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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/verticalaxis_p.h>
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#include <QtCharts/QAbstractAxis>
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#include <private/chartpresenter_p.h>
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#include <QtCore/QDebug>
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QT_CHARTS_BEGIN_NAMESPACE
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VerticalAxis::VerticalAxis(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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VerticalAxis::~VerticalAxis()
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{
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}
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void VerticalAxis::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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qreal height = axisRect.bottom();
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//arrow
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QGraphicsLineItem *arrowItem = static_cast<QGraphicsLineItem*>(arrow.at(0));
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//arrow position
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if (axis()->alignment() == Qt::AlignLeft)
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arrowItem->setLine(axisRect.right(), gridRect.top(), axisRect.right(), gridRect.bottom());
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else if (axis()->alignment() == Qt::AlignRight)
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arrowItem->setLine(axisRect.left(), gridRect.top(), axisRect.left(), gridRect.bottom());
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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.width() - labelPadding();
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if (!titleText.isEmpty() && titleItem()->isVisible()) {
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availableSpace -= titlePadding() * 2.0;
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qreal minimumLabelWidth = ChartPresenter::textBoundingRect(axis()->labelsFont(),
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QStringLiteral("...")).width();
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qreal titleSpace = availableSpace - minimumLabelWidth;
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title->setHtml(ChartPresenter::truncatedText(axis()->titleFont(), titleText, qreal(90.0),
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titleSpace, gridRect.height(),
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titleBoundingRect));
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title->setTextWidth(titleBoundingRect.height());
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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::AlignLeft)
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title->setPos(axisRect.left() - titleBoundingRect.width() / 2.0 + titleBoundingRect.height() / 2.0 + titlePadding(), center.y());
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else if (axis()->alignment() == Qt::AlignRight)
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title->setPos(axisRect.right() - titleBoundingRect.width() / 2.0 - titleBoundingRect.height() / 2.0 - titlePadding(), center.y());
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title->setTransformOriginPoint(titleBoundingRect.center());
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title->setRotation(270);
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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(gridRect.left(), layout[i], gridRect.right(), layout[i]);
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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 labelHeight = (axisRect.height() / 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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availableSpace,
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labelHeight, 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 widthDiff = rect.width() - boundingRect.width();
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qreal heightDiff = rect.height() - boundingRect.height();
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//ticks and label position
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if (axis()->alignment() == Qt::AlignLeft) {
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labelItem->setPos(axisRect.right() - rect.width() + (widthDiff / 2.0) - labelPadding(), layout[i] - center.y());
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tickItem->setLine(axisRect.right() - labelPadding(), layout[i], axisRect.right(), layout[i]);
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} else if (axis()->alignment() == Qt::AlignRight) {
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labelItem->setPos(axisRect.left() + labelPadding() - (widthDiff / 2.0), layout[i] - center.y());
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tickItem->setLine(axisRect.left(), layout[i], axisRect.left() + labelPadding(), layout[i]);
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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 lowerBound = qMin(layout[i], gridRect.bottom());
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qreal upperBound = qMax(layout[i + 1], gridRect.top());
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const qreal delta = lowerBound - upperBound;
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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.height()
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&& (lowerBound == gridRect.bottom() || upperBound == gridRect.top())) {
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forceHide = true;
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} else {
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labelItem->setPos(labelItem->pos().x() , lowerBound - (delta / 2.0) - center.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().y() + boundingRect.height() > height || forceHide ||
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(labelItem->pos().y() + (heightDiff / 2.0) - 1.0) > axisRect.bottom() ||
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labelItem->pos().y() + (heightDiff / 2.0) < (axisRect.top() - 1.0)) {
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labelItem->setVisible(false);
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}
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else {
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labelItem->setVisible(true);
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height=labelItem->pos().y();
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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 lowerBound;
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qreal upperBound;
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if (i == 0) {
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lowerBound = gridRect.bottom();
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upperBound = layout[0];
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} else {
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lowerBound = layout[i];
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if (i == layout.size() - 1)
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upperBound = gridRect.top();
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else
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upperBound = qMax(layout[i + 1], gridRect.top());
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}
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if (lowerBound > gridRect.bottom())
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lowerBound = gridRect.bottom();
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if (upperBound < gridRect.top())
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upperBound = gridRect.top();
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shadeItem->setRect(gridRect.left(), upperBound, gridRect.width(),
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lowerBound - upperBound);
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if (shadeItem->rect().height() <= 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 y = gridItem->line().p1().y();
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if ((y < gridRect.top() || y > gridRect.bottom()))
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{
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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.left(), gridRect.top(), gridRect.right(), gridRect.top());
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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.bottom(), gridRect.right(), gridRect.bottom());
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gridLine->setVisible(true);
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}
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}
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QSizeF VerticalAxis::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.height() + (titlePadding() * 2.0), titleRect.width());
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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.height() + (titlePadding() * 2.0), titleRect.width());
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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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