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

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