53 lines
1.4 KiB
C++
53 lines
1.4 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 "ui/effects/toggle_arrow.h"
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#include <QtCore/QtMath>
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namespace Ui {
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[[nodiscard]] QPainterPath ToggleUpDownArrowPath(
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float64 x,
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float64 y,
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float64 size,
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float64 fourStrokes,
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float64 progress) {
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const auto size2 = size / 2.;
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const auto stroke = (fourStrokes / 4.) / M_SQRT2;
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const auto left = x - size;
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const auto right = x + size;
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const auto bottom = y + size2;
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constexpr auto kPointCount = 6;
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auto points = std::array<QPointF, kPointCount>{ {
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{ left - stroke, bottom - stroke },
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{ x, bottom - stroke - size - stroke },
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{ right + stroke, bottom - stroke },
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{ right - stroke, bottom + stroke },
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{ x, bottom + stroke - size + stroke },
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{ left + stroke, bottom + stroke }
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} };
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const auto alpha = (progress - 1.) * M_PI;
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const auto cosalpha = cos(alpha);
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const auto sinalpha = sin(alpha);
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for (auto &point : points) {
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auto px = point.x() - x;
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auto py = point.y() - y;
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point.setX(x + px * cosalpha - py * sinalpha);
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point.setY(y + py * cosalpha + px * sinalpha);
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}
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auto path = QPainterPath();
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path.moveTo(points.front());
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for (int i = 1; i != kPointCount; ++i) {
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path.lineTo(points[i]);
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}
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path.lineTo(points.front());
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return path;
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}
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} // namespace Ui
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