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Piechart drafting
Jani Honkonen -
r9:de2fd29c3347
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1 #include <QtGui/QApplication>
2 #include <QtGui>
3 #include <QDebug>
4
5 class Slice : public QGraphicsItem
6 {
7 public:
8 Slice(const QColor& color, qreal startAngle, qreal span)
9 :m_color(color),
10 m_startAngle(startAngle),
11 m_span(span)
12 {
13 setAcceptHoverEvents(true);
14 }
15
16 ~Slice()
17 {
18
19 }
20
21 virtual QRectF boundingRect() const
22 {
23 return parentItem()->boundingRect();
24 }
25
26 QPainterPath shape() const
27 {
28 qreal angle = (-m_startAngle) + (90);
29 qreal span = -m_span;
30
31 QPainterPath path;
32 path.moveTo(boundingRect().center());
33 path.arcTo(boundingRect(), angle, span);
34
35 // TODO: draw the shape so that it might have a hole in the center
36 // - Sin & Cos will be needed to find inner/outer arc endpoints
37
38 // dx, dy are offsets from the center
39 //qreal l = boundingRect().height();
40 //qreal dx = qSin(angle*(M_PI/180)) * l;
41 //qreal dy = qCos(angle*(M_PI/180)) * l;
42
43 // TODO: exploded slice?
44
45 return path;
46 }
47
48 virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
49 {
50 // Setup painter
51 painter->setBrush(m_color);
52 QPen pen;
53 //pen.setColor(m_color.darker());
54 pen.setColor(Qt::gray);
55 pen.setWidth(1);
56 painter->setPen(pen);
57
58 // From Qt docs:
59 // The startAngle and spanAngle must be specified in 1/16th of a degree, i.e. a full circle equals 5760 (16 * 360).
60 // Positive values for the angles mean counter-clockwise while negative values mean the clockwise direction.
61 // Zero degrees is at the 3 o'clock position.
62 //
63 // For sake of simplicity convert this so that zero degrees is at 12 o'clock and full circle is 360.
64 //qreal angle = (-m_startAngle*16) + (90*16);
65 //qreal span = -m_span*16;
66 //painter->drawPie(boundingRect(), angle, span);
67
68 painter->drawPath(shape());
69 }
70
71 virtual void hoverEnterEvent( QGraphicsSceneHoverEvent * event)
72 {
73 QGraphicsItem::hoverEnterEvent(event);
74 qDebug() << "hover" << m_color << m_startAngle << m_span;
75 }
76
77 private:
78 QColor m_color;
79 qreal m_startAngle;
80 qreal m_span;
81 };
82
83 class PieChart : public QGraphicsItem
84 {
85 public:
86 PieChart()
87 {
88 qsrand(QTime::currentTime().msec());
89 }
90
91 ~PieChart()
92 {
93
94 }
95
96 QColor randomColor()
97 {
98 QColor c;
99 c.setRed(qrand() % 255);
100 c.setGreen(qrand() % 255);
101 c.setBlue(qrand() % 255);
102 return c;
103 }
104
105 void setData(QList<int> data)
106 {
107 qreal fullPie = 360;
108
109 qreal total = 0;
110 foreach (qreal value, data)
111 total += value;
112
113 qreal angle = 0;
114 foreach (qreal value, data) {
115 qreal span = value / total * fullPie;
116 Slice *slice = new Slice(randomColor(), angle, span);
117 slice->setParentItem(this);
118 m_slices.append(slice);
119 angle += span;
120 }
121 }
122
123 virtual QRectF boundingRect() const
124 {
125 return QRectF(-200, -200, 200, 200);
126 }
127
128 virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
129 {
130 //painter->setBrush(Qt::red);
131 //painter->drawRect(boundingRect());
132 }
133
134 private:
135 QList<Slice*> m_slices;
136 QSizeF m_size;
137 };
138
139
140 int main(int argc, char *argv[])
141 {
142 QApplication a(argc, argv);
143
144 QGraphicsScene scene;
145
146 PieChart *pieChart = new PieChart();
147 scene.addItem(pieChart);
148
149 QGraphicsView view(&scene);
150 view.setRenderHint(QPainter::Antialiasing);
151 view.resize(400, 300);
152 view.show();
153
154 QList<int> data;
155 data << 1;
156 data << 2;
157 data << 3;
158 data << 20;
159 data << 2;
160 data << 3;
161 data << 10;
162 data << 2;
163 data << 1;
164 data << 5;
165 pieChart->setData(data);
166
167 return a.exec();
168 }
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@@ -0,0 +1,15
1 #-------------------------------------------------
2 #
3 # Project created by QtCreator 2012-01-11T14:41:14
4 #
5 #-------------------------------------------------
6
7 QT += core gui
8
9 TARGET = pie
10 TEMPLATE = app
11
12
13 SOURCES += main.cpp
14
15 HEADERS +=
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