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bd5cff4211
Follow-up to the positionKey() fix merged directly in #779
(b2f4ef5d2): per review request, add a small regression test so this
class of bug (fixed-precision "%.4f" formatting compares out of
numeric order once the integer part's digit count differs) can't
silently reappear.
positionKey()/coordinateKey() move out of diagram.cpp's anonymous
namespace into a small header-only diagramsortkeys.h so the test can
link against the exact same code Diagram::toXml() uses, instead of
duplicating the algorithm. Behavior is unchanged.
tst_diagramsortkeys covers: single- vs double-digit, double- vs
triple-digit, negative-vs-negative, negative-vs-positive, and
negative-vs-zero coordinate pairs, plus sub-precision deltas.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
54 lines
1.9 KiB
C++
54 lines
1.9 KiB
C++
/*
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Copyright 2006-2026 The QElectroTech Team
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This file is part of QElectroTech.
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QElectroTech is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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QElectroTech is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with QElectroTech. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef DIAGRAMSORTKEYS_H
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#define DIAGRAMSORTKEYS_H
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#include <QPointF>
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#include <QString>
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#include <QtGlobal>
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/// Sort-key helpers used by Diagram::toXml() to serialize elements and
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/// conductors in a deterministic order. Pulled into their own header
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/// (instead of an anonymous namespace in diagram.cpp) so they can be
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/// unit-tested directly -- see tests/qttest/tst_diagramsortkeys.cpp.
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namespace DiagramSortKeys {
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/// Format a coordinate as a string that sorts the same way the number
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/// does. Plain fixed-precision formatting ("%.4f") does NOT do this --
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/// e.g. "15.0000" sorts before "5.0000" as text even though 15 > 5 --
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/// so shift into a non-negative range and zero-pad to a fixed width
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/// before comparing.
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inline QString coordinateKey(double v)
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{
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//Diagram coordinates are nowhere near this range; the offset and
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//width just need to be big enough that shifted values are always
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//non-negative and always the same digit count.
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constexpr double offset = 1e9;
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qint64 scaled = qint64(qRound64((v + offset) * 10000.0));
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return QStringLiteral("%1").arg(scaled, 20, 10, QLatin1Char('0'));
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}
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inline QString positionKey(const QPointF &pos)
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{
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return coordinateKey(pos.x()) + QLatin1Char('|') + coordinateKey(pos.y());
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}
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}
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#endif
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