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Nesteddonuts chart docs updated
Marek Rosa -
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1 1 /****************************************************************************
2 2 **
3 3 ** Copyright (C) 2012 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 #include "widget.h"
21 21 #include <QChartView>
22 22 #include <QChart>
23 23 #include <QLegend>
24 24 #include <QPieSeries>
25 25 #include <QPieSlice>
26 26 #include <QTime>
27 27 #include <QGridLayout>
28 28 #include <QTimer>
29 29
30 30 QTCOMMERCIALCHART_USE_NAMESPACE
31 31
32 32 Widget::Widget(QWidget *parent)
33 33 : QWidget(parent)
34 34 {
35 35 setMinimumSize(800, 600);
36 36 qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
37 37
38 38 //! [1]
39 39 QChartView *chartView = new QChartView;
40 40 chartView->setRenderHint(QPainter::Antialiasing);
41 QChart *chart = chartView->chart();
42 chart->setAnimationOptions(QChart::AllAnimations);
41 QChart *chart = chartView->chart();
43 42 chart->legend()->setVisible(false);
44 43 chart->setTitle("Nested donuts demo");
44 chart->setAnimationOptions(QChart::AllAnimations);
45 45 //! [1]
46 46
47 47 //! [2]
48 48 qreal minSize = 0.1;
49 49 qreal maxSize = 0.9;
50 50 int donutCount = 5;
51 51 //! [2]
52 52
53 53 //! [3]
54 54 for (int i = 0; i < donutCount; i++) {
55 55 QPieSeries *donut = new QPieSeries;
56 56 int sliceCount = 3 + qrand() % 3;
57 57 for (int j = 0; j < sliceCount; j++) {
58 58 qreal value = 100 + qrand() % 100;
59 59 QPieSlice *slice = new QPieSlice(QString("%1").arg(value), value);
60 60 slice->setLabelVisible(true);
61 61 slice->setLabelColor(Qt::white);
62 62 slice->setLabelPosition(QPieSlice::LabelInsideTangential);
63 63 connect(slice, SIGNAL(hovered(bool)), this, SLOT(explodeSlice(bool)));
64 64 donut->append(slice);
65 65 donut->setHoleSize(minSize + i * (maxSize - minSize) / donutCount);
66 66 donut->setPieSize(minSize + (i + 1) * (maxSize - minSize) / donutCount);
67 67 }
68 68 m_donuts.append(donut);
69 69 chartView->chart()->addSeries(donut);
70 70 }
71 71 //! [3]
72 72
73 73 // create main layout
74 74 //! [4]
75 75 QGridLayout* mainLayout = new QGridLayout;
76 76 mainLayout->addWidget(chartView, 1, 1);
77 77 setLayout(mainLayout);
78 78 //! [4]
79 79
80 80 //! [5]
81 81 updateTimer = new QTimer(this);
82 82 connect(updateTimer, SIGNAL(timeout()), this, SLOT(updateRotation()));
83 83 updateTimer->start(1250);
84 84 //! [5]
85 85 }
86 86
87 87 Widget::~Widget()
88 88 {
89 89
90 90 }
91 91
92 92 //! [6]
93 93 void Widget::updateRotation()
94 94 {
95 95 for (int i = 0; i < m_donuts.count(); i++) {
96 96 QPieSeries *donut = m_donuts.at(i);
97 97 qreal phaseShift = -50 + qrand() % 100;
98 98 donut->setPieStartAngle(donut->pieStartAngle() + phaseShift);
99 99 donut->setPieEndAngle(donut->pieEndAngle() + phaseShift);
100 100 }
101 101 }
102 102 //! [6]
103 103
104 104 //! [7]
105 105 void Widget::explodeSlice(bool exploded)
106 106 {
107 107 QPieSlice *slice = qobject_cast<QPieSlice *>(sender());
108 108 if (exploded) {
109 109 updateTimer->stop();
110 110 qreal sliceStartAngle = slice->startAngle();
111 111 qreal sliceEndAngle = slice->startAngle() + slice->angleSpan();
112 112
113 113 QPieSeries *donut = slice->series();
114 114 qreal seriesIndex = m_donuts.indexOf(donut);
115 115 for (int i = seriesIndex + 1; i < m_donuts.count(); i++) {
116 116 m_donuts.at(i)->setPieStartAngle(sliceEndAngle);
117 117 m_donuts.at(i)->setPieEndAngle(360 + sliceStartAngle);
118 118 }
119 119 } else {
120 120 for (int i = 0; i < m_donuts.count(); i++) {
121 121 m_donuts.at(i)->setPieStartAngle(0);
122 122 m_donuts.at(i)->setPieEndAngle(360);
123 123 }
124 124 updateTimer->start();
125 125 }
126 126 slice->setExploded(exploded);
127 127 }
128 128 //! [7]
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@@ -1,49 +1,50
1 1 /*!
