如何防止序列值缩放到Qt图表轴的100%范围？

QValueAxis *axis = new QValueAxis;
axis->setMin(0);
axis->setMax(100);

QValueAxis *axis = new QValueAxis;
axis->setRange(0, 100);
axis->setAutoAdjustRange(true);

QLineSeries *series = new QLineSeries;
series->setPointLabelsVisible(true);
series->setPointLabelsFormat("@yPoint");
series->setPointLabelsClipping(true);
series->setPointLabelsPrecision(0);
series->setPointLabelsColor(Qt::black);
series->setPointLabelsFont(QFont("Arial", 8));
series->setPointLabelsFormat("@yPoint");