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

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