Plotting two-dimensional rectangles in OCC

Draw a two-level rectangle on the screen

#include <Visual3d_Layer.hxx>

#include <V3d_LayerMgr.hxx>

#include <Visual3d_ViewManager.hxx>

#include "FTFont.h"

#include "FTGLBitmapFont.h"

Class V3d_textitem:public Visual3d_layeritem {public:

V3d_textitem (const Handle (visual3d_layer) & Thelayer);

void Redrawlayerprs ();

Private

Standard_real myX1;

Standard_real myY1;

Tcollection_asciistring MyText;

Standard_real Myheight;

Handle (Visual3d_layer) Mylayer;

Quantity_color MyColor;

Quantity_color Mysubtitlecolor;

Aspect_typeofdisplaytext MyType;

Tcollection_asciistring Myfontname;

};

V3d_textitem::v3d_textitem (const Handle (visual3d_layer) & Thelayer): Mylayer (Thelayer)

{

if (!mylayer.isnull ()) Mylayer->addlayeritem (this);

}

void V3d_textitem::redrawlayerprs ()

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Interactive_context_->currentviewer ()->initactiveviews ();

Handle (v3d_view) V3d_view = Interactive_context_->currentviewer ()->activeview ();

Handle (visual3d_layer) Anoverlay = Interactive_context_->currentviewer ()->viewer ()->overlayer ();

if (Anoverlay.isnull ())

{

Handle (v3d_layermgr) amgr = new V3d_layermgr (V3d_view);    Anoverlay = Amgr->overlay (); V3d_view->setlayermgr (amgr);

}

Anoverlay->begin ();

Anoverlay->drawrectangle (0, 0, 100, 100);

Anoverlay->end ();

A visual3d_layer associated with a v3d, first compiled into a display list, and then rendered.

To draw a two-dimensional rectangle in OCC