Hello!
I am working on a game, but I can't get the player to move when the WASD keys are pressed. I even tried making a new project and simply animating a square, but it wouldn't even work for me when I did that!
NOTE: In the following code, I removed all my failed attempts at animating, so the code does run and there are no fatal errors.

My code:

dialog.h
Qt Code: 
  1. #include "player.h"
  2. #include "zombie.h"
  3.  
  4. #include <QDialog>
  5. #include <QGraphicsScene>
  6. #include <QPropertyAnimation>
  7.  
  8. namespace Ui {
  9. class Dialog;
  10. }
  11.  
  12. class Dialog : public QDialog
  13. {
  14.     Q_OBJECT
  15.  
  16. public:
  17.     explicit Dialog(QWidget *parent = 0);
  18.     ~Dialog();
  21.     player *p;
  22.     zombie *z;
  23.     void keyPressEvent(QKeyEvent *event);
  24. private:
  25.     Ui::Dialog *ui;
  26. };
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player.h
Qt Code: 
  1. #include <QGraphicsItem>
  2. #include <QPropertyAnimation>
  3.  
  4. class player : public QGraphicsItem
  5. {
  6. public:
  7.     player();
  8.     QRectF boundingRect() const;
  9.     void paint(QPainter *painter, const QStyleOptionGraphicsItem *options, QWidget *widget);
  10.     void moveUp();
  11.     void moveLeft();
  12.     void moveDown();
  13.     void moveRight();
  14. private slots:
  15. };
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dialog.cpp
Qt Code: 
  1. #include "dialog.h"
  2. #include "ui_dialog.h"
  3. #include "player.h"
  4. #include "zombie.h"
  5.  
  6. #include <QHBoxLayout>
  7. #include <QGraphicsView>
  8. #include <QGraphicsScene>
  9. #include <QSizePolicy>
  10. #include <QPropertyAnimation>
  11. #include <QKeyEvent>
  12. #include <iostream>
  13. #include <QPushButton>
  14.  
  15. using namespace std;
  16.  
  17. Dialog::Dialog(QWidget *parent) :
  18.     QDialog(parent),
  19.     ui(new Ui::Dialog)
  20. {
  21.     ui->setupUi(this);
  22.     this->setMinimumSize(1000, 700);
  23.     this->setMaximumSize(size());
  24.     this->setWindowTitle("Game");
  25.  
  26.     QHBoxLayout *layout = new QHBoxLayout();
  27.     this->setLayout(layout);
  28.  
  30.     view->setRenderHints(QPainter::Antialiasing);
  31.  
  33.     view->setScene(scene);
  34.  
  35.     QBrush backgroundBrush(Qt::white);
  36.     scene->setBackgroundBrush(backgroundBrush);
  37.  
  38.     player *p = new player();
  39.     scene->addItem(p);
  40.  
  41.     zombie *z = new zombie();
  42.     scene->addItem(z);
  43.  
  44.     layout->addWidget(view);
  45.     view->show();
  46. }
  47.  
  48. Dialog::~Dialog()
  49. {
  50.     delete ui;
  51.     qDebug("Dialog Deleted");
  52. }
  53.  
  54. void Dialog::keyPressEvent(QKeyEvent *event){
  55.     switch(event->key()){
  56.     case Qt::Key_W:
  57.         qDebug("Key Pressed: W");
  58.         p->moveUp();
  59.         break;
  60.     case Qt::Key_A:
  61.         qDebug("Key Pressed: A");
  62.         p->moveLeft();
  63.         break;
  64.     case Qt::Key_S:
  65.         qDebug("Key Pressed: S");
  66.         p->moveDown();
  67.         break;
  68.     case Qt::Key_D:
  69.         qDebug("Key Pressed: D");
  70.         p->moveRight();
  71.         break;
  72.     }
  73. }
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main.cpp
Qt Code: 
  1. #include "dialog.h"
  2. #include <QApplication>
  3.  
  4. int main(int argc, char *argv[])
  5. {
  6.     QApplication a(argc, argv);
  7.     Dialog w;
  8.     w.show();
  9.  
  10.     return a.exec();
  11. }
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player.cpp
Qt Code: 
  1. #include "player.h"
  2.  
  3. #include <QGraphicsItem>
  4. #include <QPainter>
  5. #include <QPropertyAnimation>
  6. #include <QObject>
  7.  
  8. player::player()
  9. {
  10.     setFlag(QGraphicsItem::ItemIsMovable);
  11.     qDebug("Player Created");
  12. }
  13.  
  14. QRectF player::boundingRect() const
  15. {
  16.     return QRectF(0, 0, 25, 25);
  17. }
  18.  
  19. void player::paint(QPainter *painter, const QStyleOptionGraphicsItem *options, QWidget *widget)
  20. {
  21.     QRectF rec = boundingRect();
  22.  
  23.     painter->setBrush(Qt::red);
  24.     painter->setPen(Qt::red);
  25.  
  26.     painter->drawEllipse(rec);
  27. }
  28.  
  29. void player::moveUp(){
  30.  
  31. }
  32.  
  33. void player::moveLeft(){
  34.  
  35. }
  36.  
  37. void player::moveDown(){
  38.  
  39. }
  40.  
  41. void player::moveRight(){
  42.  
  43. }
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I really wanted to put the respective animations in the functions moveUp(), moveLeft(), moveDown, moveRight() in the class player. Could you please help me by showing my how to do the animations in these locations.
Also, while I'm here, is there anything I should change to my program while I am not to far into the game?

Thanks
-David