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网站栏目建设图,php怎么做p2p网站,在那个网站可买做鞋子的羊毛,永兴网站建设简介 /* * 图片展示控件 * Graphics View Framework的使用Demo * QGraphicsView、QGraphicsScene、QGraphicsItem的使用Demo * 支持图片的旋转与缩放#xff0c;自动缩放至接触边框 / 效果展示 坐标系示意图 Graphics View Framework的使用需要特别注意QGraphicsView、…简介 /  * 图片展示控件  * Graphics View Framework的使用Demo  * QGraphicsView、QGraphicsScene、QGraphicsItem的使用Demo  * 支持图片的旋转与缩放自动缩放至接触边框 / 效果展示 坐标系示意图 Graphics View Framework的使用需要特别注意QGraphicsView、QGraphicsScene、QGraphicsItem的坐标系及其转换方法下图为本程序的示意图。 黑色表示视图View的坐标系 蓝色表示场景scene的坐标系 紫色表示图元Item的坐标系 源码 pictureDisplayWidget.h /** 图片展示控件 Graphics View Framework的使用Demo* QGraphicsView、QGraphicsScene、QGraphicsItem的使用Demo* 支持图片的旋转与缩放自动缩放至接触边框 */#pragma once #include QWidgetclass QGraphicsScene; class QGraphicsView; class QGraphicsTextItem; class QGraphicsPixmapItem; class QGraphicsRectItem; class QGraphicsLineItem; class QSlider; class QPushButton; class PictureDisplayWidget : public QWidget {Q_OBJECTpublic:explicit PictureDisplayWidget(QWidget parent nullptr);~PictureDisplayWidget();public slots:void slot_SliderValueChanged(int value);void slot_btnClicked(bool checked false);private:void showInfo();void setImage(const QString strImagesPath);void shrinkImageSizeToInsideFramRect(const std::functionvoid (void) op);void enlargeImageSizeToInsideFramRect();private:QGraphicsView m_view;QGraphicsScene* m_scene;QGraphicsTextItem* m_infoTextItem;QGraphicsRectItem* m_framRectItem;QListQGraphicsLineItem* m_framLineList;QGraphicsPixmapItem* m_pixmapItem;QSlider* m_rotateSlider;QSlider* m_imageSizeSlider;QPushButton* m_btn1;QPushButton* m_btn2;QPushButton* m_btn3;QPushButton* m_btn4; };pictureDisplayWidget.cpp #include pictureDisplayWidget.h #include QGraphicsItem #include QGraphicsScene #include QGraphicsView #include QSlider #include QDebug #include QScrollBar #include QPushButton #include QVBoxLayoutstatic qreal sliderValueToPixmapScale(int value) {return value*0.02; } static int pixmapScaleToSliderValue(qreal scale) {return scale/0.02; }PictureDisplayWidget::PictureDisplayWidget(QWidget parent): QWidget(parent) {setWindowTitle(Graphics View Framework的使用Demo);QVBoxLayout verticalLayout new QVBoxLayout(this);//创建场景m_scene new QGraphicsScene;QRectF sceneRect(-200, -200, 400, 400);m_scene-setSceneRect(sceneRect); //设置view显示的场景框//添加左上角文本图元m_infoTextItem m_scene-addText(, QFont(Times, 12, QFont::Bold));m_infoTextItem-setDefaultTextColor(Qt::yellow);m_infoTextItem-setPos(-200, -200); //设置文本图元位于场景框左上角该坐标是场景坐标系的坐标m_infoTextItem-setZValue(5); //设置z轴值使得图元在最上层//添加场景矩形边框图元用于图片缩小时的碰撞检测m_framRectItem m_scene-addRect(sceneRect, QPen(Qt::red, 1));//添加场景矩形边框的四条边线图元用于图片放大时的碰撞检测QPen framLinePen(Qt::blue, 1);//int gap 1;//QRectF framLineRect sceneRect.adjusted(gap, gap, -gap, -gap);QRectF