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cad00032fc
The info box was placed either above or below the mouse-pointer. If the pointer is at the center and the infobox higher than half the chart, it would cross the border. Detect this case and place the info box at the center. Same logic for right/left, though that should typically not happen. Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
#include "informationbox.h"
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#include "statscolors.h"
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#include "zvalues.h"
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#include <QChart>
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#include <QFontMetrics>
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static const QColor informationBorderColor(Qt::black);
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static const QColor informationColor(0xff, 0xff, 0x00, 192); // Note: fourth argument is opacity
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static const int informationBorder = 2;
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static const double informationBorderRadius = 4.0; // Radius of rounded corners
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static const int distanceFromPointer = 10; // Distance to place box from mouse pointer or scatter item
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InformationBox::InformationBox(QtCharts::QChart *chart) : RoundRectItem(informationBorderRadius, chart), chart(chart)
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{
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setPen(QPen(informationBorderColor, informationBorder));
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setBrush(informationColor);
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setZValue(ZValues::informationBox);
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}
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void InformationBox::setText(const std::vector<QString> &text, QPointF pos)
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{
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width = height = 0.0;
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textItems.clear();
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for (const QString &s: text) {
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if (!s.isEmpty())
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addLine(s);
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}
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width += 4.0 * informationBorder;
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height += 4.0 * informationBorder;
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// Setting the position will also set the proper size
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setPos(pos);
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}
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void InformationBox::setPos(QPointF pos)
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{
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QRectF plotArea = chart->plotArea();
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double x = pos.x() + distanceFromPointer;
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if (x + width >= plotArea.right()) {
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if (pos.x() - width >= plotArea.x())
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x = pos.x() - width;
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else
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x = pos.x() - width / 2.0;
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}
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double y = pos.y() + distanceFromPointer;
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if (y + height >= plotArea.bottom()) {
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if (pos.y() - height >= plotArea.y())
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y = pos.y() - height;
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else
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y = pos.y() - height / 2.0;
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}
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setRect(x, y, width, height);
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double actY = y + 2.0 * informationBorder;
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for (auto &item: textItems) {
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item->setPos(QPointF(x + 2.0 * informationBorder, actY));
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actY += item->boundingRect().height();
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}
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}
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void InformationBox::addLine(const QString &s)
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{
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textItems.emplace_back(new QGraphicsSimpleTextItem(s, this));
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QGraphicsSimpleTextItem &item = *textItems.back();
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item.setBrush(QBrush(darkLabelColor));
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item.setPos(QPointF(0.0, height));
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item.setFont(font);
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item.setZValue(ZValues::informationBox);
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QRectF rect = item.boundingRect();
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width = std::max(width, rect.width());
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height += rect.height();
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}
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// Try to stay within three-thirds of the chart height
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int InformationBox::recommendedMaxLines() const
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{
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QFontMetrics fm(font);
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int maxHeight = static_cast<int>(chart->plotArea().height());
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return maxHeight * 2 / fm.height() / 3;
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}
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