QImage绘图问题 [复制链接]

这是c++ GUI QT4编程的例子，例子里是用Qpixmap画图的，我改用QImage后，放大和缩小的那两个按钮显示不出来了，请教各位，这是什么原因？谢谢了！在线等。。。。。。
这是源码
plotter_qimage.cpp
#include "plotter_qimage.h"
#include <QtGui>
#include <cmath>

plotter_qimage::plotter_qimage(QWidget *parent)
: QWidget(parent)
{
    setBackgroundRole(QPalette::Dark);
    setAutoFillBackground(true);
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    setFocusPolicy(Qt::StrongFocus);
    rubberBandIsShown = false;

    zoomInButton = new QToolButton(this);
    zoomInButton->setIcon(QIcon(":/images/zoomin.png"));
    zoomInButton->adjustSize();
    connect(zoomInButton, SIGNAL(clicked()), this, SLOT(zoomIn()));

    zoomOutButton = new QToolButton(this);
    zoomOutButton->setIcon(QIcon(":/images/zoomout.png"));
    zoomOutButton->adjustSize();
    connect(zoomOutButton, SIGNAL(clicked()), this, SLOT(zoomOut()));

    setPlotSettings(PlotSettings());
}

void plotter_qimage::setPlotSettings(const PlotSettings &settings)
{
    zoomStack.clear();
    zoomStack.append(settings);
    curZoom = 0;
    zoomInButton->hide();
    zoomOutButton->hide();
    refreshImage();
}

void plotter_qimage::zoomOut()
{
    if (curZoom > 0) {
        --curZoom;
        zoomOutButton->setEnabled(curZoom > 0);
        zoomInButton->setEnabled(true);
        zoomInButton->show();
        refreshImage();
    }
}

void plotter_qimage::zoomIn()
{
    if (curZoom < zoomStack.count() - 1) {
        ++curZoom;
        zoomInButton->setEnabled(curZoom < zoomStack.count() - 1);
        zoomOutButton->setEnabled(true);
        zoomOutButton->show();
        refreshImage();
    }
}

void plotter_qimage::setCurveData(int id, const QVector<QPointF> &data)
{
    curveMap[id] = data;
    refreshImage();
}

void plotter_qimage::clearCurve(int id)
{
    curveMap.remove(id);
    refreshImage();
}

QSize plotter_qimage::minimumSizeHint() const
{
    return QSize(6 * Margin, 4 * Margin);
}

QSize plotter_qimage::sizeHint() const
{
    return QSize(12 * Margin, 8 * Margin);
}

void plotter_qimage::paintEvent(QPaintEvent * /* event */)
{
    QStylePainter painter(this);
    painter.drawImage(0, 0, image);//start drawing at point(0,0) of the widget

    if (rubberBandIsShown) {
        painter.setPen(palette().light().color());
        painter.drawRect(rubberBandRect.normalized()
            .adjusted(0, 0, -1, -1));
    }

    if (hasFocus()) {
        QStyleOptionFocusRect option;
        option.initFrom(this);
        option.backgroundColor = palette().dark().color();
        painter.drawPrimitive(QStyle::PE_FrameFocusRect, option);
    }
}

void plotter_qimage::resizeEvent(QResizeEvent * /* event */)
{
    int x = width() - (zoomInButton->width()
        + zoomOutButton->width() + 10);
    zoomInButton->move(x, 5);
    zoomOutButton->move(x + zoomInButton->width() + 5, 5);
    refreshImage();
}

void plotter_qimage::mousePressEvent(QMouseEvent *event)
{
    QRect rect(Margin, Margin,
        width() - 2 * Margin, height() - 2 * Margin);

    if (event->button() == Qt::LeftButton) {
        if (rect.contains(event->pos())) {
            rubberBandIsShown = true;
            rubberBandRect.setTopLeft(event->pos());
            rubberBandRect.setBottomRight(event->pos());
            updateRubberBandRegion();
            setCursor(Qt::CrossCursor);
        }
    }
}

void plotter_qimage::mouseMoveEvent(QMouseEvent *event)
{
    if (rubberBandIsShown) {
        updateRubberBandRegion();
        rubberBandRect.setBottomRight(event->pos());
        updateRubberBandRegion();
    }
}

void plotter_qimage::mouseReleaseEvent(QMouseEvent *event)
{
    if ((event->button() == Qt::LeftButton) && rubberBandIsShown) {
        rubberBandIsShown = false;
        updateRubberBandRegion();
        unsetCursor();

