如何计算两个Qpolygon之间的最小距离

计算两个 QPolygon 之间的最小距离可以使用 QPolygonF 类的 boundingRect() 函数来获取两个多边形的外接矩形，然后使用 QRectF 类的函数 intersected() 来获取两个多边形的相交矩形，最后使用 QPolygonF 类的函数 distanceToLine() 来计算两个多边形之间的最小距离。

具体实现代码如下：

#include <QPolygonF>
#include <QRectF>

double minDistanceBetweenPolygons(const QPolygonF& polygon1, const QPolygonF& polygon2)
{
    QRectF rect1 = polygon1.boundingRect();
    QRectF rect2 = polygon2.boundingRect();
    QRectF intersectedRect = rect1.intersected(rect2);

    double minDistance = std::numeric_limits<double>::max();
    for (int i = 0; i < polygon1.size(); ++i) {
        for (int j = 0; j < polygon2.size(); ++j) {
            QLineF line(polygon1[i], polygon2[j]);
            double distance = line.length();
            if (distance < minDistance) {
                minDistance = distance;
            }
        }
    }

    for (int i = 0; i < polygon1.size(); ++i) {
        QLineF line(polygon1[i], polygon1[(i + 1) % polygon1.size()]);
        double distance = line.length();
        if (distance < minDistance) {
            minDistance = distance;
        }
    }

    for (int i = 0; i < polygon2.size(); ++i) {
        QLineF line(polygon2[i], polygon2[(i + 1) % polygon2.size()]);
        double distance = line.length();
        if (distance < minDistance) {
            minDistance = distance;
        }
    }

    for (int i = 0; i < polygon1.size(); ++i) {
        for (int j = 0; j < polygon2.size(); ++j) {
            QLineF line(polygon1[i], polygon2[j]);
            QPointF point;
            line.intersect(intersectedRect, &point);
            double distance = QLineF(polygon1[i], point).length();
            if (distance < minDistance) {
                minDistance = distance;
            }
        }
    }

    return minDistance;
}

注意：这段代码是 C++ 代码，需要在 Qt 环境下编译运行。