I can't create an animated sprite with Qt C++

Cold_Distance

Hi, I'm trying to make a little animated sprite, but don't get it. I read something about QPainter but I don't find any example related with the thing I want to do.

These are the three files of the project:

spriter.h:

#ifndef SPRITER_H
#define SPRITER_H

#include <QObject>
#include <QGraphicsPixmapItem>
#include <QImage>

class spriter: public QObject, public QGraphicsPixmapItem {
    Q_OBJECT
public:
    spriter(QGraphicsItem * parent=0);
    QPixmap sprite;
    QPixmap sheet;
public slots:
    void move();
public slots:
    void animar();
};

#endif // SPRITER_H

spriter.cpp:

#include "spriter.h"
#include <QTimer>
#include <QGraphicsScene>
#include <stdlib.h>
#include <QDebug>
#include <QPainter>


spriter::spriter(QGraphicsItem *parent) : QObject(), QGraphicsPixmapItem(parent)
{
    setPos(200,200); 

    sheet = QPixmap(":/dragon.png");
    sprite = sheet.copy(0, 0, 64, 64);
    //setPixmap(sprite);
    //animar(sheet,sprite);

    QTimer *temporizador = new QTimer();
    connect(temporizador,SIGNAL(timeout()),this,SLOT(move()));
    connect(temporizador,SIGNAL(timeout()),this,SLOT(animar()));
    temporizador->start(60);
}

void spriter::animar() {

    for(int i=0; i<(sheet.width()/sprite.width()); i++){
        setPixmap(QPixmap(sheet.copy(i*sprite.width(), 0, 64, 64)));
    }
    for(int i=(sheet.width()/sprite.width())-1; i>0; i--){
        setPixmap(QPixmap(sheet.copy(i*sprite.width(), 0, 64, 64)));
    }
}


void spriter::move()
{

    setPos(x()+5, y());

    if(x() >= 1000){
        setPos(200, y());
    }

}

main.cpp:

#include <QApplication>
#include <QGraphicsScene>
#include <QGraphicsView>
#include "spriter.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    // create a scene
    QGraphicsScene * scene = new QGraphicsScene();

    spriter *cosilla = new spriter();
    scene->addItem(cosilla);

    // add a view to visualize the scene
    QGraphicsView * view = new QGraphicsView(scene); 

    view->show();
    view->setFixedSize(800,600); 
    scene->setSceneRect(0,0, 798,580); 

    return a.exec();
}

I will be very grateful if someone helps me to solve this problem.

SGaist

Hi,

The first thing that comes to mind is that you are blocking the event loop with your for loop in move. You should rather use a QTimer to trigger the move a regular interval.

On a side note, you are leaking your view in main.