Qt编写自定义控件31-面板仪表盘控件 - QTCN开发网

#ifndef GAUGEPANEL_H
#define GAUGEPANEL_H

/**
* 面板仪表盘控件作者:feiyangqingyun(QQ:517216493) 2019-7-3
* 1:可设置范围值,支持负数值
* 2:可设置精确度+刻度尺精确度,最大支持小数点后3位
* 3:可设置大刻度数量/小刻度数量
* 4:可设置开始旋转角度/结束旋转角度
* 5:可设置是否启用动画效果以及动画效果每次移动的步长
* 6:可设置刻度颜色+文字颜色+圆环的宽度和颜色
* 7:自适应窗体拉伸,刻度尺和文字自动缩放
* 8:可设置单位以及仪表盘名称
*/

#include <QWidget>

#ifdef quc
#if (QT_VERSION < QT_VERSION_CHECK(5,7,0))
#include <QtDesigner/QDesignerExportWidget>
#else
#include <QtUiPlugin/QDesignerExportWidget>
#endif

class QDESIGNER_WIDGET_EXPORT GaugePanel : public QWidget
#else
class GaugePanel : public QWidget
#endif

{
    Q_OBJECT
    Q_PROPERTY(double minValue READ getMinValue WRITE setMinValue)
    Q_PROPERTY(double maxValue READ getMaxValue WRITE setMaxValue)
    Q_PROPERTY(double value READ getValue WRITE setValue)
    Q_PROPERTY(int precision READ getPrecision WRITE setPrecision)
    Q_PROPERTY(int scalePrecision READ getScalePrecision WRITE setScalePrecision)

    Q_PROPERTY(int scaleMajor READ getScaleMajor WRITE setScaleMajor)
    Q_PROPERTY(int scaleMinor READ getScaleMinor WRITE setScaleMinor)
    Q_PROPERTY(int startAngle READ getStartAngle WRITE setStartAngle)
    Q_PROPERTY(int endAngle READ getEndAngle WRITE setEndAngle)

    Q_PROPERTY(bool animation READ getAnimation WRITE setAnimation)
    Q_PROPERTY(double animationStep READ getAnimationStep WRITE setAnimationStep)

    Q_PROPERTY(int ringWidth READ getRingWidth WRITE setRingWidth)
    Q_PROPERTY(QColor ringColor READ getRingColor WRITE setRingColor)

    Q_PROPERTY(QColor scaleColor READ getScaleColor WRITE setScaleColor)
    Q_PROPERTY(QColor pointerColor READ getPointerColor WRITE setPointerColor)
    Q_PROPERTY(QColor bgColor READ getBgColor WRITE setBgColor)
    Q_PROPERTY(QColor textColor READ getTextColor WRITE setTextColor)
    Q_PROPERTY(QString unit READ getUnit WRITE setUnit)
    Q_PROPERTY(QString text READ getText WRITE setText)

public:
    explicit GaugePanel(QWidget *parent = 0);
    ~GaugePanel();

protected:
    void paintEvent(QPaintEvent *);
    void drawRing(QPainter *painter);
    void drawScale(QPainter *painter);
    void drawScaleNum(QPainter *painter);
    void drawPointer(QPainter *painter);
    void drawValue(QPainter *painter);

private slots:
    void updateValue();

private:
    double minValue;                //最小值
    double maxValue;                //最大值
    double value;                   //目标值
    int precision;                  //精确度,小数点后几位
    int scalePrecision;             //刻度尺精确度,小数点后几位

    int scaleMajor;                 //大刻度数量
    int scaleMinor;                 //小刻度数量
    int startAngle;                 //开始旋转角度
    int endAngle;                   //结束旋转角度

    bool animation;                 //是否启用动画显示
    double animationStep;           //动画显示时步长

    int ringWidth;                  //圆环宽度
    QColor ringColor;               //圆环颜色

    QColor scaleColor;              //刻度颜色
    QColor pointerColor;            //指针颜色
    QColor bgColor;                 //背景颜色
    QColor textColor;               //文字颜色
    QString unit;                   //单位
    QString text;                   //描述文字

    bool reverse;                   //是否往回走
    double currentValue;            //当前值
    QTimer *timer;                  //定时器绘制动画

public:
    double getMinValue()            const;
    double getMaxValue()            const;
    double getValue()               const;
    int getPrecision()              const;
    int getScalePrecision()         const;

    int getScaleMajor()             const;
    int getScaleMinor()             const;
    int getStartAngle()             const;
    int getEndAngle()               const;

    bool getAnimation()             const;
    double getAnimationStep()       const;

    int getRingWidth()              const;
    QColor getRingColor()           const;

    QColor getScaleColor()          const;
    QColor getPointerColor()        const;
    QColor getBgColor()             const;
    QColor getTextColor()           const;
    QString getUnit()               const;
    QString getText()               const;

    QSize sizeHint()                const;
    QSize minimumSizeHint()         const;

public Q_SLOTS:
    //设置范围值
    void setRange(double minValue, double maxValue);
    void setRange(int minValue, int maxValue);

    //设置最大最小值
    void setMinValue(double minValue);
    void setMaxValue(double maxValue);

    //设置目标值
    void setValue(double value);
    void setValue(int value);

    //设置精确度
    void setPrecision(int precision);
    //设置刻度尺精确度
    void setScalePrecision(int scalePrecision);

