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// SPDX-License-Identifier: GPL-2.0
#include "pieseries.h"
#include "informationbox.h"
#include "statscolors.h"
#include "statshelper.h"
#include "statstranslations.h"
#include "statsview.h"
#include "zvalues.h"
#include <numeric>
#include <math.h>
#include <QLocale>
static const double pieSize = 0.9; // 1.0 = occupy full width of chart
static const double pieBorderWidth = 1.0;
static const double innerLabelRadius = 0.75; // 1.0 = at outer border of pie
static const double outerLabelRadius = 1.01; // 1.0 = at outer border of pie
PieSeries::Item::Item(StatsView &view, const QString &name, int from, std::vector<dive *> divesIn, int totalCount,
int bin_nr, int numBins) :
name(name),
dives(std::move(divesIn))
{
QFont f; // make configurable
QLocale loc;
int count = (int)dives.size();
angleFrom = static_cast<double>(from) / totalCount;
angleTo = static_cast<double>(from + count) / totalCount;
double meanAngle = M_PI / 2.0 - (from + count / 2.0) / totalCount * M_PI * 2.0; // Note: "-" because we go CW.
innerLabelPos = QPointF(cos(meanAngle) * innerLabelRadius, -sin(meanAngle) * innerLabelRadius);
outerLabelPos = QPointF(cos(meanAngle) * outerLabelRadius, -sin(meanAngle) * outerLabelRadius);
double percentage = count * 100.0 / totalCount;
QString innerLabelText = QStringLiteral("%1\%").arg(loc.toString(percentage, 'f', 1));
innerLabel = view.createChartItem<ChartTextItem>(ChartZValue::SeriesLabels, f, innerLabelText);
outerLabel = view.createChartItem<ChartTextItem>(ChartZValue::SeriesLabels, f, name);
outerLabel->setColor(darkLabelColor);
}
void PieSeries::Item::updatePositions(const QPointF ¢er, double radius)
{
// Note: the positions in this functions are rounded to integer values,
// because half-integer values gives horrible aliasing artifacts.
if (innerLabel) {
QRectF labelRect = innerLabel->getRect();
QPointF pos(center.x() + innerLabelPos.x() * radius - labelRect.width() / 2.0,
center.y() + innerLabelPos.y() * radius - labelRect.height() / 2.0);
innerLabel->setPos(roundPos(pos));
}
if (outerLabel) {
QRectF labelRect = outerLabel->getRect();
QPointF pos(center.x() + outerLabelPos.x() * radius, center.y() + outerLabelPos.y() * radius);
if (outerLabelPos.x() < 0.0) {
if (outerLabelPos.y() < 0.0)
pos -= QPointF(labelRect.width(), labelRect.height());
else
pos.rx() -= labelRect.width();
} else if (outerLabelPos.y() < 0.0) {
pos.ry() -= labelRect.height();
}
outerLabel->setPos(roundPos(pos));
}
}
void PieSeries::Item::highlight(ChartPieItem &item, int bin_nr, bool highlight, int numBins)
{
QColor fill = highlight ? highlightedColor : binColor(bin_nr, numBins);
QColor border = highlight ? highlightedBorderColor : ::borderColor;
if (innerLabel)
innerLabel->setColor(highlight ? darkLabelColor : labelColor(bin_nr, numBins), fill);
item.drawSegment(angleFrom, angleTo, fill, border);
}
PieSeries::PieSeries(StatsView &view, StatsAxis *xAxis, StatsAxis *yAxis, const QString &categoryName,
std::vector<std::pair<QString, std::vector<dive *>>> data, bool keepOrder) :
StatsSeries(view, xAxis, yAxis),
item(view.createChartItem<ChartPieItem>(ChartZValue::Series, pieBorderWidth)),
categoryName(categoryName),
highlighted(-1)
{
// Pie charts with many slices are unreadable. Therefore, subsume slices under
// a certain percentage as "other". But draw a minimum number of slices
// until we reach 50% so that we never get a pie only of "other".
// This is heuristics, which might have to be optimized.
const int smallest_slice_percentage = 5; // Smaller than 5% = others. That makes at most 20 slices.
const int min_slices = 5; // Try to draw at least 5 slices until we reach 50%
// Easier to read than std::accumulate
totalCount = 0;
for (const auto &[name, dives]: data)
totalCount += (int)dives.size();
// First of all, sort from largest to smalles slice. Instead
// of sorting the initial array, sort a list of indices, so that
// the original order can be easily reconstructed later.
std::vector<int> sorted(data.size());
std::iota(sorted.begin(), sorted.end(), 0); // Fill with 0..size-1.
// Two notes:
// - by negating the counts in the sort below, count is sorted descending.
