tdesktop/Telegram/SourceFiles/statistics/view/stack_chart_common.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 "statistics/view/stack_chart_common.h"
#include "data/data_statistics_chart.h"
#include "statistics/statistics_common.h"
#include "ui/effects/animation_value_f.h"
namespace Statistic {
LeftStartAndStep ComputeLeftStartAndStep(
const Data::StatisticalChart &chartData,
const Limits &xPercentageLimits,
const QRect &rect,
float64 xIndexStart) {
const auto fullWidth = rect.width()
/ (xPercentageLimits.max - xPercentageLimits.min);
const auto offset = fullWidth * xPercentageLimits.min;
const auto p = (chartData.xPercentage.size() < 2)
? 1.
: chartData.xPercentage[1] * fullWidth;
const auto w = chartData.xPercentage[1] * (fullWidth - p);
const auto leftStart = rect.x()
+ chartData.xPercentage[xIndexStart] * (fullWidth - p)
- offset;
return { leftStart, w };
}
Limits FindStackXIndicesFromRawXPercentages(
const Data::StatisticalChart &chartData,
const Limits &rawXPercentageLimits,
const Limits &zoomedInLimitXIndices) {
const auto zoomLimit = Limits{
chartData.xPercentage[zoomedInLimitXIndices.min],
chartData.xPercentage[zoomedInLimitXIndices.max],
};
// Due to a specificity of the stack chart plotting,
// the right edge has a special offset to the left.
// This reduces the number of displayed points by 1,
// but allows the last point to be displayed.
const auto offset = (zoomLimit.max == 1.) ? 0 : -1;
const auto minIt = ranges::upper_bound(
chartData.xPercentage,
anim::interpolateF(
zoomLimit.min,
zoomLimit.max,
rawXPercentageLimits.min));
const auto maxIt = ranges::upper_bound(
chartData.xPercentage,
anim::interpolateF(
zoomLimit.min,
zoomLimit.max,
rawXPercentageLimits.max));
const auto start = begin(chartData.xPercentage);
return {
.min = std::clamp(
float64(std::distance(start, minIt) + offset),
zoomedInLimitXIndices.min,
zoomedInLimitXIndices.max),
.max = std::clamp(
float64(std::distance(start, maxIt) + offset),
zoomedInLimitXIndices.min,
zoomedInLimitXIndices.max),
};
}
} // namespace Statistic