Qt 画多幅折线图失败,求大神解惑

Question

我使用的是QtCharts画折线图，全都是按照demo写的，之前画一副的时候没有问题，但是现在提示：
QPainterPath::lineTo: Adding point where x or y is NaN or Inf, ignoring call
QPainterPath::lineTo: Adding point where x or y is NaN or Inf, ignoring call
我已经单步调试过了，坐标输入没有问题，这个是处在append的时候，部分代码如下：
//创建Chart
for(int i = 0;i < 5;i++)
{
chart_rag[i] = new QPolarChart();
}

//创建曲线
for(int i = 0;i < 8; i++)
{
    //============================================================================
    series_freq_1[i] = new QLineSeries();
    series_freq_2[i] = new QLineSeries();
    series_freq[i] = new QAreaSeries();

    series_freq[i]->setUpperSeries(series_freq_1[i]);
    series_freq[i]->setLowerSeries(series_freq_2[i]);

    chart_rag[0]->addSeries(series_freq_1[i]);
    chart_rag[0]->addSeries(series_freq_2[i]);
    chart_rag[0]->addSeries(series_freq[i]);

    //============================================================================
    series_send_1[i] = new QLineSeries();
    series_send_2[i] = new QLineSeries();
    series_send[i] = new QAreaSeries();

    series_send[i]->setUpperSeries(series_send_1[i]);
    series_send[i]->setLowerSeries(series_send_2[i]);

    chart_rag[1]->addSeries(series_send_1[i]);
    chart_rag[1]->addSeries(series_send_2[i]);
    chart_rag[1]->addSeries(series_send[i]);

    //============================================================================
    series_beam_1[i] = new QLineSeries();
    series_beam_2[i] = new QLineSeries();
    series_beam[i] = new QAreaSeries();

    series_beam[i]->setUpperSeries(series_beam_1[i]);
    series_beam[i]->setLowerSeries(series_beam_2[i]);

    chart_rag[2]->addSeries(series_beam_1[i]);
    chart_rag[2]->addSeries(series_beam_2[i]);
    chart_rag[2]->addSeries(series_beam[i]);

    //============================================================================
    series_stc_1[i] = new QLineSeries();
    series_stc_2[i] = new QLineSeries();
    series_stc[i] = new QAreaSeries();

    series_stc[i]->setUpperSeries(series_stc_1[i]);
    series_stc[i]->setLowerSeries(series_stc_2[i]);

    chart_rag[3]->addSeries(series_stc_1[i]);
    chart_rag[3]->addSeries(series_stc_2[i]);
    chart_rag[3]->addSeries(series_stc[i]);

    //============================================================================
    series_workmode_1[i] = new QLineSeries();
    series_workmode_2[i] = new QLineSeries();
    series_workmode[i] = new QAreaSeries();

    series_workmode[i]->setUpperSeries(series_workmode_1[i]);
    series_workmode[i]->setLowerSeries(series_workmode_2[i]);

    chart_rag[4]->addSeries(series_workmode_1[i]);
    chart_rag[4]->addSeries(series_workmode_2[i]);
    chart_rag[4]->addSeries(series_workmode[i]);

}

for(int i = 0;i < 5;i ++)
{
    angularAxis[i] = new QValueAxis();
    angularAxis[i]->setTickCount(9); // First and last ticks are co-located on 0/360 angle.
    angularAxis[i]->setLabelFormat("%.1f");
    angularAxis[i]->setShadesVisible(false);
    angularAxis[i]->setShadesBrush(QBrush(QColor(249, 249, 255)));
    chart_rag[i]->addAxis(angularAxis[i], QPolarChart::PolarOrientationAngular);

    radialAxis[i] = new QValueAxis();
    radialAxis[i]->setTickCount(9);
    radialAxis[i]->setLabelFormat("%d");
    chart_rag[i]->addAxis(radialAxis[i], QPolarChart::PolarOrientationRadial);

    angularAxis[i]->setRange(0,360);
    radialAxis[i]->setRange(0,max_radial);
}


series_freq_1[0]->append(10,200);
//曲线绑定坐标轴
for(int i = 0;i < 8;i++)
{
    series_freq_1[i]->attachAxis(angularAxis[0]);
    series_freq_1[i]->attachAxis(radialAxis[0]);

    series_freq_2[i]->attachAxis(angularAxis[0]);
    series_freq_2[i]->attachAxis(radialAxis[0]);

    series_freq[i]->attachAxis(angularAxis[0]);
    series_freq[i]->attachAxis(radialAxis[0]);

    series_send_1[i]->attachAxis(angularAxis[1]);
    series_send_1[i]->attachAxis(radialAxis[1]);

    series_send_2[i]->attachAxis(angularAxis[1]);
    series_send_2[i]->attachAxis(radialAxis[1]);

    series_send[i]->attachAxis(angularAxis[1]);
    series_send[i]->attachAxis(radialAxis[1]);

    series_beam_1[i]->attachAxis(angularAxis[2]);
    series_beam_1[i]->attachAxis(radialAxis[2]);

    series_beam_2[i]->attachAxis(angularAxis[2]);
    series_beam_2[i]->attachAxis(radialAxis[2]);

    series_beam[i]->attachAxis(angularAxis[2]);
    series_beam[i]->attachAxis(radialAxis[2]);

    series_stc_1[i]->attachAxis(angularAxis[3]);
    series_stc_1[i]->attachAxis(radialAxis[3]);

    series_stc_2[i]->attachAxis(angularAxis[3]);
    series_stc_2[i]->attachAxis(radialAxis[3]);

    series_stc[i]->attachAxis(angularAxis[3]);
    series_stc[i]->attachAxis(radialAxis[3]);

    series_workmode_1[i]->attachAxis(angularAxis[4]);
    series_workmode_1[i]->attachAxis(radialAxis[4]);

    series_workmode_2[i]->attachAxis(angularAxis[4]);
    series_workmode_2[i]->attachAxis(radialAxis[4]);

    series_workmode[i]->attachAxis(angularAxis[4]);
    series_workmode[i]->attachAxis(radialAxis[4]);
}
series_freq_1[0]->append(10,20);
ui->widgetFreqSyn->setChart(chart_rag[0]);
ui->widgetSend->setChart(chart_rag[1]);
ui->widgetBeamControl->setChart(chart_rag[2]);
ui->widgetSTC->setChart(chart_rag[4]);
ui->widgetWorkMode->setChart(chart_rag[3]);


ui->widgetFreqSyn->setRenderHint(QPainter::Antialiasing);
ui->widgetSend->setRenderHint(QPainter::Antialiasing);
ui->widgetBeamControl->setRenderHint(QPainter::Antialiasing);
ui->widgetSTC->setRenderHint(QPainter::Antialiasing);
ui->widgetWorkMode->setRenderHint(QPainter::Antialiasing);

Answer 1

下断点调试，出错的时候根据堆栈，找到调用的那行代码，仔细检查，有值为NaN（也就是浮点数溢出，除以0，负数开方、求log、溢出等情况都会导致NaN）