134 lines
3.3 KiB
C++
134 lines
3.3 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#include "statistics/chart_rulers_data.h"
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#include "lang/lang_tag.h"
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namespace Statistic {
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namespace {
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constexpr auto kMinLines = ChartValue(2);
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constexpr auto kMaxLines = ChartValue(6);
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constexpr auto kStep = 5.;
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[[nodiscard]] ChartValue Round(ChartValue maxValue) {
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const auto k = ChartValue(maxValue / kStep);
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return (k % 10 == 0) ? maxValue : ((maxValue / 10 + 1) * 10);
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}
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[[nodiscard]] QString Format(ChartValue absoluteValue) {
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constexpr auto kTooMuch = ChartValue(10'000);
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return (absoluteValue >= kTooMuch)
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? Lang::FormatCountToShort(absoluteValue).string
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: QString::number(absoluteValue);
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}
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} // namespace
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ChartRulersData::ChartRulersData(
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ChartValue newMaxHeight,
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ChartValue newMinHeight,
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bool useMinHeight,
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float64 rightRatio,
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Fn<QString(float64)> leftCustomCaption,
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Fn<QString(float64)> rightCustomCaption) {
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if (!useMinHeight) {
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const auto v = (newMaxHeight > 100)
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? Round(newMaxHeight)
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: newMaxHeight;
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const auto step = std::max(
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ChartValue(1),
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ChartValue(std::ceil(v / kStep)));
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auto n = kMaxLines;
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if (v < kMaxLines) {
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n = std::max(2, int(v + 1));
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} else if (v / 2 < kMaxLines) {
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n = v / 2 + 1;
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if (v % 2 != 0) {
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n++;
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}
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}
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lines.resize(n);
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for (auto i = 1; i < n; i++) {
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auto &line = lines[i];
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line.absoluteValue = i * step;
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line.caption = Lang::FormatCountToShort(
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line.absoluteValue).string;
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}
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} else {
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auto n = int(0);
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const auto diff = newMaxHeight - newMinHeight;
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auto step = 0.;
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if (diff == 0) {
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newMinHeight--;
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n = kMaxLines / 2;
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step = 1.;
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} else if (diff < kMaxLines) {
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n = std::max(kMinLines, diff + 1);
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step = 1.;
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} else if (diff / 2 < kMaxLines) {
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n = diff / 2 + diff % 2 + 1;
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step = 2.;
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} else {
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step = (newMaxHeight - newMinHeight) / kStep;
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if (step <= 0) {
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step = 1;
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n = std::max(kMinLines, newMaxHeight - newMinHeight + 1);
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} else {
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n = 6;
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}
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}
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lines.resize(n);
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const auto diffAbsoluteValue = ChartValue((n - 1) * step);
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const auto skipFloatValues = (step / rightRatio) < 1;
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for (auto i = 0; i < n; i++) {
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auto &line = lines[i];
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const auto value = ChartValue(i * step);
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line.absoluteValue = newMinHeight + value;
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line.relativeValue = 1. - value / float64(diffAbsoluteValue);
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line.caption = leftCustomCaption
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? leftCustomCaption(line.absoluteValue)
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: Format(line.absoluteValue);
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if (rightRatio > 0 || rightCustomCaption) {
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const auto v = (newMinHeight + i * step) / rightRatio;
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line.scaledLineCaption = rightCustomCaption
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? rightCustomCaption(line.absoluteValue)
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: (!skipFloatValues)
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? Format(v)
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: ((v - ChartValue(v)) < 0.01)
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? Format(v)
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: QString();
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}
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}
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}
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}
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void ChartRulersData::computeRelative(
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ChartValue newMaxHeight,
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ChartValue newMinHeight) {
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for (auto &line : lines) {
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line.relativeValue = 1.
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- ((line.absoluteValue - newMinHeight)
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/ (newMaxHeight - newMinHeight));
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}
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}
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ChartValue ChartRulersData::LookupHeight(ChartValue maxValue) {
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const auto v = (maxValue > 100) ? Round(maxValue) : maxValue;
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const auto step = ChartValue(std::ceil(v / kStep));
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return step * kStep;
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}
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} // namespace Statistic
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