Copyright (C) 2012, University of Cambridge, Department of Psychiatry.
Created by Rudolf Cardinal (email@example.com).
This file is part of CamCOPS.
CamCOPS is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
CamCOPS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with CamCOPS. If not, see <https://www.gnu.org/licenses/>.
// Implements a translation/rotation context for a QPainter.
// When the class is constructed, it (1) translates the painter by "at" and
// (2) rotates by "rotate_clockwise_deg". When it's destroyed, it reverses
// those transformations.
PainterTranslateRotateContext(QPainter& painter, const QPointF& at,