qt/LedOK/player/eleanaclock.cpp

#include "eleanaclock.h"
#include <QJsonObject>
#include <QPainter>
#include <QtMath>

EleAnaClock::EleAnaClock(QString path, const QJsonObject &layer, QWidget *parent) : QWidget{parent} {
    timeZone = QTimeZone(layer["timezone"].toString().toUtf8());
    img.load(path);
    pinHourColor = layer["pinHourColor"].toString();
    pinMinColor = layer["pinMinColor"].toString();
    pinSecColor = layer["pinSecColor"].toString();
}

void EleAnaClock::cal() {
    QTime time = QDateTime::currentDateTime().toTimeZone(timeZone).time();
    double rad = time.second()*M_PI/30;
    double rsin = sin(rad);
    double rcos = cos(rad);
    double sideLen = width();
    if(height() < sideLen) sideLen = height();
    sPath = QPainterPath(QPointF(sideLen*0.55*rsin, sideLen*-0.55*rcos));
    double pinWidth = sideLen/36;
    double sx = pinWidth*rcos;
    double sy = pinWidth*rsin;
    sPath.lineTo(sx, sy);
    sPath.lineTo(-sx, -sy);
    sPath.closeSubpath();

    rad = time.minute()*M_PI/30 + rad/60;
    rsin = sin(rad);
    rcos = cos(rad);
    mPath = QPainterPath(QPointF(sideLen*0.45*rsin, sideLen*-0.45*rcos));
    pinWidth = sideLen/30;
    sx = pinWidth*rcos;
    sy = pinWidth*rsin;
    mPath.lineTo(sx, sy);
    mPath.lineTo(-sx, -sy);
    mPath.closeSubpath();

    rad = time.hour()*M_PI/6 + rad/12;
    rsin = sin(rad);
    rcos = cos(rad);
    hPath = QPainterPath(QPointF(sideLen*0.3*rsin, sideLen*-0.3*rcos));
    pinWidth = sideLen/18;
    sx = pinWidth*rcos;
    sy = pinWidth*rsin;
    hPath.lineTo(sx, sy);
    hPath.lineTo(-sx, -sy);
    hPath.closeSubpath();
}
void EleAnaClock::paintEvent(QPaintEvent *) {
    if(timerId==0) {
        timerId = startTimer(1000, Qt::PreciseTimer);
        cal();
    }
    QPainter painter(this);
    painter.setRenderHints(QPainter::Antialiasing|QPainter::SmoothPixmapTransform);
    if(! img.isNull()) painter.drawPixmap(0, 0, width(), height(), img);
    painter.translate(width()/2, height()/2);
    painter.fillPath(hPath, QBrush(pinHourColor));
    painter.fillPath(mPath, QBrush(pinMinColor));
    painter.fillPath(sPath, QBrush(pinSecColor));
    painter.translate(-width()/2, -height()/2);
}

void EleAnaClock::timerEvent(QTimerEvent *) {
    if(isVisible()) {
        cal();
        repaint();
    } else if(timerId!=0) {
        killTimer(timerId);
        timerId = 0;
    }
}