我有两个QGraphicsPixmapItem
,它们的边缘都是透明的,并且它们不是矩形的。当我尝试使用QGraphicsItem::collidingItems()
时,它仅检查其边界矩形是否正在碰撞。有没有办法只检测非透明零件的碰撞?
最佳答案
您必须将形状模式设置为 QGraphicsPixmapItem::HeuristicMaskShape
:
your_item->setShapeMode(QGraphicsPixmapItem::HeuristicMaskShape);
例:
main.cpp
#include <QApplication>
#include <QGraphicsPixmapItem>
#include <QGraphicsView>
#include <QDebug>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QGraphicsView w;
QGraphicsScene *scene = new QGraphicsScene;
w.setScene(scene);
QList<QGraphicsPixmapItem *> items;
for(const QString & filename: {":/character.png", ":/owl.png"}){
QGraphicsPixmapItem *item = scene->addPixmap(QPixmap(filename));
item->setShapeMode(QGraphicsPixmapItem::HeuristicMaskShape);
item->setFlag(QGraphicsItem::ItemIsMovable, true);
item->setFlag(QGraphicsItem::ItemIsSelectable, true);
items<<item;
}
items[1]->setPos(50, 22);
if(items[0]->collidingItems().isEmpty())
qDebug()<<"there is no intersection";
w.show();
return a.exec();
}
输出:
there is no intersection
完整的示例可以在以下link中找到