Text in the Interactive Context

Hi,

To do this, one means is to inherit from AIS_InteractiveObject and redefine `Compute' routines.

Here is the InteractiveText class I defined, I use it when I want to display text. Indentation of the code is messed in this post, and there is also classes you probably won't have (like Point3D, Integer, Real, QString if you don't work with Qt). But it is easily adaptable.

The header file:

# include "geometry/3d/Point3D.hpp"

# include

# include
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# include

/*! \class InteractiveText
* \brief Interactive items specialized in the displaying of texts.
*/

DEFINE_STANDARD_HANDLE (InteractiveText, AIS_InteractiveObject)
class InteractiveText : public AIS_InteractiveObject
{
// ------------------- Initialization and Deletion ---------------------
public:
//! Construct a default instance of InteractiveText.
InteractiveText ();

//! Construct a fully initialized instance of InteractiveText.
InteractiveText (const QString& text, const Point3D& pos,
Real angle = 0, Real slant = 0,
Integer color_id = 1, Integer font_id = 1,
Real scale = 0.1);

//! Destruct the instance and free any allocated resources.
virtual ~InteractiveText ();

DEFINE_STANDARD_RTTI (InteractiveText)

// ----------------------------- Access --------------------------------
public:
//! Position of the text displayed.
const Point3D& position () const
{
return _position;
}

//! Text displated by the current InteractiveText object.
QString text () const
{
return _text;
}

//! User friendly string of the instance.
virtual QString to_string () const
{
return _text;
}

// -------------------------- Element change ---------------------------
public:
void set_text (const QString& v);

void set_position (const Point3D& pos);

// -------------------------- Implementation ---------------------------
private:
//! -- from PrsMgr_PresentableObject.
void Compute (const Handle_PrsMgr_PresentationManager3d& pm,
const Handle_Prs3d_Presentation& pres,
const Integer mode);

//! -- from PrsMgr_PresentableObject.
void Compute (const Handle_Prs3d_Projector& proj,
const Handle_Prs3d_Presentation& pres);

//! -- from PrsMgr_PresentableObject.
void Compute (const Handle_PrsMgr_PresentationManager2d& pres,
const Handle_Graphic2d_GraphicObject& gr_obj,
const Integer mode) ;

//! -- from SelectMgr_SelectableObject.
void ComputeSelection (const Handle_SelectMgr_Selection& sel,
const Integer mode);

// ---------------------------- Attributes -----------------------------
protected:
QString _text;
Point3D _position;
Real _angle;
Real _slant;
Integer _color_id;
Integer _font_id;
Real _scale;

Real _width;
Real _height;

};

Now the implementation file :

#include "InteractiveText.hpp"

#include
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IMPLEMENT_STANDARD_HANDLE (InteractiveText, AIS_InteractiveObject)
IMPLEMENT_STANDARD_RTTI (InteractiveText, AIS_InteractiveObject)
//
// Foreach ancestors, we add a IMPLEMENT_STANDARD_SUPERTYPE and
// a IMPLEMENT_STANDARD_SUPERTYPE_ARRAY_ENTRY macro.
// We must respect the order: from the direct ancestor class
// to the base class.
//
IMPLEMENT_STANDARD_TYPE (InteractiveText)
IMPLEMENT_STANDARD_SUPERTYPE (AIS_InteractiveObject)
IMPLEMENT_STANDARD_SUPERTYPE (SelectMgr_SelectableObject)
IMPLEMENT_STANDARD_SUPERTYPE (PrsMgr_PresentableObject)
IMPLEMENT_STANDARD_SUPERTYPE (MMgt_TShared)
IMPLEMENT_STANDARD_SUPERTYPE (Standard_Transient)
IMPLEMENT_STANDARD_SUPERTYPE_ARRAY ()
IMPLEMENT_STANDARD_SUPERTYPE_ARRAY_ENTRY (AIS_InteractiveObject)
IMPLEMENT_STANDARD_SUPERTYPE_ARRAY_ENTRY (SelectMgr_SelectableObject)
IMPLEMENT_STANDARD_SUPERTYPE_ARRAY_ENTRY (PrsMgr_PresentableObject)
IMPLEMENT_STANDARD_SUPERTYPE_ARRAY_ENTRY (MMgt_TShared)
IMPLEMENT_STANDARD_SUPERTYPE_ARRAY_ENTRY (Standard_Transient)
IMPLEMENT_STANDARD_SUPERTYPE_ARRAY_END ()
IMPLEMENT_STANDARD_TYPE_END (InteractiveText)

#include
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// ------------------- Initialization and Deletion ---------------------
InteractiveText::InteractiveText () :
AIS_InteractiveObject (),
_width (0), _height (0)
{
}

InteractiveText::InteractiveText (const QString& text, const Point3D& pos,
Real angle, Real slant,
Integer color_id, Integer font_id,
Real scale) :
AIS_InteractiveObject (),
_text (text), _position (pos),
_angle (angle), _slant (slant),
_color_id (color_id), _font_id (font_id),
_scale (scale),
_width (0), _height (0)
{
}

InteractiveText::~InteractiveText ()
{
}

// -------------------------- Element change ---------------------------

void InteractiveText::set_text (const QString& v)
{
_text = v;
}

void InteractiveText::set_position (const Point3D& pos)
{
_position = pos;
}

// -------------------------- Implementation ---------------------------

void InteractiveText::Compute (const Handle_PrsMgr_PresentationManager3d& pm,
const Handle_Prs3d_Presentation& pres,
const Integer mode)
{
Prs3d_Text::Draw (pres, myDrawer, (Standard_CString) _text.ascii (),
gp_Pnt (_position.x (),
_position.y (),
_position.z ()));
}

void InteractiveText::Compute (const Handle_Prs3d_Projector& proj,
const Handle_Prs3d_Presentation& pres)
{

}

void InteractiveText::Compute (const Handle_PrsMgr_PresentationManager2d& pres,
const Handle_Graphic2d_GraphicObject& gr_obj,
const Integer mode)
{
Handle_Graphic2d_Text text =
new Graphic2d_Text (gr_obj, (Standard_CString) _text.ascii (),
_position.x (), _position.y (),
_angle, Aspect_TOT_SOLID, _scale);
text->SetFontIndex (_font_id);

text->SetColorIndex (_color_id);

text->SetSlant (_slant);
text->SetUnderline (false);
text->SetZoomable (true);
gr_obj->Display ();
Real x_offset;
Real y_offset;
text->TextSize (_width, _height, x_offset, y_offset);
}

void InteractiveText::ComputeSelection (const Handle_SelectMgr_Selection& sel,
const Integer mode)
{
}