ty-4); gVirtualX->DrawLine(px1-4, Ty-4, px1+4, Ty-4); gVirtualX->DrawLine(px1+4, Ty-4, px1+4, Ty+4); for (i=0;i<npe;i++) gVirtualX->DrawLine(x[i], y[i], x[i+1], y[i+1]); if (T) { R1 -= (py - pyold); } if (B) { R1 += (py - pyold); } if (L) { R1 -= (px - pxold); } if (R) { R1 += (px - pxold); } if (T || B || L || R) { gVirtualX->SetLineColor(-1); TAttLine::Modify(); dphi = (fPhimax-fPhimin) * PI / 180; if(dphi<0) dphi += 2 * PI; dphi /= np; phi0 = fPhimin * PI / 180; Double_t uR1 = gPad->PixeltoX(R1) - gPad->GetUxmin(); Int_t pX1 = gPad->XtoAbsPixel(fX1); Int_t pY1 = gPad->YtoAbsPixel(fY1); for (i=0;i<=np;i++) { angle = Double_t(i)*dphi + phi0; dx = uR1 * TMath::Cos(angle); dy = uR1 * TMath::Sin(angle); x[i] = gPad->XtoAbsPixel(fX1 + dx); y[i] = gPad->YtoAbsPixel(fY1 + dy); } if (fPhimax-fPhimin >= 360 ) { x[np+1] = x[0]; y[np+1] = y[0]; npe = np; } else { x[np+1] = pX1; y[np+1] = pY1; x[np+2] = x[0]; y[np+2] = y[0]; npe = np + 2; } for (i=0;i<npe;i++) { gVirtualX->DrawLine(x[i], y[i], x[i+1], y[i+1]); } } if (INSIDE) { dpx = px-pxold; dpy = py-pyold; px1 += dpx; py1 += dpy; for (i=0;i<=npe;i++) { x[i] += dpx; y[i] += dpy;} for (i=0;i<npe;i++) gVirtualX->DrawLine(x[i], y[i], x[i+1], y[i+1]); } Tx = Bx = px1; Rx = px1+R1; Lx = px1-R1; Ry = Ly = py1; Ty = py1-R1; By = py1+R1; gVirtualX->DrawLine(Rx+4, py1+4, Rx-4, py1+4); gVirtualX->DrawLine(Rx-4, py1+4, Rx-4, py1-4); gVirtualX->DrawLine(Rx-4, py1-4, Rx+4, py1-4); gVirtualX->DrawLine(Rx+4, py1-4, Rx+4, py1+4); gVirtualX->DrawLine(Lx+4, py1+4, Lx-4, py1+4); gVirtualX->DrawLine(Lx-4, py1+4, Lx-4, py1-4); gVirtualX->DrawLine(Lx-4, py1-4, Lx+4, py1-4); gVirtualX->DrawLine(Lx+4, py1-4, Lx+4, py1+4); gVirtualX->DrawLine(px1+4, By+4, px1-4, By+4); gVirtualX->DrawLine(px1-4, By+4, px1-4, By-4); gVirtualX->DrawLine(px1-4, By-4, px1+4, By-4); gVirtualX->DrawLine(px1+4, By-4, px1+4, By+4); gVirtualX->DrawLine(px1+4, Ty+4, px1-4, Ty+4); gVirtualX->DrawLine(px1-4, Ty+4, px1-4, Ty-4); gVirtualX->DrawLine(px1-4, Ty-4, px1+4, Ty-4); gVirtualX->DrawLine(px1+4, Ty-4, px1+4, Ty+4); pxold = px; pyold = py; break; case kButton1Up: fX1 = gPad->AbsPixeltoX(px1); fY1 = gPad->AbsPixeltoY(py1); rBy = gPad->AbsPixeltoY(py1+R1); rTy = gPad->AbsPixeltoY(py1-R1); rLx = gPad->AbsPixeltoX(px1+R1); rRx = gPad->AbsPixeltoX(px1-R1); fR1 = TMath::Abs(rRx-rLx)/2; fR1 = TMath::Abs(rTy-rBy)/2; Build(); gPad->Modified(kTRUE); gVirtualX->SetLineColor(-1); } } //_____________________________________________________________________________________ void TCurlyArc::SavePrimitive(ofstream &out, Option_t *){ // Save primitive as a C++ statement(s) on output stream out if (gROOT->ClassSaved(TCurlyArc::Class())) { out<<" "; } else { out<<" TCurlyArc *"; } out<<"curlyarc = new TCurlyArc(" <<fX1<<","<<fY1<<","<<fR1<<","<<fPhimin<<","<<fPhimax<<"," <<fWaveLength<<","<<fAmplitude<<");"<<endl; if (!fIsCurly) { out<<" curlyarc->SetWavy();"<<endl; } SaveLineAttributes(out,"curlyarc",1,1,1); out<<" curlyarc->Draw();"<<endl; } //_____________________________________________________________________________________ void TCurlyArc::SetCenter(Double_t x, Double_t y) { fX1 = x; fY1 = y; Build(); } void TCurlyArc::SetRadius(Double_t x) { fR1 = x; Build(); } void TCurlyArc::SetPhimin(Double_t x) { fPhimin = x; Build(); } void TCurlyArc::SetPhimax(Double_t x) { fPhimax = x; Build(); }