To draw Mathematical Formula.

TLatex's purpose is to write mathematical equations. The syntax is very similar to the Latex's one. It provides several functionalities:

Subscripts and Superscripts
Fractions
Splitting Lines
Roots
Mathematical Symbols
Delimiters
Greek Letters
Accents
Changing Style
Alignment Rules
Character Adjustment
Italic and Boldface
Examples
Interface to TMathText

When the font precision (see TAttText) is low (0 or 1), TLatex is painted as a normal TText, the control characters are not interpreted.

Subscripts and Superscripts

Subscripts and superscripts are made with the _ and ^ commands. These commands can be combined to make complicated subscript and superscript expressions. You may adjust the display of subscripts and superscripts by using the two functions SetIndiceSize(Double_t), which set relative size of subscripts and superscripts, and SetLimitIndiceSize(Int_t), which set limits for text resizing of subscripts and superscripts.

Examples:

The best way to put the subscripts and superscripts before the character and not after, is to use an empty character:

The subscripts and superscripts operators apply not only on one character but on all the "normal text" preceding them. In the following example the second E is lower than the first one because the operator _ is applied on /f which has a descending part, and not only on f which as no descending part.

To make sure the second operator _ applies only on f a dummy operator ^{} should be introduced to separate the f from the /.

Fractions

Fractions denoted by the / symbol are made in the obvious way. The #frac command is used for large fractions in displayed formula; it has two arguments: the numerator and the denominator.

Examples:

Splitting Lines

Text can be split in two lines via the command splitline.

Examples:

Roots

The sqrt command produces the square root of its argument; it has an optional first argument for other roots.

Examples:

Mathematical Symbols

TLatex can display dozens of special mathematical symbols. A few of them, such as + and > , are produced by typing the corresponding keyboard character. Others are obtained with the commands in the following table:

Delimiters

TLatex provides 4 kinds of proportional delimiters:

#[]{....} or "a la" Latex #left[.....#right] : big square brackets
#{}{....} or              #left{.....#right} : big curly brackets
#||{....} or              #left|.....#right| : big absolute value symbols
#(){....} or              #left(.....#right) : big parentheses

Greek Letters

The command to produce a lowercase Greek letter is obtained by adding a # to the name of the letter. For an uppercase Greek letter, just capitalize the first letter of the command name. Some letters have two representations. The name of the second one (the "variation") starts with "var". The following table gives the complete list:

Accents

Several kind of accents are available:

The special sign: slash draws a slash on top of the text between brackets:

Bar and vectors sign are done the following way:

Changing Style

One can change the font, the text color, or the text size at any time using : #font[font-number]{...}, #color[color-number]{...} and #scale[scale-factor]{...}

Examples:

Alignment Rules

The TText alignment rules apply to the TLatex objects with one exception concerning the vertical alignment:

if the vertical alignment = 1 , subscripts are not taken into account
if the vertical alignment = 0 , the text is aligned to the box surrounding the full text with sub and superscripts

This is illustrated by the following example:

{
   TCanvas Tlva("Tlva","Tlva",500,500);
   Tlva.SetGrid();
   Tlva.DrawFrame(0,0,1,1);
   const char *longstring = "K_{S}... K^{*0}... #frac{2s}{#pi#alpha^{2}} #frac{d#sigma}{dcos#theta} (e^{+}e^{-} #rightarrow f#bar{f} ) = #left| #frac{1}{1 - #Delta#alpha} #right|^{2} (1+cos^{2}#theta)";
   TLatex latex;
   latex.SetTextSize(0.025);
   latex.SetTextAlign(13);  //align at top
   latex.DrawLatex(.2,.9,"K_{S}");
   latex.DrawLatex(.3,.9,"K^{*0}");
   latex.DrawLatex(.2,.8,longstring);
   latex.SetTextAlign(12);  //centered
   latex.DrawLatex(.2,.6,"K_{S}");
   latex.DrawLatex(.3,.6,"K^{*0}");
   latex.DrawLatex(.2,.5,longstring);
   latex.SetTextAlign(11);  //default bottom alignment
   latex.DrawLatex(.2,.4,"K_{S}");
   latex.DrawLatex(.3,.4,"K^{*0}");
   latex.DrawLatex(.2,.3,longstring);
   latex.SetTextAlign(10);  //special bottom alignment
   latex.DrawLatex(.2,.2,"K_{S}");
   latex.DrawLatex(.3,.2,"K^{*0}");
   latex.DrawLatex(.2,.1,longstring);
   latex.SetTextAlign(12);
   latex.SetTextFont(72);
   latex.DrawLatex(.1,.80,"13");
   latex.DrawLatex(.1,.55,"12");
   latex.DrawLatex(.1,.35,"11");
   latex.DrawLatex(.1,.18,"10");
   return Tlva;
}

Character Adjustment

The two commands #kern and #lower enable a better control over character placement. The command #kern[(Float_t)dx]{text} moves the output string horizontally by the fraction dx of its length. Similarly, #lower[(Float_t)dy]{text} shifts the text up or down by the fraction dy of its height.

