Added ability to use BarChartView as non-stack as well.

Telegram/SourceFiles/info/statistics/info_statistics_inner_widget.cpp

@@ -189,11 +189,11 @@ void FillStatistic(
 		addChart(
 			stats.channel.viewCountBySourceGraph,
 			tr::lng_chart_title_view_count_by_source(),
-			Type::Stack);
+			Type::StackBar);
 		addChart(
 			stats.channel.joinBySourceGraph,
 			tr::lng_chart_title_join_by_source(),
-			Type::Stack);
+			Type::StackBar);
 		addChart(
 			stats.channel.languageGraph,
 			tr::lng_chart_title_language(),
@@ -218,7 +218,7 @@ void FillStatistic(
 		addChart(
 			stats.supergroup.joinBySourceGraph,
 			tr::lng_chart_title_group_join_by_source(),
-			Type::Stack);
+			Type::StackBar);
 		addChart(
 			stats.supergroup.languageGraph,
 			tr::lng_chart_title_group_language(),
@@ -226,7 +226,7 @@ void FillStatistic(
 		addChart(
 			stats.supergroup.messageContentGraph,
 			tr::lng_chart_title_group_message_content(),
-			Type::Stack);
+			Type::StackBar);
 		addChart(
 			stats.supergroup.actionGraph,
 			tr::lng_chart_title_group_action(),

Telegram/SourceFiles/statistics/chart_widget.cpp

@@ -1462,7 +1462,7 @@ void ChartWidget::setChartData(
 	_chartView = CreateChartView(type);
 	_chartView->setLinesFilterController(_linesFilterController);
 	_rulersView.setChartData(_chartData, type, _linesFilterController);
-	_areRulersAbove = (type == ChartViewType::Stack);
+	_areRulersAbove = (type == ChartViewType::StackBar);
 
 	if (_chartData.isFooterHidden) {
 		_footer->hide();

Telegram/SourceFiles/statistics/statistics_common.h

@@ -18,7 +18,8 @@ struct Limits final {
 
 enum class ChartViewType {
 	Linear,
-	Stack,
+	Bar,
+	StackBar,
 	DoubleLinear,
 	StackLinear,
 };

Telegram/SourceFiles/statistics/view/bar_chart_view.cpp

@@ -12,10 +12,16 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "statistics/view/stack_chart_common.h"
 #include "ui/effects/animation_value_f.h"
 #include "ui/painter.h"
+#include "ui/rect.h"
+#include "styles/style_statistics.h"
 
 namespace Statistic {
 
-BarChartView::BarChartView() = default;
+BarChartView::BarChartView(bool isStack)
+: _isStack(isStack)
+, _cachedLineRatios(false) {
+}
+
 BarChartView::~BarChartView() = default;
 
 void BarChartView::paint(QPainter &p, const PaintContext &c) {
@@ -40,6 +46,8 @@ void BarChartView::paintChartAndSelected(
 		c.rect,
 		localStart);
 
+	p.setClipRect(0, 0, c.rect.width() * 2, rect::bottom(c.rect));
+
 	const auto opacity = p.opacity();
 	auto hq = PainterHighQualityEnabler(p);
 
@@ -47,7 +55,9 @@ void BarChartView::paintChartAndSelected(
 		localEnd - localStart + 1,
 		-c.rect.y());
 	auto selectedBottoms = std::vector<float64>();
-	const auto hasSelectedXIndex = !c.footer && (_lastSelectedXIndex >= 0);
+	const auto hasSelectedXIndex = _isStack
+		&& !c.footer
+		&& (_lastSelectedXIndex >= 0);
 	if (hasSelectedXIndex) {
 		selectedBottoms = std::vector<float64>(c.chartData.lines.size(), 0);
 		constexpr auto kSelectedAlpha = 0.5;
@@ -77,10 +87,27 @@ void BarChartView::paintChartAndSelected(
 			if (hasSelectedXIndex && (x == _lastSelectedXIndex)) {
 				selectedBottoms[i] = column.y();
 			}
-			path.addRect(column);
-			bottoms[bottomIndex] += yPoint;
+			if (_isStack) {
+				path.addRect(column);
+				bottoms[bottomIndex] += yPoint;
+			} else {
+				if (path.isEmpty()) {
+					path.moveTo(column.topLeft());
+				} else {
+					path.lineTo(column.topLeft());
+				}
+				if (x == localEnd) {
+					path.lineTo(c.rect.width(), column.y());
+				} else {
+					path.lineTo(rect::right(column), column.y());
+				}
+			}
+		}
+		if (_isStack) {
+			p.fillPath(path, line.color);
+		} else {
+			p.strokePath(path, line.color);
 		}
-		p.fillPath(path, line.color);
 	}
 
 	for (auto i = 0; i < selectedBottoms.size(); i++) {
@@ -103,6 +130,8 @@ void BarChartView::paintChartAndSelected(
 			yPoint);
 		p.fillRect(column, line.color);
 	}
+
+	p.setClipping(false);
 }
 
