comparison: src/callout.cpp
src/callout.cpp
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- a730825bc5e4
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| 1 /**************************************************************************** | |
| 2 ** | |
| 3 ** Copyright (C) 2016 The Qt Company Ltd. | |
| 4 ** Contact: https://www.qt.io/licensing/ | |
| 5 ** | |
| 6 ** This file is part of the Qt Charts module of the Qt Toolkit. | |
| 7 ** | |
| 8 ** $QT_BEGIN_LICENSE:GPL$ | |
| 9 ** Commercial License Usage | |
| 10 ** Licensees holding valid commercial Qt licenses may use this file in | |
| 11 ** accordance with the commercial license agreement provided with the | |
| 12 ** Software or, alternatively, in accordance with the terms contained in | |
| 13 ** a written agreement between you and The Qt Company. For licensing terms | |
| 14 ** and conditions see https://www.qt.io/terms-conditions. For further | |
| 15 ** information use the contact form at https://www.qt.io/contact-us. | |
| 16 ** | |
| 17 ** GNU General Public License Usage | |
| 18 ** Alternatively, this file may be used under the terms of the GNU | |
| 19 ** General Public License version 3 or (at your option) any later version | |
| 20 ** approved by the KDE Free Qt Foundation. The licenses are as published by | |
| 21 ** the Free Software Foundation and appearing in the file LICENSE.GPL3 | |
| 22 ** included in the packaging of this file. Please review the following | |
| 23 ** information to ensure the GNU General Public License requirements will | |
| 24 ** be met: https://www.gnu.org/licenses/gpl-3.0.html. | |
| 25 ** | |
| 26 ** $QT_END_LICENSE$ | |
| 27 ** | |
| 28 ****************************************************************************/ | |
| 29 | |
| 30 #include "callout.h" | |
| 31 #include <QtGui/QPainter> | |
| 32 #include <QtGui/QFontMetrics> | |
| 33 #include <QtWidgets/QGraphicsSceneMouseEvent> | |
| 34 #include <QtGui/QMouseEvent> | |
| 35 #include <QtCharts/QChart> | |
| 36 | |
| 37 Callout::Callout(QChart *chart, QAbstractSeries *series) : | |
| 38 QGraphicsItem(chart), m_chart(chart), m_series(series) | |
| 39 { | |
| 40 } | |
| 41 | |
| 42 | |
| 43 QRectF Callout::boundingRect() const | |
| 44 { | |
| 45 QPointF anchor = mapFromParent(m_chart->mapToPosition(m_anchor, m_series)); | |
| 46 QRectF rect; | |
| 47 rect.setLeft(qMin(m_rect.left(), anchor.x())); | |
| 48 rect.setRight(qMax(m_rect.right(), anchor.x())); | |
| 49 rect.setTop(qMin(m_rect.top(), anchor.y())); | |
| 50 rect.setBottom(qMax(m_rect.bottom(), anchor.y())); | |
| 51 return rect; | |
| 52 } | |
| 53 | |
| 54 | |
| 55 void Callout::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) | |
| 56 { | |
| 57 Q_UNUSED(option) | |
| 58 Q_UNUSED(widget) | |
| 59 QPainterPath path; | |
| 60 painter->setPen(Qt::black); | |
| 61 path.addRoundedRect(m_rect, 5, 5); | |
| 62 | |
| 63 QPointF anchor = mapFromParent(m_chart->mapToPosition(m_anchor, m_series)); | |
| 64 if (!m_rect.contains(anchor)) { | |
| 65 QPointF point1, point2; | |
| 66 | |
| 67 // establish the position of the anchor point in relation to m_rect | |
