polarchartaxisangular.cpp
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r2483 | /**************************************************************************** | ||
** | ||||
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r2776 | ** Copyright (C) 2015 The Qt Company Ltd | ||
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r2483 | ** All rights reserved. | ||
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r2776 | ** For any questions to The Qt Company, please use contact form at http://qt.io | ||
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r2483 | ** | ||
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r2740 | ** This file is part of the Qt Charts module. | ||
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r2483 | ** | ||
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r2740 | ** 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 | ||||
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r2776 | ** agreement between you and The Qt Company. | ||
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r2483 | ** | ||
** If you have questions regarding the use of this file, please use | ||||
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r2740 | ** contact form at http://qt.io | ||
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r2483 | ** | ||
****************************************************************************/ | ||||
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r2714 | #include <private/polarchartaxisangular_p.h> | ||
#include <private/chartpresenter_p.h> | ||||
#include <private/abstractchartlayout_p.h> | ||||
#include <QtCharts/QAbstractAxis> | ||||
#include <private/qabstractaxis_p.h> | ||||
#include <QtCore/QDebug> | ||||
#include <QtCore/QtMath> | ||||
#include <QtGui/QTextDocument> | ||||
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r2483 | |||
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r2712 | QT_CHARTS_BEGIN_NAMESPACE | ||
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r2483 | |||
PolarChartAxisAngular::PolarChartAxisAngular(QAbstractAxis *axis, QGraphicsItem *item, bool intervalAxis) | ||||
: PolarChartAxis(axis, item, intervalAxis) | ||||
{ | ||||
} | ||||
PolarChartAxisAngular::~PolarChartAxisAngular() | ||||
{ | ||||
} | ||||
void PolarChartAxisAngular::updateGeometry() | ||||
{ | ||||
QGraphicsLayoutItem::updateGeometry(); | ||||
const QVector<qreal> &layout = this->layout(); | ||||
if (layout.isEmpty()) | ||||
return; | ||||
createAxisLabels(layout); | ||||
QStringList labelList = labels(); | ||||
QPointF center = axisGeometry().center(); | ||||
QList<QGraphicsItem *> arrowItemList = arrowItems(); | ||||
QList<QGraphicsItem *> gridItemList = gridItems(); | ||||
QList<QGraphicsItem *> labelItemList = labelItems(); | ||||
QList<QGraphicsItem *> shadeItemList = shadeItems(); | ||||
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r2539 | QGraphicsTextItem *title = titleItem(); | ||
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r2483 | |||
QGraphicsEllipseItem *axisLine = static_cast<QGraphicsEllipseItem *>(arrowItemList.at(0)); | ||||
axisLine->setRect(axisGeometry()); | ||||
qreal radius = axisGeometry().height() / 2.0; | ||||
QRectF previousLabelRect; | ||||
QRectF firstLabelRect; | ||||
qreal labelHeight = 0; | ||||
bool firstShade = true; | ||||
bool nextTickVisible = false; | ||||
if (layout.size()) | ||||
nextTickVisible = !(layout.at(0) < 0.0 || layout.at(0) > 360.0); | ||||
for (int i = 0; i < layout.size(); ++i) { | ||||
qreal angularCoordinate = layout.at(i); | ||||
QGraphicsLineItem *gridLineItem = static_cast<QGraphicsLineItem *>(gridItemList.at(i)); | ||||
QGraphicsLineItem *tickItem = static_cast<QGraphicsLineItem *>(arrowItemList.at(i + 1)); | ||||
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r2539 | QGraphicsTextItem *labelItem = static_cast<QGraphicsTextItem *>(labelItemList.at(i)); | ||