Examples:

Italic and Boldface

Text can be turned italic or boldface using the commands #it and #bf.

Examples:

Examples

{
   TCanvas ex1("ex1","Latex",500,600);
   TLatex Tl;
   Tl.SetTextAlign(12);
   Tl.SetTextSize(0.04);
   Tl.DrawLatex(0.1,0.8,"1)   C(x) = d #sqrt{#frac{2}{#lambdaD}}  #int^{x}_{0}cos(#frac{#pi}{2}t^{2})dt");
   Tl.DrawLatex(0.1,0.6,"2)   C(x) = d #sqrt{#frac{2}{#lambdaD}}  #int^{x}cos(#frac{#pi}{2}t^{2})dt");
   Tl.DrawLatex(0.1,0.4,"3)   R = |A|^{2} = #frac{1}{2}(#[]{#frac{1}{2}+C(V)}^{2}+#[]{#frac{1}{2}+S(V)}^{2})");
   Tl.DrawLatex(0.1,0.2,"4)   F(t) = #sum_{i=-#infty}^{#infty}A(i)cos#[]{#frac{i}{t+i}}");
   return ex1;
}

{
   TCanvas ex2("ex2","Latex",500,300);
   TLatex Tl;
   Tl.SetTextAlign(23);
   Tl.SetTextSize(0.08);
   Tl.DrawLatex(0.5,0.95,"e^{+}e^{-}#rightarrowZ^{0}#rightarrowI#bar{I}, q#bar{q}");
   Tl.DrawLatex(0.5,0.75,"|#vec{a}#bullet#vec{b}|=#Sigmaa^{i}_{jk}+b^{bj}_{i}");
   Tl.DrawLatex(0.5,0.5,"i(#partial_{#mu}#bar{#psi}#gamma^{#mu}+m#bar{#psi}=0#Leftrightarrow(#Box+m^{2})#psi=0");
   Tl.DrawLatex(0.5,0.3,"L_{em}=eJ^{#mu}_{em}A_{#mu} , J^{#mu}_{em}=#bar{I}#gamma_{#mu}I , M^{j}_{i}=#SigmaA_{#alpha}#tau^{#alphaj}_{i}");
   return ex2;
}

{
   TCanvas ex3("ex3","Latex",500,300);
   TPaveText pt(.1,.1,.9,.9);
   pt.AddText("#frac{2s}{#pi#alpha^{2}}  #frac{d#sigma}{dcos#theta} (e^{+}e^{-} #rightarrow f#bar{f} ) = ");
   pt.AddText("#left| #frac{1}{1 - #Delta#alpha} #right|^{2} (1+cos^{2}#theta");
   pt.AddText("+ 4 Re #left{ #frac{2}{1 - #Delta#alpha} #chi(s) #[]{#hat{g}_{#nu}^{e}#hat{g}_{#nu}^{f} (1 + cos^{2}#theta) + 2 #hat{g}_{a}^{e}#hat{g}_{a}^{f} cos#theta) } #right}");
   pt.SetLabel("Born equation");
   pt.Draw();
   return ex3;
}

Interface to TMathText

The class TMathText is a TeX math formulae interpreter. It uses plain TeX syntax and uses "\" as control instead of "#". If a piece of text containing "\" is given to TLatex then TMathText is automatically invoked. Therefore, as histograms' titles, axis titles, labels etc ... are drawn using TLatex, the TMathText syntax can be used for them also.

Definition at line 25 of file TLatex.h.

Classes
struct	FormSize_t
	TLatex helper struct holding the dimensions of a piece of text. More...

struct	TextSpec_t
	TLatex helper struct holding the attributes of a piece of text. More...

class	TLatexFormSize
	TLatex helper class used to compute the size of a portion of a formula. More...

Public Types
enum	{ kTextNDC = BIT(14) }

Public Types inherited from TText
enum	{ kTextNDC = BIT(14) }

Public Types inherited from TObject
enum	{ kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kBitMask = 0x00ffffff }

enum	{ kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) }

enum	EStatusBits { kCanDelete = BIT(0), kMustCleanup = BIT(3), kObjInCanvas = BIT(3), kIsReferenced = BIT(4), kHasUUID = BIT(5), kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13) }

Public Member Functions
	TLatex ()
	Default constructor. More...

	TLatex (Double_t x, Double_t y, const char *text)
	Normal constructor. More...

	TLatex (const TLatex &text)
	Copy constructor. More...

virtual	~TLatex ()
	Destructor. More...

void	Copy (TObject &text) const
	Copy this TLatex object to another TLatex. More...

TLatex *	DrawLatex (Double_t x, Double_t y, const char *text)
	Make a copy of this object with the new parameters And copy object attributes. More...

