def _paint_frame(self, event):
        if self.bgimage:
            pixmap = self._build_pixmap(self.bgimage)
            # Check we need to resize the bgimage
            if self.bgsize:
                bgsize = self.bgsize
                if self.bgsize == 'fit':
                    bgsize = self.size()
                pixmap = pixmap.scaled(bgsize, Qt.KeepAspectRatio, Qt.SmoothTransformation)
            # Calculate the x,y position
            x,y = self.bgpos
            if self.bgpos:
                if x == 'left': x = 0
                elif x == 'center': x = (self.width() / 2) - (pixmap.width() / 2)
                elif x == 'right': x = self.width() - pixmap.width()
                if y == 'top': y = 0
                elif y == 'center': y = (self.height() / 2) - (pixmap.height() / 2)
                elif y == 'bottom': y = self.height() - pixmap.height()
            # Draw the pixmap
            painter = QtGui.QPainter(self)
            painter.setOpacity(self.bgopacity)
            painter.drawPixmap(int(x), int(y), pixmap) 

def set_status(self, raw, exist=None):
        item = QLabel()
        item.setAlignment(Qt.AlignCenter)

        if exist is 0:
            icon = QPixmap(QUEUE_ICON).scaled(20, 20, Qt.KeepAspectRatio,
                                              Qt.SmoothTransformation)
            item.setPixmap(icon)
            item.setToolTip('Waiting in the download queue...')

        if exist is 1:
            icon = QPixmap(CHECK_ICON).scaled(20, 20, Qt.KeepAspectRatio,
                                              Qt.SmoothTransformation)
            item.setPixmap(icon)
            item.setToolTip('All the features are downloaded...')

        if exist is 2:
            item = QPushButton(self)
            item.setToolTip('Download')
            item.setIcon(QIcon(DOWNLOAD_ICON))
            item.clicked.connect(self.download_clicked)

        self.setCellWidget(raw, 0, item) 

def __init__(self,parent="None",title="None",description="None",url="None",urlImage="None"):
        super(Tiles,self).__init__()
        #Heading Widget
        self.heading = QLabel('<b>%s</b>'%title)
        #SubHeading Widget with link to open in browser
        self.subHeading = QLabel('{}<a href="{}">...more</a>'.format(description,url))
        self.subHeading.setOpenExternalLinks(True)
        #Image Widget with article
        try:
            data = urllib.request.urlopen(urlImage).read()
        except:
            data = urllib.request.urlopen("https://ibb.co/XY30sjs").read()
        self.image = QImage()
        self.image.loadFromData(data)
        self.imageLabel = QLabel("image")
        self.imageLabel.setPixmap(QPixmap(self.image).scaled(64,64,Qt.KeepAspectRatio))
        self.tileLayout = QGridLayout()
        self.tileLayout.addWidget(self.heading,1,0)
        self.tileLayout.addWidget(self.imageLabel,1,1)
        self.tileLayout.addWidget(self.subHeading,2,0) 

def paintEvent(self, event):
        ancho, altura = self.width(), self.height()
        icono = self.icono.scaled(ancho, altura, Qt.KeepAspectRatio, Qt.SmoothTransformation)

        pintor = QPainter()
        
        pintor.begin(self)
        pintor.setRenderHint(QPainter.Antialiasing, True)
        pintor.setPen(Qt.NoPen)
        pintor.drawPixmap(0, 0, icono, 0, 0, 0, 0)
        pintor.setPen(Qt.white)
        pintor.drawText(event.rect(), Qt.AlignCenter, self.etiqueta)
        pintor.setPen(Qt.NoPen)
        pintor.setBrush(self.opacidad)
        pintor.drawEllipse(0, 0, ancho, altura)
        pintor.end()

        self.setMask(icono.mask()) 

def initUI(self):
        label = QLabel(self)
        label.setPixmap(QPixmap("Imagenes/siacle.jpg").scaled(450, 450, Qt.KeepAspectRatio,
                                                              Qt.SmoothTransformation))
        label.move(0, 0)

        botonCerrar = QPushButton("Cerrar", self)
        botonCerrar.setFixedSize(430, 32)
        botonCerrar.move(10, 457)

      # ========================= EVENTO =========================

        botonCerrar.clicked.connect(self.close)


