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29
30#include <private/chartbarcategoryaxisx_p.h>
31#include <private/chartpresenter_p.h>
32#include <private/qbarcategoryaxis_p.h>
33#include <private/abstractchartlayout_p.h>
34#include <QtCore/QDebug>
35#include <QtCore/QtMath>
36
37QT_CHARTS_BEGIN_NAMESPACE
38
39ChartBarCategoryAxisX::ChartBarCategoryAxisX(QBarCategoryAxis *axis, QGraphicsItem* item)
40 : HorizontalAxis(axis, item, true),
41 m_categoriesAxis(axis)
42{
43 QObject::connect(sender: m_categoriesAxis,SIGNAL(categoriesChanged()),receiver: this, SLOT(handleCategoriesChanged()));
44 handleCategoriesChanged();
45}
46
47ChartBarCategoryAxisX::~ChartBarCategoryAxisX()
48{
49}
50
51QVector<qreal> ChartBarCategoryAxisX::calculateLayout() const
52{
53 QVector<qreal> points;
54 const QRectF& gridRect = gridGeometry();
55 qreal range = max() - min();
56 const qreal delta = gridRect.width() / range;
57
58 if (delta < 2)
59 return points;
60
61 qreal adjustedMin = min() + 0.5;
62 qreal offset = (qRound(d: adjustedMin) - adjustedMin) * delta;
63
64 int count = qFloor(v: range);
65 if (count < 1)
66 return points;
67
68 points.resize(size: count + 2);
69
70 for (int i = 0; i < count + 2; ++i)
71 points[i] = offset + (qreal(i) * delta) + gridRect.left();
72
73 return points;
74}
75
76QStringList ChartBarCategoryAxisX::createCategoryLabels(const QVector<qreal>& layout) const
77{
78 QStringList result ;
79 const QRectF &gridRect = gridGeometry();
80 qreal d = (max() - min()) / gridRect.width();
81
82 for (int i = 0; i < layout.count() - 1; ++i) {
83 int x = qFloor(v: (((layout[i] + layout[i + 1]) / 2 - gridRect.left()) * d + min() + 0.5));
84 if (x < max() && (x >= 0) && x < m_categoriesAxis->categories().count()) {
85 result << m_categoriesAxis->categories().at(i: x);
86 } else {
87 // No label for x coordinate
88 result << QString();
89 }
90 }
91 result << QString();
92 return result;
93}
94
95
96void ChartBarCategoryAxisX::updateGeometry()
97{
98 const QVector<qreal>& layout = ChartAxisElement::layout();
99 if (layout.isEmpty())
100 return;
101 setLabels(createCategoryLabels(layout));
102 HorizontalAxis::updateGeometry();
103}
104
105void ChartBarCategoryAxisX::handleCategoriesChanged()
106{
107 QGraphicsLayoutItem::updateGeometry();
108 if(presenter()) presenter()->layout()->invalidate();
109}
110
111QSizeF ChartBarCategoryAxisX::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
112{
113 Q_UNUSED(constraint)
114
115 QSizeF sh;
116 QSizeF base = HorizontalAxis::sizeHint(which, constraint);
117 QStringList ticksList = m_categoriesAxis->categories();
118
119 qreal width = 0; // Width is irrelevant for X axes with interval labels
120 qreal height = 0;
121
122 switch (which) {
123 case Qt::MinimumSize: {
124 QRectF boundingRect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(),
125 QStringLiteral("..."),
126 angle: axis()->labelsAngle());
127 height = boundingRect.height() + labelPadding() + base.height() + 1.0;
128 sh = QSizeF(width, height);
129 break;
130 }
131 case Qt::PreferredSize:{
132 qreal labelHeight = 0.0;
133 foreach (const QString& s, ticksList) {
134 QRectF rect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(), text: s, angle: axis()->labelsAngle());
135 labelHeight = qMax(a: rect.height(), b: labelHeight);
136 }
137 height = labelHeight + labelPadding() + base.height() + 1.0;
138 sh = QSizeF(width, height);
139 break;
140 }
141 default:
142 break;
143 }
144 return sh;
145}
146
147QT_CHARTS_END_NAMESPACE
148
149#include "moc_chartbarcategoryaxisx_p.cpp"
150

source code of qtcharts/src/charts/axis/barcategoryaxis/chartbarcategoryaxisx.cpp