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/****************************************************************************
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**
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** Copyright (C) 2014 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.io
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**
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** This file is part of the Qt Charts module.
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**
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** Licensees holding valid commercial license for Qt may use this file in
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** accordance with the Qt License Agreement provided with the Software
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** or, alternatively, in accordance with the terms contained in a written
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** agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.io
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**
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****************************************************************************/
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#include <private/horizontalaxis_p.h>
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#include <private/qabstractaxis_p.h>
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#include <private/chartpresenter_p.h>
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#include <QtCore/QtMath>
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#include <QtCore/QDebug>
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QT_CHARTS_BEGIN_NAMESPACE
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HorizontalAxis::HorizontalAxis(QAbstractAxis *axis, QGraphicsItem *item, bool intervalAxis)
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: CartesianChartAxis(axis, item, intervalAxis)
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{
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}
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HorizontalAxis::~HorizontalAxis()
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{
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}
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void HorizontalAxis::updateGeometry()
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{
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const QVector<qreal> &layout = ChartAxisElement::layout();
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if (layout.isEmpty() && axis()->type() != QAbstractAxis::AxisTypeLogValue)
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return;
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QStringList labelList = labels();
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QList<QGraphicsItem *> labels = labelItems();
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QList<QGraphicsItem *> arrow = arrowItems();
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QGraphicsTextItem *title = titleItem();
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Q_ASSERT(labels.size() == labelList.size());
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Q_ASSERT(layout.size() == labelList.size());
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const QRectF &axisRect = axisGeometry();
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const QRectF &gridRect = gridGeometry();
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//arrow
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QGraphicsLineItem *arrowItem = static_cast<QGraphicsLineItem *>(arrow.at(0));
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if (axis()->alignment() == Qt::AlignTop)
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arrowItem->setLine(gridRect.left(), axisRect.bottom(), gridRect.right(), axisRect.bottom());
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else if (axis()->alignment() == Qt::AlignBottom)
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arrowItem->setLine(gridRect.left(), axisRect.top(), gridRect.right(), axisRect.top());
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qreal width = 0;
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const QLatin1String ellipsis("...");
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//title
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QRectF titleBoundingRect;
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QString titleText = axis()->titleText();
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qreal availableSpace = axisRect.height() - labelPadding();
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if (!titleText.isEmpty() && titleItem()->isVisible()) {
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availableSpace -= titlePadding() * 2.0;
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qreal minimumLabelHeight = ChartPresenter::textBoundingRect(axis()->labelsFont(),
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QStringLiteral("...")).height();
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qreal titleSpace = availableSpace - minimumLabelHeight;
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title->setHtml(ChartPresenter::truncatedText(axis()->titleFont(), titleText, qreal(0.0),
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gridRect.width(), titleSpace,
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titleBoundingRect));
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title->setTextWidth(titleBoundingRect.width());
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titleBoundingRect = title->boundingRect();
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QPointF center = gridRect.center() - titleBoundingRect.center();
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if (axis()->alignment() == Qt::AlignTop)
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title->setPos(center.x(), axisRect.top() + titlePadding());
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else if (axis()->alignment() == Qt::AlignBottom)
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title->setPos(center.x(), axisRect.bottom() - titleBoundingRect.height() - titlePadding());
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availableSpace -= titleBoundingRect.height();
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}
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if (layout.isEmpty() && axis()->type() == QAbstractAxis::AxisTypeLogValue)
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return;
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QList<QGraphicsItem *> lines = gridItems();
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QList<QGraphicsItem *> shades = shadeItems();
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for (int i = 0; i < layout.size(); ++i) {
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//items
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QGraphicsLineItem *gridItem = static_cast<QGraphicsLineItem*>(lines.at(i));
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QGraphicsLineItem *tickItem = static_cast<QGraphicsLineItem*>(arrow.at(i + 1));
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QGraphicsTextItem *labelItem = static_cast<QGraphicsTextItem *>(labels.at(i));
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//grid line
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gridItem->setLine(layout[i], gridRect.top(), layout[i], gridRect.bottom());
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//label text wrapping
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QString text = labelList.at(i);
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QRectF boundingRect;
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// don't truncate empty labels
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if (text.isEmpty()) {
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labelItem->setHtml(text);
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} else {
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qreal labelWidth = axisRect.width() / layout.count() - (2 * labelPadding());
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QString truncatedText = ChartPresenter::truncatedText(axis()->labelsFont(), text,
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axis()->labelsAngle(),
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labelWidth,
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availableSpace, boundingRect);
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labelItem->setTextWidth(ChartPresenter::textBoundingRect(axis()->labelsFont(),
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truncatedText).width());
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labelItem->setHtml(truncatedText);
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}
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//label transformation origin point
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const QRectF& rect = labelItem->boundingRect();
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QPointF center = rect.center();
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labelItem->setTransformOriginPoint(center.x(), center.y());
