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/chartlogvalueaxisy_p.h> |
11 | #include <private/chartpresenter_p.h> |
12 | |
13 | QT_BEGIN_NAMESPACE |
14 | |
15 | ChartLogValueAxisY::ChartLogValueAxisY(QLogValueAxis *axis, QGraphicsItem *item) |
16 | : VerticalAxis(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 | ChartLogValueAxisY::~ChartLogValueAxisY() |
24 | { |
25 | } |
26 | |
27 | QList<qreal> ChartLogValueAxisY::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 deltaY = gridRect.height() / qAbs(t: logMax - logMin); |
39 | for (int i = 0; i < m_axis->tickCount(); ++i) |
40 | points[i] = (ceilEdge + qreal(i)) * -deltaY - leftEdge * -deltaY + gridRect.bottom(); |
41 | |
42 | return points; |
43 | } |
44 | |
45 | |
46 | void ChartLogValueAxisY::updateGeometry() |
47 | { |
48 | const QList<qreal> &layout = ChartAxisElement::layout(); |
49 | setLabels(createLogValueLabels(min: m_axis->min(), max: m_axis->max(), base: m_axis->base(), ticks: layout.size(), format: m_axis->labelFormat())); |
50 | VerticalAxis::updateGeometry(); |
51 | } |
52 | |
53 | void ChartLogValueAxisY::handleBaseChanged(qreal base) |
54 | { |
55 | Q_UNUSED(base); |
56 | QGraphicsLayoutItem::updateGeometry(); |
57 | if(presenter()) presenter()->layout()->invalidate(); |
58 | } |
59 | |
60 | void ChartLogValueAxisY::handleLabelFormatChanged(const QString &format) |
61 | { |
62 | Q_UNUSED(format); |
63 | QGraphicsLayoutItem::updateGeometry(); |
64 | if(presenter()) presenter()->layout()->invalidate(); |
65 | } |
66 | |
67 | QSizeF ChartLogValueAxisY::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const |
68 | { |
69 | Q_UNUSED(constraint); |
70 | |
71 | const QSizeF base = VerticalAxis::sizeHint(which, constraint); |
72 | const int tickCount = m_axis->tickCount(); |
73 | QStringList ticksList; |
74 | QSizeF sh; |
75 | |
76 | if (m_axis->max() > m_axis->min() && tickCount > 0) |
77 | ticksList = createLogValueLabels(min: m_axis->min(), max: m_axis->max(), base: m_axis->base(), ticks: tickCount, format: m_axis->labelFormat()); |
78 | else |
79 | ticksList.append(QStringLiteral(" " )); |
80 | qreal width = 0; |
81 | // Height of vertical axis sizeHint indicates the maximum distance labels can extend past |
82 | // first and last ticks. Base height is irrelevant. |
83 | qreal height = 0; |
84 | |
85 | switch (which) { |
86 | case Qt::MinimumSize: { |
87 | if (labelsVisible()) { |
88 | QRectF boundingRect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(), |
89 | QStringLiteral("..." ), |
90 | angle: axis()->labelsAngle()); |
91 | width = boundingRect.width() + labelPadding() + base.width() + 1.0; |
92 | height = boundingRect.height() / 2.0; |
93 | } else { |
94 | width = base.width() + 1.0; |
95 | height = 0; |
96 | } |
97 | sh = QSizeF(width, height); |
98 | break; |
99 | } |
100 | case Qt::PreferredSize: { |
101 | if (labelsVisible()) { |
102 | qreal labelWidth = 0.0; |
103 | qreal firstHeight = -1.0; |
104 | foreach (const QString& s, ticksList) { |
105 | QRectF rect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(), text: s, angle: axis()->labelsAngle()); |
106 | labelWidth = qMax(a: rect.width(), b: labelWidth); |
107 | height = rect.height(); |
108 | if (firstHeight < 0.0) |
109 | firstHeight = height; |
110 | } |
111 | width = labelWidth + labelPadding() + base.width() + 2.0; //two pixels of tolerance |
112 | height = qMax(a: height, b: firstHeight) / 2.0; |
113 | } else { |
114 | width = base.width() + 2.0; |
115 | height = 0; |
116 | } |
117 | sh = QSizeF(width, height); |
118 | break; |
119 | } |
120 | default: |
121 | break; |
122 | } |
123 | |
124 | return sh; |
125 | } |
126 | |
127 | QT_END_NAMESPACE |
128 | |
129 | #include "moc_chartlogvalueaxisy_p.cpp" |
130 | |