KD Chart API Documentation 3.0
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TernaryPoint.cpp
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1/****************************************************************************
2**
3** This file is part of the KD Chart library.
4**
5** SPDX-FileCopyrightText: 2001 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
6**
7** SPDX-License-Identifier: MIT
8**
9****************************************************************************/
10
11#include "TernaryPoint.h"
12#include "TernaryConstants.h"
13
14#include <limits>
15
16#include <QChar>
17#include <QTextStream>
18
20{
21 Q_ASSERT(!isValid());
22}
23
25{
26 set(a, b);
27}
28
29void TernaryPoint::set(qreal a, qreal b)
30{
31 if (a >= 0.0 && a <= 1.0
32 && b >= 0.0 && b <= 1.0
33 && 1.0 - a - b >= -2.0 * std::numeric_limits<qreal>::epsilon()) {
34 m_a = a;
35 m_b = b;
36 Q_ASSERT(isValid()); // more a test for isValid
37 } else {
38 m_a = -1.0;
39 m_b = -1.0;
40 Q_ASSERT(!isValid());
41 }
42}
43
45{
46 return m_a >= 0.0 && m_a <= 1.0
47 && m_b >= 0.0 && m_b <= 1.0
48 && 1.0 - m_a + m_b >= -std::numeric_limits<qreal>::epsilon();
49}
50
51QDebug operator<<(QDebug stream, const TernaryPoint &point)
52{
53 QString string;
54 QTextStream text(&string);
55 text << "[TernaryPoint: ";
56 if (point.isValid()) {
57 text.setFieldWidth(2);
58 text.setPadChar(QLatin1Char('0'));
59 text << ( int )(point.a() * 100.0) << "%|"
60 << ( int )(point.b() * 100.0) << "%|"
61 << ( int )(point.c() * 100.0) << "%]";
62 } else {
63 text << "a=" << point.a() << " - b=" << point.b() << " - INVALID]";
64 }
65 stream << string;
66 return stream;
67}
68
70{
71 if (point.isValid()) {
72 // the position is calculated by
73 // - first moving along the B-C line to the function that b
74 // selects
75 // - then traversing the selected function until we meet with
76 // the function that A selects (which is a parallel of the B-C
77 // line)
78 QPointF bPosition(1.0 - point.b(), 0.0);
79 QPointF aPosition(point.a() * AxisVector_C_A);
80 QPointF result(bPosition + aPosition);
81 return result;
82 } else {
83 qWarning() << "TernaryPoint::translate(TernaryPoint): cannot translate invalid ternary points:"
84 << point;
85 return QPointF();
86 }
87}
const QPointF AxisVector_C_A
QDebug operator<<(QDebug stream, const TernaryPoint &point)
QPointF translate(const TernaryPoint &point)
TernaryPoint defines a point within a ternary coordinate plane.
void set(qreal a, qreal b)
qreal a() const
qreal b() const
bool isValid() const
qreal c() const
void setFieldWidth(int width)
void setPadChar(QChar ch)

© 2001 Klarälvdalens Datakonsult AB (KDAB)
"The Qt, C++ and OpenGL Experts"
https://www.kdab.com/
https://www.kdab.com/development-resources/qt-tools/kd-chart/
Generated on Fri Feb 23 2024 00:02:59 for KD Chart API Documentation by doxygen 1.9.8