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Fixed pen style pattern continuity for line series...
Miikka Heikkinen -
r2457:4dae82608139
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1 1 /****************************************************************************
2 2 **
3 3 ** Copyright (C) 2013 Digia Plc
4 4 ** All rights reserved.
5 5 ** For any questions to Digia, please use contact form at http://qt.digia.com
6 6 **
7 7 ** This file is part of the Qt Commercial Charts Add-on.
8 8 **
9 9 ** $QT_BEGIN_LICENSE$
10 10 ** Licensees holding valid Qt Commercial licenses may use this file in
11 11 ** accordance with the Qt Commercial License Agreement provided with the
12 12 ** Software or, alternatively, in accordance with the terms contained in
13 13 ** a written agreement between you and Digia.
14 14 **
15 15 ** If you have questions regarding the use of this file, please use
16 16 ** contact form at http://qt.digia.com
17 17 ** $QT_END_LICENSE$
18 18 **
19 19 ****************************************************************************/
20 20
21 21 #include "linechartitem_p.h"
22 22 #include "qlineseries.h"
23 23 #include "qlineseries_p.h"
24 24 #include "chartpresenter_p.h"
25 25 #include "abstractdomain_p.h"
26 26 #include <QPainter>
27 27 #include <QGraphicsSceneMouseEvent>
28 28
29 29 QTCOMMERCIALCHART_BEGIN_NAMESPACE
30 30
31 31 const qreal mouseEventMinWidth(12);
32 32
33 33 LineChartItem::LineChartItem(QLineSeries *series,QGraphicsItem* item)
34 34 : XYChart(series,item),
35 35 m_series(series),
36 36 m_pointsVisible(false)
37 37 {
38 38 setAcceptHoverEvents(true);
39 39 setZValue(ChartPresenter::LineChartZValue);
40 40 QObject::connect(series->d_func(), SIGNAL(updated()), this, SLOT(handleUpdated()));
41 41 QObject::connect(series, SIGNAL(visibleChanged()), this, SLOT(handleUpdated()));
42 42 QObject::connect(series, SIGNAL(opacityChanged()), this, SLOT(handleUpdated()));
43 43 handleUpdated();
44 44 }
45 45
46 46 QRectF LineChartItem::boundingRect() const
47 47 {
48 48 return m_rect;
49 49 }
50 50
51 51 QPainterPath LineChartItem::shape() const
52 52 {
53 53 return m_path;
54 54 }
55 55
56 56 void LineChartItem::updateGeometry()
57 57 {
58 58 m_points = geometryPoints();
59 59
60 60 if (m_points.size() == 0) {
61 61 prepareGeometryChange();
62 62 m_path = QPainterPath();
63 63 m_linePath = QPainterPath();
64 64 m_rect = QRect();
65 65 return;
66 66 }
67 67
68 68 QPainterPath linePath(m_points.at(0));
69 69
70 70 if (m_pointsVisible) {
71 71
72 72 int size = m_linePen.width();
73 73 linePath.addEllipse(m_points.at(0), size, size);
74 74 linePath.moveTo(m_points.at(0));
75 75 for (int i = 1; i < m_points.size(); i++) {
76 76 linePath.lineTo(m_points.at(i));
77 77 linePath.addEllipse(m_points.at(i), size, size);
78 78 linePath.moveTo(m_points.at(i));
79 79 }
80 80
81 81 } else {
82 82 for (int i = 1; i < m_points.size(); i++)
83 83 linePath.lineTo(m_points.at(i));
84 84 }
85 85
86 86 m_linePath = linePath;
87 87
88 88 QPainterPathStroker stroker;
89 89 // QPainter::drawLine does not respect join styles, for example BevelJoin becomes MiterJoin.
90 90 // This is why we are prepared for the "worst case" scenario, i.e. use always MiterJoin and
91 91 // multiply line width with square root of two when defining shape and bounding rectangle.
92 92 stroker.setWidth(m_linePen.width() * 1.42);
93 93 stroker.setJoinStyle(Qt::MiterJoin);
94 94 stroker.setCapStyle(Qt::SquareCap);
95 95 stroker.setMiterLimit(m_linePen.miterLimit());
96 96
97 97 prepareGeometryChange();
98 98
99 99 m_path = stroker.createStroke(linePath);
100 100 m_rect = m_path.boundingRect();
101 101 }
102 102
103 103 void LineChartItem::handleUpdated()
104 104 {
105 105 // If points visiblity has changed, a geometry update is needed.
106 106 // Also, if pen changes when points are visible, geometry update is needed.
107 107 bool doGeometryUpdate =
108 108 (m_pointsVisible != m_series->pointsVisible())
109 109 || (m_series->pointsVisible() && (m_linePen != m_series->pen()));
110 110 setVisible(m_series->isVisible());
111 111 setOpacity(m_series->opacity());
112 112 m_pointsVisible = m_series->pointsVisible();
113 113 m_linePen = m_series->pen();
114 114 if (doGeometryUpdate)
115 115 updateGeometry();
116 116 update();
117 117 }
118 118
119 119 void LineChartItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
120 120 {
121 121 Q_UNUSED(widget)
122 122 Q_UNUSED(option)
123 123
124 124 painter->save();
125 125 painter->setPen(m_linePen);
126 painter->setBrush(m_linePen.color());
127 126 painter->setClipRect(QRectF(QPointF(0,0),domain()->size()));
128 127
129 128 if (m_pointsVisible) {
129 painter->setBrush(m_linePen.color());
130 130 painter->drawPath(m_linePath);
131 131 } else {
132 for (int i(1); i < m_points.size(); i++)
133 painter->drawLine(m_points.at(i - 1), m_points.at(i));
132 painter->setBrush(QBrush(Qt::NoBrush));
133 if (m_linePen.style() != Qt::SolidLine) {
134 // If pen style is not solid line, always fall back to path painting
135 // to ensure proper continuity of the pattern
136 painter->drawPath(m_linePath);
137 } else {
138 for (int i(1); i < m_points.size(); i++)
139 painter->drawLine(m_points.at(i - 1), m_points.at(i));
140 }
134 141 }
142
135 143 painter->restore();
136 144 }
137 145
138 146 void LineChartItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
139 147 {
140 148 emit XYChart::clicked(domain()->calculateDomainPoint(event->pos()));
141 149 QGraphicsItem::mousePressEvent(event);
142 150 }
143 151
144 152 void LineChartItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event)
145 153 {
146 154 emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), true);
147 155 // event->accept();
148 156 QGraphicsItem::hoverEnterEvent(event);
149 157 }
150 158
151 159 void LineChartItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
152 160 {
153 161 emit XYChart::hovered(domain()->calculateDomainPoint(event->pos()), false);
154 162 // event->accept();
155 163 QGraphicsItem::hoverEnterEvent(event);
156 164 }
157 165
158 166 #include "moc_linechartitem_p.cpp"
159 167
160 168 QTCOMMERCIALCHART_END_NAMESPACE
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