Hi there!

I'm afraid it is not. The solid black background stays in my application. As you suggested, I continued our minimal error example in introducing the 3DTextItem and a dummy ProjectedItem. Sadly, still works.

main.cpp:

Qt Code: 
  1. #include <QtGui>
  2. #include <QGLWidget>
  3. #include "textitem.h"
  4.  
  5. class CGLScene : public QGraphicsScene
  6. {
  7. protected:
  8. 	void drawBackground(QPainter *painter, const QRectF &rect)
  9. 	{
  10. 		glClearColor(1.0,1.0,0.0,1.0);
  11. 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  12. 	}
  13. };
  14.  
  15. int main(int argc, char **argv){
  16.   QApplication app(argc, argv);
  18.   CGLScene scene;
  19.  
  20.   view.setScene(&scene);
  21.   view.setViewport(new QGLWidget);
  22.  
  23.   CGL3dTextItem* item = new CGL3dTextItem("");
  24.   item->setHTML("<font color=#FF0000>FAT TEST </font>");
  25.  
  26.   scene.addItem(item);
  27.  
  28.   QFont f;
  29.   f.setPointSize(36);
  30.   item->setFont(f);
  31.   item->setFlag(QGraphicsItem::ItemIsMovable);
  32.   //item->setCacheMode(QGraphicsItem::ItemCoordinateCache);
  33.  
  34.   QTransform trans;
  35.   trans.rotate(60, Qt::YAxis);
  36.   item->setTransform(trans);
  37.   item->setOpacity(1);
  38.   view.show();
  39.   return app.exec();
  40. }
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textitem.h - a separate header file for moc to start up.
Qt Code: 
  1. #ifndef TEXTITEM_H
  2. #define TEXTITEM_H
  3.  
  4. #include <QtGui>
  5. #include <QObject>
  6.  
  7. class CGL3dProjectedItem : public QObject, public QGraphicsItem
  8. {	Q_OBJECT
  9. protected:
  10. 	virtual QRectF boundingRect() const {return shape().boundingRect();}
  11. 	virtual QPainterPath shape() const {QPainterPath p;QPolygonF polygon = mapToScene(this->childrenBoundingRect());p.addPolygon(polygon);return p;}
  12. 	virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0) {}
  13. };
  14.  
  15. class CGL3dTextItem : public CGL3dProjectedItem
  16. {	Q_OBJECT
  17. 	Q_PROPERTY(QObject* textitem READ getTextItem)
  18. 	Q_PROPERTY(QString text READ getText WRITE setText)
  19. 	Q_PROPERTY(QString html READ getHTML WRITE setHTML)
  20. 	Q_PROPERTY(QFont font READ getFont WRITE setFont)
  21. public:
  22. 	CGL3dTextItem(QString text) : CGL3dProjectedItem()
  23. 	{
  24. 		_textitem = new QGraphicsTextItem(text,this);
  25. 		_textitem->setTextInteractionFlags(Qt::TextBrowserInteraction);
  26. 		QTextOption textoption(Qt::AlignCenter);
  27. 		textoption.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
  28. 		_textitem->document()->setDefaultTextOption(textoption);
  29. 		_textitem->setCacheMode(QGraphicsItem::ItemCoordinateCache);
  30. 		//setHandlesChildEvents(true);
  31. 	}
  32. 	enum { Type = UserType+2};
  33. 	int type() const { return Type;}
  34. 	QObject* getTextItem() {return _textitem;}
  35. 	QString getText() {return _textitem->toPlainText();}
  36. 	void setText(QString plaintext) {_textitem->setPlainText(plaintext);TextChanged();}
  37. 	QString getHTML() {return _textitem->toHtml();}
  38. 	void setHTML(QString htmltext) {_textitem->setHtml(htmltext);TextChanged();}
  39. 	QFont getFont() {return _textitem->font();}
  40. 	void setFont(QFont f) {_textitem->setFont(f);TextChanged();}
  41. protected:
  42. 	void TextChanged()
  43. 	{
  44. 	//	SetCenterPos(CGL3d(-_textitem->document()->size().width()/2,0,0));
  45. 		//qDebug() << "TextItem Center: " << CenterPos().toString();
  46. 	}
  47. private:
  48. 	QGraphicsTextItem* _textitem;
  49. };
  50.  
  51. #endif // TEXTITEM_H
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So maybe the problem is hidden in the kind of transformation I am doing. I will investigate.

Thx

Joh