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29
30#include <private/chartcategoryaxisx_p.h>
31#include <QtCharts/QCategoryAxis>
32#include <QtCharts/QAbstractAxis>
33#include <private/chartpresenter_p.h>
34#include <private/abstractchartlayout_p.h>
35#include <QtWidgets/QGraphicsLayout>
36#include <QtCore/QtMath>
37
38QT_CHARTS_BEGIN_NAMESPACE
39
40ChartCategoryAxisX::ChartCategoryAxisX(QCategoryAxis *axis, QGraphicsItem* item)
41 : HorizontalAxis(axis, item, true),
42 m_axis(axis)
43{
44 QObject::connect(sender: axis, SIGNAL(categoriesChanged()), receiver: this, SLOT(handleCategoriesChanged()));
45}
46
47ChartCategoryAxisX::~ChartCategoryAxisX()
48{
49}
50
51QVector<qreal> ChartCategoryAxisX::calculateLayout() const
52{
53 int tickCount = m_axis->categoriesLabels().count() + 1;
54 QVector<qreal> points;
55
56 if (tickCount < 2)
57 return points;
58
59 const QRectF &gridRect = gridGeometry();
60 qreal range = max() - min();
61 if (range > 0) {
62 points.resize(size: tickCount);
63 qreal scale = gridRect.width() / range;
64 for (int i = 0; i < tickCount; ++i) {
65 if (i < tickCount - 1) {
66 qreal x = (m_axis->startValue(categoryLabel: m_axis->categoriesLabels().at(i)) - min()) * scale + gridRect.left();
67 points[i] = x;
68 } else {
69 qreal x = (m_axis->endValue(categoryLabel: m_axis->categoriesLabels().at(i: i - 1)) - min()) * scale + gridRect.left();
70 points[i] = x;
71 }
72 }
73 }
74
75 return points;
76}
77
78void ChartCategoryAxisX::updateGeometry()
79{
80 setLabels(m_axis->categoriesLabels() << QString());
81 HorizontalAxis::updateGeometry();
82}
83
84QSizeF ChartCategoryAxisX::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
85{
86 Q_UNUSED(constraint)
87
88 QSizeF sh;
89 QSizeF base = HorizontalAxis::sizeHint(which, constraint);
90 QStringList ticksList = m_axis->categoriesLabels();
91 qreal width = 0; // Width is irrelevant for X axes with interval labels
92 qreal height = 0;
93
94 switch (which) {
95 case Qt::MinimumSize: {
96 QRectF boundingRect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(),
97 QStringLiteral("..."),
98 angle: axis()->labelsAngle());
99 height = boundingRect.height() + labelPadding() + base.height() + 1.0;
100 sh = QSizeF(width, height);
101 break;
102 }
103 case Qt::PreferredSize: {
104 qreal labelHeight = 0.0;
105 foreach (const QString& s, ticksList) {
106 QRectF rect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(), text: s, angle: axis()->labelsAngle());
107 labelHeight = qMax(a: rect.height(), b: labelHeight);
108 }
109 height = labelHeight + labelPadding() + base.height() + 1.0;
110 sh = QSizeF(width, height);
111 break;
112 }
113 default:
114 break;
115 }
116
117 return sh;
118}
119
120void ChartCategoryAxisX::handleCategoriesChanged()
121{
122 QGraphicsLayoutItem::updateGeometry();
123 presenter()->layout()->invalidate();
124}
125
126QT_CHARTS_END_NAMESPACE
127
128#include "moc_chartcategoryaxisx_p.cpp"
129

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