| 68 bool above = anchor.y() <= m_rect.top(); | |
| 69 bool aboveCenter = anchor.y() > m_rect.top() && anchor.y() <= m_rect.center().y(); | |
| 70 bool belowCenter = anchor.y() > m_rect.center().y() && anchor.y() <= m_rect.bottom(); | |
| 71 bool below = anchor.y() > m_rect.bottom(); | |
| 72 | |
| 73 bool onLeft = anchor.x() <= m_rect.left(); | |
| 74 bool leftOfCenter = anchor.x() > m_rect.left() && anchor.x() <= m_rect.center().x(); | |
| 75 bool rightOfCenter = anchor.x() > m_rect.center().x() && anchor.x() <= m_rect.right(); | |
| 76 bool onRight = anchor.x() > m_rect.right(); | |
| 77 | |
| 78 // get the nearest m_rect corner. | |
| 79 qreal x = (onRight + rightOfCenter) * m_rect.width(); | |
| 80 qreal y = (below + belowCenter) * m_rect.height(); | |
| 81 bool cornerCase = (above && onLeft) || (above && onRight) || (below && onLeft) || (below && onRight); | |
| 82 bool vertical = qAbs(anchor.x() - x) > qAbs(anchor.y() - y); | |
| 83 | |
| 84 qreal x1 = x + leftOfCenter * 10 - rightOfCenter * 20 + cornerCase * !vertical * (onLeft * 10 - onRight * 20); | |
| 85 qreal y1 = y + aboveCenter * 10 - belowCenter * 20 + cornerCase * vertical * (above * 10 - below * 20);; | |
| 86 point1.setX(x1); | |
| 87 point1.setY(y1); | |
| 88 | |
| 89 qreal x2 = x + leftOfCenter * 20 - rightOfCenter * 10 + cornerCase * !vertical * (onLeft * 20 - onRight * 10);; | |
| 90 qreal y2 = y + aboveCenter * 20 - belowCenter * 10 + cornerCase * vertical * (above * 20 - below * 10);; | |
| 91 point2.setX(x2); | |
| 92 point2.setY(y2); | |
| 93 | |
| 94 path.moveTo(point1); | |
| 95 path.lineTo(anchor); | |
| 96 path.lineTo(point2); | |
| 97 path = path.simplified(); | |
| 98 } | |
| 99 painter->setBrush(QColor(255, 255, 205)); | |
| 100 painter->drawPath(path); | |
| 101 painter->drawText(m_textRect, m_text); | |
| 102 } | |
| 103 | |
| 104 | |
| 105 void Callout::mousePressEvent(QGraphicsSceneMouseEvent *event) | |
| 106 { | |
| 107 event->setAccepted(true); | |
| 108 } | |
| 109 | |
| 110 | |
| 111 void Callout::mouseMoveEvent(QGraphicsSceneMouseEvent *event) | |
| 112 { | |
| 113 if (event->buttons() & Qt::LeftButton){ | |
| 114 setPos(mapToParent(event->pos() - event->buttonDownPos(Qt::LeftButton))); | |
| 115 event->setAccepted(true); | |
| 116 } else { | |
| 117 event->setAccepted(false); | |
| 118 } | |
| 119 } | |
| 120 | |
| 121 | |
| 122 void Callout::setSeries(QAbstractSeries *series) { m_series = series; } | |
| 123 | |
| 124 | |
| 125 void Callout::setText(const QString &text) | |
| 126 { | |
| 127 m_text = text; | |
| 128 QFontMetrics metrics(m_font); | |
| 129 m_textRect = metrics.boundingRect(QRect(0, 0, 150, 150), Qt::AlignLeft, m_text); | |
| 130 m_textRect.translate(5, 5); | |
| 131 prepareGeometryChange(); | |
| 132 m_rect = m_textRect.adjusted(-5, -5, 5, 5); | |
| 133 } | |
| 134 | |
| 135 | |
| 136 void Callout::setAnchor(QPointF point) | |
| 137 { | |
| 138 m_anchor = point; | |
| 139 } | |
| 140 | |
| 141 | |
| 142 void Callout::updateGeometry() | |
| 143 { | |
| 144 prepareGeometryChange(); | |
| 145 setPos(m_chart->mapToPosition(m_anchor, m_series) + QPoint(10, -50)); | |
| 146 } | |
| 147 |
