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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.io
**
** This file is part of the Qt Charts module.
**
** Licensees holding valid commercial license for Qt may use this file in
** accordance with the Qt License Agreement provided with the Software
** or, alternatively, in accordance with the terms contained in a written
** agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.io
**
****************************************************************************/
#include <private/verticalaxis_p.h>
#include <QtCharts/QAbstractAxis>
#include <private/chartpresenter_p.h>
#include <QtCore/QDebug>
QT_CHARTS_BEGIN_NAMESPACE
VerticalAxis::VerticalAxis(QAbstractAxis *axis, QGraphicsItem *item, bool intervalAxis)
: CartesianChartAxis(axis, item, intervalAxis)
{
}
VerticalAxis::~VerticalAxis()
{
}
void VerticalAxis::updateGeometry()
{
const QVector<qreal> &layout = ChartAxisElement::layout();
if (layout.isEmpty())
return;
QStringList labelList = labels();
QList<QGraphicsItem *> lines = gridItems();
QList<QGraphicsItem *> labels = labelItems();
QList<QGraphicsItem *> shades = shadeItems();
QList<QGraphicsItem *> arrow = arrowItems();
QGraphicsTextItem *title = titleItem();
Q_ASSERT(labels.size() == labelList.size());
Q_ASSERT(layout.size() == labelList.size());
const QRectF &axisRect = axisGeometry();
const QRectF &gridRect = gridGeometry();
qreal height = axisRect.bottom();
//arrow
QGraphicsLineItem *arrowItem = static_cast<QGraphicsLineItem*>(arrow.at(0));
//arrow position
if (axis()->alignment() == Qt::AlignLeft)
arrowItem->setLine(axisRect.right(), gridRect.top(), axisRect.right(), gridRect.bottom());
else if (axis()->alignment() == Qt::AlignRight)
arrowItem->setLine(axisRect.left(), gridRect.top(), axisRect.left(), gridRect.bottom());
//title
QRectF titleBoundingRect;
QString titleText = axis()->titleText();
qreal availableSpace = axisRect.width() - labelPadding();
if (!titleText.isEmpty() && titleItem()->isVisible()) {
availableSpace -= titlePadding() * 2.0;
qreal minimumLabelWidth = ChartPresenter::textBoundingRect(axis()->labelsFont(),
QStringLiteral("...")).width();
qreal titleSpace = availableSpace - minimumLabelWidth;
title->setHtml(ChartPresenter::truncatedText(axis()->titleFont(), titleText, qreal(90.0),
titleSpace, gridRect.height(),
titleBoundingRect));
title->setTextWidth(titleBoundingRect.height());
titleBoundingRect = title->boundingRect();
QPointF center = gridRect.center() - titleBoundingRect.center();
if (axis()->alignment() == Qt::AlignLeft)
title->setPos(axisRect.left() - titleBoundingRect.width() / 2.0 + titleBoundingRect.height() / 2.0 + titlePadding(), center.y());
else if (axis()->alignment() == Qt::AlignRight)
title->setPos(axisRect.right() - titleBoundingRect.width() / 2.0 - titleBoundingRect.height() / 2.0 - titlePadding(), center.y());
title->setTransformOriginPoint(titleBoundingRect.center());
title->setRotation(270);
availableSpace -= titleBoundingRect.height();
}
for (int i = 0; i < layout.size(); ++i) {
//items
QGraphicsLineItem *gridItem = static_cast<QGraphicsLineItem *>(lines.at(i));
QGraphicsLineItem *tickItem = static_cast<QGraphicsLineItem *>(arrow.at(i + 1));
QGraphicsTextItem *labelItem = static_cast<QGraphicsTextItem *>(labels.at(i));
//grid line
gridItem->setLine(gridRect.left(), layout[i], gridRect.right(), layout[i]);
//label text wrapping
QString text = labelList.at(i);
QRectF boundingRect;
// don't truncate empty labels
if (text.isEmpty()) {
labelItem->setHtml(text);
} else {
qreal labelHeight = (axisRect.height() / layout.count()) - (2 * labelPadding());
QString truncatedText = ChartPresenter::truncatedText(axis()->labelsFont(), text,
axis()->labelsAngle(),
availableSpace,
labelHeight, boundingRect);
labelItem->setTextWidth(ChartPresenter::textBoundingRect(axis()->labelsFont(),
truncatedText).width());
labelItem->setHtml(truncatedText);
}