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r2483 | QGraphicsPathItem *shadeItem = 0; | ||
if (i == 0) | ||||
shadeItem = static_cast<QGraphicsPathItem *>(shadeItemList.at(0)); | ||||
else if (i % 2) | ||||
shadeItem = static_cast<QGraphicsPathItem *>(shadeItemList.at((i / 2) + 1)); | ||||
// Ignore ticks outside valid range | ||||
bool currentTickVisible = nextTickVisible; | ||||
if ((i == layout.size() - 1) | ||||
|| layout.at(i + 1) < 0.0 | ||||
|| layout.at(i + 1) > 360.0) { | ||||
nextTickVisible = false; | ||||
} else { | ||||
nextTickVisible = true; | ||||
} | ||||
qreal labelCoordinate = angularCoordinate; | ||||
qreal labelVisible = currentTickVisible; | ||||
if (intervalAxis()) { | ||||
qreal farEdge; | ||||
if (i == (layout.size() - 1)) | ||||
farEdge = 360.0; | ||||
else | ||||
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r2504 | farEdge = qMin(qreal(360.0), layout.at(i + 1)); | ||
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r2483 | |||
// Adjust the labelCoordinate to show it if next tick is visible | ||||
if (nextTickVisible) | ||||
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r2504 | labelCoordinate = qMax(qreal(0.0), labelCoordinate); | ||
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r2483 | |||
labelCoordinate = (labelCoordinate + farEdge) / 2.0; | ||||
// Don't display label once the category gets too small near the axis | ||||
if (labelCoordinate < 5.0 || labelCoordinate > 355.0) | ||||
labelVisible = false; | ||||
else | ||||
labelVisible = true; | ||||
} | ||||
// Need this also in label calculations, so determine it first | ||||
QLineF tickLine(QLineF::fromPolar(radius - tickWidth(), 90.0 - angularCoordinate).p2(), | ||||
QLineF::fromPolar(radius + tickWidth(), 90.0 - angularCoordinate).p2()); | ||||
tickLine.translate(center); | ||||
// Angular axis label | ||||
if (axis()->labelsVisible() && labelVisible) { | ||||
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r2607 | QRectF boundingRect = ChartPresenter::textBoundingRect(axis()->labelsFont(), | ||
labelList.at(i), | ||||
axis()->labelsAngle()); | ||||
labelItem->setTextWidth(boundingRect.width()); | ||||
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r2539 | labelItem->setHtml(labelList.at(i)); | ||
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r2483 | const QRectF &rect = labelItem->boundingRect(); | ||
QPointF labelCenter = rect.center(); | ||||
labelItem->setTransformOriginPoint(labelCenter.x(), labelCenter.y()); | ||||
boundingRect.moveCenter(labelCenter); | ||||
QPointF positionDiff(rect.topLeft() - boundingRect.topLeft()); | ||||
QPointF labelPoint; | ||||
if (intervalAxis()) { | ||||
QLineF labelLine = QLineF::fromPolar(radius + tickWidth(), 90.0 - labelCoordinate); | ||||
labelLine.translate(center); | ||||
labelPoint = labelLine.p2(); | ||||
} else { | ||||
labelPoint = tickLine.p2(); | ||||
} | ||||
QRectF labelRect = moveLabelToPosition(labelCoordinate, labelPoint, boundingRect); | ||||
labelItem->setPos(labelRect.topLeft() + positionDiff); | ||||
// Store height for title calculations | ||||
qreal labelClearance = axisGeometry().top() - labelRect.top(); | ||||
labelHeight = qMax(labelHeight, labelClearance); | ||||
// Label overlap detection | ||||
if (i && (previousLabelRect.intersects(labelRect) || firstLabelRect.intersects(labelRect))) { | ||||
labelVisible = false; | ||||
} else { | ||||
// Store labelRect for future comparison. Some area is deducted to make things look | ||||
// little nicer, as usually intersection happens at label corner with angular labels. | ||||
labelRect.adjust(-2.0, -4.0, -2.0, -4.0); | ||||
if (firstLabelRect.isEmpty()) | ||||
firstLabelRect = labelRect; | ||||
previousLabelRect = labelRect; | ||||
labelVisible = true; | ||||
} | ||||
} | ||||
labelItem->setVisible(labelVisible); | ||||
if (!currentTickVisible) { | ||||
gridLineItem->setVisible(false); | ||||
tickItem->setVisible(false); | ||||
if (shadeItem) | ||||
shadeItem->setVisible(false); | ||||
