1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "nesteddonutswidget.h"
#include <QChart>
#include <QChartView>
#include <QGraphicsLayout>
#include <QGridLayout>
#include <QLegend>
#include <QPieSeries>
#include <QPieSlice>
#include <QRandomGenerator>
#include <QTimer>
NestedDonutsWidget::NestedDonutsWidget(QWidget *parent)
: ContentWidget(parent)
{
//! [1]
auto chartView = new QChartView(this);
chartView->setRenderHint(QPainter::Antialiasing);
QChart *chart = chartView->chart();
chart->legend()->setVisible(false);
chart->setTitle("Nested Donuts (Hover over segments to explode them)");
chart->setAnimationOptions(QChart::AllAnimations);
chart->layout()->setContentsMargins(0, 0, 0, 0);
//! [1]
//! [2]
qreal minSize = 0.1;
qreal maxSize = 0.9;
int donutCount = 5;
//! [2]
//! [3]
for (int i = 0; i < donutCount; i++) {
auto donut = new QPieSeries;
int sliceCount = 3 + QRandomGenerator::global()->bounded(3);
for (int j = 0; j < sliceCount; j++) {
qreal value = 100 + QRandomGenerator::global()->bounded(100);
auto slice = new QPieSlice(QString("%1").arg(value), value);
slice->setLabelVisible(true);
slice->setLabelColor(Qt::white);
slice->setLabelPosition(QPieSlice::LabelInsideTangential);
connect(slice, &QPieSlice::hovered, this, &NestedDonutsWidget::explodeSlice);
donut->append(slice);
donut->setHoleSize(minSize + i * (maxSize - minSize) / donutCount);
donut->setPieSize(minSize + (i + 1) * (maxSize - minSize) / donutCount);
}
m_donuts.append(donut);
chartView->chart()->addSeries(donut);
}
//! [3]
// create main layout
//! [4]
auto mainLayout = new QGridLayout;
mainLayout->addWidget(chartView, 1, 1);
setLayout(mainLayout);
//! [4]
//! [5]
m_updateTimer = new QTimer(this);
connect(m_updateTimer, &QTimer::timeout, this, &NestedDonutsWidget::updateRotation);
m_updateTimer->start(1250);
//! [5]
}
//! [6]
void NestedDonutsWidget::updateRotation()
{
for (int i = 0; i < m_donuts.count(); i++) {
QPieSeries *donut = m_donuts.at(i);
qreal phaseShift = -50 + QRandomGenerator::global()->bounded(100);
donut->setPieStartAngle(donut->pieStartAngle() + phaseShift);
donut->setPieEndAngle(donut->pieEndAngle() + phaseShift);
}
}
//! [6]
//! [7]
void NestedDonutsWidget::explodeSlice(bool exploded)
{
auto slice = qobject_cast<QPieSlice *>(sender());
if (exploded) {
m_updateTimer->stop();
qreal sliceStartAngle = slice->startAngle();
qreal sliceEndAngle = slice->startAngle() + slice->angleSpan();
QPieSeries *donut = slice->series();
qreal seriesIndex = m_donuts.indexOf(donut);
for (int i = seriesIndex + 1; i < m_donuts.count(); i++) {
m_donuts.at(i)->setPieStartAngle(sliceEndAngle);
m_donuts.at(i)->setPieEndAngle(360 + sliceStartAngle);
}
} else {
for (int i = 0; i < m_donuts.count(); i++) {
m_donuts.at(i)->setPieStartAngle(0);
m_donuts.at(i)->setPieEndAngle(360);
}
m_updateTimer->start();
}
slice->setExploded(exploded);
}
//! [7]
|