// - do a lexicographic sort by (count, idx) so that for equal counts the order is preserved.
std::sort(sorted.begin(), sorted.end(),
[&data](int idx1, int idx2)
{ return std::make_tuple(-data[idx1].second.size(), idx1) <
std::make_tuple(-data[idx2].second.size(), idx2); });
auto it = std::find_if(sorted.begin(), sorted.end(),
[count=totalCount, &data](int idx)
{ return (int)data[idx].second.size() * 100 / count < smallest_slice_percentage; });
if (it - sorted.begin() < min_slices) {
// Take minimum amount of slices below 50%...
int sum = 0;
for (auto it2 = sorted.begin(); it2 != it; ++it2)
sum += (int)data[*it2].second.size();
while(it != sorted.end() && sum * 2 < totalCount && it - sorted.begin() < min_slices) {
sum += (int)data[*it].second.size();
++it;
}
}
// Don't do a single "other" group
if (sorted.end() - it == 1)
++it;
// Sort the main groups and the other groups back, if requested
if (keepOrder) {
std::sort(sorted.begin(), it);
std::sort(it, sorted.end());
}
int numBins = it - sorted.begin();
if (it != sorted.end())
++numBins;
items.reserve(numBins);
int act = 0;
for (auto it2 = sorted.begin(); it2 != it; ++it2) {
int count = (int)data[*it2].second.size();
items.emplace_back(view, data[*it2].first, act, std::move(data[*it2].second),
totalCount, (int)items.size(), numBins);
act += count;
}
// Register the items of the "other" group.
if (it != sorted.end()) {
std::vector<dive *> otherDives;
otherDives.reserve(totalCount - act);
other.reserve(sorted.end() - it);
for (auto it2 = it; it2 != sorted.end(); ++it2) {
other.push_back({ data[*it2].first, (int)data[*it2].second.size() });
for (dive *d: data[*it2].second)
otherDives.push_back(d);
}
QString name = StatsTranslations::tr("other (%1 items)").arg(other.size());
items.emplace_back(view, name, act, std::move(otherDives), totalCount, (int)items.size(), numBins);
}
}
PieSeries::~PieSeries()
{
}
void PieSeries::updatePositions()
{
QRectF plotRect = view.plotArea();
center = plotRect.center();
radius = ceil(std::min(plotRect.width(), plotRect.height()) * pieSize / 2.0);
QRectF rect(round(center.x() - radius), round(center.y() - radius), ceil(2.0 * radius), ceil(2.0 * radius));
item->resize(rect.size());
item->setPos(rect.topLeft());
int i = 0;
for (Item &segment: items) {
segment.updatePositions(center, radius);
segment.highlight(*item, i, i == highlighted, (int)items.size()); // Draw segment
++i;
}
}
std::vector<QString> PieSeries::binNames()
{
std::vector<QString> res;
res.reserve(items.size());
for (Item &item: items)
res.push_back(item.name);
return res;
}
int PieSeries::getItemUnderMouse(const QPointF &f) const
{
QPointF delta = f - center;
double len = sqrt(QPointF::dotProduct(delta, delta));
if (len > radius)
return -1;
delta /= len;
double angle = 0.25 - atan2(-delta.y(), delta.x()) / 2.0 / M_PI;
while (angle < 0.0)
angle += 1.0;
auto it = std::lower_bound(items.begin(), items.end(), angle,
[](const Item &item, double angle) { return item.angleTo < angle; });
if (it == items.end())
return -1; // Floating point rounding issues?
return it - items.begin();
}
static QString makePercentageLine(int count, int total)
{
double percentage = count * 100.0 / total;
QString countString = QString("%L1").arg(count);
QString percentageString = QString("%L1%").arg(percentage, 0, 'f', 1);
QString totalString = QString("%L1").arg(total);
return StatsTranslations::tr("%1 (%2 of %3) dives").arg(countString, percentageString, totalString);
}
std::vector<QString> PieSeries::makeInfo(int idx) const
{
std::vector<QString> res;
if (idx + 1 == (int)items.size() && !other.empty()) {
// This is the "other" bin. Format all these items and an overview item.
res.reserve(other.size() + 1);
res.push_back(QString("%1: %2").arg(StatsTranslations::tr("other"),
makePercentageLine((int)items[idx].dives.size(), totalCount)));
for (const OtherItem &item: other)
res.push_back(QString("%1: %2").arg(item.name,
makePercentageLine((int)item.count, totalCount)));
} else {
// A "normal" item.
res.reserve(2);
res.push_back(QStringLiteral("%1: %2").arg(categoryName, items[idx].name));
res.push_back(makePercentageLine((int)items[idx].dives.size(), totalCount));
}
return res;
}
bool PieSeries::hover(QPointF pos)
{
int index = getItemUnderMouse(pos);
if (index == highlighted) {
if (information)
information->setPos(pos);
return index >= 0;
}
unhighlight();
highlighted = index;
// Highlight new item (if any)
if (highlighted >= 0 && highlighted < (int)items.size()) {
items[highlighted].highlight(*item, highlighted, true, (int)items.size());
if (!information)
information = view.createChartItem<InformationBox>();
information->setText(makeInfo(highlighted), pos);
information->setVisible(true);
} else {
information->setVisible(false);
}
return highlighted >= 0;
}
void PieSeries::unhighlight()
{
if (highlighted >= 0 && highlighted < (int)items.size())
items[highlighted].highlight(*item, highlighted, false, (int)items.size());
highlighted = -1;
}
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