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
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/**
* Copyright (C) 2001-2015 Klaralvdalens Datakonsult AB. All rights reserved.
*
* This file is part of the KD Chart library.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <QStandardItemModel>
#include <KChartChart>
#include <KChartLineDiagram>
#include <KChartHeaderFooter>
#include <KChartPosition>
#include <KChartBackgroundAttributes>
#include <KChartFrameAttributes>
#include <KChartGridAttributes>
#include <KChartAbstractCoordinatePlane>
#include <KChartCartesianCoordinatePlane>
#include <KChartAbstractCartesianDiagram>
#include <KChartDataValueAttributes>
#include <QApplication>
using namespace KChart;
class ChartWidget : public QWidget {
Q_OBJECT
public:
explicit ChartWidget(QWidget* parent = nullptr)
: QWidget(parent)
{
m_model.insertRows( 0, 6, QModelIndex() );
m_model.insertColumns( 0, 4, QModelIndex() );
for (int row = 0; row < 6; ++row) {
for (int column = 0; column < 4; ++column) {
QModelIndex index = m_model.index(row, column, QModelIndex());
m_model.setData(index, QVariant(row*0.5 + column) );
}
}
LineDiagram* diagram = new LineDiagram;
diagram->setModel(&m_model);
CartesianAxis *xAxis = new CartesianAxis( diagram );
CartesianAxis *yAxis = new CartesianAxis ( diagram );
xAxis->setPosition ( KChart::CartesianAxis::Bottom );
yAxis->setPosition ( KChart::CartesianAxis::Left );
diagram->addAxis( xAxis );
diagram->addAxis( yAxis );
m_chart.coordinatePlane()->replaceDiagram(diagram);
/* Header */
// Add at one Header and set it up
HeaderFooter* header = new HeaderFooter( &m_chart );
header->setPosition( Position::North );
header->setText( "A Line Chart with Grid Configured" );
m_chart.addHeaderFooter( header );
// Configure the Header text attributes
TextAttributes hta;
hta.setPen( QPen( Qt::red ) );
// let the header resize itself
// together with the widget.
// so-called relative size
Measure m( 35.0 );
m.setRelativeMode( header->autoReferenceArea(),
KChartEnums::MeasureOrientationMinimum );
hta.setFontSize( m );
// min font size
m.setValue( 3.0 );
m.setCalculationMode( KChartEnums::MeasureCalculationModeAbsolute );
hta.setMinimalFontSize( m );
header->setTextAttributes( hta );
// Configure the Header's Background
BackgroundAttributes hba;
hba.setBrush( Qt::white );
hba.setVisible( true );
header->setBackgroundAttributes( hba );
// Configure the header Frame attributes
FrameAttributes hfa;
hfa.setPen( QPen ( QBrush( Qt::darkGray ), 2 ) );
hfa.setPadding( 2 );
hfa.setVisible( true );
header->setFrameAttributes( hfa );
// diagram->coordinatePlane returns an abstract plane one.
// if we want to specify the orientation we need to cast
// as follow
CartesianCoordinatePlane* plane = static_cast <CartesianCoordinatePlane*>
( diagram->coordinatePlane() );
/* Configure grid steps and pen */
// Vertical
GridAttributes gv ( plane->gridAttributes( Qt::Vertical ) );
// Configure a grid pen
// I know it is horrible
// just for demo'ing
QPen gridPen( Qt::gray );
gridPen.setWidth( 2 );
gv.setGridPen( gridPen );
// Configure a sub-grid pen
QPen subGridPen( Qt::darkGray );
subGridPen.setStyle( Qt::DotLine );
gv.setSubGridPen( subGridPen );
// Display a blue zero line
gv.setZeroLinePen( QPen( Qt::blue ) );
// change step and substep width
// or any of those.
gv.setGridStepWidth( 1.0 );
gv.setGridSubStepWidth( 0.5 );
gv.setGridVisible( true );
gv.setSubGridVisible( true );
// Horizontal
GridAttributes gh = plane->gridAttributes( Qt::Horizontal );
gh.setGridPen( gridPen );
gh.setGridStepWidth( 0.5 );
gh.setSubGridPen( subGridPen );
gh.setGridSubStepWidth( 0.1 );
plane->setGridAttributes( Qt::Vertical, gv );
plane->setGridAttributes( Qt::Horizontal, gh );
// Data Values Display and position
const int colCount = diagram->model()->columnCount(diagram->rootIndex());
for ( int iColumn = 0; iColumn<colCount; ++iColumn ) {
DataValueAttributes a( diagram->dataValueAttributes( iColumn ) );
RelativePosition pos ( a.position( true ) );
pos.setAlignment( Qt::AlignRight );
a.setPositivePosition( pos );
QBrush brush( diagram->brush( iColumn ) );
TextAttributes ta( a.textAttributes() );
ta.setRotation( 0 );
ta.setFont( QFont( "Comic", 10 ) );
ta.setPen( QPen( brush.color() ) );
ta.setVisible( true );
a.setVisible( true );
a.setTextAttributes( ta );
diagram->setDataValueAttributes( iColumn, a );
}
QVBoxLayout* l = new QVBoxLayout(this);
l->addWidget(&m_chart);
m_chart.setGlobalLeadingRight( 20 );
setLayout(l);
}
private:
Chart m_chart;
QStandardItemModel m_model;
QPixmap pixmap;
};
int main( int argc, char** argv ) {
QApplication app( argc, argv );
ChartWidget w;
w.show();
return app.exec();
}
#include "main.moc"
|
