| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the documentation of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:BSD$ |
| ** Commercial License Usage |
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| ** BSD License Usage |
| ** Alternatively, you may use this file under the terms of the BSD license |
| ** as follows: |
| ** |
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| ****************************************************************************/ |
| |
| //! [0] |
| QPoint p; |
| |
| p.setX(p.x() + 1); |
| p += QPoint(1, 0); |
| p.rx()++; |
| //! [0] |
| |
| |
| //! [1] |
| QPoint p(1, 2); |
| p.rx()--; // p becomes (0, 2) |
| //! [1] |
| |
| |
| //! [2] |
| QPoint p(1, 2); |
| p.ry()++; // p becomes (1, 3) |
| //! [2] |
| |
| |
| //! [3] |
| QPoint p( 3, 7); |
| QPoint q(-1, 4); |
| p += q; // p becomes (2, 11) |
| //! [3] |
| |
| |
| //! [4] |
| QPoint p( 3, 7); |
| QPoint q(-1, 4); |
| p -= q; // p becomes (4, 3) |
| //! [4] |
| |
| |
| //! [5] |
| QPoint p(-1, 4); |
| p *= 2.5; // p becomes (-3, 10) |
| //! [5] |
| |
| |
| //! [16] |
| QPoint p( 3, 7); |
| QPoint q(-1, 4); |
| int lengthSquared = QPoint::dotProduct(p, q); // lengthSquared becomes 25 |
| //! [16] |
| |
| |
| //! [6] |
| QPoint p(-3, 10); |
| p /= 2.5; // p becomes (-1, 4) |
| //! [6] |
| |
| |
| //! [7] |
| QPoint oldPosition; |
| |
| MyWidget::mouseMoveEvent(QMouseEvent *event) |
| { |
| QPoint point = event->pos() - oldPosition; |
| if (point.manhattanLength() > 3) |
| // the mouse has moved more than 3 pixels since the oldPosition |
| } |
| //! [7] |
| |
| |
| //! [8] |
| double trueLength = std::sqrt(std::pow(x(), 2) + std::pow(y(), 2)); |
| //! [8] |
| |
| |
| //! [9] |
| QPointF p; |
| |
| p.setX(p.x() + 1.0); |
| p += QPointF(1.0, 0.0); |
| p.rx()++; |
| //! [9] |
| |
| |
| //! [10] |
| QPointF p(1.1, 2.5); |
| p.rx()--; // p becomes (0.1, 2.5) |
| //! [10] |
| |
| |
| //! [11] |
| QPointF p(1.1, 2.5); |
| p.ry()++; // p becomes (1.1, 3.5) |
| //! [11] |
| |
| |
| //! [12] |
| QPointF p( 3.1, 7.1); |
| QPointF q(-1.0, 4.1); |
| p += q; // p becomes (2.1, 11.2) |
| //! [12] |
| |
| |
| //! [13] |
| QPointF p( 3.1, 7.1); |
| QPointF q(-1.0, 4.1); |
| p -= q; // p becomes (4.1, 3.0) |
| //! [13] |
| |
| |
| //! [14] |
| QPointF p(-1.1, 4.1); |
| p *= 2.5; // p becomes (-2.75, 10.25) |
| //! [14] |
| |
| |
| //! [15] |
| QPointF p(-2.75, 10.25); |
| p /= 2.5; // p becomes (-1.1, 4.1) |
| //! [15] |
| |
| |
| //! [17] |
| QPointF p( 3.1, 7.1); |
| QPointF q(-1.0, 4.1); |
| int lengthSquared = QPointF::dotProduct(p, q); // lengthSquared becomes 26.01 |
| //! [17] |