    //设置主刻度数量
    void setScaleMajor(int scaleMajor);
    //设置小刻度数量
    void setScaleMinor(int scaleMinor);
    //设置开始旋转角度
    void setStartAngle(int startAngle);
    //设置结束旋转角度
    void setEndAngle(int endAngle);

    //设置是否启用动画显示
    void setAnimation(bool animation);
    //设置动画显示的步长
    void setAnimationStep(double animationStep);

    //设置圆环宽度+颜色
    void setRingWidth(int ringWidth);
    void setRingColor(const QColor &ringColor);

    //设置刻度颜色
    void setScaleColor(const QColor &scaleColor);
    //设置指针颜色
    void setPointerColor(const QColor &pointerColor);
    //设置背景颜色
    void setBgColor(const QColor &bgColor);
    //设置文本颜色
    void setTextColor(const QColor &textColor);
    //设置单位
    void setUnit(const QString &unit);
    //设置中间描述文字
    void setText(const QString &text);

Q_SIGNALS:
    void valueChanged(int value);
};

#endif // GAUGEPANEL_H

void GaugePanel::paintEvent(QPaintEvent *)
{
    int width = this->width();
    int height = this->height();
    int side = qMin(width, height);

    //绘制准备工作,启用反锯齿,平移坐标轴中心,等比例缩放
    QPainter painter(this);
    painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);

    //绘制背景
    if (bgColor != Qt::transparent) {
        painter.setPen(Qt::NoPen);
        painter.fillRect(this->rect(), bgColor);
    }

    painter.translate(width / 2, height / 2);
    painter.scale(side / 200.0, side / 200.0);

    //绘制圆环
    drawRing(&painter);

    //绘制刻度线
    drawScale(&painter);

    //绘制刻度值
    drawScaleNum(&painter);

    //绘制指示器
    drawPointer(&painter);

    //绘制当前值
    drawValue(&painter);
}

void GaugePanel::drawRing(QPainter *painter)
{
    int radius = 70;
    painter->save();

    QPen pen;
    pen.setCapStyle(Qt::FlatCap);
    pen.setWidthF(ringWidth);
    pen.setColor(ringColor);
    painter->setPen(pen);

    radius = radius - ringWidth;
    QRectF rect = QRectF(-radius, -radius, radius * 2, radius * 2);
    double angleAll = 360.0 - startAngle - endAngle;
    painter->drawArc(rect, (270 - startAngle - angleAll) * 16, angleAll * 16);

    painter->restore();
}

void GaugePanel::drawScale(QPainter *painter)
{
    int radius = 80;
    painter->save();

    painter->rotate(startAngle);
    int steps = (scaleMajor * scaleMinor);
    double angleStep = (360.0 - startAngle - endAngle) / steps;

    QPen pen;
    pen.setCapStyle(Qt::RoundCap);
    pen.setColor(scaleColor);

    for (int i = 0; i <= steps; i++) {
        if (i % scaleMinor == 0) {
            pen.setWidthF(1.5);
            painter->setPen(pen);
            painter->drawLine(0, radius - 8, 0, radius + 5);
        } else {
            pen.setWidthF(0.5);
            painter->setPen(pen);
            painter->drawLine(0, radius - 8, 0, radius - 3);
        }

        painter->rotate(angleStep);
    }

    painter->restore();
}

void GaugePanel::drawScaleNum(QPainter *painter)
{
    int radius = 95;
    painter->save();
    painter->setPen(scaleColor);

    double startRad = (360 - startAngle - 90) * (M_PI / 180);
    double deltaRad = (360 - startAngle - endAngle) * (M_PI / 180) / scaleMajor;

    for (int i = 0; i <= scaleMajor; i++) {
        double sina = qSin(startRad - i * deltaRad);
        double cosa = qCos(startRad - i * deltaRad);
        double value = 1.0 * i * ((maxValue - minValue) / scaleMajor) + minValue;

        QString strValue = QString("%1").arg((double)value, 0, 'f', scalePrecision);
        double textWidth = fontMetrics().width(strValue);
        double textHeight = fontMetrics().height();
        int x = radius * cosa - textWidth / 2;
        int y = -radius * sina + textHeight / 4;
        painter->drawText(x, y, strValue);
    }

    painter->restore();
}

void GaugePanel::drawPointer(QPainter *painter)
{
    int radius = 70;
    painter->save();
    painter->setPen(Qt::NoPen);
    painter->setBrush(pointerColor);

    QPolygon pts;
    pts.setPoints(4, -5, 0, 0, -8, 5, 0, 0, radius);

    painter->rotate(startAngle);
    double degRotate = (360.0 - startAngle - endAngle) / (maxValue - minValue) * (currentValue - minValue);
    painter->rotate(degRotate);
    painter->drawConvexPolygon(pts);

    painter->restore();
}

void GaugePanel::drawValue(QPainter *painter)
{
    int radius = 100;
    painter->save();
    painter->setPen(textColor);

    QFont font;
    font.setPixelSize(15);
    painter->setFont(font);

    QString strValue = QString("%1").arg((double)currentValue, 0, 'f', precision);
    strValue = QString("%1 %2").arg(strValue).arg(unit);
    QRectF valueRect(-radius, radius / 3.5, radius * 2, radius / 3.5);
    painter->drawText(valueRect, Qt::AlignCenter, strValue);

    QRectF textRect(-radius, radius / 2.5, radius * 2, radius / 2.5);
    font.setPixelSize(12);
    painter->setFont(font);
    painter->drawText(textRect, Qt::AlignCenter, text);

    painter->restore();
}