continue; | ||||
} | ||||
// Angular grid line | ||||
QLineF gridLine = QLineF::fromPolar(radius, 90.0 - angularCoordinate); | ||||
gridLine.translate(center); | ||||
gridLineItem->setLine(gridLine); | ||||
gridLineItem->setVisible(true); | ||||
// Tick | ||||
tickItem->setLine(tickLine); | ||||
tickItem->setVisible(true); | ||||
// Shades | ||||
if (i % 2 || (i == 0 && !nextTickVisible)) { | ||||
QPainterPath path; | ||||
path.moveTo(center); | ||||
if (i == 0) { | ||||
// If first tick is also the last, we need to custom fill the first partial arc | ||||
// or it won't get filled. | ||||
path.arcTo(axisGeometry(), 90.0 - layout.at(0), layout.at(0)); | ||||
path.closeSubpath(); | ||||
} else { | ||||
qreal nextCoordinate; | ||||
if (!nextTickVisible) // Last visible tick | ||||
nextCoordinate = 360.0; | ||||
else | ||||
nextCoordinate = layout.at(i + 1); | ||||
qreal arcSpan = angularCoordinate - nextCoordinate; | ||||
path.arcTo(axisGeometry(), 90.0 - angularCoordinate, arcSpan); | ||||
path.closeSubpath(); | ||||
// Add additional arc for first shade item if there is a partial arc to be filled | ||||
if (firstShade) { | ||||
QGraphicsPathItem *specialShadeItem = static_cast<QGraphicsPathItem *>(shadeItemList.at(0)); | ||||
if (layout.at(i - 1) > 0.0) { | ||||
QPainterPath specialPath; | ||||
specialPath.moveTo(center); | ||||
specialPath.arcTo(axisGeometry(), 90.0 - layout.at(i - 1), layout.at(i - 1)); | ||||
specialPath.closeSubpath(); | ||||
specialShadeItem->setPath(specialPath); | ||||
specialShadeItem->setVisible(true); | ||||
} else { | ||||
specialShadeItem->setVisible(false); | ||||
} | ||||
} | ||||
} | ||||
shadeItem->setPath(path); | ||||
shadeItem->setVisible(true); | ||||
firstShade = false; | ||||
} | ||||
} | ||||
// Title, centered above the chart | ||||
QString titleText = axis()->titleText(); | ||||
if (!titleText.isEmpty() && axis()->isTitleVisible()) { | ||||
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r2607 | QRectF truncatedRect; | ||
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r2604 | qreal availableTitleHeight = axisGeometry().height() - labelPadding() - titlePadding() * 2.0; | ||
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r2712 | qreal minimumLabelHeight = ChartPresenter::textBoundingRect(axis()->labelsFont(), | ||
QStringLiteral("...")).height(); | ||||
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r2604 | availableTitleHeight -= minimumLabelHeight; | ||
title->setHtml(ChartPresenter::truncatedText(axis()->titleFont(), titleText, qreal(0.0), | ||||
axisGeometry().width(), availableTitleHeight, | ||||
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r2607 | truncatedRect)); | ||
title->setTextWidth(truncatedRect.width()); | ||||
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r2483 | |||
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r2534 | QRectF titleBoundingRect = title->boundingRect(); | ||
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r2483 | QPointF titleCenter = center - titleBoundingRect.center(); | ||
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r2540 | title->setPos(titleCenter.x(), axisGeometry().top() - titlePadding() * 2.0 - titleBoundingRect.height() - labelHeight); | ||
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r2483 | } | ||
} | ||||
Qt::Orientation PolarChartAxisAngular::orientation() const | ||||
{ | ||||
return Qt::Horizontal; | ||||
} | ||||
void PolarChartAxisAngular::createItems(int count) | ||||
{ | ||||
if (arrowItems().count() == 0) { | ||||
// angular axis line | ||||
QGraphicsEllipseItem *arrow = new QGraphicsEllipseItem(presenter()->rootItem()); | ||||
arrow->setPen(axis()->linePen()); | ||||
arrowGroup()->addToGroup(arrow); | ||||
} | ||||
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r2608 | QGraphicsTextItem *title = titleItem(); | ||
title->setFont(axis()->titleFont()); | ||||
title->setDefaultTextColor(axis()->titleBrush().color()); | ||||