        QRect rect = rubberBandRect.normalized();
        if (rect.width() < 4 || rect.height() < 4)
            return;
        rect.translate(-Margin, -Margin);

        PlotSettings prevSettings = zoomStack[curZoom];
        PlotSettings settings;
        double dx = prevSettings.spanX() / (width() - 2 * Margin);
        double dy = prevSettings.spanY() / (height() - 2 * Margin);
        settings.minX = prevSettings.minX + dx * rect.left();
        settings.maxX = prevSettings.minX + dx * rect.right();
        settings.minY = prevSettings.maxY - dy * rect.bottom();
        settings.maxY = prevSettings.maxY - dy * rect.top();
        settings.adjust();

        zoomStack.resize(curZoom + 1);
        zoomStack.append(settings);
        zoomIn();
    }
}

void plotter_qimage::keyPressEvent(QKeyEvent *event)
{
    switch (event->key()) {
    case Qt::Key_Plus:
        zoomIn();
        break;
    case Qt::Key_Minus:
        zoomOut();
        break;
    case Qt::Key_Left:
        zoomStack[curZoom].scroll(-1, 0);
        refreshImage();
        break;
    case Qt::Key_Right:
        zoomStack[curZoom].scroll(+1, 0);
        refreshImage();
        break;
    case Qt::Key_Down:
        zoomStack[curZoom].scroll(0, -1);
        refreshImage();
        break;
    case Qt::Key_Up:
        zoomStack[curZoom].scroll(0, +1);
        refreshImage();
        break;
    default:
        QWidget::keyPressEvent(event);
    }
}

void plotter_qimage::wheelEvent(QWheelEvent *event)
{
    int numDegrees = event->delta() / 8;
    int numTicks = numDegrees / 15;

    if (event->orientation() == Qt::Horizontal) {
        zoomStack[curZoom].scroll(numTicks, 0);
    } else {
        zoomStack[curZoom].scroll(0, numTicks);
    }
    refreshImage();
}

void plotter_qimage::updateRubberBandRegion()
{
    QRect rect = rubberBandRect.normalized();
    update(rect.left(), rect.top(), rect.width(), 1);
    update(rect.left(), rect.top(), 1, rect.height());
    update(rect.left(), rect.bottom(), rect.width(), 1);
    update(rect.right(), rect.top(), 1, rect.height());
}

void plotter_qimage::refreshImage()
{
    image = QImage(size(),QImage::Format_RGB16);
    //int depth = image.depth();
    image.fill(0xFFFF);

    QPainter painter(&image);
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.initFrom(this);
    drawGrid(&painter);
    drawCurves(&painter);
    update();
}

void plotter_qimage::drawGrid(QPainter *painter)
{
    QRect rect(Margin, Margin,
        width() - 2 * Margin, height() - 2 * Margin);
    if (!rect.isValid())
        return;

    PlotSettings settings = zoomStack[curZoom];
    QPen quiteDark = palette().dark().color().light();
    QPen light = palette().light().color();

