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fix painting coordinates and added LGPL
fix painting coordinates and added LGPL

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horizontalaxis.cpp
383 lines | 17.0 KiB | text/x-c | CppLexer
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Charts module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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** $QT_END_LICENSE$
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****************************************************************************/
#include <private/horizontalaxis_p.h>
#include <private/qabstractaxis_p.h>
#include <private/chartpresenter_p.h>
#include <QtCharts/QCategoryAxis>
#include <QtCore/QtMath>
#include <QtCore/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() && axis()->type() != QAbstractAxis::AxisTypeLogValue)
return;
QStringList labelList = labels();
QList<QGraphicsItem *> labels = labelItems();
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();
}
if (layout.isEmpty() && axis()->type() == QAbstractAxis::AxisTypeLogValue)
return;
QList<QGraphicsItem *> lines = gridItems();
QList<QGraphicsItem *> shades = shadeItems();
QList<QGraphicsItem *> minorLines = minorGridItems();
QList<QGraphicsItem *> minorArrows = minorArrowItems();
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
if (axis()->isReverse()) {
gridItem->setLine(gridRect.right() - layout[i] + gridRect.left(), gridRect.top(),
gridRect.right() - layout[i] + gridRect.left(), gridRect.bottom());
} else {
gridItem->setLine(layout[i], gridRect.top(), layout[i], gridRect.bottom());
}
//label text wrapping
QString text;
if (axis()->isReverse() && axis()->type() != QAbstractAxis::AxisTypeCategory)
text = labelList.at(labelList.count() - i - 1);
else
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
QPointF labelPos;
if (axis()->alignment() == Qt::AlignTop) {
if (axis()->isReverse()) {
labelPos = QPointF(gridRect.right() - layout[layout.size() - i - 1]
+ gridRect.left() - center.x(),
axisRect.bottom() - rect.height()
+ (heightDiff / 2.0) - labelPadding());
tickItem->setLine(gridRect.right() + gridRect.left() - layout[i],
axisRect.bottom(),
gridRect.right() + gridRect.left() - layout[i],
axisRect.bottom() - labelPadding());
} else {
labelPos = QPointF(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) {
if (axis()->isReverse()) {
labelPos = QPointF(gridRect.right() - layout[layout.size() - i - 1]
+ gridRect.left() - center.x(),
axisRect.top() - (heightDiff / 2.0) + labelPadding());
tickItem->setLine(gridRect.right() + gridRect.left() - layout[i], axisRect.top(),
gridRect.right() + gridRect.left() - layout[i],
axisRect.top() + labelPadding());
} else {
labelPos = QPointF(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;
qreal rightBound;
if (axis()->isReverse()) {
leftBound = qMax(gridRect.right() + gridRect.left() - layout[i + 1],
gridRect.left());
rightBound = qMin(gridRect.right() + gridRect.left() - layout[i], gridRect.right());
} else {
leftBound = qMax(layout[i], gridRect.left());
rightBound = qMin(layout[i + 1], gridRect.right());
}
const qreal delta = rightBound - leftBound;
if (axis()->type() != QAbstractAxis::AxisTypeCategory) {
// 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())) {
forceHide = true;
} else {
labelPos.setX(leftBound + (delta / 2.0) - center.x());
}
} else {
QCategoryAxis *categoryAxis = static_cast<QCategoryAxis *>(axis());
if (categoryAxis->labelsPosition() == QCategoryAxis::AxisLabelsPositionCenter) {
if (delta < boundingRect.width()
&& (leftBound == gridRect.left() || rightBound == gridRect.right())) {
forceHide = true;
} else {
labelPos.setX(leftBound + (delta / 2.0) - center.x());
}
} else if (categoryAxis->labelsPosition()
== QCategoryAxis::AxisLabelsPositionOnValue) {
if (axis()->isReverse())
labelPos.setX(leftBound - center.x());
else
labelPos.setX(rightBound - center.x());
}
}
}
// Round to full pixel via QPoint to avoid one pixel clipping on the edge in some cases
labelItem->setPos(labelPos.toPoint());
//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
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 leftBound;
qreal rightBound;
if (i == 0) {
if (axis()->isReverse()) {
leftBound = gridRect.right() + gridRect.left() - layout[i];
rightBound = gridRect.right();
} else {
leftBound = gridRect.left();
rightBound = layout[0];
}
} else {
if (axis()->isReverse()) {
rightBound = gridRect.right() + gridRect.left() - layout[i];
if (i == layout.size() - 1) {
leftBound = gridRect.left();
} else {
leftBound = qMax(gridRect.right() + gridRect.left() - layout[i + 1],
gridRect.left());
}
} else {
leftBound = layout[i];
if (i == layout.size() - 1)
rightBound = gridRect.right();
else
rightBound = qMin(layout[i + 1], gridRect.right());
}
}
if (leftBound < gridRect.left())
leftBound = gridRect.left();
if (rightBound > gridRect.right())
rightBound = gridRect.right();
shadeItem->setRect(leftBound, gridRect.top(), rightBound - leftBound,
gridRect.height());
if (shadeItem->rect().width() <= 0.0)
shadeItem->setVisible(false);
else
shadeItem->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);
}
// add minor ticks
QValueAxis *valueAxis = qobject_cast<QValueAxis *>(axis());
if ((i + 1) != layout.size() && valueAxis) {
int minorTickCount = valueAxis->minorTickCount();
if (minorTickCount != 0) {
qreal minorTickDistance = (layout[i] - layout[i + 1]) / qreal(minorTickCount + 1);
if (axis()->isReverse())
minorTickDistance = -minorTickDistance;
for (int j = 0; j < minorTickCount; j++) {
QGraphicsLineItem *minorGridItem =
static_cast<QGraphicsLineItem *>(minorLines.at(i * minorTickCount + j));
QGraphicsLineItem *minorArrowItem =
static_cast<QGraphicsLineItem *>(minorArrows.at(i * minorTickCount + j));
minorGridItem->setLine(gridItem->line().p1().x()
- minorTickDistance * qreal(j + 1),
gridRect.top(),
gridItem->line().p1().x()
- minorTickDistance * qreal(j + 1),
gridRect.bottom());
if (axis()->alignment() == Qt::AlignTop) {
minorArrowItem->setLine(minorGridItem->line().p1().x(),
axisRect.bottom(),
minorGridItem->line().p1().x(),
axisRect.bottom() - labelPadding() / 2);
} else if (axis()->alignment() == Qt::AlignBottom){
minorArrowItem->setLine(minorGridItem->line().p1().x(),
axisRect.top(),
minorGridItem->line().p1().x(),
axisRect.top() + labelPadding() / 2);
}
// check if the minor grid line and the axis tick should be shown
qreal minorXPos = minorGridItem->line().p1().x();
if (minorXPos < gridRect.left() || minorXPos > gridRect.right()) {
minorGridItem->setVisible(false);
minorArrowItem->setVisible(false);
} else {
minorGridItem->setVisible(true);
minorArrowItem->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