QMap排序方法运用实例

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QVector<QPointF> ReadSonicPoint::sortSonicPoint(QVector<QPointF> befPointVector) //把x轴的值从小到大排序
{
	QVector<QPointF> modPointVector;
	QMap<double, double>sonicMap; //利用QMap自动排序
	for (int i = 0; i < befPointVector.size(); i++)
	{
		sonicMap.insert(befPointVector[i].x(), befPointVector[i].y());
	}
	QMap<double, double>::Iterator it = sonicMap.begin();
	while (it!=sonicMap.end())
	{
		QPointF sonicPoint;
		sonicPoint.setX(it.key());
		sonicPoint.setY(it.value());
		modPointVector.append(sonicPoint);
        i++;
	}
	return modPointVector;
}