1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the Qt Charts module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:GPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU
19** General Public License version 3 or (at your option) any later version
20** approved by the KDE Free Qt Foundation. The licenses are as published by
21** the Free Software Foundation and appearing in the file LICENSE.GPL3
22** included in the packaging of this file. Please review the following
23** information to ensure the GNU General Public License requirements will
24** be met: https://www.gnu.org/licenses/gpl-3.0.html.
25**
26** $QT_END_LICENSE$
27**
28****************************************************************************/
29
30#include <private/logxydomain_p.h>
31#include <private/qabstractaxis_p.h>
32#include <QtCharts/QLogValueAxis>
33#include <QtCore/QtMath>
34#include <cmath>
35
36QT_CHARTS_BEGIN_NAMESPACE
37
38LogXYDomain::LogXYDomain(QObject *parent)
39 : AbstractDomain(parent),
40 m_logLeftX(0),
41 m_logRightX(1),
42 m_logBaseX(10)
43{
44}
45
46LogXYDomain::~LogXYDomain()
47{
48}
49
50void LogXYDomain::setRange(qreal minX, qreal maxX, qreal minY, qreal maxY)
51{
52 bool axisXChanged = false;
53 bool axisYChanged = false;
54
55 adjustLogDomainRanges(min&: minX, max&: maxX);
56
57 if (!qFuzzyCompare(p1: m_minX, p2: minX) || !qFuzzyCompare(p1: m_maxX, p2: maxX)) {
58 m_minX = minX;
59 m_maxX = maxX;
60 axisXChanged = true;
61 qreal logMinX = std::log10(x: m_minX) / std::log10(x: m_logBaseX);
62 qreal logMaxX = std::log10(x: m_maxX) / std::log10(x: m_logBaseX);
63 m_logLeftX = logMinX < logMaxX ? logMinX : logMaxX;
64 m_logRightX = logMinX > logMaxX ? logMinX : logMaxX;
65 if(!m_signalsBlocked)
66 emit rangeHorizontalChanged(min: m_minX, max: m_maxX);
67 }
68
69 if (!qFuzzyIsNull(d: m_minY - minY) || !qFuzzyIsNull(d: m_maxY - maxY)) {
70 m_minY = minY;
71 m_maxY = maxY;
72 axisYChanged = true;
73 if (!m_signalsBlocked)
74 emit rangeVerticalChanged(min: m_minY, max: m_maxY);
75 }
76
77 if (axisXChanged || axisYChanged)
78 emit updated();
79}
80
81void LogXYDomain::zoomIn(const QRectF &rect)
82{
83 storeZoomReset();
84 QRectF fixedRect = fixZoomRect(rect);
85 qreal logLeftX = fixedRect.left() * (m_logRightX - m_logLeftX) / m_size.width() + m_logLeftX;
86 qreal logRightX = fixedRect.right() * (m_logRightX - m_logLeftX) / m_size.width() + m_logLeftX;
87 qreal leftX = qPow(x: m_logBaseX, y: logLeftX);
88 qreal rightX = qPow(x: m_logBaseX, y: logRightX);
89 qreal minX = leftX < rightX ? leftX : rightX;
90 qreal maxX = leftX > rightX ? leftX : rightX;
91
92 qreal dy = spanY() / m_size.height();
93 qreal minY = m_minY;
94 qreal maxY = m_maxY;
95
96 minY = maxY - dy * fixedRect.bottom();
97 maxY = maxY - dy * fixedRect.top();
98
99 setRange(minX, maxX, minY, maxY);
100}
101
102void LogXYDomain::zoomOut(const QRectF &rect)
103{
104 storeZoomReset();
105 QRectF fixedRect = fixZoomRect(rect);
106 const qreal factorX = m_size.width() / fixedRect.width();
107
108 qreal logLeftX = m_logLeftX + (m_logRightX - m_logLeftX) / 2 * (1 - factorX);
109 qreal logRightX = m_logLeftX + (m_logRightX - m_logLeftX) / 2 * (1 + factorX);
110 qreal leftX = qPow(x: m_logBaseX, y: logLeftX);
111 qreal rightX = qPow(x: m_logBaseX, y: logRightX);
112 qreal minX = leftX < rightX ? leftX : rightX;
113 qreal maxX = leftX > rightX ? leftX : rightX;
114
115 qreal dy = spanY() / fixedRect.height();
116 qreal minY = m_minY;
117 qreal maxY = m_maxY;
118
119 maxY = minY + dy * fixedRect.bottom();
120 minY = maxY - dy * m_size.height();
121
122 if (logRightX > m_size.width())
123 return;
124
125 if (qIsInf(d: maxX))
126 return;
127
128 setRange(minX, maxX, minY, maxY);
129}
130
131void LogXYDomain::move(qreal dx, qreal dy)
132{
133 if (m_reverseX)
134 dx = -dx;
135 if (m_reverseY)
136 dy = -dy;
137
138 qreal stepX = dx * (m_logRightX - m_logLeftX) / m_size.width();
139 qreal leftX = qPow(x: m_logBaseX, y: m_logLeftX + stepX);
140 qreal rightX = qPow(x: m_logBaseX, y: m_logRightX + stepX);
141 qreal minX = leftX < rightX ? leftX : rightX;
142 qreal maxX = leftX > rightX ? leftX : rightX;
143
144 qreal y = spanY() / m_size.height();
145 qreal minY = m_minY;
146 qreal maxY = m_maxY;
147
148 if (dy != 0) {
149 minY = minY + y * dy;
