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 <QtCharts/qlogvalueaxis.h>
31#include <QtCore/qmath.h>
32#include <QtWidgets/qgraphicslayout.h>
33#include <private/abstractchartlayout_p.h>
34#include <private/chartlogvalueaxisy_p.h>
35#include <private/chartpresenter_p.h>
36
37QT_CHARTS_BEGIN_NAMESPACE
38
39ChartLogValueAxisY::ChartLogValueAxisY(QLogValueAxis *axis, QGraphicsItem *item)
40 : VerticalAxis(axis, item),
41 m_axis(axis)
42{
43 QObject::connect(sender: m_axis, SIGNAL(baseChanged(qreal)), receiver: this, SLOT(handleBaseChanged(qreal)));
44 QObject::connect(sender: m_axis, SIGNAL(labelFormatChanged(QString)), receiver: this, SLOT(handleLabelFormatChanged(QString)));
45}
46
47ChartLogValueAxisY::~ChartLogValueAxisY()
48{
49}
50
51QVector<qreal> ChartLogValueAxisY::calculateLayout() const
52{
53 QVector<qreal> points;
54 points.resize(size: m_axis->tickCount());
55
56 const qreal logMax = std::log10(x: m_axis->max()) / std::log10(x: m_axis->base());
57 const qreal logMin = std::log10(x: m_axis->min()) / std::log10(x: m_axis->base());
58 const qreal leftEdge = qMin(a: logMin, b: logMax);
59 const qreal ceilEdge = qCeil(v: leftEdge);
60
61 const QRectF &gridRect = gridGeometry();
62 const qreal deltaY = gridRect.height() / qAbs(t: logMax - logMin);
63 for (int i = 0; i < m_axis->tickCount(); ++i)
64 points[i] = (ceilEdge + qreal(i)) * -deltaY - leftEdge * -deltaY + gridRect.bottom();
65
66 return points;
67}
68
69
70void ChartLogValueAxisY::updateGeometry()
71{
72 const QVector<qreal> &layout = ChartAxisElement::layout();
73 setLabels(createLogValueLabels(min: m_axis->min(), max: m_axis->max(), base: m_axis->base(), ticks: layout.size(), format: m_axis->labelFormat()));
74 VerticalAxis::updateGeometry();
75}
76
77void ChartLogValueAxisY::handleBaseChanged(qreal base)
78{
79 Q_UNUSED(base);
80 QGraphicsLayoutItem::updateGeometry();
81 if(presenter()) presenter()->layout()->invalidate();
82}
83
84void ChartLogValueAxisY::handleLabelFormatChanged(const QString &format)
85{
86 Q_UNUSED(format);
87 QGraphicsLayoutItem::updateGeometry();
88 if(presenter()) presenter()->layout()->invalidate();
89}
90
91QSizeF ChartLogValueAxisY::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
92{
93 Q_UNUSED(constraint)
94
95 QSizeF sh;
96
97 QSizeF base = VerticalAxis::sizeHint(which, constraint);
98 QStringList ticksList;
99 qreal logMax = std::log10(x: m_axis->max()) / std::log10(x: m_axis->base());
100 qreal logMin = std::log10(x: m_axis->min()) / std::log10(x: m_axis->base());
101 int tickCount = qAbs(t: qCeil(v: logMax) - qCeil(v: logMin));
102
103 // If the high edge sits exactly on the tick value, add a tick
104 qreal highValue = logMin < logMax ? logMax : logMin;
105 if (qFuzzyCompare(p1: highValue, p2: qreal(qCeil(v: highValue))))
106 tickCount++;
107
108 if (m_axis->max() > m_axis->min() && tickCount > 0)
109 ticksList = createLogValueLabels(min: m_axis->min(), max: m_axis->max(), base: m_axis->base(), ticks: tickCount, format: m_axis->labelFormat());
110 else
111 ticksList.append(QStringLiteral(" "));
112 qreal width = 0;
113 // Height of vertical axis sizeHint indicates the maximum distance labels can extend past
114 // first and last ticks. Base height is irrelevant.
115 qreal height = 0;
116
117 switch (which) {
118 case Qt::MinimumSize: {
119 QRectF boundingRect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(),
120 QStringLiteral("..."),
121 angle: axis()->labelsAngle());
122 width = boundingRect.width() + labelPadding() + base.width() + 1.0;
123 height = boundingRect.height() / 2.0;
124 sh = QSizeF(width, height);
125 break;
126 }
127 case Qt::PreferredSize: {
128 qreal labelWidth = 0.0;
129 qreal firstHeight = -1.0;
130 foreach (const QString& s, ticksList) {
131 QRectF rect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(), text: s, angle: axis()->labelsAngle());
132 labelWidth = qMax(a: rect.width(), b: labelWidth);
133 height = rect.height();
134 if (firstHeight < 0.0)
135 firstHeight = height;
136 }
137 width = labelWidth + labelPadding() + base.width() + 2.0; //two pixels of tolerance
138 height = qMax(a: height, b: firstHeight) / 2.0;
139 sh = QSizeF(width, height);
140 break;
141 }
142 default:
143 break;
144 }
145
146 return sh;
147}
148
149QT_CHARTS_END_NAMESPACE
150
151#include "moc_chartlogvalueaxisy_p.cpp"
152

source code of qtcharts/src/charts/axis/logvalueaxis/chartlogvalueaxisy.cpp