TLatex *	DrawLatexNDC (Double_t x, Double_t y, const char *text)
	Draw this TLatex with new coordinates in NDC. More...

void	GetBoundingBox (UInt_t &w, UInt_t &h, Bool_t angle=kFALSE)
	Return text size in pixels. More...

Double_t	GetHeight () const
	Return height of current pad in pixels. More...

Double_t	GetXsize ()
	Return size of the formula along X in pad coordinates. More...

Double_t	GetYsize ()
	Return size of the formula along Y in pad coordinates. More...

virtual void	Paint (Option_t *option="")
	Paint. More...

virtual void	PaintLatex (Double_t x, Double_t y, Double_t angle, Double_t size, const char *text)
	Main drawing function. More...

virtual void	SavePrimitive (std::ostream &out, Option_t *option="")
	Save primitive as a C++ statement(s) on output stream out. More...

virtual void	SetIndiceSize (Double_t factorSize)
	Set relative size of subscripts and superscripts. More...

virtual void	SetLimitIndiceSize (Int_t limitFactorSize)
	Set limit for text resizing of subscripts and superscripts. More...

Public Member Functions inherited from TText
	TText ()
	Text default constructor. More...

	TText (Double_t x, Double_t y, const char *text)
	Text normal constructor. More...

	TText (Double_t x, Double_t y, const wchar_t *text)
	Text normal constructor. More...

	TText (const TText &text)
	Copy constructor. More...

virtual	~TText ()
	Text default destructor. More...

void	Copy (TObject &text) const
	Copy this text to text. More...

virtual Int_t	DistancetoPrimitive (Int_t px, Int_t py)
	Compute distance from point px,py to a string. More...

virtual TText *	DrawText (Double_t x, Double_t y, const char *text)
	Draw this text with new coordinates. More...

virtual TText *	DrawText (Double_t x, Double_t y, const wchar_t *text)
	Draw this text with new coordinates. More...

virtual TText *	DrawTextNDC (Double_t x, Double_t y, const char *text)
	Draw this text with new coordinates in NDC. More...

virtual TText *	DrawTextNDC (Double_t x, Double_t y, const wchar_t *text)
	Draw this text with new coordinates in NDC. More...

virtual void	ExecuteEvent (Int_t event, Int_t px, Int_t py)
	Execute action corresponding to one event. More...

virtual Rectangle_t	GetBBox ()
	Return the "bounding Box" of the Box. More...

virtual TPoint	GetBBoxCenter ()
	Return the point given by Alignment as 'center'. More...

virtual void	GetControlBox (Int_t x, Int_t y, Double_t theta, Int_t cBoxX[4], Int_t cBoxY[4])
	Return the text control box. More...

virtual void	GetTextAdvance (UInt_t &a, const char *text, const Bool_t kern=kTRUE) const
	Return text advance for string text if kern is true (default) kerning is taken into account. More...

virtual void	GetTextAscentDescent (UInt_t &a, UInt_t &d, const char *text) const
	Return text ascent and descent for string text. More...

virtual void	GetTextAscentDescent (UInt_t &a, UInt_t &d, const wchar_t *text) const
	Return text ascent and descent for string text. More...

virtual void	GetTextExtent (UInt_t &w, UInt_t &h, const char *text) const
	Return text extent for string text. More...

virtual void	GetTextExtent (UInt_t &w, UInt_t &h, const wchar_t *text) const
	Return text extent for string text. More...

const void *	GetWcsTitle (void) const
	Returns the text as UNICODE. More...

Double_t	GetX () const

Double_t	GetY () const

virtual void	ls (Option_t *option="") const
	List this text with its attributes. More...

virtual void	PaintControlBox (Int_t x, Int_t y, Double_t theta)
	Paint the text control box. More...

virtual void	PaintText (Double_t x, Double_t y, const char *text)
	Draw this text with new coordinates. More...

virtual void	PaintText (Double_t x, Double_t y, const wchar_t *text)
	Draw this text with new coordinates. More...

virtual void	PaintTextNDC (Double_t u, Double_t v, const char *text)
	Draw this text with new coordinates in NDC. More...

virtual void	PaintTextNDC (Double_t u, Double_t v, const wchar_t *text)
	Draw this text with new coordinates in NDC. More...

virtual void	Print (Option_t *option="") const
	Dump this text with its attributes. More...

virtual void	SetBBoxCenter (const TPoint &p)
	Set the point given by Alignment as 'center'. More...

virtual void	SetBBoxCenterX (const Int_t x)
	Set X coordinate of the point given by Alignment as 'center'. More...

virtual void	SetBBoxCenterY (const Int_t y)
	Set Y coordinate of the point given by Alignment as 'center'. More...

virtual void	SetBBoxX1 (const Int_t x)
	Set left hand side of BoundingBox to a value (resize in x direction on left) More...

virtual void	SetBBoxX2 (const Int_t x)
	Set right hand side of BoundingBox to a value (resize in x direction on right) More...

