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Telegram/SourceFiles/data/data_statistics_chart.cpp

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "data/data_statistics_chart.h"
+
+#include "statistics/statistics_format_values.h"
+#include "styles/style_basic.h"
+#include "styles/style_statistics.h"
+
+#include <QtCore/QDateTime>
+#include <QtCore/QLocale>
+
+namespace Data {
+
+void StatisticalChart::measure() {
+	if (x.empty()) {
+		return;
+	}
+	const auto n = x.size();
+	const auto start = x.front();
+	const auto end = x.back();
+
+	xPercentage.clear();
+	xPercentage.resize(n);
+	if (n == 1) {
+		xPercentage[0] = 1;
+	} else {
+		for (auto i = 0; i < n; i++) {
+			xPercentage[i] = (x[i] - start) / float64(end - start);
+		}
+	}
+
+	for (auto &line : lines) {
+		if (line.maxValue > maxValue) {
+			maxValue = line.maxValue;
+		}
+		if (line.minValue < minValue) {
+			minValue = line.minValue;
+		}
+		line.segmentTree = Statistic::SegmentTree(line.y);
+	}
+
+	daysLookup.clear();
+	const auto dateCount = int((end - start) / timeStep) + 10;
+	daysLookup.reserve(dateCount);
+	constexpr auto kOneDay = 3600 * 24 * 1000;
+
+	// View data.
+	auto maxWidth = 0;
+	const auto &defaultFont = st::statisticsDetailsBottomCaptionStyle.font;
+
+	for (auto i = 0; i < dateCount; i++) {
+		const auto r = (start + (i * timeStep)) / 1000;
+		if (timeStep == 1) {
+			daysLookup.push_back(
+				QString(((i < 10) ? u"0%1:00"_q : u"%1:00"_q).arg(i)));
+		} else if (timeStep < kOneDay) {
+			const auto dateTime = QDateTime::fromSecsSinceEpoch(r);
+			daysLookup.push_back(u"%1:%2"_q
+				.arg(dateTime.time().hour(), 2, 10, QChar('0'))
+				.arg(dateTime.time().minute(), 2, 10, QChar('0')));
+		} else {
+			daysLookup.push_back(Statistic::LangDayMonth(r));
+		}
+		maxWidth = std::max(maxWidth, defaultFont->width(daysLookup.back()));
+	}
+	dayStringMaxWidth = maxWidth;
+
+	oneDayPercentage = timeStep / float64(end - start);
+}
+
+QString StatisticalChart::getDayString(int i) const {
+	return daysLookup[int((x[i] - x[0]) / timeStep)];
+}
+
+int StatisticalChart::findStartIndex(float64 v) const {
+	if (!v) {
+		return 0;
+	}
+	const auto n = int(xPercentage.size());
+
+	if (n < 2) {
+		return 0;
+	}
+	auto left = 0;
+	auto right = n - 1;
+
+	while (left <= right) {
+		const auto middle = (right + left) >> 1;
+		if (v < xPercentage[middle]
+			&& (!middle || (v > xPercentage[middle - 1]))) {
+			return middle;
+		}
+		if (v == xPercentage[middle]) {
+			return middle;
+		}
+		if (v < xPercentage[middle]) {
+			right = middle - 1;
+		} else if (v > xPercentage[middle]) {
+			left = middle + 1;
+		}
+	}
+	return left;
+}
+
+int StatisticalChart::findEndIndex(int left, float64 v) const {
+	const auto wasLeft = left;
+	const auto n = int(xPercentage.size());
+	if (v == 1.) {
+		return n - 1;
+	}
+	auto right = n - 1;
+
+	while (left <= right) {
+		const auto middle = (right + left) >> 1;
+		if (v > xPercentage[middle]
+			&& ((middle == n - 1) || (v < xPercentage[middle + 1]))) {
+			return middle;
+		}
+		if (v == xPercentage[middle]) {
+			return middle;
+		}
+		if (v < xPercentage[middle]) {
+			right = middle - 1;
+		} else if (v > xPercentage[middle]) {
+			left = middle + 1;
+		}
+	}
+	return std::max(wasLeft, right);
+}
+
+
+int StatisticalChart::findIndex(int left, int right, float64 v) const {
+	const auto n = int(xPercentage.size());
+
+	if (v <= xPercentage[left]) {
+		return left;
+	}
+	if (v >= xPercentage[right]) {
+		return right;
+	}
+
+	while (left <= right) {
+		const auto middle = (right + left) >> 1;
+		if (v > xPercentage[middle]
+			&& ((middle == n - 1) || (v < xPercentage[middle + 1]))) {
+			return middle;
+		}
+
+		if (v == xPercentage[middle]) {
+			return middle;
+		}
+		if (v < xPercentage[middle]) {
+			right = middle - 1;
+		} else if (v > xPercentage[middle]) {
+			left = middle + 1;
+		}
+	}
+	return right;
+}
+
+} // namespace Data