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// SPDX-License-Identifier: GPL-2.0
#include "scatterseries.h"
#include "informationbox.h"
#include "statscolors.h"
#include "statshelper.h"
#include "statstranslations.h"
#include "statsvariables.h"
#include "zvalues.h"
#include "core/dive.h"
#include "core/divelist.h"
#include "core/qthelper.h"
#include <QGraphicsPixmapItem>
#include <QPainter>
static const int scatterItemDiameter = 10;
static const int scatterItemBorder = 1;
ScatterSeries::ScatterSeries(QGraphicsScene *scene, StatsAxis *xAxis, StatsAxis *yAxis,
const StatsVariable &varX, const StatsVariable &varY) :
StatsSeries(scene, xAxis, yAxis),
varX(varX), varY(varY)
{
}
ScatterSeries::~ScatterSeries()
{
}
static QPixmap createScatterPixmap(const QColor &color, const QColor &borderColor)
{
QPixmap res(scatterItemDiameter, scatterItemDiameter);
res.fill(Qt::transparent);
QPainter painter(&res);
painter.setPen(Qt::NoPen);
painter.setRenderHint(QPainter::Antialiasing);
painter.setBrush(borderColor);
painter.drawEllipse(0, 0, scatterItemDiameter, scatterItemDiameter);
painter.setBrush(color);
painter.drawEllipse(scatterItemBorder, scatterItemBorder,
scatterItemDiameter - 2 * scatterItemBorder,
scatterItemDiameter - 2 * scatterItemBorder);
return res;
}
// Annoying: we can create a QPixmap only after the application was initialized.
// Therefore, do this as a on-demand initialized pointer. A function local static
// variable does unnecesssary (in this case) thread synchronization.
static std::unique_ptr<QPixmap> scatterPixmapPtr;
static std::unique_ptr<QPixmap> scatterPixmapHighlightedPtr;
static const QPixmap &scatterPixmap(bool highlight)
{
if (!scatterPixmapPtr) {
scatterPixmapPtr.reset(new QPixmap(createScatterPixmap(fillColor, ::borderColor)));
scatterPixmapHighlightedPtr.reset(new QPixmap(createScatterPixmap(highlightedColor, highlightedBorderColor)));
}
return highlight ? *scatterPixmapHighlightedPtr : *scatterPixmapPtr;
}
ScatterSeries::Item::Item(QGraphicsScene *scene, ScatterSeries *series, dive *d, double pos, double value) :
item(createItemPtr<QGraphicsPixmapItem>(scene, scatterPixmap(false))),
d(d),
pos(pos),
value(value)
{
item->setZValue(ZValues::series);
updatePosition(series);
}
void ScatterSeries::Item::updatePosition(ScatterSeries *series)
{
QPointF center = series->toScreen(QPointF(pos, value));
item->setPos(center.x() - scatterItemDiameter / 2.0,
center.y() - scatterItemDiameter / 2.0);
}
void ScatterSeries::Item::highlight(bool highlight)
{
item->setPixmap(scatterPixmap(highlight));
}
void ScatterSeries::append(dive *d, double pos, double value)
{
items.emplace_back(scene, this, d, pos, value);
}
void ScatterSeries::updatePositions()
{
for (Item &item: items)
item.updatePosition(this);
}
static double sq(double f)
{
return f * f;
}
static double squareDist(const QPointF &p1, const QPointF &p2)
{
QPointF diff = p1 - p2;
return QPointF::dotProduct(diff, diff);
}
std::vector<int> ScatterSeries::getItemsUnderMouse(const QPointF &point) const
{
std::vector<int> res;
double x = point.x();
auto low = std::lower_bound(items.begin(), items.end(), x - scatterItemDiameter,
[] (const Item &item, double x) { return item.item->pos().x() < x; });
auto high = std::upper_bound(low, items.end(), x + scatterItemDiameter,
[] (double x, const Item &item) { return x < item.item->pos().x(); });
// Hopefully that narrows it down enough. For discrete scatter plots, we could also partition
// by equal x and do a binary search in these partitions. But that's probably not worth it.
res.reserve(high - low);
double minSquare = sq(scatterItemDiameter / 2.0 + scatterItemBorder);
for (auto it = low; it < high; ++it) {
QPointF pos = it->item->pos();
pos.rx() += scatterItemDiameter / 2.0 + scatterItemBorder;
pos.ry() += scatterItemDiameter / 2.0 + scatterItemBorder;
if (squareDist(pos, point) <= minSquare)
res.push_back(it - items.begin());
}
return res;
}
static QString dataInfo(const StatsVariable &var, const dive *d)
{
// For "numeric" variables, we display value and unit.
// For "discrete" variables, we display all categories the dive belongs to.
// There is only one "continuous" variable, the date, for which we don't display anything,
// because the date is displayed anyway.
QString val;
switch (var.type()) {
case StatsVariable::Type::Numeric:
val = var.valueWithUnit(d);
break;
case StatsVariable::Type::Discrete:
val = var.diveCategories(d);
break;
default:
return QString();
}
return QString("%1: %2").arg(var.name(), val);
}
// Highlight item when hovering over item
bool ScatterSeries::hover(QPointF pos)
{
std::vector<int> newHighlighted = getItemsUnderMouse(pos);
if (newHighlighted == highlighted) {
if (information)
information->setPos(pos);
return !newHighlighted.empty();
}
// This might be overkill: differential unhighlighting / highlighting of items.
for (int idx: highlighted) {
if (std::find(newHighlighted.begin(), newHighlighted.end(), idx) == newHighlighted.end())
items[idx].highlight(false);
}
for (int idx: newHighlighted) {
if (std::find(highlighted.begin(), highlighted.end(), idx) == highlighted.end())
items[idx].highlight(true);
}
highlighted = std::move(newHighlighted);
if (highlighted.empty()) {
information.reset();
return false;
} else {
if (!information)
information = createItemPtr<InformationBox>(scene);
std::vector<QString> text;
text.reserve(highlighted.size() * 5);
int show = information->recommendedMaxLines() / 5;
int shown = 0;
for (int idx: highlighted) {
const dive *d = items[idx].d;
if (!text.empty())
text.push_back(QString(" ")); // Argh. Empty strings are filtered away.
// We don't listen to undo-command signals, therefore we have to check whether that dive actually exists!
// TODO: fix this.
if (get_divenr(d) < 0) {
text.push_back(StatsTranslations::tr("Removed dive"));
} else {
text.push_back(StatsTranslations::tr("Dive #%1").arg(d->number));
text.push_back(get_dive_date_string(d->when));
text.push_back(dataInfo(varX, d));
text.push_back(dataInfo(varY, d));
}
if (++shown >= show && shown < (int)highlighted.size()) {
text.push_back(" ");
text.push_back(StatsTranslations::tr("and %1 more").arg((int)highlighted.size() - shown));
break;
}
}
information->setText(text, pos);
return true;
}
}
void ScatterSeries::unhighlight()
{
for (int idx: highlighted)
items[idx].highlight(false);
highlighted.clear();
}
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