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fix: use a workaround to avoid pixelated when zoomed out

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GH-31
This commit is contained in:
Gary Wang 2021-06-20 14:59:44 +08:00
parent 4c07a89ca3
commit 36c54addce
3 changed files with 40 additions and 6 deletions
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40
app/graphicsscene.cpp
View File

@ -10,6 +10,38 @@
#include <QLabel> #include <QLabel>
#include <QPainter> #include <QPainter>
class PGraphicsPixmapItem : public QGraphicsPixmapItem
{
public:
PGraphicsPixmapItem(const QPixmap &pixmap, QGraphicsItem *parent = nullptr)
: QGraphicsPixmapItem(pixmap, parent)
{}
void setScaleHint(float scaleHint) {
m_scaleHint = scaleHint;
}
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
QWidget *widget) override
{
if (transformationMode() == Qt::FastTransformation) {
return QGraphicsPixmapItem::paint(painter, option, widget);
} else {
// painter->setRenderHints(QPainter::Antialiasing);
QSizeF resizedScale(boundingRect().size());
resizedScale *= m_scaleHint;
painter->drawPixmap(QRectF(offset(), boundingRect().size()).toRect(),
pixmap().scaled(resizedScale.toSize(),
Qt::KeepAspectRatio,
Qt::SmoothTransformation)
);
}
}
private:
float m_scaleHint = 1;
};
GraphicsScene::GraphicsScene(QObject *parent) GraphicsScene::GraphicsScene(QObject *parent)
: QGraphicsScene(parent) : QGraphicsScene(parent)
{ {
@ -24,7 +56,8 @@ GraphicsScene::~GraphicsScene()
void GraphicsScene::showImage(const QPixmap &pixmap) void GraphicsScene::showImage(const QPixmap &pixmap)
{ {
this->clear(); this->clear();
QGraphicsPixmapItem * pixmapItem = this->addPixmap(pixmap); PGraphicsPixmapItem * pixmapItem = new PGraphicsPixmapItem(pixmap);
this->addItem(pixmapItem);
pixmapItem->setShapeMode(QGraphicsPixmapItem::BoundingRectShape); pixmapItem->setShapeMode(QGraphicsPixmapItem::BoundingRectShape);
m_theThing = pixmapItem; m_theThing = pixmapItem;
this->setSceneRect(m_theThing->boundingRect()); this->setSceneRect(m_theThing->boundingRect());
@ -62,11 +95,12 @@ void GraphicsScene::showAnimated(const QString &filepath)
this->setSceneRect(m_theThing->boundingRect()); this->setSceneRect(m_theThing->boundingRect());
} }
bool GraphicsScene::trySetTransformationMode(Qt::TransformationMode mode) bool GraphicsScene::trySetTransformationMode(Qt::TransformationMode mode, float scaleHint)
{ {
QGraphicsPixmapItem * pixmapItem = qgraphicsitem_cast<QGraphicsPixmapItem *>(m_theThing); PGraphicsPixmapItem * pixmapItem = qgraphicsitem_cast<PGraphicsPixmapItem *>(m_theThing);
if (pixmapItem) { if (pixmapItem) {
pixmapItem->setTransformationMode(mode); pixmapItem->setTransformationMode(mode);
pixmapItem->setScaleHint(scaleHint);
return true; return true;
} }

2
app/graphicsscene.h
View File

@ -15,7 +15,7 @@ public:
void showSvg(const QString &filepath); void showSvg(const QString &filepath);
void showAnimated(const QString &filepath); void showAnimated(const QString &filepath);
bool trySetTransformationMode(Qt::TransformationMode mode); bool trySetTransformationMode(Qt::TransformationMode mode, float scaleHint);
QPixmap renderToPixmap(); QPixmap renderToPixmap();

4
app/graphicsview.cpp
View File

@ -392,8 +392,8 @@ void GraphicsView::setCheckerboardEnabled(bool enabled, bool invertColor)
void GraphicsView::applyTransformationModeByScaleFactor() void GraphicsView::applyTransformationModeByScaleFactor()
{ {
if (this->scaleFactor() < 1) { if (this->scaleFactor() < 1) {
scene()->trySetTransformationMode(Qt::SmoothTransformation); scene()->trySetTransformationMode(Qt::SmoothTransformation, this->scaleFactor());
} else { } else {
scene()->trySetTransformationMode(Qt::FastTransformation); scene()->trySetTransformationMode(Qt::FastTransformation, this->scaleFactor());
} }
} }