framLineRect(sceneRect);m_framLineList.append(m_scene-addLine(QLineF(framLineRect.topLeft(), framLineRect.topRight()), framLinePen));m_framLineList.append(m_scene-addLine(QLineF(framLineRect.topRight(), framLineRect.bottomRight()), framLinePen));m_framLineList.append(m_scene-addLine(QLineF(framLineRect.bottomRight(), framLineRect.bottomLeft()), framLinePen));m_framLineList.append(m_scene-addLine(QLineF(framLineRect.bottomLeft(), framLineRect.topLeft()), framLinePen));//添加图片图元m_pixmapItem m_scene-addPixmap(QPixmap());//创建视图m_view new QGraphicsView(m_scene, this);m_view-setMinimumSize(m_scene-sceneRect().width() m_view-verticalScrollBar()-width(),m_scene-sceneRect().height() m_view-horizontalScrollBar()-height());m_view-setBackgroundBrush(QBrush(Qt::gray));m_view-show();verticalLayout-addWidget(m_view);//添加图片旋转角度条m_rotateSlider new QSlider(Qt::Horizontal, this);m_rotateSlider-setTickInterval(1);m_rotateSlider-setMinimum(0);m_rotateSlider-setMaximum(360);m_rotateSlider-setTickPosition(QSlider::TicksBelow);verticalLayout-addWidget(m_rotateSlider);connect(m_rotateSlider, QSlider::valueChanged, this, PictureDisplayWidget::slot_SliderValueChanged);//添加图片缩放条m_imageSizeSlider new QSlider(Qt::Horizontal, this);//m_imageSizeSlider-setTickInterval(1);m_imageSizeSlider-setMinimum(30);m_imageSizeSlider-setMaximum(70);m_imageSizeSlider-setValue(50);m_imageSizeSlider-setTickPosition(QSlider::TicksBelow);verticalLayout-addWidget(m_imageSizeSlider);connect(m_imageSizeSlider, QSlider::valueChanged, this, PictureDisplayWidget::slot_SliderValueChanged);//添加按钮m_btn1 new QPushButton(1, this);m_btn2 new QPushButton(2, this);m_btn3 new QPushButton(3, this);m_btn4 new QPushButton(4, this);verticalLayout-addWidget(m_btn1);verticalLayout-addWidget(m_btn2);verticalLayout-addWidget(m_btn3);verticalLayout-addWidget(m_btn4);connect(m_btn1, QPushButton::clicked, this, PictureDisplayWidget::slot_btnClicked);connect(m_btn2, QPushButton::clicked, this, PictureDisplayWidget::slot_btnClicked);connect(m_btn3, QPushButton::clicked, this, PictureDisplayWidget::slot_btnClicked);connect(m_btn4, QPushButton::clicked, this, PictureDisplayWidget::slot_btnClicked);//初始化setImage(:/images/1.png);showInfo();resize(700, 650); }PictureDisplayWidget::~PictureDisplayWidget() {}void PictureDisplayWidget::slot_btnClicked(bool checked) {Q_UNUSED(checked);QPushButton* sender static_castQPushButton(this-sender());QString strImagesPath(:/images/1.png);if (sender m_btn1){strImagesPath :/images/1.png;}else if (sender m_btn2){strImagesPath :/images/1.jpeg;}else if (sender m_btn3){strImagesPath :/images/1.jpg;}else if (sender m_btn4){m_rotateSlider-setValue(0);strImagesPath :/images/OIP-C.jfif;}setImage(strImagesPath); }void PictureDisplayWidget::setImage(const QString strImagesPath) {//修改图片大小使图片大小与场景边框尺寸一致m_pixmapItem-setPixmap(QPixmap(strImagesPath).scaled(m_scene-sceneRect().size().toSize(), Qt::KeepAspectRatio));//设置图元变换(旋转)的原点为图元边框的中心点m_pixmapItem-setTransformOriginPoint(m_pixmapItem-boundingRect().center());QPointF itemBoundingRectCenterPoint