//label transformation origin point
const QRectF &rect = labelItem->boundingRect();
QPointF center = rect.center();
labelItem->setTransformOriginPoint(center.x(), center.y());
qreal widthDiff = rect.width() - boundingRect.width();
qreal heightDiff = rect.height() - boundingRect.height();
//ticks and label position
if (axis()->alignment() == Qt::AlignLeft) {
labelItem->setPos(axisRect.right() - rect.width() + (widthDiff / 2.0) - labelPadding(), layout[i] - center.y());
tickItem->setLine(axisRect.right() - labelPadding(), layout[i], axisRect.right(), layout[i]);
} else if (axis()->alignment() == Qt::AlignRight) {
labelItem->setPos(axisRect.left() + labelPadding() - (widthDiff / 2.0), layout[i] - center.y());
tickItem->setLine(axisRect.left(), layout[i], axisRect.left() + labelPadding(), layout[i]);
}
//label in between
bool forceHide = false;
if (intervalAxis() && (i + 1) != layout.size()) {
qreal lowerBound = qMin(layout[i], gridRect.bottom());
qreal upperBound = qMax(layout[i + 1], gridRect.top());
const qreal delta = lowerBound - upperBound;
// Hide label in case visible part of the category at the grid edge is too narrow
if (delta < boundingRect.height()
&& (lowerBound == gridRect.bottom() || upperBound == gridRect.top())
&& !intervalAxis()) {
forceHide = true;
} else {
labelItem->setPos(labelItem->pos().x() , lowerBound - (delta / 2.0) - center.y());
}
}
//label overlap detection - compensate one pixel for rounding errors
if (labelItem->pos().y() + boundingRect.height() > height || forceHide ||
(labelItem->pos().y() + (heightDiff / 2.0) - 1.0) > axisRect.bottom() ||
labelItem->pos().y() + (heightDiff / 2.0) < (axisRect.top() - 1.0)) {
labelItem->setVisible(false);
}
else {
labelItem->setVisible(true);
height=labelItem->pos().y();
}
//shades
QGraphicsRectItem *shadeItem = 0;
if (i == 0)
shadeItem = static_cast<QGraphicsRectItem *>(shades.at(0));
else if (i % 2)
shadeItem = static_cast<QGraphicsRectItem *>(shades.at((i / 2) + 1));
if (shadeItem) {
qreal lowerBound;
qreal upperBound;
if (i == 0) {
lowerBound = gridRect.bottom();
upperBound = layout[0];
} else {
lowerBound = layout[i];
if (i == layout.size() - 1)
upperBound = gridRect.top();
else
upperBound = qMax(layout[i + 1], gridRect.top());
}
shadeItem->setRect(gridRect.left(), upperBound, gridRect.width(),
lowerBound - upperBound);
if (shadeItem->rect().height() <= 0.0)
shadeItem->setVisible(false);
else
shadeItem->setVisible(true);
}
// check if the grid line and the axis tick should be shown
qreal y = gridItem->line().p1().y();
if ((y < gridRect.top() || y > gridRect.bottom()))
{
gridItem->setVisible(false);
tickItem->setVisible(false);
}else{
gridItem->setVisible(true);
tickItem->setVisible(true);
}
}
//begin/end grid line in case labels between
if (intervalAxis()) {
QGraphicsLineItem *gridLine;
gridLine = static_cast<QGraphicsLineItem *>(lines.at(layout.size()));
gridLine->setLine(gridRect.left(), gridRect.top(), gridRect.right(), gridRect.top());
gridLine->setVisible(true);
gridLine = static_cast<QGraphicsLineItem*>(lines.at(layout.size() + 1));
gridLine->setLine(gridRect.left(), gridRect.bottom(), gridRect.right(), gridRect.bottom());
gridLine->setVisible(true);
}
}
QSizeF VerticalAxis::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
{
Q_UNUSED(constraint);
QSizeF sh(0, 0);
if (axis()->titleText().isEmpty() || !titleItem()->isVisible())
return sh;
switch (which) {
case Qt::MinimumSize: {
QRectF titleRect = ChartPresenter::textBoundingRect(axis()->titleFont(),
QStringLiteral("..."));
sh = QSizeF(titleRect.height() + (titlePadding() * 2.0), titleRect.width());
break;
}
case Qt::MaximumSize:
case Qt::PreferredSize: {
QRectF titleRect = ChartPresenter::textBoundingRect(axis()->titleFont(), axis()->titleText());
sh = QSizeF(titleRect.height() + (titlePadding() * 2.0), titleRect.width());
break;
}
default:
break;
}
return sh;
}
QT_CHARTS_END_NAMESPACE
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