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
|
/**
* 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 <math.h>
#include <QStandardItemModel>
#include <KChartChart>
#include <KChartLineDiagram>
#include <KChartDataValueAttributes>
#include <KChartFrameAttributes>
#include <KChartPlotter>
#include <KChartCartesianAxis>
#include <KChartCartesianCoordinatePlane>
#include <KChartLegend>
#include <QApplication>
using namespace KChart;
int main( int argc, char** argv )
{
QApplication app( argc, argv );
const int points = 420;
const double xMin = 0;
const double xMax = 20;
const double step = ( xMax - xMin ) / ( points - 1 );
QStandardItemModel model( points, 6 );
double x = xMin;
for ( int n = 0; n < points; ++n, x += step) {
QModelIndex index = model.index( n, 0 );
model.setData( index, x );
index = model.index( n, 1 );
model.setData( index, sin( x ) * 100.0 );
index = model.index( n, 2 );
model.setData( index, x );
index = model.index( n, 3 );
model.setData( index, x );
index = model.index( n, 4 );
model.setData( index, x );
index = model.index( n, 5 );
model.setData( index, x * x * x );
}
model.setHeaderData( 0, Qt::Horizontal, QString::fromLatin1( "100 * sin(x)" ) );
model.setHeaderData( 2, Qt::Horizontal, QString::fromLatin1( "x" ) );
model.setHeaderData( 4, Qt::Horizontal, QString::fromLatin1( "x^3" ) );
KChart::Chart* chart = new KChart::Chart();
KChart::AbstractCartesianDiagram* diagram = new KChart::Plotter;
diagram->setModel( &model );
chart->coordinatePlane()->replaceDiagram( diagram );
KChart::CartesianAxis* xAxis = new KChart::CartesianAxis( diagram );
KChart::CartesianAxis* yAxis = new KChart::CartesianAxis( diagram );
xAxis->setPosition( KChart::CartesianAxis::Bottom );
yAxis->setPosition( KChart::CartesianAxis::Left );
diagram->addAxis( xAxis );
diagram->addAxis( yAxis );
KChart::Legend* legend = new KChart::Legend( diagram, chart );
KChart::FrameAttributes legendAtt = legend->frameAttributes();
legendAtt.setCornerRadius( 9 );
legend->setFrameAttributes( legendAtt );
legend->setPosition( KChart::Position::East );
legend->setAlignment( Qt::AlignCenter );
legend->setTitleText( "Legend" );
chart->addLegend( legend );
KChart::CartesianCoordinatePlane* cart_plane = dynamic_cast<KChart::CartesianCoordinatePlane*>(chart->coordinatePlane());
Q_ASSERT(cart_plane);
cart_plane->setAxesCalcModeX(KChart::AbstractCoordinatePlane::Logarithmic);
cart_plane->setAxesCalcModeY(KChart::AbstractCoordinatePlane::Logarithmic);
// Set the vertical range from 15 to 75 - with a logarithmic axis I actually get 1 to 100
//cart_plane->setVerticalRange(QPair<qreal,qreal>( 0.005, 1000 ) );
// Set the horizontal range from 1 to 9 - with a linear axis this works OK
cart_plane->setHorizontalRange(QPair<qreal,qreal>( 0.001, 100 ) );
chart->show();
int ret = app.exec();
delete chart;
return ret;
}
|
