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Diffstat (limited to 'src/charts/axis/horizontalaxis.cpp')
-rw-r--r-- | src/charts/axis/horizontalaxis.cpp | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/src/charts/axis/horizontalaxis.cpp b/src/charts/axis/horizontalaxis.cpp new file mode 100644 index 00000000..941afc05 --- /dev/null +++ b/src/charts/axis/horizontalaxis.cpp @@ -0,0 +1,227 @@ +/**************************************************************************** +** +** Copyright (C) 2014 Digia Plc +** All rights reserved. +** For any questions to Digia, please use contact form at http://qt.digia.com +** +** This file is part of the Qt Enterprise Charts Add-on. +** +** $QT_BEGIN_LICENSE$ +** Licensees holding valid Qt Enterprise licenses may use this file in +** accordance with the Qt Enterprise 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.digia.com +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "horizontalaxis_p.h" +#include "qabstractaxis_p.h" +#include "chartpresenter_p.h" +#include <qmath.h> +#include <QDebug> + +QT_CHARTS_BEGIN_NAMESPACE + +HorizontalAxis::HorizontalAxis(QAbstractAxis *axis, QGraphicsItem *item, bool intervalAxis) + : CartesianChartAxis(axis, item, intervalAxis) +{ +} + +HorizontalAxis::~HorizontalAxis() +{ +} + +void HorizontalAxis::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(); + + //arrow + QGraphicsLineItem *arrowItem = static_cast<QGraphicsLineItem *>(arrow.at(0)); + + if (axis()->alignment() == Qt::AlignTop) + arrowItem->setLine(gridRect.left(), axisRect.bottom(), gridRect.right(), axisRect.bottom()); + else if (axis()->alignment() == Qt::AlignBottom) + arrowItem->setLine(gridRect.left(), axisRect.top(), gridRect.right(), axisRect.top()); + + qreal width = 0; + const QLatin1String ellipsis("..."); + + //title + QRectF titleBoundingRect; + QString titleText = axis()->titleText(); + qreal availableSpace = axisRect.height() - labelPadding(); + if (!titleText.isEmpty() && titleItem()->isVisible()) { + availableSpace -= titlePadding() * 2.0; + qreal minimumLabelHeight = ChartPresenter::textBoundingRect(axis()->labelsFont(), + QStringLiteral("...")).height(); + qreal titleSpace = availableSpace - minimumLabelHeight; + title->setHtml(ChartPresenter::truncatedText(axis()->titleFont(), titleText, qreal(0.0), + gridRect.width(), titleSpace, + titleBoundingRect)); + title->setTextWidth(titleBoundingRect.width()); + + titleBoundingRect = title->boundingRect(); + + QPointF center = gridRect.center() - titleBoundingRect.center(); + if (axis()->alignment() == Qt::AlignTop) + title->setPos(center.x(), axisRect.top() + titlePadding()); + else if (axis()->alignment() == Qt::AlignBottom) + title->setPos(center.x(), axisRect.bottom() - titleBoundingRect.height() - titlePadding()); + + 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(layout[i], gridRect.top(), layout[i], gridRect.bottom()); + + //label text wrapping + QString text = labelList.at(i); + QRectF boundingRect; + // don't truncate empty labels + if (text.isEmpty()) { + labelItem->setHtml(text); + } else { + qreal labelWidth = axisRect.width() / layout.count() - (2 * labelPadding()); + QString truncatedText = ChartPresenter::truncatedText(axis()->labelsFont(), text, + axis()->labelsAngle(), + labelWidth, + availableSpace, 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 heightDiff = rect.height() - boundingRect.height(); + qreal widthDiff = rect.width() - boundingRect.width(); + + //ticks and label position + if (axis()->alignment() == Qt::AlignTop) { + labelItem->setPos(layout[i] - center.x(), axisRect.bottom() - rect.height() + (heightDiff / 2.0) - labelPadding()); + tickItem->setLine(layout[i], axisRect.bottom(), layout[i], axisRect.bottom() - labelPadding()); + } else if (axis()->alignment() == Qt::AlignBottom) { + labelItem->setPos(layout[i] - center.x(), axisRect.top() - (heightDiff / 2.0) + labelPadding()); + tickItem->setLine(layout[i], axisRect.top(), layout[i], axisRect.top() + labelPadding()); + } + + //label in between + bool forceHide = false; + if (intervalAxis() && (i + 1) != layout.size()) { + qreal leftBound = qMax(layout[i], gridRect.left()); + qreal rightBound = qMin(layout[i + 1], gridRect.right()); + const qreal delta = rightBound - leftBound; + // Hide label in case visible part of the category at the grid edge is too narrow + if (delta < boundingRect.width() + && (leftBound == gridRect.left() || rightBound == gridRect.right()) + && !intervalAxis()) { + forceHide = true; + } else { + labelItem->setPos(leftBound + (delta / 2.0) - center.x(), labelItem->pos().y()); + } + } + + //label overlap detection - compensate one pixel for rounding errors + if ((labelItem->pos().x() < width && labelItem->toPlainText() == ellipsis) || forceHide || + (labelItem->pos().x() + (widthDiff / 2.0)) < (axisRect.left() - 1.0) || + (labelItem->pos().x() + (widthDiff / 2.0) - 1.0) > axisRect.right()) { + labelItem->setVisible(false); + } else { + labelItem->setVisible(true); + width = boundingRect.width() + labelItem->pos().x(); + } + + //shades + if ((i + 1) % 2 && i > 1) { + QGraphicsRectItem *rectItem = static_cast<QGraphicsRectItem *>(shades.at(i / 2 - 1)); + qreal leftBound = qMax(layout[i - 1], gridRect.left()); + qreal rightBound = qMin(layout[i], gridRect.right()); + rectItem->setRect(leftBound, gridRect.top(), rightBound - leftBound, gridRect.height()); + if (rectItem->rect().width() <= 0.0) + rectItem->setVisible(false); + else + rectItem->setVisible(true); + } + + // check if the grid line and the axis tick should be shown + qreal x = gridItem->line().p1().x(); + if (x < gridRect.left() || x > gridRect.right()) { + 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.right(), gridRect.top(), gridRect.right(), gridRect.bottom()); + gridLine->setVisible(true); + gridLine = static_cast<QGraphicsLineItem*>(lines.at(layout.size()+1)); + gridLine->setLine(gridRect.left(), gridRect.top(), gridRect.left(), gridRect.bottom()); + gridLine->setVisible(true); + } +} + +QSizeF HorizontalAxis::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.width(), titleRect.height() + (titlePadding() * 2.0)); + break; + } + case Qt::MaximumSize: + case Qt::PreferredSize: { + QRectF titleRect = ChartPresenter::textBoundingRect(axis()->titleFont(), axis()->titleText()); + sh = QSizeF(titleRect.width(), titleRect.height() + (titlePadding() * 2.0)); + break; + } + default: + break; + } + + return sh; +} + +QT_CHARTS_END_NAMESPACE |