# ========================= CLASE Acerca =========================== 

def initUI(self):
        label = QLabel(self)
        label.setPixmap(QPixmap("Imagenes/siacle.jpg").scaled(450, 450, Qt.KeepAspectRatio,
                                                              Qt.SmoothTransformation))
        label.move(0, 0)

        labelAcerca = QLabel("SIACLE: sistema para administrar clientes, diseñado y\n"
                             "desarrollado por ANDRES NIÑO con fines educativos.", self)
        labelAcerca.move(10, 460)

        botonCerrar = QPushButton("Cerrar", self)
        botonCerrar.setFixedSize(80, 32)
        botonCerrar.move(360, 457)

      # ========================= EVENTO =========================

        botonCerrar.clicked.connect(self.close)


# ========================= CLASE Siacle =========================== 

def initUI(self):

      # ==================== WIDGET QLABEL =======================
        
        self.labelImagen = QLabelClickable(self)
        self.labelImagen.setGeometry(15, 15, 118, 130)
        self.labelImagen.setToolTip("Imagen")
        self.labelImagen.setCursor(Qt.PointingHandCursor)

        self.labelImagen.setStyleSheet("QLabel {background-color: white; border: 1px solid "
                                       "#01DFD7; border-radius: 5px;}")

        self.pixmapImagen = QPixmap("Qt.png").scaled(112, 128, Qt.KeepAspectRatio,
                                                     Qt.SmoothTransformation)
        self.labelImagen.setPixmap(self.pixmapImagen)
        self.labelImagen.setAlignment(Qt.AlignCenter)

      # ===================== EVENTO QLABEL ======================

      # Llamar función al hacer clic o doble clic sobre el label
        self.labelImagen.clicked.connect(self.Clic)

  # ======================= FUNCIONES ============================ 

def _fit_in_view(view, rect, flags=Qt.IgnoreAspectRatio):
        if view.scene() is None or rect.isNull():
            return
        view.last_scene_roi = rect
        unity = view.transform().mapRect(QRectF(0, 0, 1, 1))
        view.scale(1 / unity.width(), 1 / unity.height())
        view_rect = view.viewport().rect()
        scene_rect = view.transform().mapRect(rect)
        xratio = view_rect.width() / scene_rect.width()
        yratio = view_rect.height() / scene_rect.height()
        if flags == Qt.KeepAspectRatio:
            xratio = yratio = min(xratio, yratio)
        elif flags == Qt.KeepAspectRatioByExpanding:
            xratio = yratio = max(xratio, yratio)
        view.scale(xratio, yratio)
        view.centerOn(rect.center())

    # name must match because we're overriding QMainWindow method 

def paint(self, painter, option, index):
        column = index.column()
        if column == 1:
            pixmap = None
            status = index.data(Qt.UserRole)
            if status == MagicFolderChecker.LOADING:
                self.waiting_movie.setPaused(False)
                pixmap = self.waiting_movie.currentPixmap().scaled(
                    20, 20, Qt.KeepAspectRatio, Qt.SmoothTransformation
                )
            elif status in (
                MagicFolderChecker.SYNCING,
                MagicFolderChecker.SCANNING,
            ):
                self.sync_movie.setPaused(False)
                pixmap = self.sync_movie.currentPixmap().scaled(
                    20, 20, Qt.KeepAspectRatio, Qt.SmoothTransformation
                )
            if pixmap:
                point = option.rect.topLeft()
                painter.drawPixmap(QPoint(point.x(), point.y() + 5), pixmap)
                option.rect = option.rect.translated(pixmap.width(), 0)
        super(Delegate, self).paint(painter, option, index) 

def updateImage(self, opencv_rgb_image):

        self.cv_img_rgb = opencv_rgb_image

        height, width, channel = self.cv_img_rgb.shape
        bytesPerLine = 3 * width
        self.q_image = QImage(self.cv_img_rgb.data, width,
                              height, bytesPerLine, QImage.Format_RGB888)
        # self.QPixmap=QPixmap.fromImage(self.q_image)
        # scaredPixmap = self.QPixmap.scaled(self,self.frame_lbl.frameSize, aspectRatioMode=Qt.IgnoreAspectRatio)
        self.frame_lbl.setPixmap(QPixmap.fromImage(self.q_image).scaled(self.frame_lbl.size(), aspectRatioMode=Qt.KeepAspectRatio)) 

def reset_view(self):
        # The SceneRect controls how far you can pan, make it larger than
        # just the bounding box so middle-click panning works
        panning_rect = QRectF(self.scene_bounding_rect)
        panning_rect_center = panning_rect.center()
        panning_rect_size = max(panning_rect.width(), panning_rect.height())*3
        panning_rect.setSize(QSizeF(panning_rect_size, panning_rect_size))
        panning_rect.moveCenter(panning_rect_center)
        self.setSceneRect(panning_rect)
        self.fitInView(self.scene_bounding_rect, Qt.KeepAspectRatio)
        self.zoom_view(0.8)

