1// Copyright (C) 2016 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
3
4#include <private/chartcategoryaxisx_p.h>
5#include <QtCharts/QCategoryAxis>
6#include <QtCharts/QAbstractAxis>
7#include <private/chartpresenter_p.h>
8#include <private/abstractchartlayout_p.h>
9#include <QtWidgets/QGraphicsLayout>
10#include <QtCore/QtMath>
11
12QT_BEGIN_NAMESPACE
13
14ChartCategoryAxisX::ChartCategoryAxisX(QCategoryAxis *axis, QGraphicsItem* item)
15 : HorizontalAxis(axis, item, true),
16 m_axis(axis)
17{
18 QObject::connect(sender: axis, SIGNAL(categoriesChanged()), receiver: this, SLOT(handleCategoriesChanged()));
19}
20
21ChartCategoryAxisX::~ChartCategoryAxisX()
22{
23}
24
25QList<qreal> ChartCategoryAxisX::calculateLayout() const
26{
27 int tickCount = m_axis->categoriesLabels().size() + 1;
28 QList<qreal> points;
29
30 if (tickCount < 2)
31 return points;
32
33 const QRectF &gridRect = gridGeometry();
34 qreal range = max() - min();
35 if (range > 0) {
36 points.resize(size: tickCount);
37 qreal scale = gridRect.width() / range;
38 for (int i = 0; i < tickCount; ++i) {
39 if (i < tickCount - 1) {
40 qreal x = (m_axis->startValue(categoryLabel: m_axis->categoriesLabels().at(i)) - min()) * scale + gridRect.left();
41 points[i] = x;
42 } else {
43 qreal x = (m_axis->endValue(categoryLabel: m_axis->categoriesLabels().at(i: i - 1)) - min()) * scale + gridRect.left();
44 points[i] = x;
45 }
46 }
47 }
48
49 return points;
50}
51
52void ChartCategoryAxisX::updateGeometry()
53{
54 setLabels(m_axis->categoriesLabels() << QString());
55 HorizontalAxis::updateGeometry();
56}
57
58QSizeF ChartCategoryAxisX::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
59{
60 Q_UNUSED(constraint);
61
62 QSizeF sh;
63 QSizeF base = HorizontalAxis::sizeHint(which, constraint);
64 const QStringList ticksList = m_axis->categoriesLabels();
65 qreal width = 0; // Width is irrelevant for X axes with interval labels
66 qreal height = 0;
67
68 switch (which) {
69 case Qt::MinimumSize: {
70 if (labelsVisible()) {
71 QRectF boundingRect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(),
72 QStringLiteral("..."),
73 angle: axis()->labelsAngle());
74 height = boundingRect.height() + labelPadding() + base.height() + 1.0;
75 } else {
76 height = base.height() + 1.0;
77 }
78 sh = QSizeF(width, height);
79 break;
80 }
81 case Qt::PreferredSize: {
82 if (labelsVisible()) {
83 qreal labelHeight = 0.0;
84 for (const QString &s : ticksList) {
85 QRectF rect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(), text: s, angle: axis()->labelsAngle());
86 labelHeight = qMax(a: rect.height(), b: labelHeight);
87 }
88 height = labelHeight + labelPadding() + base.height() + 1.0;
89 } else {
90 height = base.height() + 1.0;
91 }
92 sh = QSizeF(width, height);
93 break;
94 }
95 default:
96 break;
97 }
98
99 return sh;
100}
101
102void ChartCategoryAxisX::handleCategoriesChanged()
103{
104 QGraphicsLayoutItem::updateGeometry();
105 presenter()->layout()->invalidate();
106}
107
108QT_END_NAMESPACE
109
110#include "moc_chartcategoryaxisx_p.cpp"
111

source code of qtcharts/src/charts/axis/categoryaxis/chartcategoryaxisx.cpp