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Thread: I need help with QPropertyAnimation

  1. #1
    Join Date
    Jun 2013
    Posts
    1
    Qt products
    Qt5
    Platforms
    MacOS X Windows

    Default I need help with QPropertyAnimation

    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();
    19. player *p;
    20. zombie *z;
    21. void keyPressEvent(QKeyEvent *event);
    22. private:
    23. Ui::Dialog *ui;
    24. };
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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.  
    29. view->setRenderHints(QPainter::Antialiasing);
    30.  
    31. view->setScene(scene);
    32.  
    33. QBrush backgroundBrush(Qt::white);
    34. scene->setBackgroundBrush(backgroundBrush);
    35.  
    36. player *p = new player();
    37. scene->addItem(p);
    38.  
    39. zombie *z = new zombie();
    40. scene->addItem(z);
    41.  
    42. layout->addWidget(view);
    43. view->show();
    44. }
    45.  
    46. Dialog::~Dialog()
    47. {
    48. delete ui;
    49. qDebug("Dialog Deleted");
    50. }
    51.  
    52. void Dialog::keyPressEvent(QKeyEvent *event){
    53. switch(event->key()){
    54. case Qt::Key_W:
    55. qDebug("Key Pressed: W");
    56. p->moveUp();
    57. break;
    58. case Qt::Key_A:
    59. qDebug("Key Pressed: A");
    60. p->moveLeft();
    61. break;
    62. case Qt::Key_S:
    63. qDebug("Key Pressed: S");
    64. p->moveDown();
    65. break;
    66. case Qt::Key_D:
    67. qDebug("Key Pressed: D");
    68. p->moveRight();
    69. break;
    70. }
    71. }
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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

  2. #2
    Join Date
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    Default Re: I need help with QPropertyAnimation

    I don't see how you can use QPropertyAnimation on your player class because it has no properties exposed. You would need to derive from QGraphicsObject which would give you a pos property to work with.

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