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15f20961c7
The DiveTextItems were redrawn on every paint() call. This was a prohibitively expensive operation (converting the text into a path, drawing an outline, etc.), which was called numerous times. Instead, render the text only when changing into a QPixmap and blit that pixmap in the paint() call. This will make it possible to do absolutely positioned DiveTextItems. So far they were placed relatively in scene coordinates ranging from 0-100(!). Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
95 lines
2.4 KiB
C++
95 lines
2.4 KiB
C++
// SPDX-License-Identifier: GPL-2.0
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#include "divetextitem.h"
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#include "profilewidget2.h"
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#include "core/color.h"
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#include "core/errorhelper.h"
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#include <QBrush>
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#include <QApplication>
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static const double outlineSize = 3.0;
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DiveTextItem::DiveTextItem(double dpr, double scale, int alignFlags, QGraphicsItem *parent) : QGraphicsPixmapItem(parent),
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internalAlignFlags(alignFlags),
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dpr(dpr),
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scale(scale)
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{
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setFlag(ItemIgnoresTransformations);
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}
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void DiveTextItem::set(const QString &t, const QBrush &b)
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{
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internalText = t;
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if (internalText.isEmpty()) {
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setPixmap(QPixmap());
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return;
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}
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QFont fnt = getFont(dpr, scale);
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QPainterPath textPath;
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textPath.addText(0.0, 0.0, fnt, internalText);
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QPainterPathStroker stroker;
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stroker.setWidth(outlineSize * dpr);
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QPainterPath outlinePath = stroker.createStroke(textPath);
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QRectF outlineRect = outlinePath.boundingRect();
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textPath.translate(-outlineRect.topLeft());
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outlinePath.translate(-outlineRect.topLeft());
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QPixmap pixmap(outlineRect.size().toSize());
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pixmap.fill(Qt::transparent);
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{
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QPainter painter(&pixmap);
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painter.setRenderHints(QPainter::Antialiasing);
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painter.setBrush(QBrush(getColor(TEXT_BACKGROUND)));
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painter.setPen(Qt::NoPen);
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painter.drawPath(outlinePath);
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painter.setBrush(b);
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painter.setPen(Qt::NoPen);
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painter.drawPath(textPath);
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}
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setPixmap(pixmap);
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double yOffset = (internalAlignFlags & Qt::AlignTop) ? 0.0 :
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(internalAlignFlags & Qt::AlignBottom) ? -outlineRect.height() :
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/*(internalAlignFlags & Qt::AlignVCenter ? */ -outlineRect.height() / 2.0;
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double xOffset = (internalAlignFlags & Qt::AlignLeft) ? -outlineRect.width() :
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(internalAlignFlags & Qt::AlignHCenter) ? -outlineRect.width() / 2.0 :
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/* (internalAlignFlags & Qt::AlignRight) */ 0.0;
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setOffset(xOffset, yOffset);
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}
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const QString &DiveTextItem::text()
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{
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return internalText;
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}
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QFont DiveTextItem::getFont(double dpr, double scale)
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{
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QFont fnt(qApp->font());
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double size = fnt.pixelSize();
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if (size > 0) {
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// set in pixels - so the scale factor may not make a difference if it's too close to 1
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size *= scale * dpr;
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fnt.setPixelSize(lrint(size));
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} else {
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size = fnt.pointSizeF();
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size *= scale * dpr;
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fnt.setPointSizeF(size);
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}
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return fnt;
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}
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double DiveTextItem::fontHeight(double dpr, double scale)
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{
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QFont fnt = getFont(dpr, scale);
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QFontMetrics fm(fnt);
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return (double)fm.height();
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}
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double DiveTextItem::height() const
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{
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return fontHeight(dpr, scale) + outlineSize * dpr;
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}
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