Avoiding Truncated Labels

[ChrisW67]

G'day All,

I've been experimenting with the Qwt histogram and cpuplot examples trying to produce a chart on a time axis. The labels on my x axis are rotated dates. The rightmost date was slightly truncated at its top-right extremity but I fixed that with a bit of code lifted from the cpuplot example. The left most label in my graph (see blue box below) is badly truncated. The time labels in the cpuplot example are not similarly truncated.

The plot layout code looks like:

QwtPlot plot;
    plot.setMargin(5);
    plot.setCanvasBackground(QColor(Qt::white));
    plot.setTitle("Hours by Month");
    plot.setAxisTitle(QwtPlot::yLeft, "Hours");
    plot.setAxisTitle(QwtPlot::xBottom, "Date");
    plot.setAxisScaleDraw(QwtPlot::xBottom,
                            new TimeScaleDraw(QDate::currentDate()));
    plot.setAxisLabelRotation(QwtPlot::xBottom, -50.0);
    plot.setAxisLabelAlignment(QwtPlot::xBottom, Qt::AlignLeft | Qt::AlignBottom);
 
    // From cpuplot example to stop rightmost label being truncated
    QwtScaleWidget *scaleWidget = plot.axisWidget(QwtPlot::xBottom);
    const int fmh = QFontMetrics(scaleWidget->font()).height();
    scaleWidget->setMinBorderDist(0, fmh / 2);

QwtPlot plot;
    plot.setMargin(5);
    plot.setCanvasBackground(QColor(Qt::white));
    plot.setTitle("Hours by Month");
    plot.setAxisTitle(QwtPlot::yLeft, "Hours");
    plot.setAxisTitle(QwtPlot::xBottom, "Date");
    plot.setAxisScaleDraw(QwtPlot::xBottom,
                            new TimeScaleDraw(QDate::currentDate()));
    plot.setAxisLabelRotation(QwtPlot::xBottom, -50.0);
    plot.setAxisLabelAlignment(QwtPlot::xBottom, Qt::AlignLeft | Qt::AlignBottom);

    // From cpuplot example to stop rightmost label being truncated
    QwtScaleWidget *scaleWidget = plot.axisWidget(QwtPlot::xBottom);
    const int fmh = QFontMetrics(scaleWidget->font()).height();
    scaleWidget->setMinBorderDist(0, fmh / 2);

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a bunch of code building QwtScaleDiv tick data, then

QwtScaleDiv sd(-(double)(numValues+1), 1.0, vl);
    plot.setAxisScaleDiv(QwtPlot::xBottom, sd);

QwtScaleDiv sd(-(double)(numValues+1), 1.0, vl);
    plot.setAxisScaleDiv(QwtPlot::xBottom, sd);

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followed by an essentially unmodified (colours aside) histogram example.

I thought it might be a z-order issue with the y-axis scale overwriting, but I couldn't find a way to change this. What do I need to tweak to sort this out?

Regards,
Chris

Qwt 5.2.0, Qt 4.5.1, Linux