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/****************************************************************************
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**
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** Copyright (C) 2013 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.digia.com
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**
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** This file is part of the Qt Commercial Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written 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.digia.com
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "horizontalaxis_p.h"
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#include "qabstractaxis.h"
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#include <QFontMetrics>
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#include <qmath.h>
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#include <QDebug>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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HorizontalAxis::HorizontalAxis(QAbstractAxis *axis, QGraphicsItem* item , bool intervalAxis)
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: ChartAxis(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 = ChartAxis::layout();
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if (layout.isEmpty())
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return;
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QStringList labelList = labels();
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QList<QGraphicsItem *> lines = lineItems();
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QList<QGraphicsItem *> labels = labelItems();
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QList<QGraphicsItem *> shades = shadeItems();
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QList<QGraphicsItem *> axis = arrowItems();
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QGraphicsSimpleTextItem* 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 *>(axis.at(0));
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if (alignment() == Qt::AlignTop)
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arrowItem->setLine(gridRect.left(), axisRect.bottom(), gridRect.right(), axisRect.bottom());
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else if (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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QFontMetrics fn(font());
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//title
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int titlePad = 0;
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QRectF titleBoundingRect;
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if (!titleText().isEmpty() && titleItem()->isVisible()) {
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QFontMetrics fn(title->font());
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int size(0);
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size = gridRect.width();
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QString titleText = this->titleText();
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if (fn.boundingRect(titleText).width() > size) {
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QString string = titleText + "...";
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while (fn.boundingRect(string).width() > size && string.length() > 3)
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string.remove(string.length() - 4, 1);
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title->setText(string);
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} else {
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title->setText(titleText);
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}
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titlePad = titlePadding();
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titleBoundingRect = title->boundingRect();
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QPointF center = gridRect.center() - titleBoundingRect.center();
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if (alignment() == Qt::AlignTop) {
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title->setPos(center.x(), axisRect.top() + titlePad);
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} else if (alignment() == Qt::AlignBottom) {
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title->setPos(center.x(), axisRect.bottom() - titleBoundingRect.height() - titlePad);
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}
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}
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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*>(axis.at(i + 1));
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QGraphicsSimpleTextItem *labelItem = static_cast<QGraphicsSimpleTextItem *>(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 = labelBoundingRect(fn, text);
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qreal size = axisRect.bottom() - axisRect.top() - labelPadding() - titleBoundingRect.height() - (titlePad * 2);
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if (boundingRect.height() > size) {
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QString label = text + "...";
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while (boundingRect.height() >= size && label.length() > 3) {
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label.remove(label.length() - 4, 1);
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boundingRect = labelBoundingRect(fn, label);
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}
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labelItem->setText(label);
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} else {
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labelItem->setText(text);
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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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int heightDiff = rect.height() - boundingRect.height();
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//ticks and label position
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if (alignment() == Qt::AlignTop) {
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labelItem->setPos(layout[i] - center.x(), axisRect.bottom() - rect.height() + (heightDiff / 2) - labelPadding());
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tickItem->setLine(layout[i], axisRect.bottom(), layout[i], axisRect.bottom() - labelPadding());
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} else if (alignment() == Qt::AlignBottom) {
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labelItem->setPos(layout[i] - center.x(), axisRect.top() - (heightDiff / 2) + 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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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 || forceHide ||
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labelItem->pos().x() < (axisRect.left() - 1.0) ||
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(labelItem->pos().x() + boundingRect.width() - 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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if ((i + 1) % 2 && i > 1) {
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QGraphicsRectItem *rectItem = static_cast<QGraphicsRectItem *>(shades.at(i / 2 - 1));
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qreal leftBound = qMax(layout[i - 1], gridRect.left());
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qreal rightBound = qMin(layout[i], gridRect.right());
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rectItem->setRect(leftBound, gridRect.top(), rightBound - leftBound, gridRect.height());
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if (rectItem->rect().width() <= 0.0)
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rectItem->setVisible(false);
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else
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rectItem->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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QFontMetrics fn(titleFont());
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QSizeF sh(0,0);
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if (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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sh = QSizeF(fn.boundingRect("...").width(), fn.height() + (titlePadding() * 2));
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break;
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case Qt::MaximumSize:
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case Qt::PreferredSize:
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sh = QSizeF(fn.boundingRect(axis()->titleText()).width(), fn.height() + (titlePadding() * 2));
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break;
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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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QTCOMMERCIALCHART_END_NAMESPACE
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