qt向qml传递5*1024个点
时间: 2023-11-27 10:02:27 浏览: 140
qt实现游戏24点计算
你可以使用QML中的JavaScript数组来传递5*1024个点。以下是一个示例:
1. 首先,在C++中创建一个QList<QPointF>,并将其作为属性添加到QObject中:
```cpp
class MyObject : public QObject
{
Q_OBJECT
Q_PROPERTY(QList<QPointF> points READ points WRITE setPoints NOTIFY pointsChanged)
public:
QList<QPointF> points() const;
void setPoints(const QList<QPointF>& points);
signals:
void pointsChanged();
private:
QList<QPointF> m_points;
};
QList<QPointF> MyObject::points() const
{
return m_points;
}
void MyObject::setPoints(const QList<QPointF>& points)
{
if (m_points != points) {
m_points = points;
emit pointsChanged();
}
}
```
2. 在C++中创建一个MyObject实例,并将其设置为QML上下文的属性:
```cpp
MyObject* myObject = new MyObject();
myObject->setPoints(/* your list of 5*1024 points */);
QQmlContext* context = engine.rootContext();
context->setContextProperty("myObject", myObject);
```
3. 在QML中引用该属性,并将其传递给JavaScript数组:
```qml
import QtQuick 2.0
Item {
property var points: myObject.points
Component.onCompleted: {
var jsArray = []
for (var i = 0; i < points.length; i++) {
jsArray.push([points[i].x, points[i].y])
}
// Use jsArray as needed
}
}
```
在此示例中,我们将QList<QPointF>转换为一个包含[x, y]数组的JavaScript数组。您可以根据需要修改此代码以满足您的需求。
阅读全文