virtual void	SetBBoxY1 (const Int_t y)
	Set top of BoundingBox to a value (resize in y direction on top) More...

virtual void	SetBBoxY2 (const Int_t y)
	Set bottom of BoundingBox to a value (resize in y direction on bottom) More...

virtual void	SetMbTitle (const wchar_t *title=L"")
	Change (i.e. set) the title of the TNamed. More...

virtual void	SetNDC (Bool_t isNDC=kTRUE)
	Set NDC mode on if isNDC = kTRUE, off otherwise. More...

virtual void	SetText (Double_t x, Double_t y, const char *text)

virtual void	SetText (Double_t x, Double_t y, const wchar_t *text)

virtual void	SetX (Double_t x)

virtual void	SetY (Double_t y)

Public Member Functions inherited from TNamed
	TNamed ()

	TNamed (const char name, const char title)

	TNamed (const TString &name, const TString &title)

	TNamed (const TNamed &named)
	TNamed copy ctor. More...

virtual	~TNamed ()

virtual void	Clear (Option_t *option="")
	Set name and title to empty strings (""). More...

virtual TObject *	Clone (const char *newname="") const
	Make a clone of an object using the Streamer facility. More...

virtual Int_t	Compare (const TObject *obj) const
	Compare two TNamed objects. More...

virtual void	FillBuffer (char *&buffer)
	Encode TNamed into output buffer. More...

virtual const char *	GetName () const
	Returns name of object. More...

virtual const char *	GetTitle () const
	Returns title of object. More...

virtual ULong_t	Hash () const
	Return hash value for this object. More...

virtual Bool_t	IsSortable () const

TNamed &	operator= (const TNamed &rhs)
	TNamed assignment operator. More...

virtual void	SetName (const char *name)
	Set the name of the TNamed. More...

virtual void	SetNameTitle (const char name, const char title)
	Set all the TNamed parameters (name and title). More...

virtual void	SetTitle (const char *title="")
	Set the title of the TNamed. More...

virtual Int_t	Sizeof () const
	Return size of the TNamed part of the TObject. More...

Public Member Functions inherited from TObject
	TObject ()
	TObject constructor. More...

	TObject (const TObject &object)
	TObject copy ctor. More...

virtual	~TObject ()
	TObject destructor. More...

void	AbstractMethod (const char *method) const
	Use this method to implement an "abstract" method that you don't want to leave purely abstract. More...

virtual void	AppendPad (Option_t *option="")
	Append graphics object to current pad. More...

virtual void	Browse (TBrowser *b)
	Browse object. May be overridden for another default action. More...

virtual const char *	ClassName () const
	Returns name of class to which the object belongs. More...

virtual void	Delete (Option_t *option="")
	Delete this object. More...

virtual void	Draw (Option_t *option="")
	Default Draw method for all objects. More...

virtual void	DrawClass () const
	Draw class inheritance tree of the class to which this object belongs. More...

virtual TObject *	DrawClone (Option_t *option="") const
	Draw a clone of this object in the current pad. More...

virtual void	Dump () const
	Dump contents of object on stdout. More...

virtual void	Error (const char method, const char msgfmt,...) const
	Issue error message. More...

virtual void	Execute (const char method, const char params, Int_t *error=0)
	Execute method on this object with the given parameter string, e.g. More...

virtual void	Execute (TMethod method, TObjArray params, Int_t *error=0)
	Execute method on this object with parameters stored in the TObjArray. More...

virtual void	Fatal (const char method, const char msgfmt,...) const
	Issue fatal error message. More...

virtual TObject *	FindObject (const char *name) const
	Must be redefined in derived classes. More...

virtual TObject *	FindObject (const TObject *obj) const
	Must be redefined in derived classes. More...

virtual Option_t *	GetDrawOption () const
	Get option used by the graphics system to draw this object. More...

virtual const char *	GetIconName () const
	Returns mime type name of object. More...

virtual char *	GetObjectInfo (Int_t px, Int_t py) const
	Returns string containing info about the object at position (px,py). More...

virtual Option_t *	GetOption () const

virtual UInt_t	GetUniqueID () const
	Return the unique object id. More...

virtual Bool_t	HandleTimer (TTimer *timer)
	Execute action in response of a timer timing out. More...

virtual void	Info (const char method, const char msgfmt,...) const
	Issue info message. More...

virtual Bool_t	InheritsFrom (const char *classname) const
	Returns kTRUE if object inherits from class "classname". More...

virtual Bool_t	InheritsFrom (const TClass *cl) const
	Returns kTRUE if object inherits from TClass cl. More...

virtual void	Inspect () const
	Dump contents of this object in a graphics canvas. More...

void	InvertBit (UInt_t f)

virtual Bool_t	IsEqual (const TObject *obj) const
	Default equal comparison (objects are equal if they have the same address in memory). More...

virtual Bool_t	IsFolder () const
	Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...