    for (int i = 0; i <= settings.numXTicks; ++i) {
        int x = rect.left() + (i * (rect.width() - 1)
            / settings.numXTicks);
        double label = settings.minX + (i * settings.spanX()
            / settings.numXTicks);
        painter->setPen(quiteDark);
        painter->drawLine(x, rect.top(), x, rect.bottom());
        painter->setPen(light);
        painter->drawLine(x, rect.bottom(), x, rect.bottom() + 5);
        painter->drawText(x - 50, rect.bottom() + 5, 100, 20,
            Qt::AlignHCenter | Qt::AlignTop,
            QString::number(label));
    }
    for (int j = 0; j <= settings.numYTicks; ++j) {
        int y = rect.bottom() - (j * (rect.height() - 1)
            / settings.numYTicks);
        double label = settings.minY + (j * settings.spanY()
            / settings.numYTicks);
        painter->setPen(quiteDark);
        painter->drawLine(rect.left(), y, rect.right(), y);
        painter->setPen(light);
        painter->drawLine(rect.left() - 5, y, rect.left(), y);
        painter->drawText(rect.left() - Margin, y - 10, Margin - 5, 20,
            Qt::AlignRight | Qt::AlignVCenter,
            QString::number(label));
    }
    painter->drawRect(rect.adjusted(0, 0, -1, -1));
}

void plotter_qimage::drawCurves(QPainter *painter)
{
    static const QColor colorForIds[6] = {
        Qt::red, Qt::green, Qt::blue, Qt::cyan, Qt::magenta, Qt::yellow
    };
    PlotSettings settings = zoomStack[curZoom];
    QRect rect(Margin, Margin,
        width() - 2 * Margin, height() - 2 * Margin);
    if (!rect.isValid())
        return;

    painter->setClipRect(rect.adjusted(+1, +1, -1, -1));

    QMapIterator<int, QVector<QPointF> > i(curveMap);
    while (i.hasNext()) {
        i.next();

        int id = i.key();
        QVector<QPointF> data = i.value();
        QPolygonF polyline(data.count());

        for (int j = 0; j < data.count(); ++j) {
            double dx = data[j].x() - settings.minX;
            double dy = data[j].y() - settings.minY;
            double x = rect.left() + (dx * (rect.width() - 1)
                / settings.spanX());
            double y = rect.bottom() - (dy * (rect.height() - 1)
                / settings.spanY());
            polyline[j] = QPointF(x, y);
        }
        painter->setPen(colorForIds[uint(id) % 6]);
        painter->drawPolyline(polyline);
    }
}

PlotSettings::PlotSettings()
{
    minX = 0.0;
    maxX = 10.0;
    numXTicks = 5;

    minY = 0.0;
    maxY = 10.0;
    numYTicks = 5;
}

void PlotSettings::scroll(int dx, int dy)
{
    double stepX = spanX() / numXTicks;
    minX += dx * stepX;
    maxX += dx * stepX;

    double stepY = spanY() / numYTicks;
    minY += dy * stepY;
    maxY += dy * stepY;
}

void PlotSettings::adjust()
{
    adjustAxis(minX, maxX, numXTicks);
    adjustAxis(minY, maxY, numYTicks);
}

void PlotSettings::adjustAxis(double &min, double &max, int &numTicks)
{
    const int MinTicks = 4;
    double grossStep = (max - min) / MinTicks;
    double step = std::pow(10.0, std::floor(std::log10(grossStep)));

    if (5 * step < grossStep) {
        step *= 5;
    } else if (2 * step < grossStep) {
        step *= 2;
    }

    numTicks = int(std::ceil(max / step) - std::floor(min / step));
    if (numTicks < MinTicks)
        numTicks = MinTicks;
    min = std::floor(min / step) * step;
    max = std::ceil(max / step) * step;
}

plotter_qimage.h
#ifndef PLOTTER_QIMAGE_H
#define PLOTTER_QIMAGE_H

#include <QtGui/QWidget>
//#include "ui_plotter.h"

#include <QMap>
#include <QPixmap>
#include <QVector>
#include <QWidget>

class QToolButton;
class PlotSettings;

class plotter_qimage : public QWidget
{
    Q_OBJECT

public:
    plotter_qimage(QWidget *parent = 0);

    void setPlotSettings(const PlotSettings &settings);
    void setCurveData(int id, const QVector<QPointF> &data);
    void clearCurve(int id);
    QSize minimumSizeHint() const;
    QSize sizeHint() const;

    public slots:
        void zoomIn();
        void zoomOut();

protected:
    void paintEvent(QPaintEvent *event);
    void resizeEvent(QResizeEvent *event);
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);
    void keyPressEvent(QKeyEvent *event);
    void wheelEvent(QWheelEvent *event);

private:
    void updateRubberBandRegion();
    void refreshImage();
    void drawGrid(QPainter *painter);
    void drawCurves(QPainter *painter);

    enum { Margin = 50 };

