Hi Mike,
In the following macro, I show two examples.
Rene Brun
{
gROOT->Reset();
//method1. compute ymax to get a commensurate range
// 1 pixel must correspond to the same range in x and y
TCanvas c1("c1","c1",10,10,800,600);
Float_t xmin = 0;
Float_t xmax = 20;
Float_t ymin = -2;
Int_t npx = gPad->GetWw();
Int_t npy = gPad->GetWh();
Float_t ymax = ymin + (xmax-xmin)*npy/npx;
TH2F h("h","",20,xmin,xmax,20,ymin,ymax);
h.Draw();
TArc a1(6,4,6);
a1.Draw();
//method2. set a square virtual canvas size in a non-square canvas
TCanvas c2("c2","c2",200,50,800,600);
c2.SetCanvasSize(700,700);
c2.DrawFrame(0,0,20,20);
TArc a2(10,10,10);
a2.Draw();
}
On 14 Jan 2000, Mike Miller wrote:
> >>>>> "Rene" == Rene Brun <Rene.Brun@cern.ch> writes:
>
> > Hi Mike, Could you clarify what you want ? In TH1 and
> > derived classes, you can specify an array of bin positions
> > if you like (default being equidistant bins).
>
> > Mike Miller wrote:
> >> Is there an option that can be set so that 2d histograms
> >> are drawn with commensurate axes?
>
> This is not a question of defining the histogram, but of how it
> is displayed on a canvas. I'd like to automate things so that
> h.Draw() gives me a plot on a canvas such that the horizontal and
> vertical scales are commensurate. For example, if my histogram
> is defined like as TH2F("hist","",10,0,10,20,0.0,20.0) when it is
> plotted on the canvas, the horizontal size will be half that of
> the vertical size. So I guess my question is really about how to
> specify the size of a histogram when it is drawn on a canvas?
>
> Mike
>
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