138 lines
3.9 KiB
C++
138 lines
3.9 KiB
C++
// SPDX-FileCopyrightText: 2022 Gary Wang <wzc782970009@gmail.com>
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//
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// SPDX-License-Identifier: MIT
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#include "graphicsscene.h"
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#include <QGraphicsSceneMouseEvent>
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#include <QMimeData>
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#include <QDebug>
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#include <QGraphicsItem>
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#include <QUrl>
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#include <QGraphicsSvgItem>
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#include <QMovie>
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#include <QLabel>
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#include <QPainter>
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class PGraphicsPixmapItem : public QGraphicsPixmapItem
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{
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public:
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PGraphicsPixmapItem(const QPixmap &pixmap, QGraphicsItem *parent = nullptr)
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: QGraphicsPixmapItem(pixmap, parent)
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{}
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void setScaleHint(float scaleHint) {
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m_scaleHint = scaleHint;
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}
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const QPixmap & scaledPixmap(float scaleHint) {
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if (qFuzzyCompare(scaleHint, m_cachedScaleHint)) return m_cachedPixmap;
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QSizeF resizedScale(boundingRect().size());
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resizedScale *= scaleHint;
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QPixmap && sourcePixmap = pixmap();
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m_cachedPixmap = sourcePixmap.scaled(
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resizedScale.toSize() * sourcePixmap.devicePixelRatioF(),
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Qt::KeepAspectRatio,
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Qt::SmoothTransformation);
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m_cachedScaleHint = scaleHint;
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return m_cachedPixmap;
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}
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void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
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QWidget *widget) override
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{
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if (transformationMode() == Qt::FastTransformation) {
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return QGraphicsPixmapItem::paint(painter, option, widget);
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} else {
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// painter->setRenderHints(QPainter::Antialiasing);
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painter->drawPixmap(QRectF(offset(), boundingRect().size()).toRect(),
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scaledPixmap(m_scaleHint));
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}
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}
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private:
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float m_scaleHint = 1;
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float m_cachedScaleHint = -1;
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QPixmap m_cachedPixmap;
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};
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GraphicsScene::GraphicsScene(QObject *parent)
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: QGraphicsScene(parent)
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{
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showText(tr("Drag image here"));
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}
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GraphicsScene::~GraphicsScene()
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{
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}
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void GraphicsScene::showImage(const QPixmap &pixmap)
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{
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this->clear();
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PGraphicsPixmapItem * pixmapItem = new PGraphicsPixmapItem(pixmap);
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this->addItem(pixmapItem);
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pixmapItem->setShapeMode(QGraphicsPixmapItem::BoundingRectShape);
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m_theThing = pixmapItem;
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this->setSceneRect(m_theThing->boundingRect());
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}
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void GraphicsScene::showText(const QString &text)
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{
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this->clear();
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QGraphicsTextItem * textItem = this->addText(text);
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textItem->setDefaultTextColor(QColor("White"));
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m_theThing = textItem;
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this->setSceneRect(m_theThing->boundingRect());
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}
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void GraphicsScene::showSvg(const QString &filepath)
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{
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this->clear();
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QGraphicsSvgItem * svgItem = new QGraphicsSvgItem(filepath);
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this->addItem(svgItem);
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m_theThing = svgItem;
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this->setSceneRect(m_theThing->boundingRect());
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}
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void GraphicsScene::showAnimated(const QString &filepath)
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{
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this->clear();
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QLabel * label = new QLabel;
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QMovie * movie = new QMovie(filepath, QByteArray(), label);
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label->setStyleSheet("background-color:rgba(225,255,255,0);");
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label->setMovie(movie);
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this->addWidget(label);
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movie->start();
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m_theThing = this->addRect(QRect(QPoint(0, 0), label->sizeHint()),
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QPen(Qt::transparent));
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this->setSceneRect(m_theThing->boundingRect());
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}
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bool GraphicsScene::trySetTransformationMode(Qt::TransformationMode mode, float scaleHint)
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{
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PGraphicsPixmapItem * pixmapItem = qgraphicsitem_cast<PGraphicsPixmapItem *>(m_theThing);
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if (pixmapItem) {
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pixmapItem->setTransformationMode(mode);
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pixmapItem->setScaleHint(scaleHint);
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return true;
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}
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return false;
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}
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QPixmap GraphicsScene::renderToPixmap()
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{
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PGraphicsPixmapItem * pixmapItem = qgraphicsitem_cast<PGraphicsPixmapItem *>(m_theThing);
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if (pixmapItem) {
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return pixmapItem->pixmap();
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}
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QPixmap pixmap(sceneRect().toRect().size());
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pixmap.fill(Qt::transparent);
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QPainter p(&pixmap);
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render(&p, sceneRect());
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return pixmap;
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}
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