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
|
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\example percentbarchart
\title PercentBarChart Example
\ingroup qtcharts_examples
\brief The example shows how to create a simple percent bar chart.
A percent bar chart shows the data in sets as a percentage of
all sets per category.
Creating percent bar charts is just like creating a regular \l {BarChart Example} {bar chart}, except that for a
percent bar charts, we use the QPercentBarSeries api instead of QBarSeries. Also, in the
\l {BarChart Example} {bar chart} we used the nice numbers algorithm to make the y-axis numbering look better. With
the percent bar chart there is no need for that, because the maximum y-axis value is always 100.
\image examples_percentbarchart.png
\include examples-run.qdocinc
\section1 Creating Percent Bar Charts
The barsets are used in same way in all barcharts.
To illustrate the difference between various barcharts, we use the same data in all examples.
The data visualized by the bar chart is defined by QBarSet instances. Here we create the sets and append data
to them. The data is appended here with the << operator. Alternatively the append method could be used.
\snippet percentbarchart/main.cpp 1
We create the series and append the barsets to it. The series takes ownership of the barsets. The series groups the data from sets to categories.
The first values of each set are grouped together in the first category, the second values in the second category etc.
\snippet percentbarchart/main.cpp 2
Here we create the chart object and add the series to it. We set the title of the chart with setTitle, and then turn on animations of the series by calling
setAnimationOptions(QChart::SeriesAnimations)
\snippet percentbarchart/main.cpp 3
To have the categories displayed on an axis, we need to create a
QBarCategoryAxis first. Here we create a category axis with a list of
categories and add it to the chart aligned to the bottom, acting as the
x-axis. The chart takes ownership of the axis. For y-axis we use a value
axis, aligned to the left-hand side.
\snippet percentbarchart/main.cpp 4
We also want to show the legend. To do so, we get the legend pointer from the chart and set it to visible. We also place the legend to bottom of
the chart by setting its alignment to Qt::AlignBottom.
\snippet percentbarchart/main.cpp 5
Finally we add the chart onto a view. We also turn on the antialiasing for the chartView.
\snippet percentbarchart/main.cpp 6
The chart is ready to be shown. We set the chart to be central widget of the window.
We also set the size for the chart window and show it.
\snippet percentbarchart/main.cpp 7
*/
|