    QToolButton *zoomInButton;
    QToolButton *zoomOutButton;
    QMap<int, QVector<QPointF> > curveMap;
    QVector<PlotSettings> zoomStack;
    int curZoom;
    bool rubberBandIsShown;
    QRect rubberBandRect;
    QImage image;
};

class PlotSettings
{
public:
    PlotSettings();

    void scroll(int dx, int dy);
    void adjust();
    double spanX() const { return maxX - minX; }
    double spanY() const { return maxY - minY; }

    double minX;
    double maxX;
    int numXTicks;
    double minY;
    double maxY;
    int numYTicks;

private:
    static void adjustAxis(double &min, double &max, int &numTicks);
};
#endif //

main.cpp
#include "plotter_qimage.h"
#include <QtGui/QApplication>

#include <QtGui/QApplication>

#include <QtGui>

void readFlightCurves(plotter_qimage *plotter_qimage, const QString &fileName)
{
    QVector<QPointF> data[6];
    double factX = 0.0013;
    double factY[6] = { 0.0008, 0.1, 0.2, 0.2, 0.1, 0.8 };
    double offsY[6] = { +500, -55, +309, +308, 0, 0 };
    int pos[6] = { 3, 6, 7, 8, 9, 10 };
    QFile file(fileName);
    double offsX = 0.0;

    if (file.open(QIODevice::ReadOnly)) {
        QTextStream in(&file);
        while (!in.atEnd()) {
            QString line = in.readLine();
            QStringList coords = line.split(' ',
                QString::SkipEmptyParts);
            if (coords.count() >= 6) {
                double x = factX * coords[0].toDouble();
                if (data[0].isEmpty())
                    offsX = x;
                for (int i = 0; i < 6; ++i) {
                    double y = coords[pos].toDouble();
                    data.append(QPointF(x - offsX,
                        factY * (y - offsY)));
                }
            }
        }
    }

    plotter_qimage->setCurveData(0, data[0]);
    plotter_qimage->setCurveData(1, data[1]);
    plotter_qimage->setCurveData(2, data[2]);
    plotter_qimage->setCurveData(3, data[3]);
    plotter_qimage->setCurveData(4, data[4]);
    plotter_qimage->setCurveData(5, data[5]);
}

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    plotter_qimage plotter_qimage;
    plotter_qimage.setWindowTitle(QObject::tr("Jambi plotter_qimage"));
#if 0
    readFlightCurves(&plotter_qimage, ":/in1.txt");
#else
    int numPoints = 100;
    QVector<QPointF> points0;
    QVector<QPointF> points1;
    for (int x = 0; x < numPoints; ++x) {
        points0.append(QPointF(x, uint(qrand()) % 100));
        points1.append(QPointF(x, uint(qrand()) % 100));
    }
    plotter_qimage.setCurveData(0, points0);
    plotter_qimage.setCurveData(1, points1);

    PlotSettings settings;
    settings.minX = 0.0;
    settings.maxX = 100.0;
    settings.minY = 0.0;
    settings.maxY = 100.0;
    plotter_qimage.setPlotSettings(settings);
#endif
    plotter_qimage.show();
    return app.exec();
}

    QStylePainter painter(this);
    painter.drawImage(0, 0, image);
就是在QImage上，怎么显示按钮呀，如果把QImage改成Qpixmap就能显示按钮，但是我现在需要显示在QImage上，哪位知道问题在哪里吗？恳请大家帮帮忙呀？

把按钮上的图片改为文字可以显示，是不是因为图片不是rbg565，而我创建的QImage用的是QImage::Format_RGB16，rgb565啊？