'QwtPlotLayout'中没有名为'setMargin'的成员 - 将Qt4.7转换为Qt5.8

我需要 convert Qt legacy code from 4.7 to 5.8 ，我在Qt Creator 4.2.1 Clang 7.0（Apple）64bit中有编译错误 . 我正在使用最新的Qwt 6.1.3

Looking in .cpp file

#include "frmMainChart_UI.h"
#include <QHeaderView>
#include <qwt_plot_layout.h>
#include <qwt_legend.h>
#include "mpiDateScale.h"
#include "mpiPercentScale.h"

void frmMainChart_UI::setupUI(QWidget *parent_)
{
    frmMainTableViewTree_UI::setupUI(QMap<int, QString>(), false, parent_);
    delete frmMainTableViewTree_UI::tableCopy;
    delete frmMainTableViewTree_UI::table;

    chart = new mpiChart(widget);
    chart->setAxisScaleDraw(QwtPlot::xBottom, new mpiDateScale());
    chart->setAxisScaleDraw(QwtPlot::yLeft, new mpiPercentScale());
    chart->plotLayout()->setCanvasMargin(20);
    chart->plotLayout()->setMargin(20);  // BROKE convert Qt4 to Qt5
    chartZoomer = new mpiPlotZoomer(chart->canvas()); // BROKE convert Qt4 to Qt5
    chartLegend = new QwtLegend(chart);
    chart->insertLegend(chartLegend, QwtPlot::RightLegend);

    QLinearGradient grad(0, 0, 1, 1);
    grad.setCoordinateMode(QGradient::StretchToDeviceMode);
    grad.setColorAt(0, Qt::white);
    grad.setColorAt(1, QColor(220, 220, 220));

2 Errors in .cpp

../src/ui/frmMainChart_UI.cpp:18:26:1165378_ chart-> plotLayout（） - > setMargin（20）; // BROKE将Qt4转换为Qt5

../src/ui/frmMainChart_UI.cpp:19：23： error: no matching constructor for initialization of 'mpiPlotZoomer' chartZoomer = new mpiPlotZoomer（chart-> canvas（））; // BROKE将Qt4转换为Qt5

^

5 warnings and 2 errors generated make：*** [frmMainChart_UI.o]错误1 06:58:25：进程"/usr/bin/make"退出代码2.构建/部署项目mypersonalindex时出错（工具包：Desktop Qt 5.8.0 clang 64bit）执行步骤"Make" 06 ：58：25：经过的时间：00：01 .

Qwt 6.1.3 Docs 有成员函数http://qwt.sourceforge.net/class_qwt_plot_layout.html

void    setCanvasMargin (int margin, int axis=-1)

但是没有使用会员功能

setMargin

我的C技能非常有限，您是否看到任何可以将其从Qt4转换为Qt5的小调整 . ......那么替代品是什么？

查看mpiChart.h可能与canvas（）错误有关

#ifndef MPICHART_H
#define MPICHART_H

#include "qwt_plot.h"

class mpiChart : public QwtPlot
{
    Q_OBJECT

public:
    mpiChart(QWidget *parent_ = 0):
        QwtPlot(parent_)
    {}

public slots:
    void exportChart();
};

#endif // MPICHART_H

并且在mpiPlotZoomer.h中查找与canvas（）错误有关

#ifndef MPIPLOTZOOMER_H
#define MPIPLOTZOOMER_H

#include <qwt_plot_zoomer.h>
#include <qwt_plot_canvas.h>  // JDL convert Qt4 to Qt5
#include <qwt_compat.h>  // JDL convert Qt4 to Qt5

class mpiPlotZoomer: public QwtPlotZoomer
{
public:
    mpiPlotZoomer(QwtPlotCanvas *canvas_):
        QwtPlotZoomer(canvas_, false)
    {
        setTrackerMode(AlwaysOn);
    }

    virtual QwtText trackerText(const QwtDoublePoint &pos_) const;
};

#endif // MPIPLOTZOOMER_H