#include <QtWidgets>

class DashboardWidget : public QWidget {
public:
    DashboardWidget(QWidget *parent = nullptr) : QWidget(parent) {
        currentValue = 0;
        showText = "100%";
        setMinimumSize(80, 80);
        setMaximumSize(100, 100);
    }

    void setCurrentPercentage(int value) {
        if (value*3.6 != currentValue) {
            currentValue = value*3.6;
            showText = QString::number(100-value) + "%";
            update();
        }
    }
    void setCurrentValue(int value) {
        if (value != currentValue) {
            currentValue = value;
            showText = QString::number((360-value)/360)+ "%";
            update();
        }
    }

protected:
    void paintEvent(QPaintEvent* event) override {
        int startAngle = 90;
        int endAngle = currentValue+ startAngle-1;

        QPainter painter(this);
        painter.setRenderHint(QPainter::Antialiasing);
        painter.setRenderHint(QPainter::TextAntialiasing);

        int side = qMin(width(), height());

        // 绘制外框
        painter.setPen(QPen(QColor(255, 255, 255), 2));
        painter.setBrush(Qt::NoBrush);
        painter.drawEllipse(width() / 2 - side / 2 + 1, height() / 2 - side / 2 + 1, side - 2, side - 2);

        // 绘制指针
        painter.save();
        painter.translate(width() / 2, height() / 2);
        painter.rotate(currentValue); // 假设每个刻度代表10个单位，360度/10 = 36度
        

        // 绘制顺时针渐变绿色区域
        QRadialGradient greenGradient(QPointF(0, 0), side / 2);
        greenGradient.setColorAt(0.70, Qt::transparent);
        greenGradient.setColorAt(0.96, QColor(76, 255, 76));
        greenGradient.setColorAt(1, QColor(76 ,255,76));
        painter.setPen(QPen(Qt::transparent, 20));
        painter.setBrush(greenGradient);
        painter.drawEllipse(QPointF(0, 0), side / 2-2, side / 2-2);

        // 绘制逆时针渐变红色区域
        if (currentValue > 0) {
            QRadialGradient redGradient(QPointF(0, 0), side / 2);
            redGradient.setColorAt(0.80, Qt::transparent);
            redGradient.setColorAt(0.80, QColor(255, 76, 76));
            redGradient.setColorAt(1, QColor(255, 76, 76));
            painter.setPen(QPen(Qt::transparent, 20));
            painter.setBrush(redGradient);
            painter.drawPie(QRectF(-side / 2+2, -side / 2+2, side -4, side-4), startAngle * 16, (endAngle - startAngle) * 16);
        }

        // 使用渐变来绘制指针
        QLinearGradient gradient(QPointF(-2, -side / 2), QPointF(2, -side / 2 ));
        gradient.setColorAt(0, Qt::transparent);    
        gradient.setColorAt(0.8, Qt::white);
        gradient.setColorAt(1, Qt::white);
        painter.setPen(QPen(Qt::transparent, 3));
        painter.setBrush(gradient);
        painter.drawConvexPolygon(QPolygonF() << QPointF(-2, -side / 2) << QPointF(2, -side / 2) << QPointF(0, -side / 2 + 40));

        painter.restore();

        // 显示当前值
        QFont font("Impact", 24, QFont::Bold);
        font.setStretch(130);

        painter.setPen(Qt::white);
        painter.setFont(font);
       
        painter.drawText(QRect(2,-2, side, side), Qt::AlignCenter, showText);
    }



private:
    int currentValue;
    QString Title;
    QString showText;
};