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