2 2 \example demos/nesteddonuts
3 3 \title Nested donuts demo
4 4 \subtitle
5 5
6 6 This example shows how to use create a nested donuts chart using QPieSeries API.
7 7 \image demos_nesteddonuts.png
8 8
9 Let's start by creating a QChartView instance and enabling the Antialiasing on it. Last line enables the animations of the chart.
9 Let's start by creating a QChartView instance and enabling the Antialiasing on it. QChart object is then obtained from the QChartView instance.
10 The legend is disabled and the title of the chart is set. Last line enables the animations of the chart.
10 11
11 12 \snippet ../demos/nesteddonuts/widget.cpp 1
12 13
13 14 Three variables are defined that will be used to define the donut chart. Min and max size define the relative size of the whole donut.
14 15 minSize is the relative inner size of the smallest donut. maxSize is the relative outer size of the biggest donut.
15 16
16 17 \snippet ../demos/nesteddonuts/widget.cpp 2
17 18
18 19 Following block of code defines the individual donuts and their slices. First new QPieSeries object is created.
19 Callign setDonut() changes pie into a donut. The number of slices in each donut is randomized.
20 The number of slices in each donut is randomized.
20 21 The internal for loop creates the slices with a random value and label same as the value.
21 22 Next the label of the slice is set to be visible and its color is set to white.
22 23 To make the example more interesting the hovered signal of the slice is connected to widget's slot which inner workings are explained later.
23 24 Finally the slice is added to the donut. The donut's size is adjusted to achieve the nesting of the donuts.
24 25 Then the donut is added to the widget's list of donuts and to the chart.
25 26
26 27 \snippet ../demos/nesteddonuts/widget.cpp 3
27 28
28 29 Finally the widget is placed in a layout used by the application.
29 30
30 31 \snippet ../demos/nesteddonuts/widget.cpp 4
31 32
32 33 To make the example more interesting the donuts are rotated randomly every 1.25 sec.
33 34
34 35 \snippet ../demos/nesteddonuts/widget.cpp 5
35 36
36 37 The widget's updatedRotation slot is defined below.
37 38 It goes through all of the donuts and modifies thier current rotation by a random value.
38 39
39 40 \snippet ../demos/nesteddonuts/widget.cpp 6
40 41
41 42 The earlier mentioned explodeSlice slot code is provided below.
42 43 If the slice is set to exploded then stop the timer that controls the donuts rotation.
43 Then the slice's start and end agles are obtained from the slice.
44 Then the slice's start and end angles are obtained from the slice.
44 45 To highlight the selected slice all the other donuts that lie outward from the one that contains the selected slice
45 46 have their start and end angles modified so that they wouldn't "block" the way for the hightlighted slice.
46 47 If the slice is no longer selected return to the original state.
47 48
48 49 \snippet ../demos/nesteddonuts/widget.cpp 7
49 50 */
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