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76d94eda23
Two warnings concerning division by zero and non-initialization of a member variable, respectively. Both are false positives. However, Coverity is excused because it probably doesn't understand std::vector<> and also can't know whether the object in question is generated in a different source file. Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
130 lines
4 KiB
C++
130 lines
4 KiB
C++
// SPDX-License-Identifier: GPL-2.0
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#include "legend.h"
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#include "statscolors.h"
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#include "zvalues.h"
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#include <QFontMetrics>
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#include <QGraphicsSceneMouseEvent>
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#include <QGraphicsWidget>
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#include <QPen>
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static const double legendBorderSize = 2.0;
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static const double legendBoxBorderSize = 1.0;
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static const double legendBoxScale = 0.8; // 1.0: text-height of the used font
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static const double legendInternalBorderSize = 2.0;
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static const QColor legendColor(0x00, 0x8e, 0xcc, 192); // Note: fourth argument is opacity
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static const QColor legendBorderColor(Qt::black);
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Legend::Legend(QGraphicsWidget *chart, const std::vector<QString> &names) :
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QGraphicsRectItem(chart), chart(chart), displayedItems(0), width(0.0), height(0.0)
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{
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setZValue(ZValues::legend);
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entries.reserve(names.size());
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int idx = 0;
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for (const QString &name: names)
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entries.emplace_back(name, idx++, (int)names.size(), this);
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// Calculate the height and width of the elements
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if (!entries.empty()) {
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QFontMetrics fm(entries[0].text->font());
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fontHeight = fm.height();
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for (Entry &e: entries)
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e.width = fontHeight + 2.0 * legendBoxBorderSize +
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fm.size(Qt::TextSingleLine, e.text->text()).width();
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} else {
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// Set to an arbitrary non-zero value, because Coverity doesn't understand
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// that we don't use the value as divisor below if entries is empty.
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fontHeight = 10.0;
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}
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setPen(QPen(legendBorderColor, legendBorderSize));
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setBrush(QBrush(legendColor));
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resize(); // Draw initial legend
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}
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Legend::Entry::Entry(const QString &name, int idx, int numBins, QGraphicsItem *parent) :
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rect(new QGraphicsRectItem(parent)),
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text(new QGraphicsSimpleTextItem(name, parent)),
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width(0)
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{
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rect->setZValue(ZValues::legend);
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rect->setPen(QPen(legendBorderColor, legendBoxBorderSize));
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rect->setBrush(QBrush(binColor(idx, numBins)));
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text->setZValue(ZValues::legend);
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text->setBrush(QBrush(darkLabelColor));
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}
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void Legend::hide()
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{
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for (Entry &e: entries) {
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e.rect->hide();
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e.text->hide();
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}
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QGraphicsRectItem::hide();
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}
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void Legend::resize()
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{
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if (entries.empty())
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return hide();
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QSizeF size = chart->size();
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// Silly heuristics: make the legend at most half as high and half as wide as the chart.
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// Not sure if that makes sense - this might need some optimization.
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int maxRows = static_cast<int>(size.height() / 2.0 - 2.0 * legendInternalBorderSize) / fontHeight;
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if (maxRows <= 0)
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return hide();
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int numColumns = ((int)entries.size() - 1) / maxRows + 1;
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int numRows = ((int)entries.size() - 1) / numColumns + 1;
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double x = legendInternalBorderSize;
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displayedItems = 0;
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for (int col = 0; col < numColumns; ++col) {
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double y = legendInternalBorderSize;
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double nextX = x;
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for (int row = 0; row < numRows; ++row) {
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int idx = col * numRows + row;
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if (idx >= (int)entries.size())
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break;
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entries[idx].pos = QPointF(x, y);
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nextX = std::max(nextX, x + entries[idx].width);
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y += fontHeight;
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++displayedItems;
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}
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x += nextX;
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width = nextX;
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if (width >= size.width() / 2.0) // More than half the chart-width -> give up
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break;
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}
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width += legendInternalBorderSize;
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height = 2 * legendInternalBorderSize + numRows * fontHeight;
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updatePosition();
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}
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void Legend::updatePosition()
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{
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if (displayedItems <= 0)
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return hide();
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// For now, place the legend in the top right corner.
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QPointF pos(chart->size().width() - width - 10.0, 10.0);
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setRect(QRectF(pos, QSizeF(width, height)));
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for (int i = 0; i < displayedItems; ++i) {
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QPointF itemPos = pos + entries[i].pos;
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QRectF rect(itemPos, QSizeF(fontHeight, fontHeight));
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// Decrease box size by legendBoxScale factor
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double delta = fontHeight * (1.0 - legendBoxScale) / 2.0;
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rect = rect.adjusted(delta, delta, -delta, -delta);
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entries[i].rect->setRect(rect);
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itemPos.rx() += fontHeight + 2.0 * legendBoxBorderSize;
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entries[i].text->setPos(itemPos);
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entries[i].rect->show();
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entries[i].text->show();
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}
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for (int i = displayedItems; i < (int)entries.size(); ++i) {
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entries[i].rect->hide();
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entries[i].text->hide();
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}
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show();
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}
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