cockpit_grid.cpp

QWT5.01用于Qt开发的二维图形库程序

#include <qlayout.h>
#include <qtimer.h>
#include <qwt_analog_clock.h>
#include "attitude_indicator.h"
#include "speedo_meter.h"
#include "cockpit_grid.h"

#if QT_VERSION < 0x040000
typedef QColorGroup Palette;
#else
typedef QPalette Palette;
#endif

CockpitGrid::CockpitGrid(QWidget *parent):
    QFrame(parent)
{
#if QT_VERSION >= 0x040100
    setAutoFillBackground(true);
#endif

    setPalette(colorTheme(QColor(Qt::darkGray).dark(150)));

    QGridLayout *layout = new QGridLayout(this);
    layout->setSpacing(5);
    layout->setMargin(0);

    int i;
    for ( i = 0; i < 3; i++ )
    {
        QwtDial *dial = createDial(i);
        layout->addWidget(dial, 0, i);
    }

#if QT_VERSION < 0x040000
    for ( i = 0; i < layout->numCols(); i++ )
        layout->setColStretch(i, 1);
#else
    for ( i = 0; i < layout->columnCount(); i++ )
        layout->setColumnStretch(i, 1);
#endif
}

QwtDial *CockpitGrid::createDial(int pos)
{
    QwtDial *dial = NULL;
    switch(pos)
    {
        case 0:
        {
            d_clock = new QwtAnalogClock(this);

            const QColor knobColor = QColor(Qt::gray).light(130);

            for ( int i = 0; i < QwtAnalogClock::NHands; i++)
            {
                QColor handColor = QColor(Qt::gray).light(150);
                int width = 8;

                if ( i == QwtAnalogClock::SecondHand )
                {
                    handColor = Qt::gray;
                    width = 5;
                }
                
                QwtDialSimpleNeedle *hand = new QwtDialSimpleNeedle(
                    QwtDialSimpleNeedle::Arrow, true, handColor, knobColor);
                hand->setWidth(width);

                d_clock->setHand((QwtAnalogClock::Hand)i, hand);
            }

            QTimer *timer = new QTimer(d_clock);
            timer->connect(timer, SIGNAL(timeout()), 
                d_clock, SLOT(setCurrentTime()));
            timer->start(1000);

            dial = d_clock;
            break;
        }
        case 1:
        {
            d_speedo = new SpeedoMeter(this);
            d_speedo->setRange(0.0, 240.0);
            d_speedo->setScale(-1, 2, 20);

            QTimer *timer = new QTimer(d_speedo);
            timer->connect(timer, SIGNAL(timeout()), 
                this, SLOT(changeSpeed()));
            timer->start(50);

            dial = d_speedo;
            break;
        }
        case 2:
        {
            d_ai = new AttitudeIndicator(this);

            QTimer *gradientTimer = new QTimer(d_ai);
            gradientTimer->connect(gradientTimer, SIGNAL(timeout()), 
                this, SLOT(changeGradient()));
            gradientTimer->start(100);

            QTimer *angleTimer = new QTimer(d_ai);
            angleTimer->connect(angleTimer, SIGNAL(timeout()), 
                this, SLOT(changeAngle()));
            angleTimer->start(100);

            dial = d_ai;
            break;
        }

    }

    if ( dial )
    {
        dial->setReadOnly(true);
        dial->scaleDraw()->setPenWidth(3);
        dial->setLineWidth(4);
        dial->setFrameShadow(QwtDial::Sunken);
    }
    return dial;
}

QPalette CockpitGrid::colorTheme(const QColor &base) const
{
    const QColor background = base.dark(150);
    const QColor foreground = base.dark(200);

    const QColor mid = base.dark(110);
    const QColor dark = base.dark(170);
    const QColor light = base.light(170);
    const QColor text = foreground.light(800);

    QPalette palette;
    for ( int i = 0; i < QPalette::NColorGroups; i++ )
    {
        QPalette::ColorGroup cg = (QPalette::ColorGroup)i;

        palette.setColor(cg, Palette::Base, base);
        palette.setColor(cg, Palette::Background, background);
        palette.setColor(cg, Palette::Mid, mid);
        palette.setColor(cg, Palette::Light, light);
        palette.setColor(cg, Palette::Dark, dark);
        palette.setColor(cg, Palette::Text, text);
        palette.setColor(cg, Palette::Foreground, foreground);
    }

    return palette;
}

void CockpitGrid::changeSpeed()
{
    static double offset = 0.8;

    double speed = d_speedo->value();

    if ( (speed < 40.0 && offset < 0.0 ) ||  
        (speed > 160.0 && offset > 0.0) )
    {
        offset = -offset;
    }

    static int counter = 0;
    switch(counter++ % 12 )
    {
        case 0:
        case 2:
        case 7:
        case 8:
            break;
        default:
            d_speedo->setValue(speed + offset);
    }
}

void CockpitGrid::changeAngle()
{
    static double offset = 0.05;

    double angle = d_ai->angle();
    if ( angle > 180.0 )
        angle -= 360.0;

    if ( (angle < -5.0 && offset < 0.0 ) ||
        (angle > 5.0 && offset > 0.0) )
    {
        offset = -offset;
    }

    d_ai->setAngle(angle + offset);
}

void CockpitGrid::changeGradient()
{
    static double offset = 0.005;

    double gradient = d_ai->gradient();

    if ( (gradient < -0.05 && offset < 0.0 ) ||
        (gradient > 0.05 && offset > 0.0) )
    {
        offset = -offset;
    }

    d_ai->setGradient(gradient + offset);
}