        self.update_grid() 

def update_preview(self):
        if not self._preview_pixmap:
            return

        scaled = self._preview_pixmap.scaled(
            self._ui.lblPreview.width(),
            self._ui.lblPreview.height(),
            Qt.KeepAspectRatio,
            Qt.SmoothTransformation,
        )
        self._ui.lblPreview.setPixmap(scaled) 

def run(self):
        cap = cv2.VideoCapture(0)
        fps_update_cnt = 0
        fps_update_num = 10
        while True:
            display_time = time.time()
            ret, x_np = cap.read()
            x_np = cv2.cvtColor(x_np, cv2.COLOR_BGR2RGB)

            y_np, inference_time = self.transfer(x_np)

            x_qt = QImage(x_np.data, x_np.shape[1], x_np.shape[0], QImage.Format_RGB888)
            x_qt = QPixmap.fromImage(x_qt)
            x_qt = x_qt.scaled(self.video_width, self.video_height, Qt.KeepAspectRatio)

            y_qt = QImage(y_np.data, y_np.shape[1], y_np.shape[0], QImage.Format_RGB888)
            y_qt = QPixmap.fromImage(y_qt)
            y_qt = y_qt.scaled(self.video_width, self.video_height, Qt.KeepAspectRatio)

            self.change_pixmap_x.emit(x_qt)
            self.change_pixmap_y.emit(y_qt)

            fps_update_cnt = (fps_update_cnt + 1) % fps_update_num
            if fps_update_cnt == 0:
                self.change_pixmap_inf.emit('    Infrence FPS: {0:.2f}'.format(
                    1 / inference_time if inference_time is not None else 0))
                display_time = time.time() - display_time
                self.change_pixmap_dis.emit('    Display FPS: {0:.2f}'.format(1 / display_time)) 

def _draw_pixmap(self, source, selected, synced):
        color = QColor(0x33, 0x33, 0x33) if selected else QColor(0x99, 0x99, 0x99)
        p = Pixmap(source)
        if p.isNull():
            return
        p = Pixmap(p.scaled(120, 120, Qt.KeepAspectRatio))
        p.replace_color(QColor(0, 0, 0), color)
        painter = QPainter(p)
        if synced:
            painter.drawPixmap(p.width() - 90, 0, 100, 100, IconTableItem.SYNCED_ICON)
        else:
            painter.drawPixmap(p.width() - 90, 0, 100, 100, IconTableItem.UNSYNCED_ICON)
        painter.end()
        return p 

def seleccionarImagen(self):
        imagen, extension = QFileDialog.getOpenFileName(self, "Seleccionar imagen", getcwd(),
                                                        "Archivos de imagen (*.png *.jpg)",
                                                        options=QFileDialog.Options())
          
        if imagen:
            # Adaptar imagen
            pixmapImagen = QPixmap(imagen).scaled(166, 178, Qt.KeepAspectRatio,
                                                  Qt.SmoothTransformation)

            # Mostrar imagen
            self.labelImagen.setPixmap(pixmapImagen) 

def initUI(self):

      # ===================== WIDGET QLABEL ======================

        label = QLabel(self)
        label.setGeometry(20, 20, 100, 100)
        label.setPixmap(QPixmap(":imagenes/Python.png").scaled(100, 100, Qt.KeepAspectRatio,
                                                               Qt.SmoothTransformation))


# ================================================================ 

def seleccionarImagen(self):
        imagen, extension = QFileDialog.getOpenFileName(self, "Seleccionar imagen", getcwd(),
                                                        "Archivos de imagen (*.png *.jpg)",
                                                        options=QFileDialog.Options())
          
        if imagen:
            # Adaptar imagen
            pixmapImagen = QPixmap(imagen).scaled(112, 128, Qt.KeepAspectRatio,
                                                  Qt.SmoothTransformation)

            # Mostrar imagen
            self.labelImagen.setPixmap(pixmapImagen)


# ================================================================ 

def seleccionarImagen(self):
        imagen, extension = QFileDialog.getOpenFileName(self, "Seleccionar imagen", getcwd(),
                                                        "Archivos de imagen (*.png *.jpg)",
                                                        options=QFileDialog.Options())
          
        if imagen:
            # Adaptar imagen
            pixmapImagen = QPixmap(imagen).scaled(166, 178, Qt.KeepAspectRatio,
                                                  Qt.SmoothTransformation)

