Question

我有一个棋盘，我想在鼠标释放时访问我的项目。我知道它的位置，我想从场景中删除它或找到它的颜色。我在文档中搜索但是没有找到任何有用的东西。我的项目继承自QGraphicsPixmapItem。我怎么能这样做？

这是我的.cpp文件

knight::knight()
{
boundingRect();
setFlag(ItemIsSelectable);

 _target=new QGraphicsPixmapItem[8];


}

QRectF knight::boundingRect()
{
 return QRectF (0,0,140,140);


}

void knight::target(QPointF location)
{

for (int i=0;i<8;i++)
{
    pointarray[i].setX(5);//hamintori 5 gozashtam ;

}
qreal x ,y,xarray[4],yarray[4];
{
x=location.x();
y=location.y();
xarray[0]=x+280;
xarray[1]=x-280;
xarray[2]=x+140;
xarray[3]=x-140;
yarray[0]=y+280;
yarray[1]=y-280;
yarray[2]=y+140;
yarray[3]=y-140;
}

for (int i=0;i<4;i++)
    {
    if (xarray[i]>=980 && xarray[i]<0)
        xarray[i]=5;
    if (yarray[i]>=980 && xarray[i]<0)
        yarray[i]=5;
    }
 if (xarray[0]!=5)
 {
 pointarray[0].setX(xarray[0]);
 pointarray[1].setX(xarray[0]);

if (yarray[2]!=5)
 pointarray[0].setY(yarray[2]);

    if (yarray[3]!=5)
   pointarray[1].setX(yarray[3]);


 }
 if (xarray[1]!=5)
 {
 pointarray[2].setX(xarray[1]);
 pointarray[3].setX(xarray[1]);
if (yarray[2]!=5)
 pointarray[2].setY(yarray[2]);
if (yarray[3]!=5)
   pointarray[3].setX(yarray[3]);
 }
  if (xarray[2]!=5)
 {
 pointarray[4].setX(xarray[2]);
 pointarray[5].setX(xarray[2]);

    if (yarray[0]!=5)
 pointarray[4].setY(yarray[0]);

if (yarray[1]!=5)
   pointarray[5].setX(yarray[1]);

 }
 if (xarray[3]!=5)
 {
 pointarray[6].setX(xarray[3]);
 pointarray[7].setX(xarray[3]);

if (yarray[0]!=5)
 pointarray[6].setY(yarray[0]);


if (yarray[1]!=5)
   pointarray[7].setX(yarray[1]);

 }

board _board;
QPixmap imagetarget(":/images/target.png");

 for (int i=0;i<8;i++)
    {
        if (pointarray[i].y()!=5)
            {
            (_target+i)->setPixmap(imagetarget);
            (_target+i)->setPos(pointarray[i]);
            (_target+i)->boundingRect();
            // qDebug() <<pointarray[i];
            (_target+i)->setParentItem(_board.boarditem);
            this->scene()->addItem(_target+i);


        }
    }
}

void knight::mousePressEvent(QGraphicsSceneMouseEvent *event)
 {
location=event->scenePos();


location=locationset(location);
target(location);


 QGraphicsPixmapItem::mousePressEvent(event);

}

 void knight::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
 {
int contain;
for (int i=0;i<8;i++)
{
this->scene()->removeItem(_target+i);
}
 targetlocation=event->scenePos();
 targetlocation=locationset(targetlocation);
     for (int i=0;i<8;i++)
 {
     if (targetlocation==pointarray[i])
         contain=1;
 }
 if (contain==1)
     this->setPos(targetlocation);
 else
     this->setPos(location);
 }

void knight::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
  this->setPos(event->scenePos());
}



 QPointF knight::locationset(QPointF location)
 {
int x,y;
x=location.x();
y=location.y();
x=x/140;
x=x*140;
y=y/140;
y=y*140;
location.setX(x);
location.setY(y);
return location;
 }

对我的英语和代码感到抱歉......我刚开始学习C ++和Qt以及英语：）

如何仅使用其位置访问场景中的项目

0 个答案: