Moving an item in QGraphicsScene

[prosass]

Thanks thawkins, but I think it´s not exactly what I need.

I have followed the mice colliding example and I´ve created a timer event:

The .h file:

#ifndef CHIP_H
#define CHIP_H
 
#include <QtGui/QColor>
#include <QtGui/QGraphicsItem>
#include <QObject>
 
class Chip : public QGraphicsItem
{
     Q_OBJECT
 
public:
    Chip(const QColor &color, int x, int y, const QString &tipo, const qreal &ancho, const qreal &alto, const QPixmap &pixmap);
 
    QRectF boundingRect() const;
    QPainterPath shape() const;
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *item, QWidget *widget);
 
protected:
    void mousePressEvent(QGraphicsSceneMouseEvent *event);
    void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
    void timerEvent(QTimerEvent *event);
[/B]
private:
    int x, y;
    QColor color;
	QString tipo;
	QPixmap pixmap;
	qreal ancho;
	qreal alto;
    QList<QPointF> stuff;
};

#ifndef CHIP_H
#define CHIP_H

#include <QtGui/QColor>
#include <QtGui/QGraphicsItem>
#include <QObject>

class Chip : public QGraphicsItem
{
     Q_OBJECT

public:
    Chip(const QColor &color, int x, int y, const QString &tipo, const qreal &ancho, const qreal &alto, const QPixmap &pixmap);

    QRectF boundingRect() const;
    QPainterPath shape() const;
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *item, QWidget *widget);

protected:
    void mousePressEvent(QGraphicsSceneMouseEvent *event);
    void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
    void timerEvent(QTimerEvent *event);
[/B]
private:
    int x, y;
    QColor color;
	QString tipo;
	QPixmap pixmap;
	qreal ancho;
	qreal alto;
    QList<QPointF> stuff;
};

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And in the .cpp file I have reimplemented the timer event:

#include "chip.h"
#include "loc.h"
 
#include <QtGui>
#include <QtSql>
 
 
loc_position_t loc_pos;
 
Chip::Chip(const QColor &color, int x, int y, const QString &tipo, const qreal &ancho, const qreal &alto, const QPixmap &pixmap)
{
    this->x = x;
    this->y = y;
    this->color = color;
    this->tipo = tipo;
    this->ancho = ancho;
    this->alto = alto;
    this->pixmap = pixmap;
 
	setZValue(1);
 
    setFlags(ItemIsSelectable);
    setAcceptsHoverEvents(true);
    startTimer(5000);
 
}
 
...
 
void Chip::timerEvent(QTimerEvent *)
 {
     ...
 }

#include "chip.h"
#include "loc.h"

#include <QtGui>
#include <QtSql>


loc_position_t loc_pos;

Chip::Chip(const QColor &color, int x, int y, const QString &tipo, const qreal &ancho, const qreal &alto, const QPixmap &pixmap)
{
    this->x = x;
    this->y = y;
    this->color = color;
    this->tipo = tipo;
    this->ancho = ancho;
    this->alto = alto;
    this->pixmap = pixmap;

	setZValue(1);

    setFlags(ItemIsSelectable);
    setAcceptsHoverEvents(true);
    startTimer(5000);

}

...

void Chip::timerEvent(QTimerEvent *)
 {
     ...
 }

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Now my problem is I get the error:

:: === chip2, Debug ===
chip.cpp:24: error: `startTimer' undeclared (first use this function)
 
...

:: === chip2, Debug ===
chip.cpp:24: error: `startTimer' undeclared (first use this function)

...

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Why is that? I have rerun qmake and the Q_OBJECT macro is the .h file. I cannot find why the error. Can anyone help?

[jpn]

QGraphicsItem is not a QObject. You would have to use multiple inheritance:

class Chip : public QObject, public QGraphicsItem // QObject must be listed first
{
...
};

class Chip : public QObject, public QGraphicsItem // QObject must be listed first
{
...
};

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Anyway, if you plan to construct any kind of animation, I suggest using QGraphicsItemAnimation.

[prosass]

Thanks jpn, that solved the problem!