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statistics: print ellipsis in case of too little space

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In categorical axes all labels were printed leading to a big
tohu wa-bohu for two many bins. Therefore, if a label is
larger than the space between two ticks, replace by an ellipsis.

Adjust the size of the ellipsis (".", ".." or "...") to the
available space.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-01-11 13:29:15 +01:00
parent bdecd98ef5
commit 108f6fed2f
1 changed files with 32 additions and 2 deletions
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34
stats/statsaxis.cpp
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@ -365,9 +365,33 @@ std::pair<QString, QString> CategoryAxis::getFirstLastLabel() const
return { QString(), QString() };
}
// Get ellipses for a given label size
static QString ellipsis1 = QStringLiteral("․");
static QString ellipsis2 = QStringLiteral("‥");
static QString ellipsis3 = QStringLiteral("…");
static QString getEllipsis(const QFontMetrics &fm, double widthIn)
{
int width = static_cast<int>(floor(widthIn));
if (fm.size(Qt::TextSingleLine, ellipsis3).width() < width)
return ellipsis3;
if (fm.size(Qt::TextSingleLine, ellipsis2).width() < width)
return ellipsis2;
if (fm.size(Qt::TextSingleLine, ellipsis1).width() < width)
return ellipsis1;
return QString();
}
void CategoryAxis::updateLabels()
{
// TODO: paint ellipses if space too small
if (labelsText.empty())
return;
QFontMetrics fm(labelFont);
double size_per_label = size / static_cast<double>(labelsText.size()) - axisTickWidth;
double fontHeight = fm.height();
QString ellipsis = horizontal ? getEllipsis(fm, size_per_label) : QString();
labels.clear();
ticks.clear();
labels.reserve(labelsText.size());
@ -375,7 +399,13 @@ void CategoryAxis::updateLabels()
double pos = 0.0;
addTick(-0.5);
for (const QString &s: labelsText) {
addLabel(s, pos);
if (horizontal) {
double width = static_cast<double>(fm.size(Qt::TextSingleLine, s).width());
addLabel(width < size_per_label ? s : ellipsis, pos);
} else {
if (fontHeight < size_per_label)
addLabel(s, pos);
}
addTick(pos + 0.5);
pos += 1.0;
}