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95f3ea2f6d
Drop 1:2.5: on a grid of 10 it steps by 4, which misses 10, so texts on two elements 10 apart could never line up. Every remaining divisor is a whole number, which tst_textgrid checks. The divisor list and the snapping arithmetic move to the header-only textgrid.h so the toolbar menu, the preferences page and the test share them. The preferences page gets the same choice under Grille + Clavier; QETApp::textGridChanged keeps every editor's toolbar button in step. While element texts are dragged, the status bar names the text grid and says to release Shift and hold Ctrl for free placement -- Ctrl+Shift together is the pan shortcut. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01G2d2Zi8BfrYRPX88zhaoFG
63 lines
2.0 KiB
C++
63 lines
2.0 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 TEXTGRID_H
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#define TEXTGRID_H
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#include <QList>
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#include <QPointF>
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#include <QString>
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#include <QtMath>
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/**
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The text grid: the step texts snap to when dragged with the mouse,
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a fraction of the folio grid. A divisor of 1 is the folio grid itself,
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0 means no grid. Because every step divides the folio grid, a text
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snapped to it still lines up with every element and with the texts
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of other elements.
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*/
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namespace TextGrid
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{
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/// The choices offered in the menu and the preferences, 0 first.
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inline const QList<qreal> divisors{0, 1, 2, 5, 10};
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/// QSettings key holding the divisor.
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inline const QString settings_key{QStringLiteral("diagrameditor/text_grid_divisor")};
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/// "1:5" for 5. Not meaningful for 0.
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inline QString ratioLabel(qreal divisor) {
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return QStringLiteral("1:") + QString::number(divisor);
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}
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/**
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@return p snapped to a grid of x_grid / divisor by y_grid / divisor,
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or rounded to the nearest pixel when divisor is 0 or less.
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*/
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inline QPointF snap(const QPointF &p, int x_grid, int y_grid, qreal divisor)
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{
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if (divisor <= 0 || x_grid <= 0 || y_grid <= 0)
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return QPointF(qRound(p.x()), qRound(p.y()));
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const qreal x_step = x_grid / divisor;
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const qreal y_step = y_grid / divisor;
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return QPointF(qRound(p.x() / x_step) * x_step,
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qRound(p.y() / y_step) * y_step);
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}
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}
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#endif // TEXTGRID_H
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