Python PyQt5.QtGui.QPainter.Antialiasing() Examples

def paintEvent(self, event):
        painter = QPainter()
        painter.begin(self)
        painter.setRenderHint(QPainter.Antialiasing)
        painter.fillRect(event.rect(), QBrush(QColor(255, 255, 255, 200)))
        painter.setPen(QPen(Qt.NoPen))

        if self.lists is not None:
            path = os.path.abspath(os.path.dirname(__file__)) + '/static/'
            path += self.lists[self.list_index] + '.png'
            self.list_index += 1
            if self.list_index >= len(self.lists):
                self.list_index = 0
            image = QImage(path)
            rect_image = image.rect()
            rect_painter = event.rect()
            dx = (rect_painter.width() - rect_image.width()) / 2.0
            dy = (rect_painter.height() - rect_image.height()) / 2.0
            painter.drawImage(dx, dy, image)

        painter.end() 

def paintEvent(self, event):
        super(PercentProgressBar, self).paintEvent(event)
        width = self.width()
        height = self.height()
        side = min(width, height)

        painter = QPainter(self)
        # 反锯齿
        painter.setRenderHints(QPainter.Antialiasing |
                               QPainter.TextAntialiasing)
        # 坐标中心为中间点
        painter.translate(width / 2, height / 2)
        # 按照100x100缩放
        painter.scale(side / 100.0, side / 100.0)

        # 绘制中心园
        self._drawCircle(painter, 50)
        # 绘制圆弧
        self._drawArc(painter, 50 - self.BorderWidth / 2)
        # 绘制文字
        self._drawText(painter, 50) 

def paintEvent(self, event):
        super(MetroCircleProgress, self).paintEvent(event)
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)
        painter.fillRect(self.rect(), self.BackgroundColor)
        painter.setPen(Qt.NoPen)

        for item, _ in self._items:
            painter.save()
            color = self.Color.toRgb()
            color.setAlphaF(item.opacity)
            painter.setBrush(color)
            # 5<= radius <=10
            radius = qBound(self.Radius, self.Radius / 200 *
                            self.height(), 2 * self.Radius)
            diameter = 2 * radius
            painter.drawRoundedRect(
                QRectF(
                    item.x / 100 * self.width() - diameter,
                    (self.height() - radius) / 2,
                    diameter, diameter
                ), radius, radius)
            painter.restore() 

def paintEvent(self, event):
        super(CircleProgressBar, self).paintEvent(event)
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)
        painter.translate(self.width() / 2, self.height() / 2)
        side = min(self.width(), self.height())
        painter.scale(side / 100.0, side / 100.0)
        painter.rotate(self.angle)
        painter.save()
        painter.setPen(Qt.NoPen)
        color = self.Color.toRgb()
        for i in range(11):
            color.setAlphaF(1.0 * i / 10)
            painter.setBrush(color)
            painter.drawEllipse(30, -10, 20, 20)
            painter.rotate(36)
        painter.restore()
        self.angle += self.Delta if self.Clockwise else -self.Delta
        self.angle %= 360 

def __init__(self, *args, **kwargs):
        super(Window, self).__init__(*args, **kwargs)
        self.resize(400, 300)
        # 抗锯齿
        self.setRenderHint(QPainter.Antialiasing)

        # 图表
        chart = QChart()
        self.setChart(chart)
        # 设置标题
        chart.setTitle('Simple splinechart example')
        # 添加Series
        self.getSeries(chart)
        # 创建默认xy轴
        chart.createDefaultAxes()
        chart.legend().setVisible(False) 

def paintEvent(self, _):
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing, True)
        painter.setRenderHint(QPainter.HighQualityAntialiasing, True)
        painter.setRenderHint(QPainter.SmoothPixmapTransform, True)
        # 背景
        painter.fillRect(self.rect(), Qt.transparent)
        # 进度块
        ratio = (self.value() - self.minimum()) / \
            (self.maximum() - self.minimum())
        width = self.rect().width() * ratio
        if self.isError:
            color = QColor(self._failedColor or CLoadingBar.FailedColor)
        else:
            color = QColor(self._color or CLoadingBar.Color)
        color.setAlpha(self._alpha)
        painter.setBrush(color)
        painter.setPen(Qt.NoPen)
        painter.drawRoundedRect(QRectF(0, 0, width, self.height()), 2, 2) 

def __init__(self, *args, **kwargs):
        super(ChartView, self).__init__(*args, **kwargs)
        self.resize(800, 600)
        self.setRenderHint(QPainter.Antialiasing)  # 抗锯齿
        # 自定义x轴label
        self.category = ["周一", "周二", "周三", "周四", "周五", "周六", "周日"]
        self.initChart()

        # 提示widget
        self.toolTipWidget = GraphicsProxyWidget(self._chart)

        # line
        self.lineItem = QGraphicsLineItem(self._chart)
        pen = QPen(Qt.gray)
        pen.setWidth(1)
        self.lineItem.setPen(pen)
        self.lineItem.setZValue(998)
        self.lineItem.hide()

