I am trying to draw a rectangle anywhere on the screen when the user drags the mouse - as an easier problem I was trying to draw a static rectangle when the mouse is either moved or clicked. Here's what I came up with by following the examples/tutorials, but it doesn't do anything??

Qt Code: 
  1. // g++ rubber.cpp -o ss -lQtGui
  2.  
  3. #include <QtGui/QWidget> 
  4. #include <QtGui/QDesktopWidget>
  5. #include <QtGui/QApplication>
  6. #include <QtGui/QPixmap>
  7. #include <QtGui/QRubberBand>
  8. #include <QtGui/QMouseEvent>
  9. #include <QtGui/QPushButton>
  10. #include <QtGui/QFont>
  11.  
  12. #include <iostream>
  13.  
  14. using namespace std;
  15.  
  16.  class MyWidget : public QWidget
  17.  {
  18. public:
  19.      MyWidget(QWidget *parent = 0);
  20. protected:
  21. 	void mouseMoveEvent( QMouseEvent * e);
  22. 	void mousePressEvent(QMouseEvent *event);
  23.  };
  24.  
  25.  MyWidget::MyWidget(QWidget *parent)
  26.      : QWidget(parent)
  27.  {
  28.      setFixedSize(200, 120);
  29.  
  30.      QPushButton *quit = new QPushButton(tr("Quit"), this);
  31.      quit->setGeometry(62, 40, 75, 30);
  32.  
  33.      connect(quit, SIGNAL(clicked()), qApp, SLOT(quit()));
  34.  }
  35.  
  36.  
  37.  
  38. int main(int argc, char *argv[])
  39. {
  40. 	QApplication MyScreenshot(argc,argv);
  41.  
  42. /*
  43. 	QPoint TopLeft(100,100);
  44. 	QPoint BottomRight(200,200);
  45. 	QRect SelectionRectangle(TopLeft, BottomRight);
  46.  
  47. 	QRubberBand outline (QRubberBand::Rectangle);
  48. 	outline.setGeometry(SelectionRectangle);
  49. 	outline.show();
  50. */	
  51. 	return MyScreenshot.exec();
  52. }
  53.  
  54. void MyWidget::mouseMoveEvent( QMouseEvent * e)
  55. {
  56. 	cout << "Mouse moved!" << endl;
  57.  
  58. 	QPoint TopLeft(100,100);
  59. 	QPoint BottomRight(200,200);
  60. 	QRect SelectionRectangle(TopLeft, BottomRight);
  61.  
  62. 	QRubberBand outline (QRubberBand::Rectangle);
  63. 	outline.setGeometry(SelectionRectangle);
  64. 	outline.show();
  65.  
  66. }
  67.  
  68. void MyWidget::mousePressEvent(QMouseEvent *event)
  69. {
  70. 	if (event->button() == Qt::LeftButton) 
  71. 	{
  72. 		cout << "Left click!" << endl;
  73. 	}
  74.  
  75. 	QPoint TopLeft(100,100);
  76. 	QPoint BottomRight(200,200);
  77. 	QRect SelectionRectangle(TopLeft, BottomRight);
  78.  
  79. 	QRubberBand outline (QRubberBand::Rectangle);
  80. 	outline.setGeometry(SelectionRectangle);
  81. 	outline.show();
  82.  
  83.  }
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