Play a simple .gif-animation and KeyEvent-question :)

[Technopia]

Hello! I am trying to learn how to create a simple game following some nice tutorials on Youtube. I have two questions:

1. There is nothing wrong with the "moving code" I use. It does exacly what I tell it to do. I want to learn how to NOT make the player stop moving to the left or right when I click the spacebutton to shoot

void Player::keyPressEvent(QKeyEvent *event){
    // move the player left and right
    if (event->key() == Qt::Key_Left){
        if (pos().x() > 0)
        setPos(x()-10,y());
    }
    else if (event->key() == Qt::Key_Right){
        if (pos().x() + 100 < 800)
        setPos(x()+10,y());
    }
    // shoot with the spacebar
    else if (event->key() == Qt::Key_Space){
        // create a bullet
        Projectile * projectile = new Projectile();
        projectile->setPos(x()+35,y());
        scene()->addItem(projectile);
    }
}

void Player::keyPressEvent(QKeyEvent *event){
    // move the player left and right
    if (event->key() == Qt::Key_Left){
        if (pos().x() > 0)
        setPos(x()-10,y());
    }
    else if (event->key() == Qt::Key_Right){
        if (pos().x() + 100 < 800)
        setPos(x()+10,y());
    }
    // shoot with the spacebar
    else if (event->key() == Qt::Key_Space){
        // create a bullet
        Projectile * projectile = new Projectile();
        projectile->setPos(x()+35,y());
        scene()->addItem(projectile);
    }
}

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2. How to play add and play a simple .gif-animation. I use the following code (a sample) with no errors, but nothing appears in my window:

QLabel *gif_anim = new QLabel();
        QMovie *movie = new QMovie("C:/Users/Technopia/Desktop/banana.gif"); //Everybody love bananas :cool:
        gif_anim->setMovie(movie);
        movie->start();

QLabel *gif_anim = new QLabel();
        QMovie *movie = new QMovie("C:/Users/Technopia/Desktop/banana.gif"); //Everybody love bananas :cool:
        gif_anim->setMovie(movie);
        movie->start();

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Thanks

[anda_skoa]

1. There is nothing wrong with the "moving code" I use. It does exacly what I tell it to do. I want to learn how to NOT make the player stop moving to the left or right when I click the spacebutton to shoot

Then you probably don't want to move on key press, but as long as they is pressed.
E.g. by starting a timer in key press, moving in the slot connected to the timer's timeout() signal, and stopping the timer in key released.

2. How to play add and play a simple .gif-animation. I use the following code (a sample) with no errors, but nothing appears in my window:

QLabel *gif_anim = new QLabel();
        QMovie *movie = new QMovie("C:/Users/Technopia/Desktop/banana.gif"); //Everybody love bananas :cool:
        gif_anim->setMovie(movie);
        movie->start();

QLabel *gif_anim = new QLabel();
        QMovie *movie = new QMovie("C:/Users/Technopia/Desktop/banana.gif"); //Everybody love bananas :cool:
        gif_anim->setMovie(movie);
        movie->start();

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Do you show() the label?

Cheers,
_

[Technopia]

Thanks for reply I got the .gif-animation to show up. However in a new window. I am a beginner at this so I have difficult how the structures should be built. I am trying to show an animation if player reach a certain score, and I tried to implent the scoreAnimation function in my main score-function. However it gives me alot of errors. I do think im on right track tho and need a bit of push. Check #code comments for my thought.

Score.h

#ifndef SCORE_H
#define SCORE_H
 
#include <QGraphicsTextItem>
#include <QLabel> // I guess QLabel must be included here
#include <QMovie> // I guess QMovie must be included here
 
class Score: public QGraphicsTextItem{ <-- should I add "public: QLabel" and "public: QMovie" here?
public:
    Score(QGraphicsItem * parent=0);
    //Do I need to add -> Score(QLabel * label) here?
    //Do I need to add -> Score(QMovie * movie) here?
    void increase();
    int getScore();
    //int scoreAnimation(); <- This needs to be here I guess
private:
    int score;
};
 
#endif // SCORE_H

#ifndef SCORE_H
#define SCORE_H

#include <QGraphicsTextItem>
#include <QLabel> // I guess QLabel must be included here
#include <QMovie> // I guess QMovie must be included here

class Score: public QGraphicsTextItem{ <-- should I add "public: QLabel" and "public: QMovie" here?
public:
    Score(QGraphicsItem * parent=0);
    //Do I need to add -> Score(QLabel * label) here?
    //Do I need to add -> Score(QMovie * movie) here?
    void increase();
    int getScore();
    //int scoreAnimation(); <- This needs to be here I guess
private:
    int score;
};

#endif // SCORE_H

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#include "score.h"
#include <QFont>
#include <QDebug>
#include <QLabel>
#include <QMovie>
#include <QtGui>
 
Score::Score(QGraphicsItem *parent): QGraphicsTextItem(parent){
    score = 0;
 
    setPlainText(QString("Score: ") + QString::number(score));
    setDefaultTextColor(Qt::yellow);
    setFont(QFont("times",16));
}
 
void Score::increase(){
    score++;
    scoreAnimation(); // <--- Here I call another function
    setPlainText(QString("Score: ") + QString::number(score)); 
}
 
int Score::getScore(){
    return score;
}
 
int Score::scoreAnimation(){
    switch(score){
      case 1:
        /* This is the part I try to add an animation. I guess i need to set loopcount to one also. This code gives me alot of errors and im not sure how to structure it up :D
              qDebug() << "10 Score to Gryffindor!";
              QLabel* label = new QLabel();
              QMovie *movie = new QMovie(":/images/C:/Users/Damien/Desktop/test.gif");
              label->setMovie(movie);
              movie->start();
              label->show();
        */
        break;
      default:
        break;
    }
    return 0;
}

#include "score.h"
#include <QFont>
#include <QDebug>
#include <QLabel>
#include <QMovie>
#include <QtGui>

Score::Score(QGraphicsItem *parent): QGraphicsTextItem(parent){
    score = 0;

    setPlainText(QString("Score: ") + QString::number(score));
    setDefaultTextColor(Qt::yellow);
    setFont(QFont("times",16));
}

void Score::increase(){
    score++;
    scoreAnimation(); // <--- Here I call another function
    setPlainText(QString("Score: ") + QString::number(score)); 
}

int Score::getScore(){
    return score;
}

int Score::scoreAnimation(){
    switch(score){
      case 1:
        /* This is the part I try to add an animation. I guess i need to set loopcount to one also. This code gives me alot of errors and im not sure how to structure it up :D
              qDebug() << "10 Score to Gryffindor!";
              QLabel* label = new QLabel();
              QMovie *movie = new QMovie(":/images/C:/Users/Damien/Desktop/test.gif");
              label->setMovie(movie);
              movie->start();
              label->show();
        */
        break;
      default:
        break;
    }
    return 0;
}

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Thanks. An explanation would give me a great amount of understanding about how the structure works.

[anda_skoa]

Ah, I see.

So, the animation showed up in a separate window because the label you are using has no parent.
A QWidget without a parent becomes a window by itself.

From your new code I take it you want the animation inside a QGraphicsScene.
For that you need a slightly different approach.

Create your own animation item, by deriving from QObject and QGraphicsPixmapItem.
Let it have a QMovie as a member or provide the QMovie via a setter and store the pointer to it as a member.

In either case make the item show the movie's currentPixmap().

Also connect to the movie's frameChanged() signal to a slot that calls update() on the item.

Cheers,
_