Bool_t	IsOnHeap () const

Bool_t	IsZombie () const

void	MayNotUse (const char *method) const
	Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary). More...

virtual Bool_t	Notify ()
	This method must be overridden to handle object notification. More...

void	Obsolete (const char method, const char asOfVers, const char *removedFromVers) const
	Use this method to declare a method obsolete. More...

void	operator delete (void *ptr)
	Operator delete. More...

void	operator delete[] (void *ptr)
	Operator delete []. More...

void *	operator new (size_t sz)

void *	operator new (size_t sz, void *vp)

void *	operator new[] (size_t sz)

void *	operator new[] (size_t sz, void *vp)

TObject &	operator= (const TObject &rhs)
	TObject assignment operator. More...

virtual void	Pop ()
	Pop on object drawn in a pad to the top of the display list. More...

virtual Int_t	Read (const char *name)
	Read contents of object with specified name from the current directory. More...

virtual void	RecursiveRemove (TObject *obj)
	Recursively remove this object from a list. More...

void	ResetBit (UInt_t f)

virtual void	SaveAs (const char filename="", Option_t option="") const
	Save this object in the file specified by filename. More...

void	SetBit (UInt_t f, Bool_t set)
	Set or unset the user status bits as specified in f. More...

void	SetBit (UInt_t f)

virtual void	SetDrawOption (Option_t *option="")
	Set drawing option for object. More...

virtual void	SetUniqueID (UInt_t uid)
	Set the unique object id. More...

virtual void	SysError (const char method, const char msgfmt,...) const
	Issue system error message. More...

Bool_t	TestBit (UInt_t f) const

Int_t	TestBits (UInt_t f) const

virtual void	UseCurrentStyle ()
	Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked. More...

virtual void	Warning (const char method, const char msgfmt,...) const
	Issue warning message. More...

virtual Int_t	Write (const char *name=0, Int_t option=0, Int_t bufsize=0)
	Write this object to the current directory. More...

virtual Int_t	Write (const char *name=0, Int_t option=0, Int_t bufsize=0) const
	Write this object to the current directory. More...

Public Member Functions inherited from TAttText
	TAttText ()
	AttText default constructor. More...

	TAttText (Int_t align, Float_t angle, Color_t color, Style_t font, Float_t tsize)
	AttText normal constructor. More...

virtual	~TAttText ()
	AttText destructor. More...

void	Copy (TAttText &atttext) const
	Copy this text attributes to a new TAttText. More...

virtual Short_t	GetTextAlign () const
	Return the text alignment. More...

virtual Float_t	GetTextAngle () const
	Return the text angle. More...

virtual Color_t	GetTextColor () const
	Return the text color. More...

virtual Font_t	GetTextFont () const
	Return the text font. More...

virtual Float_t	GetTextSize () const
	Return the text size. More...

virtual void	Modify ()
	Change current text attributes if necessary. More...

virtual void	ResetAttText (Option_t *toption="")
	Reset this text attributes to default values. More...

virtual void	SaveTextAttributes (std::ostream &out, const char *name, Int_t alidef=12, Float_t angdef=0, Int_t coldef=1, Int_t fondef=61, Float_t sizdef=1)
	Save text attributes as C++ statement(s) on output stream out. More...

virtual void	SetTextAlign (Short_t align=11)
	Set the text alignment. More...

virtual void	SetTextAngle (Float_t tangle=0)
	Set the text angle. More...

virtual void	SetTextAttributes ()
	Invoke the DialogCanvas Text attributes. More...

virtual void	SetTextColor (Color_t tcolor=1)
	Set the text color. More...

virtual void	SetTextColorAlpha (Color_t tcolor, Float_t talpha)
	Set a transparent marker color. More...

virtual void	SetTextFont (Font_t tfont=62)
	Set the text font. More...

virtual void	SetTextSize (Float_t tsize=1)
	Set the text size. More...

virtual void	SetTextSizePixels (Int_t npixels)
	Set the text size in pixels. More...

Public Member Functions inherited from TAttBBox2D
virtual	~TAttBBox2D ()

Public Member Functions inherited from TAttLine
	TAttLine ()
	AttLine default constructor. More...

	TAttLine (Color_t lcolor, Style_t lstyle, Width_t lwidth)
	AttLine normal constructor. More...

virtual	~TAttLine ()
	AttLine destructor. More...

void	Copy (TAttLine &attline) const
	Copy this line attributes to a new TAttLine. More...