            # Mostrar imagen
            self.labelImagen.setPixmap(pixmapImagen) 

def show_exp_pix(self):
        if self.src_pix.width() > 0:
            w = self.SrcImgShowLabel.width()
            h = self.SrcImgShowLabel.height()
            self.SrcImgShowLabel.setPixmap(self.src_pix.scaled(w, h, Qt.KeepAspectRatio))
        if self.dst_pix.width() > 0:
            w = self.DstImgShowLabel.width()
            h = self.DstImgShowLabel.height()
            self.DstImgShowLabel.setPixmap(self.dst_pix.scaled(w, h, Qt.KeepAspectRatio))

    # 窗口大小变化，使显示内容适应窗口大小 

def __init__(self):
        QGraphicsView.__init__(self)

        # Image is displayed as a QPixmap in a QGraphicsScene attached to this QGraphicsView.
        self.scene = QGraphicsScene()
        self.setScene(self.scene)

        # Store a local handle to the scene's current image pixmap.
        self._pixmapHandle = None

        # Image aspect ratio mode.
        # !!! ONLY applies to full image. Aspect ratio is always ignored when zooming.
        #   Qt.IgnoreAspectRatio: Scale image to fit viewport.
        #   Qt.KeepAspectRatio: Scale image to fit inside viewport, preserving aspect ratio.
        #   Qt.KeepAspectRatioByExpanding: Scale image to fill the viewport, preserving aspect ratio.
        self.aspectRatioMode = Qt.KeepAspectRatio

        # Scroll bar behaviour.
        #   Qt.ScrollBarAlwaysOff: Never shows a scroll bar.
        #   Qt.ScrollBarAlwaysOn: Always shows a scroll bar.
        #   Qt.ScrollBarAsNeeded: Shows a scroll bar only when zoomed.
        self.setHorizontalScrollBarPolicy(Qt.ScrollBarAsNeeded)
        self.setVerticalScrollBarPolicy(Qt.ScrollBarAsNeeded)

        # Stack of QRectF zoom boxes in scene coordinates.
        self.zoomStack = []

        # Flags for enabling/disabling mouse interaction.
        self.canZoom = True
        self.canPan = True 

def mousePressEvent(self, event):
        # retrieve the label 
        child = self.childAt(event.pos())
        
        if not child:
            return
        
        self.controller.mode = 'selection'
        # update the creation mode to the appropriate subtype
        self.controller.creation_mode = child.subtype
        
        pixmap = QPixmap(child.pixmap().scaled(
                                            QSize(50, 50), 
                                            Qt.KeepAspectRatio,
                                            Qt.SmoothTransformation
                                            ))

        mime_data = QtCore.QMimeData()
        mime_data.setData('application/x-dnditemdata', QtCore.QByteArray())

        drag = QtGui.QDrag(self)
        drag.setMimeData(mime_data)
        drag.setPixmap(pixmap)
        drag.setHotSpot(event.pos() - child.pos() + QPoint(-3, -10))

        if drag.exec_(Qt.CopyAction | Qt.MoveAction, Qt.CopyAction) == Qt.MoveAction:
            child.close()
        else:
            child.show() 

def mousePressEvent(self, event):
        # retrieve the label 
        child = self.childAt(event.pos())
        
        if not child:
            return
        
        self.controller.mode = 'selection'
        # update the creation mode to the appropriate subtype
        self.controller.creation_mode = child.subtype
        
        pixmap = QPixmap(child.pixmap().scaled(
                                            QSize(50, 50), 
                                            Qt.KeepAspectRatio,
                                            Qt.SmoothTransformation
                                            ))

        mime_data = QtCore.QMimeData()
        mime_data.setData('application/x-dnditemdata', QtCore.QByteArray())

        drag = QtGui.QDrag(self)
        drag.setMimeData(mime_data)
        drag.setPixmap(pixmap)
        drag.setHotSpot(event.pos() - child.pos() + QPoint(-3, -10))

        if drag.exec_(Qt.CopyAction | Qt.MoveAction, Qt.CopyAction) == Qt.MoveAction:
            child.close()
        else:
            child.show() 

def mousePressEvent(self, event):
        # retrieve the label 
        child = self.childAt(event.pos())
        if not child:
            return
        
        self.controller.mode = 'selection'
        # update the creation mode to the appropriate subtype
        self.controller.creation_mode = child.subtype
        # we change the view if necessary:
        # if it is a site, we switch the site view
        # if it is anything else and we are in the site view, we switch 
        # to the network view
        if child.subtype == 'site':
            self.project.show_site_view()
        else:
            if self.project.view_type == 'site':
                self.project.show_network_view()
        