m_pixmapItem-boundingRect().center();qDebug() m_pixmapItem-boundingRect() itemBoundingRectCenterPoint; //返回的是图元坐标系坐标//以pixmapItem边界矩形左上角为(0,0)进行移动—关键m_pixmapItem-setPos(0-itemBoundingRectCenterPoint.x(), 0-itemBoundingRectCenterPoint.y());qDebug() pos: m_pixmapItem-pos();//返回的是父项坐标系坐标qDebug() scenePos: m_pixmapItem-scenePos();//返回的是场景坐标系坐标qDebug() sceneBoundingRectPathPoint: m_pixmapItem-mapToScene(m_pixmapItem-boundingRect());//返回的是场景坐标系坐标//缩小图元使其在场景边框内shrinkImageSizeToInsideFramRect({//qDebug() setImage–shrinkImageSizeToInsideFramRect;});//放大图元使其填满场景边框enlargeImageSizeToInsideFramRect(); }//超出边界矩形时自动缩小图片尺寸 void PictureDisplayWidget::shrinkImageSizeToInsideFramRect(const std::functionvoid (void) op) {if (m_imageSizeSlider){//不断缩小图元大小直至其完全包含在场景边框内int imageSizeSliderValue m_imageSizeSlider-value();while (!m_pixmapItem-collidesWithItem(m_framRectItem, Qt::ContainsItemShape)) //碰撞检测{m_imageSizeSlider-setValue(–imageSizeSliderValue);op();}} }//自动放大图片尺寸至触碰边界线 void PictureDisplayWidget::enlargeImageSizeToInsideFramRect() {// for (int i 0; i m_framLineList.size(); i) {// qDebug() ContainsItemShape i : m_pixmapItem-collidesWithItem(m_framLineList.at(i), Qt::ContainsItemShape);// qDebug() IntersectsItemShape i : m_pixmapItem-collidesWithItem(m_framLineList.at(i), Qt::IntersectsItemShape);// qDebug() ContainsItemBoundingRect i : m_pixmapItem-collidesWithItem(m_framLineList.at(i), Qt::ContainsItemBoundingRect);// qDebug() IntersectsItemBoundingRect i : m_pixmapItem-collidesWithItem(m_framLineList.at(i), Qt::IntersectsItemBoundingRect);// qDebug() ——————————–;// }if (m_imageSizeSlider){//不断放大图元直至其碰撞到任意一条边线或者达到最大缩放比int count 0;do{bool bCollidesLine false;foreach (auto framLine, m_framLineList){if (bCollidesLine m_pixmapItem-collidesWithItem(framLine, Qt::IntersectsItemShape)) //碰撞检测{break;}}if (bCollidesLine){break; //当图元碰撞到任意一条边线时退出}int imageSizeSliderValue m_imageSizeSlider-value();m_imageSizeSlider-setValue(imageSizeSliderValue); //不断放大图元if (m_imageSizeSlider-value() imageSizeSliderValue){break; //当图元放大无效时退出}} while (count m_imageSizeSlider-maximum());} }void PictureDisplayWidget::slot_SliderValueChanged(int value) {QSlider sender static_castQSlider*(this-sender());if (sender m_rotateSlider){m_pixmapItem-setRotation(value);//旋转并检测当超出边界矩形时自动缩小图片尺寸shrinkImageSizeToInsideFramRect(std::bind(QGraphicsItem::setRotation, m_pixmapItem, value));//自动放大图片尺寸至触碰边界线enlargeImageSizeToInsideFramRect();}else if (sender m_imageSizeSlider){qreal oldScale m_pixmapItem-scale(); //记录原缩放比m_pixmapItem-setScale(sliderValueToPixmapScale(value)); //设置图元缩放比//当碰撞检测到pixmapItem不完全在边界矩形内时恢复原缩放比if (!m_pixmapItem-collidesWithItem(m_framRectItem, Qt::ContainsItemShape)){m_pixmapItem-setScale(oldScale);m_imageSizeSlider-setValue(pixmapScaleToSliderValue(oldScale));}}showInfo(); }//左上角信息打印 void PictureDisplayWidget::showInfo() {QString infoText QString(rotate:%1\r\nimageSize:%2).arg(m_rotateSlider-value()).arg(m_imageSizeSlider-value());m_infoTextItem-setPlainText(infoText); }