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Below 100 % ElementView::drawBackground() hid the grid and also set the snap step to 1 unit, so anything dragged while zoomed out landed off the grid with nothing on screen to show it. A large symbol opens fitted to the window below 100 %, which is why the report also says "when the selection is big". Keep hiding the grid below 100 % (its dots would merge into a grey wash), but snap every 10 units, as at 100 %. The zoom-to-grid rule moves into a header-only ElementViewGrid so it can be tested without an editor window, like textgrid.h. Checked in the editor: a one-rectangle symbol zoomed out to about 0.6x, its edge dragged by (15, 10) px and saved: master moves it by (28, 18), this branch by (30, 20). tst_elementviewgrid fails with the old step 1 and passes now; ctest 45/45. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
61 lines
1.7 KiB
C
61 lines
1.7 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 ELEMENTVIEWGRID_H
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#define ELEMENTVIEWGRID_H
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#include <QtGlobal>
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/**
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The symbol editor's grid at a given zoom: the step parts snap to, and
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how the grid is drawn. The step gets finer as the view zooms in, so a
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small detail can be placed precisely.
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Below 100 % the grid is not drawn (its dots would merge into a grey
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wash), but parts still snap every 10 units, as at 100 %. Snapping to 1
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unit there left everything dragged while zoomed out off the grid, with
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nothing on screen to show it (bugtracker #112).
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*/
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struct ElementViewGrid
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{
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int step = 10;
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bool draw_grid = true;
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bool draw_cross = false;
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static ElementViewGrid forZoom(qreal zoom_factor)
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{
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ElementViewGrid grid;
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if (zoom_factor < 1.0) {
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grid.draw_grid = false;
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} else if (zoom_factor < 4.0) {
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grid.step = 10;
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} else if (zoom_factor < 8.0) {
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grid.step = 5;
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grid.draw_cross = true;
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} else if (zoom_factor < 10.0) {
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grid.step = 2;
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grid.draw_cross = true;
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} else {
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grid.step = 1;
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grid.draw_cross = true;
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}
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return grid;
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}
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};
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#endif // ELEMENTVIEWGRID_H
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