        pixmap = QPixmap(child.pixmap().scaled(
                                            QSize(50, 50), 
                                            Qt.KeepAspectRatio,
                                            Qt.SmoothTransformation
                                            ))

        mime_data = QtCore.QMimeData()
        mime_data.setData('application/x-dnditemdata', QtCore.QByteArray())

        drag = QtGui.QDrag(self)
        drag.setMimeData(mime_data)
        drag.setPixmap(pixmap)
        drag.setHotSpot(event.pos() - child.pos() + QPoint(-3, -10))

        if drag.exec_(Qt.CopyAction | Qt.MoveAction, Qt.CopyAction) == Qt.MoveAction:
            child.close()
        else:
            child.show() 

def _updateROI(self, roi):

        if self.frame_data is None or not self.worm_index_type:
            # no trajectories data presented, nothing to do here
            roi.wormCanvas.clear()
            return

        self.updateROIcomboBox(roi)

        # extract individual worm ROI
        good = self.frame_data[self.worm_index_type] == roi.worm_index
        row_data = self.frame_data.loc[good].squeeze()

        if row_data.size == 0 or \
        np.isnan(row_data['coord_x']) or \
        np.isnan(row_data['coord_y']):
            # invalid data nothing to do here
            roi.wormCanvas.clear()
            return

        worm_img, roi_corner = getWormROI(self.frame_img, 
                                        row_data['coord_x'], 
                                        row_data['coord_y'], 
                                        row_data['roi_size']
                                        )
        
        roi_ori_size = worm_img.shape
        worm_img = np.ascontiguousarray(worm_img)
        worm_qimg = self._convert2Qimg(worm_img)

        canvas_size = min(roi.wormCanvas.height(), roi.wormCanvas.width())
        worm_qimg = worm_qimg.scaled(
            canvas_size, canvas_size, Qt.KeepAspectRatio)

        worm_qimg = self.drawSkelResult(worm_img, worm_qimg, row_data, roi.isDrawSkel, roi_corner, read_center=False)
        
        pixmap = QPixmap.fromImage(worm_qimg)
        roi.wormCanvas.setPixmap(pixmap) 

def alterPixmap(self, pixmap=None):

        #placeholder element accesc this function
        if pixmap:
            self.pixmap = pixmap
        self.label.setStyleSheet('#label { background-color: #636363;\
                border: 3px solid #ff5900; border-radius: 20px; }')

        self.label.setPixmap(self.pixmap.scaled(160, 80, Qt.KeepAspectRatio)) 

def _update_view_with_image(view, image_array):
        image = cv2.cvtColor(image_array, cv2.COLOR_BGR2RGB)
        height, width, _ = image.shape
        bytes_per_line = 3 * width
        qimg = QImage(image.data, width, height, bytes_per_line, QImage.Format_RGB888)

        view.scene().items()[0].setPixmap(QPixmap.fromImage(qimg))
        PUBGISMainWindow._fit_in_view(view,
                                      view.scene().itemsBoundingRect(),
                                      flags=Qt.KeepAspectRatio) 

def rescale(self):
        self.scene.setSceneRect(self.scene.itemsBoundingRect())
        self.ui.tabCrossSection.fitInView(self.scene.sceneRect(), Qt.KeepAspectRatio) 

def __init__(self, resource_filename, size=None):
        super().__init__(resource(resource_filename))
        if size:
            self.swap(
                self.scaled(
                    size, size, Qt.KeepAspectRatio, Qt.SmoothTransformation
                )
            ) 

def set_icon(self, fname):
        # 打开 PDF
        doc = fitz.open(fname)
        # 加载封面
        page = doc.loadPage(0)
        # 生成封面图像
        cover = render_pdf_page(page)
        label = QLabel(self)
        label.resize(self.width, self.width * 4 // 3)
        # 设置图片自动填充 label
        label.setScaledContents(True)
        # 设置封面图片
        p = QPixmap(cover)
        p.scaled(self.width, self.width * 4 // 3, Qt.KeepAspectRatio)
        label.setPixmap(p)
        # 设置单元格元素为 label
        self.table.setCellWidget(self.x, self.y, label)
        # 删除 label 对象，防止后期无法即时刷新界面
        # 因为 label 的生存周期未结束
        del label
        # 设置当前行数与列数
        self.crow, self.ccol = self.x, self.y
        # 每 8 个元素换行
        if (not self.y % 7) and (self.y):
            self.x += 1
            self.y = 0
        else:
            self.y += 1