150 maxY = maxY + y * dy;
151 }
152 setRange(minX, maxX, minY, maxY);
153}
154
155QPointF LogXYDomain::calculateGeometryPoint(const QPointF &point, bool &ok) const
156{
157 const qreal deltaX = m_size.width() / (m_logRightX - m_logLeftX);
158 const qreal deltaY = m_size.height() / (m_maxY - m_minY);
159
160 qreal x(0);
161 qreal y = (point.y() - m_minY) * deltaY;
162 if (!m_reverseY)
163 y = m_size.height() - y;
164 if (point.x() > 0) {
165 x = ((std::log10(x: point.x()) / std::log10(x: m_logBaseX)) - m_logLeftX) * deltaX;
166 if (m_reverseX)
167 x = m_size.width() - x;
168 ok = true;
169 } else {
170 x = 0;
171 qWarning() << "Logarithms of zero and negative values are undefined.";
172 ok = false;
173 }
174 return QPointF(x, y);
175}
176
177QVector<QPointF> LogXYDomain::calculateGeometryPoints(const QVector<QPointF> &vector) const
178{
179 const qreal deltaX = m_size.width() / (m_logRightX - m_logLeftX);
180 const qreal deltaY = m_size.height() / (m_maxY - m_minY);
181
182 QVector<QPointF> result;
183 result.resize(size: vector.count());
184
185 for (int i = 0; i < vector.count(); ++i) {
186 if (vector[i].x() > 0) {
187 qreal x = ((std::log10(x: vector[i].x()) / std::log10(x: m_logBaseX)) - m_logLeftX) * deltaX;
188 if (m_reverseX)
189 x = m_size.width() - x;
190 qreal y = (vector[i].y() - m_minY) * deltaY;
191 if (!m_reverseY)
192 y = m_size.height() - y;
193 result[i].setX(x);
194 result[i].setY(y);
195 } else {
196 qWarning() << "Logarithms of zero and negative values are undefined.";
197 return QVector<QPointF>();
198 }
199
200 }
201 return result;
202}
203
204QPointF LogXYDomain::calculateDomainPoint(const QPointF &point) const
205{
206 const qreal deltaX = m_size.width() / (m_logRightX - m_logLeftX);
207 const qreal deltaY = m_size.height() / (m_maxY - m_minY);
208 qreal x = m_reverseX ? (m_size.width() - point.x()) : point.x();
209 x = qPow(x: m_logBaseX, y: m_logLeftX + x / deltaX);
210 qreal y = m_reverseY ? point.y() : (m_size.height() - point.y());
211 y /= deltaY;
212 y += m_minY;
213 return QPointF(x, y);
214}
215
216bool LogXYDomain::attachAxis(QAbstractAxis *axis)
217{
218 AbstractDomain::attachAxis(axis);
219 QLogValueAxis *logAxis = qobject_cast<QLogValueAxis *>(object: axis);
220
221 if (logAxis && logAxis->orientation() == Qt::Horizontal) {
222 QObject::connect(sender: logAxis, SIGNAL(baseChanged(qreal)), receiver: this, SLOT(handleHorizontalAxisBaseChanged(qreal)));
223 handleHorizontalAxisBaseChanged(baseX: logAxis->base());
224 }
225
226 return true;
227}
228
229bool LogXYDomain::detachAxis(QAbstractAxis *axis)
230{
231 AbstractDomain::detachAxis(axis);
232 QLogValueAxis *logAxis = qobject_cast<QLogValueAxis *>(object: axis);
233
234 if (logAxis && logAxis->orientation() == Qt::Horizontal)
235 QObject::disconnect(sender: logAxis, SIGNAL(baseChanged(qreal)), receiver: this, SLOT(handleHorizontalAxisBaseChanged(qreal)));
236
237 return true;
238}
239
240void LogXYDomain::handleHorizontalAxisBaseChanged(qreal baseX)
241{
242 m_logBaseX = baseX;
243 qreal logMinX = std::log10(x: m_minX) / std::log10(x: m_logBaseX);
244 qreal logMaxX = std::log10(x: m_maxX) / std::log10(x: m_logBaseX);
245 m_logLeftX = logMinX < logMaxX ? logMinX : logMaxX;
246 m_logRightX = logMinX > logMaxX ? logMinX : logMaxX;
247 emit updated();
248}
249
250// operators
251
252bool Q_AUTOTEST_EXPORT operator== (const LogXYDomain &domain1, const LogXYDomain &domain2)
253{
254 return (qFuzzyIsNull(d: domain1.m_maxX - domain2.m_maxX)
255 && qFuzzyIsNull(d: domain1.m_maxY - domain2.m_maxY)
256 && qFuzzyIsNull(d: domain1.m_minX - domain2.m_minX)
257 && qFuzzyIsNull(d: domain1.m_minY - domain2.m_minY));
258}
259
260
261bool Q_AUTOTEST_EXPORT operator!= (const LogXYDomain &domain1, const LogXYDomain &domain2)
262{
263 return !(domain1 == domain2);
264}
265
266
267QDebug Q_AUTOTEST_EXPORT operator<<(QDebug dbg, const LogXYDomain &domain)
268{
269#ifdef QT_NO_TEXTSTREAM
270 Q_UNUSED(domain)
271#else
272 dbg.nospace() << "AbstractDomain(" << domain.m_minX << ',' << domain.m_maxX << ',' << domain.m_minY << ',' << domain.m_maxY << ')' << domain.m_size;
273#endif
274 return dbg.maybeSpace();
275}
276
277QT_CHARTS_END_NAMESPACE
278
279#include "moc_logxydomain_p.cpp"
280

source code of qtcharts/src/charts/domain/logxydomain.cpp