Revision 8c49506593ec98a48775b3771f3b537a1b974c45 authored by Timur Pocheptsov on 26 March 2014, 16:41:21 UTC, committed by Timur Pocheptsov on 26 March 2014, 16:41:21 UTC
1 parent 6fbc5a9
transp.C
//This demo shows how to use transparency.
//Includes for ACLiC (cling does not need them).
#include "TVirtualX.h"
#include "TCanvas.h"
#include "Rtypes.h"
#include "TColor.h"
#include "TError.h"
#include "TH1F.h"
//Aux. functions for tutorials/gl.
#include "customcolorgl.h"
void transp()
{
//1. Try to find free indices for our custom colors.
//We can use hard-coded indices like 1001, 1002, 1003, ... but
//I prefer to find free indices in a ROOT's color table
//to avoid possible conflicts with other tutorials.
Int_t indices[2] = {};
if (ROOT::GLTutorials::FindFreeCustomColorIndices(indices) != 2) {
Error("transp", "failed to create new custom colors");
return;
}
//2. Now that we have indices, create our custom colors.
const Int_t redIndex = indices[0], greeIndex = indices[1];
new TColor(redIndex, 1., 0., 0., "red", 0.85);
new TColor(greeIndex, 0., 1., 0., "green", 0.5);
gStyle->SetCanvasPreferGL(kTRUE);
TCanvas * const cnv = new TCanvas("trasnparency", "transparency demo", 600, 400);
TH1F * hist = new TH1F("a5", "b5", 10, -2., 3.);
TH1F * hist2 = new TH1F("c6", "d6", 10, -3., 3.);
hist->FillRandom("landau", 100000);
hist2->FillRandom("gaus", 100000);
hist->SetFillColor(redIndex);
hist2->SetFillColor(greeIndex);
cnv->cd();
hist2->Draw();
hist->Draw("SAME");
}
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