Int_t	DistancetoLine (Int_t px, Int_t py, Double_t xp1, Double_t yp1, Double_t xp2, Double_t yp2)
	Compute distance from point px,py to a line. More...

virtual Color_t	GetLineColor () const
	Return the line color. More...

virtual Style_t	GetLineStyle () const
	Return the line style. More...

virtual Width_t	GetLineWidth () const
	Return the line width. More...

virtual void	Modify ()
	Change current line attributes if necessary. More...

virtual void	ResetAttLine (Option_t *option="")
	Reset this line attributes to default values. More...

virtual void	SaveLineAttributes (std::ostream &out, const char *name, Int_t coldef=1, Int_t stydef=1, Int_t widdef=1)
	Save line attributes as C++ statement(s) on output stream out. More...

virtual void	SetLineAttributes ()
	Invoke the DialogCanvas Line attributes. More...

virtual void	SetLineColor (Color_t lcolor)
	Set the line color. More...

virtual void	SetLineColorAlpha (Color_t lcolor, Float_t lalpha)
	Set a transparent line color. More...

virtual void	SetLineStyle (Style_t lstyle)
	Set the line style. More...

virtual void	SetLineWidth (Width_t lwidth)
	Set the line width. More...

Protected Member Functions
TLatexFormSize	Anal1 (TextSpec_t spec, const Char_t *t, Int_t length)
	Analyse function. More...

TLatexFormSize	Analyse (Double_t x, Double_t y, TextSpec_t spec, const Char_t *t, Int_t length)
	Analyse and paint the TLatex formula. More...

Int_t	CheckLatexSyntax (TString &text)
	Check if the Latex syntax is correct. More...

void	DrawCircle (Double_t x1, Double_t y1, Double_t r, TextSpec_t spec)
	Draw an arc of ellipse in a Latex formula (right or left parenthesis) More...

void	DrawLine (Double_t x1, Double_t y1, Double_t x2, Double_t y2, TextSpec_t spec)
	Draw a line in a Latex formula. More...

void	DrawParenthesis (Double_t x1, Double_t y1, Double_t r1, Double_t r2, Double_t phimin, Double_t phimax, TextSpec_t spec)
	Draw an arc of ellipse in a Latex formula (right or left parenthesis) More...

TLatexFormSize	FirstParse (Double_t angle, Double_t size, const Char_t *text)
	First parsing of the analyse sequence. More...

TLatex &	operator= (const TLatex &)
	assignment operator More...

Int_t	PaintLatex1 (Double_t x, Double_t y, Double_t angle, Double_t size, const char *text)
	Drawing function. More...

TLatexFormSize	Readfs ()
	Read fs in fTabSize. More...

void	Savefs (TLatexFormSize *fs)
	Save fs values in array fTabSize. More...

Protected Member Functions inherited from TObject
virtual void	DoError (int level, const char location, const char fmt, va_list va) const
	Interface to ErrorHandler (protected). More...

void	MakeZombie ()

Protected Attributes
const Char_t *	fError
	! error code More...

Double_t	fFactorPos
	! Relative position of subscripts and superscripts More...

Double_t	fFactorSize
	! Relative size of subscripts and superscripts More...

Bool_t	fItalic
	! Currently inside italic operator More...

Int_t	fLimitFactorSize
	lower bound for subscripts/superscripts size More...

Double_t	fOriginSize
	Font size of the starting font. More...

Int_t	fPos
	! Current position in array fTabSize; More...

Bool_t	fShow
	! is true during the second pass (Painting) More...

Int_t	fTabMax
	! Maximum allocation for array fTabSize; More...

FormSize_t *	fTabSize
	! array of values for the different zones More...

Protected Attributes inherited from TText
void *	fWcsTitle
	!Used by TMathText More...

Double_t	fX
	X position of text (left,center,etc..) More...

Double_t	fY
	Y position of text (left,center,etc..) More...

Protected Attributes inherited from TNamed
TString	fName

TString	fTitle

Protected Attributes inherited from TAttText
Short_t	fTextAlign
	Text alignment. More...

Float_t	fTextAngle
	Text angle. More...

Color_t	fTextColor
	Text color. More...

Font_t	fTextFont
	Text font. More...

Float_t	fTextSize
	Text size. More...

Protected Attributes inherited from TAttLine
Color_t	fLineColor
	Line color. More...

Style_t	fLineStyle
	Line style. More...

Width_t	fLineWidth
	Line width. More...

Additional Inherited Members
Static Public Member Functions inherited from TObject
static Long_t	GetDtorOnly ()
	Return destructor only flag. More...

static Bool_t	GetObjectStat ()
	Get status of object stat flag. More...

static void	SetDtorOnly (void *obj)
	Set destructor only flag. More...

static void	SetObjectStat (Bool_t stat)
	Turn on/off tracking of objects in the TObjectTable. More...

#include <TLatex.h>

Inheritance diagram for TLatex:

[legend]

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

Enumerator
kTextNDC	The text postion is in NDC coordinates.

Definition at line 110 of file TLatex.h.

Constructor & Destructor Documentation

◆ TLatex() [1/3]

TLatex::TLatex ( )

Default constructor.

Definition at line 389 of file TLatex.cxx.

◆ TLatex() [2/3]

TLatex::TLatex	(	Double_t	x,
		Double_t	y,
		const char *	text
	)

Normal constructor.

