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29
30#include <private/chartvalueaxisx_p.h>
31#include <QtCharts/QAbstractAxis>
32#include <private/chartpresenter_p.h>
33#include <QtCharts/QValueAxis>
34#include <private/abstractchartlayout_p.h>
35#include <private/valueaxislabel_p.h>
36#include <QtWidgets/QGraphicsLayout>
37#include <QtCore/QtMath>
38#include <QtCore/QDebug>
39
40
41QT_CHARTS_BEGIN_NAMESPACE
42
43ChartValueAxisX::ChartValueAxisX(QValueAxis *axis, QGraphicsItem *item )
44 : HorizontalAxis(axis, item),
45 m_axis(axis)
46{
47 QObject::connect(sender: m_axis, SIGNAL(tickCountChanged(int)), receiver: this, SLOT(handleTickCountChanged(int)));
48 QObject::connect(sender: m_axis, SIGNAL(minorTickCountChanged(int)),
49 receiver: this, SLOT(handleMinorTickCountChanged(int)));
50 QObject::connect(sender: m_axis, SIGNAL(labelFormatChanged(QString)), receiver: this, SLOT(handleLabelFormatChanged(QString)));
51 QObject::connect(sender: m_axis, SIGNAL(tickIntervalChanged(qreal)), receiver: this, SLOT(handleTickIntervalChanged(qreal)));
52 QObject::connect(sender: m_axis, SIGNAL(tickAnchorChanged(qreal)), receiver: this, SLOT(handleTickAnchorChanged(qreal)));
53 QObject::connect(sender: m_axis, SIGNAL(tickTypeChanged(QValueAxis::TickType)), receiver: this,
54 SLOT(handleTickTypeChanged(QValueAxis::TickType)));
55}
56
57ChartValueAxisX::~ChartValueAxisX()
58{
59}
60
61QVector<qreal> ChartValueAxisX::calculateLayout() const
62{
63 if (m_axis->tickType() == QValueAxis::TicksFixed) {
64 int tickCount = m_axis->tickCount();
65
66 Q_ASSERT(tickCount >= 2);
67
68 QVector<qreal> points;
69 points.resize(size: tickCount);
70
71 const QRectF &gridRect = gridGeometry();
72 const qreal deltaX = gridRect.width() / (qreal(tickCount) - 1.0);
73 for (int i = 0; i < tickCount; ++i)
74 points[i] = qreal(i) * deltaX + gridRect.left();
75 return points;
76 } else { // QValueAxis::TicksDynamic
77 const qreal interval = m_axis->tickInterval();
78 qreal value = m_axis->tickAnchor();
79 const qreal maxValue = max();
80 const qreal minValue = min();
81
82 // Find the first major tick right after the min of range
83 if (value > minValue)
84 value = value - int((value - minValue) / interval) * interval;
85 else
86 value = value + qCeil(v: (minValue - value) / interval) * interval;
87
88 const QRectF &gridRect = gridGeometry();
89 const qreal deltaX = gridRect.width() / (maxValue - minValue);
90
91 QVector<qreal> points;
92 const qreal leftPos = gridRect.left();
93 while (value <= maxValue || qFuzzyCompare(p1: value, p2: maxValue)) {
94 points << (value - minValue) * deltaX + leftPos;
95 value += interval;
96 }
97
98 return points;
99 }
100}
101
102void ChartValueAxisX::updateGeometry()
103{
104 const QVector<qreal>& layout = ChartAxisElement::layout();
105 const QVector<qreal>& dynamicMinorTicklayout = ChartAxisElement::dynamicMinorTicklayout();
106 if (layout.isEmpty() && dynamicMinorTicklayout.isEmpty())
107 return;
108 setLabels(createValueLabels(max: min(), min: max(), ticks: layout.size(), tickInterval: m_axis->tickInterval(),
109 tickAnchor: m_axis->tickAnchor(), tickType: m_axis->tickType(), format: m_axis->labelFormat()));
110 HorizontalAxis::updateGeometry();
111 updateLabelsValues(axis: m_axis);
112}
113
114void ChartValueAxisX::handleTickCountChanged(int tick)
115{
116 Q_UNUSED(tick);
117 QGraphicsLayoutItem::updateGeometry();
118 if (presenter()) presenter()->layout()->invalidate();
119}
120
121void ChartValueAxisX::handleMinorTickCountChanged(int tick)
122{
123 Q_UNUSED(tick);
124 QGraphicsLayoutItem::updateGeometry();
125 if (presenter())
126 presenter()->layout()->invalidate();
127}
128
129void ChartValueAxisX::handleLabelFormatChanged(const QString &format)
130{
131 Q_UNUSED(format);
132 QGraphicsLayoutItem::updateGeometry();
133 if (presenter()) presenter()->layout()->invalidate();
134}
135
136void ChartValueAxisX::handleTickIntervalChanged(qreal interval)
137{
138 Q_UNUSED(interval)
139 QGraphicsLayoutItem::updateGeometry();
140 if (presenter()) presenter()->layout()->invalidate();
141}
142
143void ChartValueAxisX::handleTickAnchorChanged(qreal anchor)
144{
145 Q_UNUSED(anchor)
146 QGraphicsLayoutItem::updateGeometry();
147 if (presenter()) presenter()->layout()->invalidate();
148}
149
150void ChartValueAxisX::handleTickTypeChanged(QValueAxis::TickType type)
151{
152 Q_UNUSED(type)
153 QGraphicsLayoutItem::updateGeometry();
154 if (presenter()) presenter()->layout()->invalidate();
155}
156
157QSizeF ChartValueAxisX::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
158{
159 Q_UNUSED(constraint)
160
161 QSizeF sh;
162
163 QSizeF base = HorizontalAxis::sizeHint(which, constraint);
164 QStringList ticksList = createValueLabels(max: min(), min: max(), ticks: m_axis->tickCount(),
165 tickInterval: m_axis->tickInterval(), tickAnchor: m_axis->tickAnchor(),
166 tickType: m_axis->tickType(), format: m_axis->labelFormat());
167 // Width of horizontal axis sizeHint indicates the maximum distance labels can extend past
168 // first and last ticks. Base width is irrelevant.
169 qreal width = 0;
170 qreal height = 0;
171
172 switch (which) {
173 case Qt::MinimumSize: {
174 QRectF boundingRect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(),
175 QStringLiteral("..."),
176 angle: axis()->labelsAngle());
177 width = boundingRect.width() / 2.0;
178 height = boundingRect.height() + labelPadding() + base.height() + 1.0;
179 sh = QSizeF(width, height);
180 break;
181 }
182 case Qt::PreferredSize: {
183 qreal labelHeight = 0.0;
184 qreal firstWidth = -1.0;
185 foreach (const QString& s, ticksList) {
186 QRectF rect = ChartPresenter::textBoundingRect(font: axis()->labelsFont(), text: s, angle: axis()->labelsAngle());
187 labelHeight = qMax(a: rect.height(), b: labelHeight);
188 width = rect.width();
189 if (firstWidth < 0.0)
190 firstWidth = width;
191 }
192 height = labelHeight + labelPadding() + base.height() + 1.0;
193 width = qMax(a: width, b: firstWidth) / 2.0;
194 sh = QSizeF(width, height);
195 break;
196 }
197 default:
198 break;
199 }
200 return sh;
201}
202
203QT_CHARTS_END_NAMESPACE
204
205#include "moc_chartvalueaxisx_p.cpp"
206

source code of qtcharts/src/charts/axis/valueaxis/chartvalueaxisx.cpp