What is the trick for compiling ROOT gui applications with g++? I have no problems compiling ROOT code but when I attempt to compile and link a GUI app I get errors like:
[quote]/./example.cpp:24: undefined reference to TGMainFrame::TGMainFrame(TGWindow const*, unsigned int, unsigned int, unsigned int)' /./example.cpp:26: undefined reference toTGFrame::GetDefaultFrameBackground()’
/./example.cpp:26: undefined reference to `TRootEmbeddedCanvas::TRootEmbeddedCanvas(char const*, TGWindow const*, unsigned int, unsigned int, unsigned int, unsigned long)’
[/quote]
In this case, I’m trying to compile the GUI example from the user’s guide with a main() added.
[code]// example.C
#include <TGClient.h>
#include <TCanvas.h>
#include <TF1.h>
#include <TRandom.h>
#include <TGButton.h>
#include <TGFrame.h>
#include <TRootEmbeddedCanvas.h>
#include <RQ_OBJECT.h>
class MyMainFrame {
RQ_OBJECT(“MyMainFrame”)
private:
TGMainFrame *fMain;
TRootEmbeddedCanvas *fEcanvas;
public:
MyMainFrame(const TGWindow *p,UInt_t w,UInt_t h);
virtual ~MyMainFrame();
void DoDraw();
};
MyMainFrame::MyMainFrame(const TGWindow *p,UInt_t w,UInt_t h) {
// Create a main frame
fMain = new TGMainFrame(p,w,h);
// Create canvas widget
fEcanvas = new TRootEmbeddedCanvas(“Ecanvas”,fMain,200,200);
fMain->AddFrame(fEcanvas, new TGLayoutHints(kLHintsExpandX| kLHintsExpandY,
10,10,10,1));
// Create a horizontal frame widget with buttons
TGHorizontalFrame *hframe = new TGHorizontalFrame(fMain,200,40);
TGTextButton *draw = new TGTextButton(hframe,"&Draw");
draw->Connect(“Clicked()”,“MyMainFrame”,this,“DoDraw()”);
hframe->AddFrame(draw, new TGLayoutHints(kLHintsCenterX,5,5,3,4));
TGTextButton *exit = new TGTextButton(hframe,"&Exit",
“gApplication->Terminate(0)”);
hframe->AddFrame(exit, new TGLayoutHints(kLHintsCenterX,5,5,3,4));
fMain->AddFrame(hframe, new TGLayoutHints(kLHintsCenterX,2,2,2,2));
// Set a name to the main frame
fMain->SetWindowName(“Simple Example”);
// Map all subwindows of main frame
fMain->MapSubwindows();
// Initialize the layout algorithm
fMain->Resize(fMain->GetDefaultSize());
// Map main frame
fMain->MapWindow();
}
void MyMainFrame::DoDraw() {
// Draws function graphics in randomly choosen interval
TF1 *f1 = new TF1(“f1”,“sin(x)/x”,0,gRandom->Rndm()*10);
f1->SetFillColor(19);
f1->SetFillStyle(1);
f1->SetLineWidth(3);
f1->Draw();
TCanvas *fCanvas = fEcanvas->GetCanvas();
fCanvas->cd();
fCanvas->Update();
}
MyMainFrame::~MyMainFrame() {
// Clean up used widgets: frames, buttons, layouthints
fMain->Cleanup();
delete fMain;
}
void example() {
// Popup the GUI…
new MyMainFrame(gClient->GetRoot(),200,200);
}
int main(int argc, char *argv[]){
// Popup the GUI…
new MyMainFrame(gClient->GetRoot(),200,200);
}
[/code]
Thanks for any help you can provide.