Definition at line 407 of file TLatex.cxx.

◆ TLatex() [3/3]

TLatex::TLatex ( const TLatex & text )

Copy constructor.

Definition at line 433 of file TLatex.cxx.

◆ ~TLatex()

TLatex::~TLatex ( )

virtual

Destructor.

Definition at line 426 of file TLatex.cxx.

Member Function Documentation

◆ Anal1()

TLatex::TLatexFormSize TLatex::Anal1	(	TextSpec_t	spec,
		const Char_t *	t,
		Int_t	length
	)

protected

Analyse function.

Definition at line 492 of file TLatex.cxx.

◆ Analyse()

TLatex::TLatexFormSize TLatex::Analyse	(	Double_t	x,
		Double_t	y,
		TextSpec_t	spec,
		const Char_t *	t,
		Int_t	length
	)

protected

Analyse and paint the TLatex formula.

It is called twice : first for calculating the size of each portion of the formula, then to paint the formula. When analyse finds an operator or separator, it calls itself recursively to analyse the arguments of the operator. when the argument is an atom (normal text), it calculates the size of it and return it as the result. for example : if the operator #frac{arg1}{arg2} is found : Analyse(arg1) return the size of arg1 (width, up, down) Analyse(arg2) return the size of arg2 now, we know the size of #frac{arg1}{arg2}:

width = max(width_arg1, width_arg2)
up    = up_arg1 + down_arg1
down  = up_arg2 + down_arg2

so, when the user wants to paint a fraction at position (x,y), the rect used for the formula is : (x,y-up,x+width,y+down)

return size of zone occupied by the text/formula

t : chain to be analyzed
length : number of chars in t.

Definition at line 524 of file TLatex.cxx.

◆ CheckLatexSyntax()

Int_t TLatex::CheckLatexSyntax ( TString & text )

protected

Check if the Latex syntax is correct.

Definition at line 2246 of file TLatex.cxx.

◆ Copy()

void TLatex::Copy ( TObject & text ) const

virtual

Copy this TLatex object to another TLatex.

Reimplemented from TNamed.

Definition at line 473 of file TLatex.cxx.

◆ DrawCircle()

void TLatex::DrawCircle	(	Double_t	x1,
		Double_t	y1,
		Double_t	r,
		TextSpec_t	spec
	)

protected

Draw an arc of ellipse in a Latex formula (right or left parenthesis)

Definition at line 1957 of file TLatex.cxx.

◆ DrawLatex()

TLatex * TLatex::DrawLatex	(	Double_t	x,
		Double_t	y,
		const char *	text
	)

Make a copy of this object with the new parameters And copy object attributes.

Definition at line 1914 of file TLatex.cxx.

◆ DrawLatexNDC()

TLatex * TLatex::DrawLatexNDC	(	Double_t	x,
		Double_t	y,
		const char *	text
	)

Draw this TLatex with new coordinates in NDC.

Definition at line 1927 of file TLatex.cxx.

◆ DrawLine()

void TLatex::DrawLine	(	Double_t	x1,
		Double_t	y1,
		Double_t	x2,
		Double_t	y2,
		TextSpec_t	spec
	)

protected

Draw a line in a Latex formula.

Definition at line 1937 of file TLatex.cxx.

◆ DrawParenthesis()

void TLatex::DrawParenthesis	(	Double_t	x1,
		Double_t	y1,
		Double_t	r1,
		Double_t	r2,
		Double_t	phimin,
		Double_t	phimax,
		TextSpec_t	spec
	)

protected

Draw an arc of ellipse in a Latex formula (right or left parenthesis)

Definition at line 1986 of file TLatex.cxx.

◆ FirstParse()

TLatex::TLatexFormSize TLatex::FirstParse	(	Double_t	angle,
		Double_t	size,
		const Char_t *	text
	)

protected

First parsing of the analyse sequence.

Definition at line 2450 of file TLatex.cxx.

◆ GetBoundingBox()

void TLatex::GetBoundingBox	(	UInt_t &	w,
		UInt_t &	h,
		Bool_t	angle = `kFALSE`
	)

virtual

Return text size in pixels.

Reimplemented from TText.

Definition at line 2538 of file TLatex.cxx.

◆ GetHeight()

Double_t TLatex::GetHeight ( ) const

Return height of current pad in pixels.

Definition at line 2494 of file TLatex.cxx.

◆ GetXsize()

Double_t TLatex::GetXsize ( )

Return size of the formula along X in pad coordinates.

Definition at line 2507 of file TLatex.cxx.

◆ GetYsize()

Double_t TLatex::GetYsize ( )

Return size of the formula along Y in pad coordinates.

Definition at line 2594 of file TLatex.cxx.

◆ operator=()

TLatex & TLatex::operator= ( const TLatex & lt )

protected

assignment operator

Definition at line 451 of file TLatex.cxx.

