I just want to create a button that will allow me to paint on an image i already have made in my main class. I want this button to draw a square on my image, but whenever i try and use it i cant have it redrawn on my label.

Qt Code: 
  1. #include <QtCore>
  2. #include <QtGui>
  3. #include <QDebug>
  4. #include <CoordinateValue.h>
  5. #include <mainwindow.h>
  6. #include <Level.h>
  7. //#include <Coordinate.h>
  8.  
  9. //#include<Graphics.h>
  10.  
  11. int main(int argc, char *argv[])
  12. {
  13. QApplication app(argc, argv);
  14.  
  15. QLabel window;
  16. QPixmap lvlone;
  17. QPixmap ftowpic;
  18. QIcon ftowicon;
  19.  
  20. lvlone.load(QString::fromUtf8("C:/Users/Agup/Desktop/Map1.bmp"));
  21. ftowpic.load(QString::fromUtf8("C:/Users/Agup/Desktop/FreshmenTower.bmp"));
  22.  
  23. CoordinateValue cv;
  24. //cv.setValid(1);
  25.  
  26. //load pixmap into icon for button
  27. ftowicon.addPixmap(ftowpic);
  28. QSize ftowsize(25,25);
  29.  
  30.  
  31. // next code is to check if worked or not
  32. //qDebug() << goodLoad << lvlone.isNull() << lvlone.size() << lvlone.depth();
  33.  
  34. //make mappaint use the map as background
  35.  
  36.  
  37. QPainter mappaint(&lvlone);
  38.  
  39.  
  40. QPen Black((QColor::QColor(0,0,0)),1);
  41. mappaint.setPen(Black);
  42.  
  43. for(int i = 0;i<501;i += 50)
  44. {
  45.     mappaint.drawLine(0,i,500,i);
  46. }
  47. for(int j = 0;j<501;j += 50)
  48. {
  49.     mappaint.drawLine(j,0,j,500);
  50. }
  51. //use this code to draw towers depenrding on valid spots.
  52. //mappaint.drawPixmap(200,150,50,50, ftowpic);
  53.  
  54.  
  55.  
  56. //QPushButton Start("Start", &window);
  57. //Start.setGeometry(200,200,50,50);
  58. //QObject::connect(&Start,SIGNAL(clicked()),g,SLOT(PaintIT()));
  59.  
  60.  
  61. //freshmen tower button
  62. QPushButton FTower(ftowicon,"Freshmen\n Tower", &window);
  63. FTower.setFont(QFont("Purisa",8));
  64. FTower.setGeometry(500,0,100,100);
  65. FTower.setIconSize(ftowsize);
  66.  
  67.  
  68.  
  69. cv.getPainter(mappaint);
  70.  
  71. QObject::connect(&FTower,SIGNAL(clicked()),&cv, SLOT(paintValid()));
  72. QPushButton quit("Quit", &window);
  73. quit.setFont(QFont("Purisa", 12));
  74. quit.setGeometry(575,400,100,50);
  75. QObject::connect(&quit, SIGNAL(clicked()), &app, SLOT(quit()));
  76.  
  77. window.resize(750,500);
  78. window.setPixmap(lvlone);
  79. window.show();
  80.  
  81. cv.paintValid();
  82. return app.exec();
  83. }
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and it uses a slot from here

Qt Code: 
  1. #ifndef COORDINATEVALUE_H
  2. #define COORDINATEVALUE_H
  3.  
  4.  
  5. #include <QtCore>
  6. #include <QtGui>
  7. #include <QDebug>
  8. #include <Coordinate.h>
  9. class CoordinateValue: public QObject
  10. {
  11.     Q_OBJECT
  12.  
  13.         Coordinate coor[100];
  14.  
  15.     public:
  16.         QPixmap newImage;
  17.         QLabel newWindow;
  18.         QPainter plzwrk;
  19.  
  20.     //makes 100 coordinates
  21.  
  22.         int getSpot(int x,int y)
  23.         {
  24.  
  25.             //returns numerical spot corresponding
  26.             //with array coor for which spot coordinate is in
  27.             return (x%50)+((y/50)*10);
  28.         }
  29.         void setValues()
  30.         {
  31.             //sets each value of grid in image
  32.             //to a value of 1-100 based on location
  33.             int c = 0;
  34.             for(int i = 0; i<500; i+= 50){
  35.                 for(int j = 0;j<500; j+=50)
  36.                 {
  37.                     coor[c].setX(j);
  38.                     coor[c].setY(i);
  39.                     c++;
  40.                 }
  41.             }
  42.         }
  43.         //get X Drawing Coordinates
  44.         int getXDC(int spot)
  45.         {
  46.             return coor[spot].getX();
  47.         }
  48.         //get Y Drawing Coordinates
  49.         int getYDC(int spot)
  50.         {
  51.             return coor[spot].getY();
  52.         }
  53.         void setValid(int levelnum)
  54.        {
  55. //            switch (levelnum)
  56. //                case 1:
  57.  
  58. //                break;
  59. //                case 2:
  60.  
  61. //                break;
  62.  
  63.         }
  64.         void getPainter(QPainter &painter)
  65.         {
  66.             plzwrk = painter;
  67.         }
  68. public slots:
  69.         void paintValid()
  70.         {
  71.                     QPen linepen;
  72.                     linepen.setWidth(2);
  73.                     linepen.setColor(Qt::green);
  74.                     plzwrk.setPen(linepen);
  75.  
  76.                     QPolygon poly;
  77.                     poly<< QPoint(0,0);
  78.                     poly<< QPoint(0,50);
  79.                     poly<< QPoint(50,50);
  80.                     poly<< QPoint(50,0);
  81.  
  82.                     QBrush transbrush;
  83.                     transbrush.setColor(Qt::green);
  84.                     transbrush.setStyle(Qt::Dense5Pattern);
  85.  
  87.                     path.addPolygon(poly);
  88.  
  89.                     plzwrk.drawPolygon(poly);
  90.                     plzwrk.fillPath(path,transbrush);
  91.  
  92.         }
  93.         void doNothing()
  94.         {
  95.             QString new1 = "hi";
  96.             qDebug()<<new1;
  97.         }
  98.  
  99. };
  100. #endif // COORDINATEVALUE_H
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i get that its not neat but any help would greatly be appreciated thanks