title->setHtml(axis()->titleText()); | ||||
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r2483 | for (int i = 0; i < count; ++i) { | ||
QGraphicsLineItem *arrow = new QGraphicsLineItem(presenter()->rootItem()); | ||||
QGraphicsLineItem *grid = new QGraphicsLineItem(presenter()->rootItem()); | ||||
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r2539 | QGraphicsTextItem *label = new QGraphicsTextItem(presenter()->rootItem()); | ||
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r2592 | label->document()->setDocumentMargin(ChartPresenter::textMargin()); | ||
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r2483 | arrow->setPen(axis()->linePen()); | ||
grid->setPen(axis()->gridLinePen()); | ||||
label->setFont(axis()->labelsFont()); | ||||
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r2539 | label->setDefaultTextColor(axis()->labelsBrush().color()); | ||
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r2483 | label->setRotation(axis()->labelsAngle()); | ||
arrowGroup()->addToGroup(arrow); | ||||
gridGroup()->addToGroup(grid); | ||||
labelGroup()->addToGroup(label); | ||||
if (gridItems().size() == 1 || (((gridItems().size() + 1) % 2) && gridItems().size() > 0)) { | ||||
QGraphicsPathItem *shade = new QGraphicsPathItem(presenter()->rootItem()); | ||||
shade->setPen(axis()->shadesPen()); | ||||
shade->setBrush(axis()->shadesBrush()); | ||||
shadeGroup()->addToGroup(shade); | ||||
} | ||||
} | ||||
} | ||||
void PolarChartAxisAngular::handleArrowPenChanged(const QPen &pen) | ||||
{ | ||||
bool first = true; | ||||
foreach (QGraphicsItem *item, arrowItems()) { | ||||
if (first) { | ||||
first = false; | ||||
// First arrow item is the outer circle of axis | ||||
static_cast<QGraphicsEllipseItem *>(item)->setPen(pen); | ||||
} else { | ||||
static_cast<QGraphicsLineItem *>(item)->setPen(pen); | ||||
} | ||||
} | ||||
} | ||||
void PolarChartAxisAngular::handleGridPenChanged(const QPen &pen) | ||||
{ | ||||
foreach (QGraphicsItem *item, gridItems()) | ||||
static_cast<QGraphicsLineItem *>(item)->setPen(pen); | ||||
} | ||||
QSizeF PolarChartAxisAngular::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const | ||||
{ | ||||
Q_UNUSED(which); | ||||
Q_UNUSED(constraint); | ||||
return QSizeF(-1, -1); | ||||
} | ||||
qreal PolarChartAxisAngular::preferredAxisRadius(const QSizeF &maxSize) | ||||
{ | ||||
qreal radius = maxSize.height() / 2.0; | ||||
if (maxSize.width() < maxSize.height()) | ||||
radius = maxSize.width() / 2.0; | ||||
if (axis()->labelsVisible()) { | ||||
QVector<qreal> layout = calculateLayout(); | ||||
if (layout.isEmpty()) | ||||
return radius; | ||||
createAxisLabels(layout); | ||||
QStringList labelList = labels(); | ||||
QFont font = axis()->labelsFont(); | ||||
QRectF maxRect; | ||||
maxRect.setSize(maxSize); | ||||
maxRect.moveCenter(QPointF(0.0, 0.0)); | ||||
// This is a horrible way to find out the maximum radius for angular axis and its labels. | ||||
// It just increments the radius down until everyhing fits the constraint size. | ||||
// Proper way would be to actually calculate it but this seems to work reasonably fast as it is. | ||||
bool nextTickVisible = false; | ||||
for (int i = 0; i < layout.size(); ) { | ||||
if ((i == layout.size() - 1) | ||||
|| layout.at(i + 1) < 0.0 | ||||
|| layout.at(i + 1) > 360.0) { | ||||
nextTickVisible = false; | ||||
} else { | ||||
nextTickVisible = true; | ||||
} | ||||
qreal labelCoordinate = layout.at(i); | ||||
qreal labelVisible; | ||||
if (intervalAxis()) { | ||||
qreal farEdge; | ||||
if (i == (layout.size() - 1)) | ||||
farEdge = 360.0; | ||||
else | ||||
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r2504 | farEdge = qMin(qreal(360.0), layout.at(i + 1)); | ||
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r2483 | |||
// Adjust the labelCoordinate to show it if next tick is visible | ||||
if (nextTickVisible) | ||||
