QT控件大全四QMeter

效果如下：

核心代码：

#ifndef QMETER_H#define QMETER_H#include <Qt>#include <QWidget>#include <QPropertyAnimation>class QColor;class QMeter : public QWidget{ Q_OBJECTQ_ENUMS(errorCode);Q_PROPERTY(double value READ value WRITE setValue);Q_PROPERTY(double minValue READ minValue WRITE setMinValue);Q_PROPERTY(double maxValue READ maxValue WRITE setMaxValue);Q_PROPERTY(double threshold READ threshold WRITE setThreshold);Q_PROPERTY(int precision READ precision WRITE setPrecision);    Q_PROPERTY(int precisionNumeric READ precisionNumeric WRITE setPrecisionNumeric);Q_PROPERTY(QString units READ units WRITE setUnits);    Q_PROPERTY(QString label READ label WRITE setLabel);    Q_PROPERTY(int steps READ steps WRITE setSteps);Q_PROPERTY(double startAngle READ startAngle WRITE setStartAngle);Q_PROPERTY(double endAngle READ endAngle WRITE setEndAngle);Q_PROPERTY(QColor foreground READ foreground WRITE setForeground);Q_PROPERTY(QColor background READ background WRITE setBackground);Q_PROPERTY(bool enableThreshold READ enableThreshold WRITE setThresholdEnabled);    Q_PROPERTY(double beginValidValue READ beginValidValue WRITE setBeginValidValue);    Q_PROPERTY(double endValidValue READ endValidValue WRITE setEndValidValue);    Q_PROPERTY(bool enableValidWindow READ enableValidWindow WRITE setEnableValidWindow);    Q_PROPERTY(double beginWarningValue READ beginWarningValue WRITE setBeginWarningValue);    Q_PROPERTY(double endWarningValue READ endWarningValue WRITE setEndWarningValue);    Q_PROPERTY(bool enableWarningWindow READ enableWarningWindow WRITE setEnableWarningWindow);Q_PROPERTY(bool enableNumericIndicator READ enableNumericIndicator WRITE setNumericIndicatorEnabled);public:     enum ErrorCode {MaxValueError=1,MinValueError,ThresholdError,TargetError,PrecisionError,ColorError,UnitsEmpty,OutOfRange};    QMeter(QWidget *parent = 0);    double value() const { return m_value; }    double minValue() const { return m_minValue; }    double maxValue() const { return m_maxValue; }    double threshold() const { return m_threshold; }    double beginValidValue() const { return m_beginValidValue; }    double endValidValue() const { return m_endValidValue; }    double beginWarningValue() const { return m_beginWarningValue; }    double endWarningValue() const { return m_endWarningValue; }    int precision() const { return m_precision; }    int precisionNumeric() const { return m_precisionNumeric; }    QString units()const { return m_units; }    QString label()const { return m_label; }    int steps() const { return m_steps; }    double startAngle() const { return m_startAngle; }    double endAngle() const { return m_endAngle; }    QColor foreground() const { return m_foreground; }    QColor background() const { return m_background; }    bool enableThreshold() const { return m_thresholdEnabled; }    bool enableValidWindow() const { return m_enableValidWindow; }    bool enableWarningWindow() const { return m_enableWarningWindow; }    bool enableNumericIndicator() const { return m_numericIndicatorEnabled; }signals:    void errorSignal(int);                void thresholdAlarm(bool);public slots:void setValue(double);void setValue(int);void setMinValue(double);void setMinValue(int);void setMaxValue(double);void setMaxValue(int);void setThreshold(double);void setThreshold(int);    void setPrecision(int);    void setPrecisionNumeric(int);  void setUnits(QString);    void setLabel(QString);void setSteps(int);void setStartAngle(double);void setEndAngle(double);void setForeground(QColor);void setBackground(QColor);    void setThresholdEnabled(bool);    void setNumericIndicatorEnabled(bool);    void setValueWithSpringEffect(int value);    void setBeginValidValue(double);    void setEndValidValue(double);    void setEnableValidWindow(bool);    void setBeginWarningValue(double);    void setEndWarningValue(double);    void setEnableWarningWindow(bool);protected:    double m_value;    double m_maxValue, m_minValue;    int m_precision;    int m_precisionNumeric;    void thresholdManager();    void paintEvent(QPaintEvent *event);            void drawCrown(QPainter *painter);    void drawBackground(QPainter *painter);    void drawTicks(QPainter *painter);    void drawScale(QPainter *painter);    void drawUnits(QPainter *painter);    void drawNeedle(QPainter *painter);    void drawThresholdLine(QPainter *painter);    void drawNumericValue(QPainter *painter);    void drawCoverGlass(QPainter *painter);    void drawLabel(QPainter *painter);    void drawValidWindow(QPainter *painter);    void drawWarningWindow(QPainter *painter);    QString m_units;    QString m_label;int m_steps;double m_startAngle,m_endAngle;double m_threshold;    bool m_thresholdFlag;    bool m_enableValidWindow;    double m_beginValidValue, m_endValidValue;        bool m_enableWarningWindow;    double m_beginWarningValue, m_endWarningValue;bool m_thresholdEnabled;bool m_numericIndicatorEnabled;QColor m_foreground;QColor m_background;    QPropertyAnimation m_valAnimation;};#endif

源码工程：：QQ:609162385