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qreal heightDiff = rect.height() - boundingRect.height();
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qreal widthDiff = rect.width() - boundingRect.width();
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//ticks and label position
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if (axis()->alignment() == Qt::AlignTop) {
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labelItem->setPos(layout[i] - center.x(), axisRect.bottom() - rect.height() + (heightDiff / 2.0) - labelPadding());
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tickItem->setLine(layout[i], axisRect.bottom(), layout[i], axisRect.bottom() - labelPadding());
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} else if (axis()->alignment() == Qt::AlignBottom) {
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labelItem->setPos(layout[i] - center.x(), axisRect.top() - (heightDiff / 2.0) + labelPadding());
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tickItem->setLine(layout[i], axisRect.top(), layout[i], axisRect.top() + labelPadding());
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}
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//label in between
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bool forceHide = false;
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if (intervalAxis() && (i + 1) != layout.size()) {
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qreal leftBound = qMax(layout[i], gridRect.left());
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qreal rightBound = qMin(layout[i + 1], gridRect.right());
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const qreal delta = rightBound - leftBound;
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// Hide label in case visible part of the category at the grid edge is too narrow
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if (delta < boundingRect.width()
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&& (leftBound == gridRect.left() || rightBound == gridRect.right())
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&& !intervalAxis()) {
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forceHide = true;
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} else {
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labelItem->setPos(leftBound + (delta / 2.0) - center.x(), labelItem->pos().y());
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}
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}
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//label overlap detection - compensate one pixel for rounding errors
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if ((labelItem->pos().x() < width && labelItem->toPlainText() == ellipsis) || forceHide ||
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(labelItem->pos().x() + (widthDiff / 2.0)) < (axisRect.left() - 1.0) ||
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(labelItem->pos().x() + (widthDiff / 2.0) - 1.0) > axisRect.right()) {
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labelItem->setVisible(false);
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} else {
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labelItem->setVisible(true);
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width = boundingRect.width() + labelItem->pos().x();
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}
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//shades
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QGraphicsRectItem *shadeItem = 0;
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if (i == 0)
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shadeItem = static_cast<QGraphicsRectItem *>(shades.at(0));
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else if (i % 2)
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shadeItem = static_cast<QGraphicsRectItem *>(shades.at((i / 2) + 1));
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if (shadeItem) {
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qreal leftBound;
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qreal rightBound;
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if (i == 0) {
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leftBound = gridRect.left();
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rightBound = layout[0];
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} else {
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leftBound = layout[i];
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if (i == layout.size() - 1)
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rightBound = gridRect.right();
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else
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rightBound = qMin(layout[i + 1], gridRect.right());
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}
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shadeItem->setRect(leftBound, gridRect.top(), rightBound - leftBound,
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gridRect.height());
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if (shadeItem->rect().width() <= 0.0)
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shadeItem->setVisible(false);
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else
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shadeItem->setVisible(true);
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}
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// check if the grid line and the axis tick should be shown
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qreal x = gridItem->line().p1().x();
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if (x < gridRect.left() || x > gridRect.right()) {
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gridItem->setVisible(false);
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tickItem->setVisible(false);
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} else {
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gridItem->setVisible(true);
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tickItem->setVisible(true);
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}
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}
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//begin/end grid line in case labels between
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if (intervalAxis()) {
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QGraphicsLineItem *gridLine;
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gridLine = static_cast<QGraphicsLineItem *>(lines.at(layout.size()));
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gridLine->setLine(gridRect.right(), gridRect.top(), gridRect.right(), gridRect.bottom());
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gridLine->setVisible(true);
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gridLine = static_cast<QGraphicsLineItem*>(lines.at(layout.size()+1));
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gridLine->setLine(gridRect.left(), gridRect.top(), gridRect.left(), gridRect.bottom());
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gridLine->setVisible(true);
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}
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}
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QSizeF HorizontalAxis::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
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{
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Q_UNUSED(constraint);
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QSizeF sh(0,0);
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if (axis()->titleText().isEmpty() || !titleItem()->isVisible())
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return sh;
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switch (which) {
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case Qt::MinimumSize: {
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QRectF titleRect = ChartPresenter::textBoundingRect(axis()->titleFont(),
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QStringLiteral("..."));
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sh = QSizeF(titleRect.width(), titleRect.height() + (titlePadding() * 2.0));
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break;
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}
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case Qt::MaximumSize:
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case Qt::PreferredSize: {
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QRectF titleRect = ChartPresenter::textBoundingRect(axis()->titleFont(), axis()->titleText());
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sh = QSizeF(titleRect.width(), titleRect.height() + (titlePadding() * 2.0));
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break;
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}
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default:
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break;
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}
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return sh;
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}
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QT_CHARTS_END_NAMESPACE
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