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r2504 | labelCoordinate = qMax(qreal(0.0), labelCoordinate); | ||
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r2483 | |||
labelCoordinate = (labelCoordinate + farEdge) / 2.0; | ||||
} | ||||
if (labelCoordinate < 0.0 || labelCoordinate > 360.0) | ||||
labelVisible = false; | ||||
else | ||||
labelVisible = true; | ||||
if (!labelVisible) { | ||||
i++; | ||||
continue; | ||||
} | ||||
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r2539 | QRectF boundingRect = ChartPresenter::textBoundingRect(axis()->labelsFont(), labelList.at(i), axis()->labelsAngle()); | ||
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r2483 | QPointF labelPoint = QLineF::fromPolar(radius + tickWidth(), 90.0 - labelCoordinate).p2(); | ||
boundingRect = moveLabelToPosition(labelCoordinate, labelPoint, boundingRect); | ||||
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r2542 | QRectF intersectRect = maxRect.intersected(boundingRect); | ||
if (boundingRect.isEmpty() || intersectRect == boundingRect) { | ||||
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r2483 | i++; | ||
} else { | ||||
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r2542 | qreal reduction(0.0); | ||
// If there is no intersection, reduce by smallest dimension of label rect to be on the safe side | ||||
if (intersectRect.isEmpty()) { | ||||
reduction = qMin(boundingRect.height(), boundingRect.width()); | ||||
} else { | ||||
// Approximate needed radius reduction is the amount label rect exceeds max rect in either dimension. | ||||
// Could be further optimized by figuring out the proper math how to calculate exact needed reduction. | ||||
reduction = qMax(boundingRect.height() - intersectRect.height(), | ||||
boundingRect.width() - intersectRect.width()); | ||||
} | ||||
// Typically the approximated reduction is little low, so add one | ||||
radius -= (reduction + 1.0); | ||||
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r2483 | if (radius < 1.0) // safeguard | ||
return 1.0; | ||||
} | ||||
} | ||||
} | ||||
if (!axis()->titleText().isEmpty() && axis()->isTitleVisible()) { | ||||
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r2539 | QRectF titleRect = ChartPresenter::textBoundingRect(axis()->titleFont(), axis()->titleText()); | ||
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r2530 | |||
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r2534 | radius -= titlePadding() + (titleRect.height() / 2.0); | ||
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r2483 | if (radius < 1.0) // safeguard | ||
return 1.0; | ||||
} | ||||
return radius; | ||||
} | ||||
QRectF PolarChartAxisAngular::moveLabelToPosition(qreal angularCoordinate, QPointF labelPoint, QRectF labelRect) const | ||||
{ | ||||
if (angularCoordinate == 0.0) | ||||
labelRect.moveCenter(labelPoint + QPointF(0, -labelRect.height() / 2.0)); | ||||
else if (angularCoordinate < 90.0) | ||||
labelRect.moveBottomLeft(labelPoint); | ||||
else if (angularCoordinate == 90.0) | ||||
labelRect.moveCenter(labelPoint + QPointF(labelRect.width() / 2.0 + 2.0, 0)); // +2 so that it does not hit the radial axis | ||||
else if (angularCoordinate < 180.0) | ||||
labelRect.moveTopLeft(labelPoint); | ||||
else if (angularCoordinate == 180.0) | ||||
labelRect.moveCenter(labelPoint + QPointF(0, labelRect.height() / 2.0)); | ||||
else if (angularCoordinate < 270.0) | ||||
labelRect.moveTopRight(labelPoint); | ||||
else if (angularCoordinate == 270.0) | ||||
labelRect.moveCenter(labelPoint + QPointF(-labelRect.width() / 2.0 - 2.0, 0)); // -2 so that it does not hit the radial axis | ||||
else if (angularCoordinate < 360.0) | ||||
labelRect.moveBottomRight(labelPoint); | ||||
else | ||||
labelRect.moveCenter(labelPoint + QPointF(0, -labelRect.height() / 2.0)); | ||||
return labelRect; | ||||
} | ||||
#include "moc_polarchartaxisangular_p.cpp" | ||||
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r2712 | QT_CHARTS_END_NAMESPACE | ||