◆ Paint()

void TLatex::Paint ( Option_t * option = "" )

virtual

Paint.

Reimplemented from TText.

Definition at line 2017 of file TLatex.cxx.

◆ PaintLatex()

void TLatex::PaintLatex	(	Double_t	x,
		Double_t	y,
		Double_t	angle,
		Double_t	size,
		const char *	text
	)

virtual

Main drawing function.

Warning: Unlike most others "XYZ::PaintXYZ" methods, PaintLatex modifies the TLatex data members.

Definition at line 2038 of file TLatex.cxx.

◆ PaintLatex1()

Int_t TLatex::PaintLatex1	(	Double_t	x,
		Double_t	y,
		Double_t	angle,
		Double_t	size,
		const char *	text
	)

protected

Drawing function.

Definition at line 2128 of file TLatex.cxx.

◆ Readfs()

TLatex::TLatexFormSize TLatex::Readfs ( )

protected

Read fs in fTabSize.

Definition at line 2625 of file TLatex.cxx.

◆ Savefs()

void TLatex::Savefs ( TLatex::TLatexFormSize * fs )

protected

Save fs values in array fTabSize.

Definition at line 2635 of file TLatex.cxx.

◆ SavePrimitive()

void TLatex::SavePrimitive	(	std::ostream &	out,
		Option_t *	option = `""`
	)

virtual

Save primitive as a C++ statement(s) on output stream out.

Reimplemented from TText.

Definition at line 2657 of file TLatex.cxx.

◆ SetIndiceSize()

void TLatex::SetIndiceSize ( Double_t factorSize )

virtual

Set relative size of subscripts and superscripts.

Definition at line 2683 of file TLatex.cxx.

◆ SetLimitIndiceSize()

void TLatex::SetLimitIndiceSize ( Int_t limitFactorSize )

virtual

Set limit for text resizing of subscripts and superscripts.

Definition at line 2691 of file TLatex.cxx.

Member Data Documentation

◆ fError

const Char_t* TLatex::fError

protected

! error code

Definition at line 81 of file TLatex.h.

◆ fFactorPos

Double_t TLatex::fFactorPos

protected

! Relative position of subscripts and superscripts

Definition at line 79 of file TLatex.h.

◆ fFactorSize

Double_t TLatex::fFactorSize

protected

! Relative size of subscripts and superscripts

Definition at line 78 of file TLatex.h.

◆ fItalic

Bool_t TLatex::fItalic

protected

! Currently inside italic operator

Definition at line 87 of file TLatex.h.

◆ fLimitFactorSize

Int_t TLatex::fLimitFactorSize

protected

lower bound for subscripts/superscripts size

Definition at line 80 of file TLatex.h.

◆ fOriginSize

Double_t TLatex::fOriginSize

protected

Font size of the starting font.

Definition at line 84 of file TLatex.h.

◆ fPos

Int_t TLatex::fPos

protected

! Current position in array fTabSize;

Definition at line 86 of file TLatex.h.

◆ fShow

Bool_t TLatex::fShow

protected

! is true during the second pass (Painting)

Definition at line 82 of file TLatex.h.

◆ fTabMax

Int_t TLatex::fTabMax

protected

! Maximum allocation for array fTabSize;

Definition at line 85 of file TLatex.h.

◆ fTabSize

FormSize_t* TLatex::fTabSize

protected

! array of values for the different zones

Definition at line 83 of file TLatex.h.

The documentation for this class was generated from the following files:

graf2d/graf/inc/TLatex.h
graf2d/graf/src/TLatex.cxx

Subscripts and Superscripts

Fractions

Splitting Lines

Roots

Mathematical Symbols

Delimiters

Greek Letters

Accents

Changing Style

Alignment Rules

Character Adjustment

Italic and Boldface

Examples

Interface to TMathText

Classes

Public Types

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Member Enumeration Documentation

◆ anonymous enum

Constructor & Destructor Documentation

◆ TLatex() [1/3]

◆ TLatex() [2/3]

◆ TLatex() [3/3]

◆ ~TLatex()

Member Function Documentation

◆ Anal1()

◆ Analyse()

◆ CheckLatexSyntax()

◆ Copy()

◆ DrawCircle()

◆ DrawLatex()

◆ DrawLatexNDC()

◆ DrawLine()

◆ DrawParenthesis()

◆ FirstParse()

◆ GetBoundingBox()

◆ GetHeight()

◆ GetXsize()

◆ GetYsize()

◆ operator=()

◆ Paint()

◆ PaintLatex()

◆ PaintLatex1()

◆ Readfs()

◆ Savefs()

◆ SavePrimitive()

◆ SetIndiceSize()

◆ SetLimitIndiceSize()

Member Data Documentation

◆ fError

◆ fFactorPos

◆ fFactorSize

◆ fItalic

◆ fLimitFactorSize

◆ fOriginSize

◆ fPos

◆ fShow

◆ fTabMax

◆ fTabSize