compass_grid.cpp

QWT5.01用于Qt开发的二维图形库程序

#include <qlayout.h>
#include <qwt_compass.h>
#include <qwt_compass_rose.h>
#include <qwt_dial_needle.h>
#include "compass_grid.h"

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

CompassGrid::CompassGrid(QWidget *parent):
    QFrame(parent)
{
#if QT_VERSION < 0x040000
    setBackgroundColor(Qt::gray);
#else
    QPalette p = palette();
    p.setColor(backgroundRole(), Qt::gray);
    setPalette(p);
#endif

#if QT_VERSION >= 0x040100
    setAutoFillBackground(true);
#endif

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

    int i;
    for ( i = 0; i < 6; i++ )
    {
        QwtCompass *compass = createCompass(i);
        layout->addWidget(compass, i / 3, i % 3);
    }

#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
}

QwtCompass *CompassGrid::createCompass(int pos)
{
    int c;

    Palette colorGroup;
    for ( c = 0; c < Palette::NColorRoles; c++ )
        colorGroup.setColor((Palette::ColorRole)c, QColor());

#if QT_VERSION < 0x040000
    colorGroup.setColor(Palette::Base, backgroundColor().light(120));
#else
    colorGroup.setColor(Palette::Base,
        palette().color(backgroundRole()).light(120));
#endif
    colorGroup.setColor(Palette::Foreground, 
        colorGroup.color(Palette::Base));

    QwtCompass *compass = new QwtCompass(this);
    compass->setLineWidth(4);
    compass->setFrameShadow(
        pos <= 2 ? QwtCompass::Sunken : QwtCompass::Raised);

    switch(pos)
    {
        case 0:
        {
            /*
              A compass with a rose and no needle. Scale and rose are
              rotating.
             */
            compass->setMode(QwtCompass::RotateScale);

            QwtSimpleCompassRose *rose = new QwtSimpleCompassRose(16, 2);
            rose->setWidth(0.15);

            compass->setRose(rose);
            break;
        }
        case 1:
        {
            /*
              A windrose, with a scale indicating the main directions only
             */
            QMap<double, QString> map;
            map.insert(0.0, "N");
            map.insert(90.0, "E");
            map.insert(180.0, "S");
            map.insert(270.0, "W");

            compass->setLabelMap(map);

            QwtSimpleCompassRose *rose = new QwtSimpleCompassRose(4, 1);
            compass->setRose(rose);

            compass->setNeedle(
                new QwtCompassWindArrow(QwtCompassWindArrow::Style2));
            compass->setValue(60.0);
            break;
        }
        case 2:
        {
            /*
              A compass with a rotating needle in darkBlue. Shows
              a ticks for each degree.
             */

            colorGroup.setColor(Palette::Base, Qt::darkBlue);
            colorGroup.setColor(Palette::Foreground, 
                QColor(Qt::darkBlue).dark(120));
            colorGroup.setColor(Palette::Text, Qt::white);

            compass->setScaleOptions(QwtDial::ScaleTicks | QwtDial::ScaleLabel);
            compass->setScaleTicks(1, 1, 3);
            compass->setScale(36, 5, 0);

            compass->setNeedle(
                new QwtCompassMagnetNeedle(QwtCompassMagnetNeedle::ThinStyle));
            compass->setValue(220.0);

            break;
        }
        case 3:
        {
            /*
              A compass without a frame, showing numbers as tick labels.
              The origin is at 220.0
             */
#if QT_VERSION < 0x040000
            colorGroup.setColor(Palette::Base, backgroundColor());
#else
            colorGroup.setColor(Palette::Base, 
                palette().color(backgroundRole()));
#endif
            colorGroup.setColor(Palette::Foreground, Qt::blue);
                
            compass->setLineWidth(0);

            compass->setScaleOptions(QwtDial::ScaleBackbone | 
                QwtDial::ScaleTicks | QwtDial::ScaleLabel);
            compass->setScaleTicks(0, 0, 3);

            QMap<double, QString> map;
            for ( double d = 0.0; d < 360.0; d += 60.0 )
            {
                QString label;
                label.sprintf("%.0f", d);
                map.insert(d, label);
            }
            compass->setLabelMap(map);
            compass->setScale(36, 5, 0);

            compass->setNeedle(new QwtDialSimpleNeedle(QwtDialSimpleNeedle::Ray,
                false, Qt::white));
            compass->setOrigin(220.0);
            compass->setValue(20.0);
            break;
        }
        case 4:
        {
            /*
             A compass showing another needle
             */
            compass->setScaleOptions(QwtDial::ScaleTicks | QwtDial::ScaleLabel);
            compass->setScaleTicks(0, 0, 3);

            compass->setNeedle(new QwtCompassMagnetNeedle(
                QwtCompassMagnetNeedle::TriangleStyle, Qt::white, Qt::red));
            compass->setValue(220.0);
            break;
        }
        case 5:
        {
            /*
             A compass with a yellow on black ray
             */
            colorGroup.setColor(Palette::Foreground, Qt::black);

            compass->setNeedle(new QwtDialSimpleNeedle(QwtDialSimpleNeedle::Ray,
                false, Qt::yellow));
            compass->setValue(315.0);
            break;
        }
    }

    QPalette newPalette = compass->palette();
    for ( c = 0; c < Palette::NColorRoles; c++ )
    {
        if ( colorGroup.color((Palette::ColorRole)c).isValid() )
        {
            for ( int cg = 0; cg < QPalette::NColorGroups; cg++ )
            {   
                newPalette.setColor(
                    (QPalette::ColorGroup)cg, 
                    (Palette::ColorRole)c, 
                    colorGroup.color((Palette::ColorRole)c));
            }
        }
    }

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

        const QColor light = 
            newPalette.color(cg, Palette::Base).light(170);
        const QColor dark = newPalette.color(cg, Palette::Base).dark(170);
        const QColor mid = compass->frameShadow() == QwtDial::Raised
            ? newPalette.color(cg, Palette::Base).dark(110)
            : newPalette.color(cg, Palette::Base).light(110);
    
        newPalette.setColor(cg, Palette::Dark, dark);
        newPalette.setColor(cg, Palette::Mid, mid);
        newPalette.setColor(cg, Palette::Light, light);
    }
    compass->setPalette(newPalette);

    return compass;
}