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module AnalogClock;

import qt.core.QPoint;
import qt.core.QTime;
import qt.core.QTimer;

import qt.gui.QWidget;
import qt.gui.QPolygon;
import qt.gui.QColor;
import qt.gui.QPaintEvent;
import qt.gui.QPainter;

import tango.io.Stdout;

class AnalogClock : public QWidget
{
public:
    this(QWidget parent = null)
    {
        super(parent);
        auto timer = new QTimer(this);
        timer.timeout.connect(&this.update);
        timer.start(1000);
        setWindowTitle("Analog Clock");
        resize(200, 200);
    }

    void paintEvent(QPaintEvent event)
    {
        static const QPoint[3] hourHand = [
            QPoint(7, 8),
            QPoint(-7, 8),
            QPoint(0, -40)
        ];
        static const QPoint[3] minuteHand = [
            QPoint(7, 8),
            QPoint(-7, 8),
            QPoint(0, -70)
        ];

        scope hourColor = new QColor(127, 0, 127);
        scope minuteColor = new QColor(0, 127, 127, 191);

        int side = qMin(width(), height());
        QTime time = QTime.currentTime();

        // !! it is important that QPainter object should be scoped
        // !! in order to be destroyed after painting
        scope painter = new QPainter(this);

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

        painter.setPen(Qt.NoPen);
        painter.setBrush(hourColor);

        painter.save();
        painter.rotate(30.0 * ((time.hour() + time.minute() / 60.0)));
        painter.drawConvexPolygon(hourHand);
        painter.restore();

        painter.setPen(hourColor);

        for (int i = 0; i < 12; ++i) {
            painter.drawLine(88, 0, 96, 0);
            painter.rotate(30.0);
        }

        painter.setPen(Qt.NoPen);
        painter.setBrush(minuteColor);

        painter.save();
        painter.rotate(6.0 * (time.minute() + time.second() / 60.0));
        painter.drawConvexPolygon(minuteHand);
        painter.restore();

        painter.setPen(minuteColor);

        for (int j = 0; j < 60; ++j) {
            if ((j % 5) != 0)
                painter.drawLine(92, 0, 96, 0);
            painter.rotate(6.0);
        }
    }
}