Added ability to paint horizontal lines for double linear charts.

Telegram/SourceFiles/statistics/chart_horizontal_lines_data.cpp

@@ -21,12 +21,19 @@ constexpr auto kStep = 5.;
 	return (k % 10 == 0) ? maxValue : ((maxValue / 10 + 1) * 10);
 }
 
+[[nodiscard]] QString Format(int absoluteValue) {
+	return (absoluteValue >= 10'000)
+		? Lang::FormatCountToShort(absoluteValue).string
+		: QString("%L1").arg(absoluteValue);
+}
+
 } // namespace
 
 ChartHorizontalLinesData::ChartHorizontalLinesData(
 		int newMaxHeight,
 		int newMinHeight,
-		bool useMinHeight) {
+		bool useMinHeight,
+		float64 rightRatio) {
 	if (!useMinHeight) {
 		const auto v = (newMaxHeight > 100)
 			? Round(newMaxHeight)
@@ -78,14 +85,21 @@ ChartHorizontalLinesData::ChartHorizontalLinesData(
 
 		lines.resize(n);
 		const auto diffAbsoluteValue = int((n - 1) * step);
+		const auto skipFloatValues = (step / rightRatio) < 1;
 		for (auto i = 0; i < n; i++) {
 			auto &line = lines[i];
 			const auto value = int(i * step);
 			line.absoluteValue = newMinHeight + value;
 			line.relativeValue = 1. - value / float64(diffAbsoluteValue);
-			line.caption = (line.absoluteValue >= 10'000)
-				? Lang::FormatCountToShort(line.absoluteValue).string
-				: QString("%L1").arg(line.absoluteValue);
+			line.caption = Format(line.absoluteValue);
+			if (rightRatio > 0) {
+				const auto v = (newMinHeight + i * step) / rightRatio;
+				line.scaledLineCaption = (!skipFloatValues)
+					? Format(v)
+					: ((v - int(v)) < 0.01)
+					? Format(v)
+					: QString();
+			}
 		}
 	}
 }

Telegram/SourceFiles/statistics/chart_horizontal_lines_data.h

@@ -14,7 +14,8 @@ public:
 	ChartHorizontalLinesData(
 		int newMaxHeight,
 		int newMinHeight,
-		bool useMinHeight);
+		bool useMinHeight,
+		float64 rightRatio);
 
 	void computeRelative(
 		int newMaxHeight,
@@ -26,6 +27,8 @@ public:
 		float64 absoluteValue = 0.;
 		float64 relativeValue = 0.;
 		QString caption;
+		QString scaledLineCaption;
+		float64 rightCaptionWidth = 0.;
 	};
 
 	std::vector<Line> lines;

Telegram/SourceFiles/statistics/view/chart_horizontal_lines_view.cpp

@@ -18,10 +18,21 @@ ChartHorizontalLinesView::ChartHorizontalLinesView() = default;
 void ChartHorizontalLinesView::setChartData(
 		const Data::StatisticalChart &chartData,
 		ChartViewType type) {
+	_horizontalLines.clear();
 	_isDouble = (type == ChartViewType::DoubleLinear);
 	if (_isDouble && (chartData.lines.size() == 2)) {
-		_leftColor = chartData.lines.front().color;
-		_rightColor = chartData.lines.back().color;
+		_leftPen = QPen(chartData.lines.front().color);
+		_rightPen = QPen(chartData.lines.back().color);
+
+		const auto firstMax = chartData.lines.front().maxValue;
+		const auto secondMax = chartData.lines.back().maxValue;
+		if (firstMax > secondMax) {
+			_isLeftLineScaled = false;
+			_scaledLineRatio = firstMax / float64(secondMax);
+		} else {
+			_isLeftLineScaled = true;
+			_scaledLineRatio = secondMax / float64(firstMax);
+		}
 	}
 }
 
@@ -46,16 +57,31 @@ void ChartHorizontalLinesView::paintHorizontalLines(
 void ChartHorizontalLinesView::paintCaptionsToHorizontalLines(
 		QPainter &p,
 		const QRect &r) {
+	const auto offset = r.y() - st::statisticsChartHorizontalLineCaptionSkip;
+	p.setFont(st::statisticsDetailsBottomCaptionStyle.font);
 	for (auto &horizontalLine : _horizontalLines) {
 		const auto alpha = p.opacity();
 		p.setOpacity(horizontalLine.alpha);
-		p.setFont(st::statisticsDetailsBottomCaptionStyle.font);
-		p.setPen(st::windowSubTextFg);
-		const auto offset = r.y()
-			- st::statisticsChartHorizontalLineCaptionSkip;
 		for (const auto &line : horizontalLine.lines) {
 			const auto y = offset + r.height() * line.relativeValue;
-			p.drawText(0, y, line.caption);
+			p.setPen(_isDouble ? _leftPen : st::windowSubTextFg);
+			p.drawText(
+				0,
+				y,
+				(!_isDouble)
+					? line.caption
+					: _isLeftLineScaled
+					? line.scaledLineCaption
+					: line.caption);
+			if (_isDouble) {
+				p.setPen(_rightPen);
+				p.drawText(
+					r.width() - line.rightCaptionWidth,
+					y,
+					_isLeftLineScaled
+						? line.caption
+						: line.scaledLineCaption);
+			}
 		}
 		p.setOpacity(alpha);
 	}
@@ -87,10 +113,19 @@ void ChartHorizontalLinesView::setAlpha(float64 value) {
 }
 
 void ChartHorizontalLinesView::add(Limits newHeight, bool animated) {
-	const auto newLinesData = ChartHorizontalLinesData(
+	auto newLinesData = ChartHorizontalLinesData(
 		newHeight.max,
 		newHeight.min,
-		true);
+		true,
+		_isDouble ? _scaledLineRatio : 0.);
+	if (_isDouble) {
+		const auto &font = st::statisticsDetailsBottomCaptionStyle.font;
+		for (auto &line : newLinesData.lines) {
+			line.rightCaptionWidth = font->width(_isLeftLineScaled
+				? line.caption
+				: line.scaledLineCaption);
+		}
+	}
 	if (!animated) {
 		_horizontalLines.clear();
 	}

Telegram/SourceFiles/statistics/view/chart_horizontal_lines_view.h

@@ -36,11 +36,14 @@ public:
 
 private:
 	bool _isDouble = false;
-	QColor _leftColor;
-	QColor _rightColor;
+	QPen _leftPen;
+	QPen _rightPen;
 
 	std::vector<ChartHorizontalLinesData> _horizontalLines;
 
+	float64 _scaledLineRatio = 0.;
+	bool _isLeftLineScaled = false;
+
 };
 
 } // namespace Statistic