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1 | 1 | #include "callout.h" |
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2 | 2 | #include <QPainter> |
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3 | 3 | #include <QFontMetrics> |
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4 | 4 | #include <QGraphicsSceneMouseEvent> |
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5 | 5 | #include <QMouseEvent> |
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6 | 6 | |
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7 | 7 | Callout::Callout(QGraphicsItem * parent): |
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8 | 8 | QGraphicsItem(parent) |
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9 | 9 | { |
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10 | 10 | } |
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11 | 11 | |
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12 | 12 | QRectF Callout::boundingRect() const |
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13 | 13 | { |
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14 | 14 | QPointF anchor = mapFromParent(m_anchor); |
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15 | 15 | QRectF rect; |
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16 | 16 | rect.setLeft(qMin(m_rect.left(), anchor.x())); |
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17 | 17 | rect.setRight(qMax(m_rect.right(), anchor.x())); |
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18 | 18 | rect.setTop(qMin(m_rect.top(), anchor.y())); |
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19 | 19 | rect.setBottom(qMax(m_rect.bottom(), anchor.y())); |
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20 | 20 | return rect; |
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21 | 21 | } |
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22 | 22 | |
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23 | 23 | void Callout::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) |
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24 | 24 | { |
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25 | 25 | Q_UNUSED(option) |
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26 | 26 | Q_UNUSED(widget) |
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27 | 27 | QPainterPath path; |
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28 | 28 | path.addRoundedRect(m_rect, 5, 5); |
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29 | 29 | |
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30 | 30 | QPointF anchor = mapFromParent(m_anchor); |
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31 | 31 | if (!m_rect.contains(anchor)) { |
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32 | 32 | QPointF point1, point2; |
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33 | 33 | |
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34 |
// establish the position of the anchor point in relation to m_ |
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34 | // establish the position of the anchor point in relation to m_rect | |
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35 | 35 | bool above = anchor.y() <= m_rect.top(); |
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36 | 36 | bool aboveCenter = anchor.y() > m_rect.top() && anchor.y() <= m_rect.center().y(); |
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37 | 37 | bool belowCenter = anchor.y() > m_rect.center().y() && anchor.y() <= m_rect.bottom(); |
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38 | 38 | bool below = anchor.y() > m_rect.bottom(); |
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39 | 39 | |
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40 | 40 | bool onLeft = anchor.x() <= m_rect.left(); |
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41 | 41 | bool leftOfCenter = anchor.x() > m_rect.left() && anchor.x() <= m_rect.center().x(); |
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42 | 42 | bool rightOfCenter = anchor.x() > m_rect.center().x() && anchor.x() <= m_rect.right(); |
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43 | 43 | bool onRight = anchor.x() > m_rect.right(); |
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44 | 44 | |
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45 |
// get the nearest m_ |
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45 | // get the nearest m_rect corner. | |
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46 | 46 | qreal x = (onRight + rightOfCenter) * m_rect.width(); |
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47 | 47 | qreal y = (below + belowCenter) * m_rect.height(); |
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48 | 48 | bool cornerCase = (above && onLeft) || (above && onRight) || (below && onLeft) || (below && onRight); |
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49 | 49 | bool vertical = qAbs(anchor.x() - x) > qAbs(anchor.y() - y); |
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50 | 50 | |
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51 | 51 | qreal x1 = x + leftOfCenter * 10 - rightOfCenter * 20 + cornerCase * !vertical * (onLeft * 10 - onRight * 20); |
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52 | 52 | qreal y1 = y + aboveCenter * 10 - belowCenter * 20 + cornerCase * vertical * (above * 10 - below * 20);; |
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53 | 53 | point1.setX(x1); |
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54 | 54 | point1.setY(y1); |
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55 | 55 | |
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56 | 56 | qreal x2 = x + leftOfCenter * 20 - rightOfCenter * 10 + cornerCase * !vertical * (onLeft * 20 - onRight * 10);; |
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57 | 57 | qreal y2 = y + aboveCenter * 20 - belowCenter * 10 + cornerCase * vertical * (above * 20 - below * 10);; |
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58 | 58 | point2.setX(x2); |
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59 | 59 | point2.setY(y2); |
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60 | 60 | |
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61 | 61 | path.moveTo(point1); |
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62 | 62 | path.lineTo(mapFromParent(m_anchor)); |
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63 | 63 | path.lineTo(point2); |
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64 | 64 | path = path.simplified(); |
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65 | 65 | } |
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66 | 66 | painter->setBrush(QColor(255, 255, 255)); |
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67 | 67 | painter->drawPath(path); |
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68 | 68 | painter->drawText(m_textRect, m_text); |
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69 | 69 | } |
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70 | 70 | |
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71 | 71 | void Callout::mousePressEvent(QGraphicsSceneMouseEvent *event) |
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72 | 72 | { |
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73 | 73 | event->setAccepted(true); |
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74 | 74 | } |
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75 | 75 | |
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76 | 76 | void Callout::mouseMoveEvent(QGraphicsSceneMouseEvent *event) |
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77 | 77 | { |
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78 | 78 | if (event->buttons() & Qt::LeftButton){ |
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79 | 79 | setPos(mapToParent(event->pos() - event->buttonDownPos(Qt::LeftButton))); |
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80 | 80 | event->setAccepted(true); |
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81 | 81 | } else { |
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82 | 82 | event->setAccepted(false); |
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83 | 83 | } |
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84 | 84 | } |
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85 | 85 | |
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86 | 86 | void Callout::setText(const QString &text) |
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87 | 87 | { |
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88 | 88 | m_text = text; |
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89 | 89 | QFontMetrics metrics(m_font); |
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90 | 90 | m_textRect = metrics.boundingRect(QRect(0, 0, 150, 150), Qt::AlignLeft, m_text); |
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91 | 91 | m_textRect.translate(5, 5); |
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92 | 92 | prepareGeometryChange(); |
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93 | 93 | m_rect = m_textRect.adjusted(-5, -5, 5, 5); |
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94 | 94 | } |
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95 | 95 | |
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96 | 96 | void Callout::setAnchor(QPointF point) |
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97 | 97 | { |
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98 | 98 | m_anchor = point; |
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99 | 99 | } |
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1 | 1 | /*! |
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2 | 2 | \example demos/callout |
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3 | 3 | \title Callout demo |
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4 | 4 | \subtitle |
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5 | 5 | |
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6 | 6 | This demo shows how to draw an additional element (a callout) on top of the chart. |
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7 | 7 | \image demos_callout.png |
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8 | 8 | |
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9 |
QChart class provides two methods that map between the scene coordinates and the series' domain (define |
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9 | QChart class provides two methods that map between the scene coordinates and the series' domain (defined by the axes ranges). | |
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10 | ||
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10 | 11 | QPointF QChart::mapToPosition(const QPointF &value, QAbstractSeries *series) |
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12 | ||
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11 | 13 | QPointF QChart::mapToValue(const QPointF &position, QAbstractSeries *series) |
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12 | 14 | */ |
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