 void BarChartView::paintSelectedXIndex(
@@ -113,8 +142,73 @@ void BarChartView::paintSelectedXIndex(
 	const auto was = _lastSelectedXIndex;
 	_lastSelectedXIndex = selectedXIndex;
 	_lastSelectedXProgress = progress;
-	if ((_lastSelectedXIndex >= 0) || (was >= 0)) {
-		BarChartView::paintChartAndSelected(p, c);
+
+	if (_isStack) {
+		if ((_lastSelectedXIndex >= 0) || (was >= 0)) {
+			BarChartView::paintChartAndSelected(p, c);
+		}
+	} else {
+		const auto linesFilter = linesFilterController();
+		auto hq = PainterHighQualityEnabler(p);
+		auto o = ScopedPainterOpacity(p, progress);
+		p.setBrush(st::boxBg);
+		const auto r = st::statisticsDetailsDotRadius;
+		const auto i = selectedXIndex;
+		const auto isSameToken = _selectedPoints.isSame(selectedXIndex, c);
+		auto linePainted = false;
+
+		const auto &[localStart, localEnd] = _lastPaintedXIndices;
+		const auto &[leftStart, w] = ComputeLeftStartAndStep(
+			c.chartData,
+			c.xPercentageLimits,
+			c.rect,
+			localStart);
+
+		for (auto i = 0; i < c.chartData.lines.size(); i++) {
+			const auto &line = c.chartData.lines[i];
+			const auto lineAlpha = linesFilter->alpha(line.id);
+			const auto useCache = isSameToken
+				|| (lineAlpha < 1. && !linesFilter->isEnabled(line.id));
+			if (!useCache) {
+				// Calculate.
+				const auto x = _lastSelectedXIndex;
+				const auto yPercentage = (line.y[x] - c.heightLimits.min)
+					/ float64(c.heightLimits.max - c.heightLimits.min);
+				const auto yPoint = (1. - yPercentage) * c.rect.height();
+
+				const auto bottomIndex = x - localStart;
+				const auto column = QRectF(
+					leftStart + (x - localStart) * w,
+					c.rect.height() - 0 - yPoint,
+					w,
+					yPoint);
+				const auto xPoint = column.left() + column.width() / 2.;
+				_selectedPoints.points[line.id] = QPointF(xPoint, yPoint)
+					+ c.rect.topLeft();
+			}
+
+			if (!linePainted && lineAlpha) {
+				[[maybe_unused]] const auto o = ScopedPainterOpacity(
+					p,
+					p.opacity() * progress * kRulerLineAlpha);
+				const auto lineRect = QRectF(
+					begin(_selectedPoints.points)->second.x()
+						- (st::lineWidth / 2.),
+					c.rect.y(),
+					st::lineWidth,
+					c.rect.height());
+				p.fillRect(lineRect, st::boxTextFg);
+				linePainted = true;
+			}
+
+			// Paint.
+			auto o = ScopedPainterOpacity(p, lineAlpha * p.opacity());
+			p.setPen(QPen(line.color, st::statisticsChartLineWidth));
+			p.drawEllipse(_selectedPoints.points[line.id], r, r);
+		}
+		_selectedPoints.lastXIndex = selectedXIndex;
+		_selectedPoints.lastHeightLimits = c.heightLimits;
+		_selectedPoints.lastXLimits = c.xPercentageLimits;
 	}
 }
 
@@ -147,6 +241,17 @@ int BarChartView::findXIndexByPosition(
 AbstractChartView::HeightLimits BarChartView::heightLimits(
 		Data::StatisticalChart &chartData,
 		Limits xIndices) {
+	if (!_isStack) {
+		if (!_cachedLineRatios) {
+			_cachedLineRatios.init(chartData);
+		}
+
+		return DefaultHeightLimits(
+			_cachedLineRatios,
+			linesFilterController(),
+			chartData,
+			xIndices);
+	}
 	_cachedHeightLimits = {};
 	if (_cachedHeightLimits.ySum.empty()) {
 		_cachedHeightLimits.ySum.reserve(chartData.x.size());

Telegram/SourceFiles/statistics/view/bar_chart_view.h

@@ -22,7 +22,7 @@ struct Limits;
 
 class BarChartView final : public AbstractChartView {
 public:
-	BarChartView();
+	BarChartView(bool isStack);
 	~BarChartView() override final;
 
 	void paint(QPainter &p, const PaintContext &c) override;
@@ -52,10 +52,14 @@ private:
 		SegmentTree ySumSegmentTree;
 	} _cachedHeightLimits;
 
+	const bool _isStack;
+	DoubleLineRatios _cachedLineRatios; // Non-stack.
 	Limits _lastPaintedXIndices;
 	int _lastSelectedXIndex = -1;
 	float64 _lastSelectedXProgress = 0;
 
+	CachedSelectedPoints _selectedPoints; // Non-stack.
+
 };
 
 } // namespace Statistic

Telegram/SourceFiles/statistics/view/chart_view_factory.cpp

@@ -19,8 +19,11 @@ std::unique_ptr<AbstractChartView> CreateChartView(ChartViewType type) {
 	case ChartViewType::Linear: {
 		return std::make_unique<LinearChartView>(false);
 	} break;
-	case ChartViewType::Stack: {
-		return std::make_unique<BarChartView>();
+	case ChartViewType::Bar: {
+		return std::make_unique<BarChartView>(false);
+	} break;
+	case ChartViewType::StackBar: {
+		return std::make_unique<BarChartView>(true);
 	} break;
 	case ChartViewType::DoubleLinear: {
 		return std::make_unique<LinearChartView>(true);