gui_simple.py

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## \file
## \ingroup tutorial_gui
## A Simple GUI Example
##
## \macro_code
##
## \author Wim Lavrijsen
 
import ROOT
 
 
def pygaus(x, par):
    import math
 
    if par[2] != 0.0:
        arg1 = (x[0] - par[1]) / par[2]
        arg2 = (0.01 * 0.39894228) / par[2]
        arg3 = par[0] / (1 + par[3])
 
        gauss = arg3 * arg2 * math.exp(-0.5 * arg1 * arg1)
    else:
        print("returning 0")
        gauss = 0.0
    return gauss
 
 
tpygaus = ROOT.TF1("pygaus", pygaus, -4, 4, 4)
tpygaus.SetParameters(1.0, 0.0, 1.0)
 
 
def MyDraw():
    btn = ROOT.BindObject(ROOT.gTQSender, ROOT.TGTextButton)
    if btn.WidgetId() == 10:
        global tpygaus, window
        tpygaus.Draw()
        ROOT.gPad.Update()
 
 
class pMainFrame(ROOT.TGMainFrame):
    def __init__(self, parent, width, height):
        ROOT.TGMainFrame.__init__(self, parent, width, height)
 
        self.Canvas = ROOT.TRootEmbeddedCanvas("Canvas", self, 200, 200)
        self.AddFrame(self.Canvas, ROOT.TGLayoutHints(ROOT.kLHintsExpandX | ROOT.kLHintsExpandY))
        self.ButtonsFrame = ROOT.TGHorizontalFrame(self, 200, 40)
 
        self.DrawButton = ROOT.TGTextButton(self.ButtonsFrame, "&Draw", 10)
        self.DrawButton.Connect("Clicked()", MyDraw)
        self.ButtonsFrame.AddFrame(self.DrawButton, ROOT.TGLayoutHints())
 
        self.ExitButton = ROOT.TGTextButton(self.ButtonsFrame, "&Exit", 20)
        self.ExitButton.SetCommand('TPython::Exec( "raise SystemExit" )')
        self.ButtonsFrame.AddFrame(self.ExitButton, ROOT.TGLayoutHints())
 
        self.AddFrame(self.ButtonsFrame, ROOT.TGLayoutHints())
 
        self.SetWindowName("My first GUI")
        self.MapSubwindows()
        self.Resize(self.GetDefaultSize())
        self.MapWindow()
 
    def __del__(self):
        self.Cleanup()
 
 
if __name__ == "__main__":
    window = pMainFrame(ROOT.gClient.GetRoot(), 200, 200)