Detailed Description

Reimplementation of TCanvas. Adds different actions for mouse clicks:

single click: stores position (only for TLevelScheme).
double click: add GMarker if the last histogram found in the gPad is 1D or 2D.
shift click: draw the parent of GH1D histogram on new canvas or draw all histograms on a new canvas, or (for 2D histograms) create new GH2D from histogram and draw it on a new canvas (using "colz").
control click: doesn't do anything right now, code for TCutG is commented out.

For TLevelSchemes we also have:

mouse wheel to change zoom level
mouse drag to zoom in
u unzooms.

Also adds keyboard controls for 1D histograms:

left/right arrow moves the range left/right by 50%.
up/down arrow on GH1D histograms selects the next/previous histogram and draws it.
F2 opens editor.
F9 shows crosshairs.
b Set the background, how it is set depends on B.
B Cycle through types of automatic background subtraction used when projecting with p. Current types include: No subtraction, Fraction of the total, subtract gate from the 3rd marker (gate size set to the distance between marker 1 and 2).
d Open popup.
e Expand the x-axis range between the last two markers.
E Bring up dialogue box used to set desired x-axis range.
f If markers have been set, do a GPeak fit between last two markers on the last histogram (skewed gaus for gamma-rays with automatic bg).
F TPeak Fit (skewed gaus for gamma-rays with automatic bg).
g Simple Gaus fit between the last to marks, displays results of the fit RESULTS STILL NEED TO BE VERIFIED
i Raw integral of counts between the two markers
I TODO: Background subtracted integral of counts between the two markers
l/y Toggle y-axis from linear to logarithmic and vice versa.
m Toggle on marker mode; when on, the histogram will remember and display the last four clicks as marks on the histogram.
M Toggle off marker mode.
n Remove all markers / functions drawn on the histogram.
N Remove all markers and the LAST function drawn on the histogram.
o/u Unzoom the entire histogram.
p If the 1d hist was made using the global ProjectionX/ProjectionY; gating the original 2D matrix this histogram came from is possible by placing markers around the gate and pressing p. The gates spectra is immediately drawn.
P Draws parent histogram???
q If markers have been set, fit a GPeak between the last two markers on the first histogram (skewed gaus for gamma-rays with automatic bg).
r Expand the y-axis range between the last two markers.
R Bring up the dialogue box used to set the desired y-axis range.
s Show peak values.
S Remove peak values.

And for 2D histograms these keyboard controls are added:

left/right arrow moves the range left/right by 50%.
up/down arrow moves the range up/down by 50%.
c Add the initialized cut to the list of cuts (see i).
e Expand the x- and y-axis between the last two markers.
E Bring up dialogue box used to set desired x-axis range.
g Create a cut from the last two markers and add it to the histogram.
i Initialize a new cut.
l/z Toggle z-axis from linear to logarithmic and vice versa.
n Remove all markers / functions drawn on the histogram.
o/u Unzoom the entire histogram.
P Get projections from this histogram and draw the first one if it exists.
r Expand the y-axis between the last two markers.
R Bring up the dialogue box to set the desired y-axis range.
s Save the cuts that have been created.
x Create projection of the histogram onto the x-axis and draw in a new canvas.
X Create "y summary" of the histogram, i.e. a projection of the first y-bin onto the x-axis that yields a non-empty histogram and draw it on a new canvas.
y Create projection of the histogram onto the x-axis and draw in a new canvas.
Y Create "x summary" of the histogram, i.e. a projection of the first x-bin onto the y-axis that yields a non-empty histogram and draw it on a new canvas.

Definition at line 238 of file GCanvas.h.

Public Member Functions
	GCanvas (Bool_t build=kTRUE)

	GCanvas (const char name, const char title, Int_t winw, Int_t winh)

	GCanvas (const char name, const char title, Int_t wtopx, Int_t wtopy, Int_t winw, Int_t winh, bool gui=false)

	GCanvas (const char name, const char title="", Int_t form=1)

	GCanvas (const char *name, Int_t winw, Int_t winh, Int_t winid)

	GCanvas (const GCanvas &)=delete

	GCanvas (GCanvas &&) noexcept=delete

	~GCanvas ()

void	Draw (Option_t *opt="") override

Int_t	GetNMarkers ()

bool	HandleArrowKeyPress (Event_t event, const UInt_t keysym)

void	HandleInput (int event, Int_t x, Int_t y)

bool	HandleKeyboardPress (Event_t event, const UInt_t keysym)

bool	HandleMouseControlPress (Int_t event, Int_t x, Int_t y)

bool	HandleMousePress (Int_t event, Int_t x, Int_t y)

bool	HandleMouseShiftPress (Int_t event, Int_t x, Int_t y)

bool	HandleWheel (Int_t event, Int_t x, Int_t y)

GCanvas &	operator= (const GCanvas &)=delete

GCanvas &	operator= (GCanvas &&) noexcept=delete

void	SetMarkerMode (bool flag=true)

bool	StorePosition (Int_t event, Int_t x, Int_t y)

bool	Zoom (Int_t event, Int_t x, Int_t y)

Static Public Member Functions
static TF1 *	GetLastFit ()

static GCanvas *	MakeDefCanvas ()

Private Member Functions
void	AddMarker (int, int, TH1 *hist)

bool	CycleBackgroundSubtraction ()

void	GCanvasInit ()

void	OrderMarkers ()

bool	Process1DArrowKeyPress (Event_t event, const UInt_t keysym)

bool	Process1DKeyboardPress (Event_t event, const UInt_t keysym)

bool	Process1DMousePress (Int_t event, Int_t x, Int_t y)

bool	Process2DArrowKeyPress (Event_t event, const UInt_t keysym)

bool	Process2DKeyboardPress (Event_t event, const UInt_t keysym)

bool	Process2DMousePress (Int_t event, Int_t x, Int_t y)

bool	ProcessNonHistKeyboardPress (Event_t event, const UInt_t keysym)

void	RedrawMarkers ()

void	RemoveMarker (Option_t *opt="")

bool	SetBackgroundMarkers ()

void	UpdateStatsInfo (int, int)

Static Private Member Functions
static std::vector< TH1 * >	FindAllHists ()

static std::vector< TH1 * >	FindHists (int dim=1)

Private Attributes
std::vector< GMarker * >	fBackgroundMarkers

EBackgroundSubtraction	fBackgroundMode = EBackgroundSubtraction::kNoBackground

char *	fCutName {nullptr}

std::vector< TCutG * >	fCuts

bool	fGuiEnabled {false}

bool	fMarkerMode {false}

std::vector< GMarker * >	fMarkers

TRootCanvas *	fRootCanvas {nullptr}