1 | // Copyright (C) 2021 The Qt Company Ltd. |
2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only |
3 | |
4 | #undef QT_NO_FOREACH // this file contains unported legacy Q_FOREACH uses |
5 | |
6 | #include <QtCharts/qlogvalueaxis.h> |
7 | #include <QtCore/qmath.h> |
8 | #include <QtWidgets/qgraphicslayout.h> |
9 | #include <private/abstractchartlayout_p.h> |
10 | #include <private/chartlogvalueaxisx_p.h> |
11 | #include <private/chartpresenter_p.h> |
12 | |
13 | QT_BEGIN_NAMESPACE |
14 | |
15 | ChartLogValueAxisX::ChartLogValueAxisX(QLogValueAxis *axis, QGraphicsItem *item) |
16 | : HorizontalAxis(axis, item), |
17 | m_axis(axis) |
18 | { |
19 | QObject::connect(sender: m_axis, SIGNAL(baseChanged(qreal)), receiver: this, SLOT(handleBaseChanged(qreal))); |
20 | QObject::connect(sender: m_axis, SIGNAL(labelFormatChanged(QString)), receiver: this, SLOT(handleLabelFormatChanged(QString))); |
21 | } |
22 | |
23 | ChartLogValueAxisX::~ChartLogValueAxisX() |
24 | { |
25 | } |
26 | |
27 | QList<qreal> ChartLogValueAxisX::calculateLayout() const |
28 | { |
29 | QList<qreal> points; |
30 | points.resize(size: m_axis->tickCount()); |
31 | |
32 | const qreal logMax = qLn(v: m_axis->max()) / qLn(v: m_axis->base()); |
33 | const qreal logMin = qLn(v: m_axis->min()) / qLn(v: m_axis->base()); |
34 | const qreal leftEdge = qMin(a: logMin, b: logMax); |
35 | const qreal ceilEdge = std::ceil(x: leftEdge); |
36 | |
37 | const QRectF &gridRect = gridGeometry(); |
38 | const qreal deltaX = gridRect.width() / qAbs(t: logMax - logMin); |
39 | for (int i = 0; i < m_axis->tickCount(); ++i) |
40 | points[i] = (ceilEdge + qreal(i)) * deltaX - leftEdge * deltaX + gridRect.left(); |
41 | |
42 | return points; |
43 | } |
44 | |
45 | void ChartLogValueAxisX::updateGeometry() |
46 | { |
47 | const QList<qreal> &layout = ChartAxisElement::layout(); |
48 | setLabels(createLogValueLabels(min: m_axis->min(), max: m_axis->max(), base: m_axis->base(), ticks: layout.size(), format: m_axis->labelFormat())); |
49 | HorizontalAxis::updateGeometry(); |
50 | } |
51 | |
52 | void ChartLogValueAxisX::handleBaseChanged(qreal base) |
53 | { |
54 | Q_UNUSED(base); |
55 | QGraphicsLayoutItem::updateGeometry(); |
56 | if(presenter()) presenter()->layout()->invalidate(); |
57 | } |
58 | |
59 | void ChartLogValueAxisX::handleLabelFormatChanged(const QString &format) |
60 | { |
61 | Q_UNUSED(format); |
62 | QGraphicsLayoutItem::updateGeometry(); |
63 | if(presenter()) presenter()->layout()->invalidate(); |
64 | } |
65 | |
66 | QSizeF ChartLogValueAxisX::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const |
67 | { |
68 | Q_UNUSED(constraint); |
69 | |
70 | const QSizeF base = HorizontalAxis::sizeHint(which, constraint); |
71 | const int tickCount = m_axis->tickCount(); |
72 | QStringList ticksList; |
73 | QSizeF sh; |
74 | |
75 | if (m_axis->max() > m_axis->min() && tickCount > 0) |
76 | ticksList = createLogValueLabels(min: m_axis->min(), max: m_axis->max(), base: m_axis->base(), ticks: tickCount, format: m_axis->labelFormat()); |
77 | else |
78 | ticksList.append(QStringLiteral(" " )); |
79 | // Width of horizontal axis sizeHint indicates the maximum distance labels can extend past |
80 | // first and last ticks. Base width is irrelevant. |
81 | qreal width = 0; |
82 | qreal height = 0; |
83 | |
84 | switch (which) { |
85 | case Qt::MinimumSize:{ |
86 | if (labelsVisible()) { |
87 | QRectF boundingRect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(), |
88 | QStringLiteral("..." ), |
89 | angle: axis()->labelsAngle()); |
90 | width = boundingRect.width() / 2.0; |
91 | height = boundingRect.height() + labelPadding() + base.height() + 1.0; |
92 | } else { |
93 | width = 0; |
94 | height = base.height() + 1.0; |
95 | } |
96 | sh = QSizeF(width, height); |
97 | break; |
98 | } |
99 | case Qt::PreferredSize: { |
100 | if (labelsVisible()) { |
101 | qreal labelHeight = 0.0; |
102 | qreal firstWidth = -1.0; |
103 | foreach (const QString& s, ticksList) { |
104 | QRectF rect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(), text: s, angle: axis()->labelsAngle()); |
105 | labelHeight = qMax(a: rect.height(), b: labelHeight); |
106 | width = rect.width(); |
107 | if (firstWidth < 0.0) |
108 | firstWidth = width; |
109 | } |
110 | height = labelHeight + labelPadding() + base.height() + 1.0; |
111 | width = qMax(a: width, b: firstWidth) / 2.0; |
112 | } else { |
113 | height = base.height() + 1.0; |
114 | width = 0; |
115 | } |
116 | sh = QSizeF(width, height); |
117 | break; |
118 | } |
119 | default: |
120 | break; |
121 | } |
122 | |
123 | return sh; |
124 | } |
125 | |
126 | QT_END_NAMESPACE |
127 | |
128 | #include "moc_chartlogvalueaxisx_p.cpp" |
129 | |