        # 一些固定计算，减少mouseMoveEvent中的计算量
        # 获取x和y轴的最小最大值
        axisX, axisY = self._chart.axisX(), self._chart.axisY()
        self.min_x, self.max_x = axisX.min(), axisX.max()
        self.min_y, self.max_y = axisY.min(), axisY.max() 

def __analysis(self, datas):
        '''
        analysis json data
        :param datas: json data
        '''
        # 标题
        self.__setTitle(datas.get("title", None))
        # 抗锯齿
        if (datas.get("antialiasing", False) or False):
            self.setRenderHint(QPainter.Antialiasing)
        # 主题
        self._chart.setTheme(datas.get("theme", 0) or 0)
        # 动画
        self.__setAnimation(datas.get("animation", None))
        # 背景设置
        self.__setBackground(datas.get("background", None))
        # 边距设置
        self.__setMargins(datas.get("margins", None))
        # 设置图例
        self.__setLegend(datas.get("legend", None))
        # 设置series
        self.__setSeries(datas.get("series", None))
        # 自定义的x轴
        self.__setAxisX(datas.get("axisx", None))
        # 自定义的y轴 

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 __init__(self, *args, **kwargs):
        super(Window, self).__init__(*args, **kwargs)
        self.resize(400, 300)
        # 抗锯齿
        self.setRenderHint(QPainter.Antialiasing)
        # 生成模拟数据
        self.m_dataTable = self.generateRandomData(3, 10, 7)

        # 图表
        chart = QChart()
        self.setChart(chart)
        # 设置标题
        chart.setTitle('Scatter chart')
        # 添加Series
        self.getSeries(chart)
        # 创建默认xy轴
        chart.createDefaultAxes()
        chart.legend().setVisible(False) 

def paintEvent(self, event):

        painter = QPainter()
        painter.begin(self)
        painter.setRenderHint(QPainter.Antialiasing)
        painter.fillRect(event.rect(), QBrush(QColor(255,255, 255, 127)))
        painter.setPen(QPen(QtCore.Qt.NoPen))

        for i in range(6):
            if (self.counter / 5) % 6 == i:
                painter.setBrush(QBrush(QColor(127 + (self.counter % 5) * 32, 0, 0)))
            else:
                painter.setBrush(QBrush(QColor(0, 0, 0)))
            painter.drawEllipse(
                self.width() / 2 + 30 * math.cos(2 * math.pi * i / 6.0) - 10,
                self.height() / 2 + 30 * math.sin(2 * math.pi * i / 6.0) - 10,
                20, 20)

        painter.end() 

def paintEvent(self, event):  # noqa: N802
        """We override the painting event to draw the invite ourselves."""
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)

        rect = QRect(self.rect())

        # Draw the border
        painter.setBrush(QBrush(QColor(122, 122, 122)))
        painter.setPen(Qt.NoPen)
        painter.drawRect(rect)

        rect.setX(rect.x() + 1)
        rect.setY(rect.y() + 1)
        rect.setWidth(rect.width() - 1)
        rect.setHeight(rect.height() - 1)

        # Draw the background
        painter.setBrush(QBrush(QColor(255, 255, 225)))
        painter.setPen(Qt.NoPen)
        painter.drawRect(rect) 

def paintEvent(self, event):
        if not self.model().rowCount():
            self.show_drop_label()
            painter = QPainter(self.viewport())
            painter.setRenderHint(QPainter.Antialiasing)
            pen = QPen(QColor(128, 128, 128), 5)
            pen.setDashPattern([1, 2.91])
            painter.setPen(pen)
            geometry = self.geometry()
            painter.drawRect(
                geometry.x(),
                geometry.y() + self.dropzone_top_margin,
                geometry.width() - 24,
                geometry.height() - 24,
            )
        super().paintEvent(event) 

def text_mousePressEvent(self, e):
        if e.button() == Qt.LeftButton and self.current_pos is None:
            self.current_pos = e.pos()
            self.current_text = ""
            self.timer_event = self.text_timerEvent

        elif e.button() == Qt.LeftButton:

            self.timer_cleanup()
            # Draw the text to the image
            p = QPainter(self.pixmap())
            p.setRenderHints(QPainter.Antialiasing)
            font = build_font(self.config)
            p.setFont(font)
            pen = QPen(self.primary_color, 1, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin)
            p.setPen(pen)
            p.drawText(self.current_pos, self.current_text)
            self.update()

            self.reset_mode()

        elif e.button() == Qt.RightButton and self.current_pos:
            self.reset_mode() 

def paintEvent(self, event):
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)
        # 背景白色
        painter.fillRect(event.rect(), QBrush(Qt.white))
        # 绘制边缘虚线框
        painter.setPen(Qt.DashLine)
        painter.setBrush(Qt.NoBrush)
        painter.drawRect(self.rect())
        # 随机画条线
        for _ in range(3):
            painter.setPen(QPen(QTCOLORLIST[qrand() % 5], 1, Qt.SolidLine))
            painter.setBrush(Qt.NoBrush)
            painter.drawLine(QPoint(0, qrand() % self.height()),
                             QPoint(self.width(), qrand() % self.height()))
            painter.drawLine(QPoint(qrand() % self.width(), 0),
                             QPoint(qrand() % self.width(), self.height()))
        # 绘制噪点
        painter.setPen(Qt.DotLine)
        painter.setBrush(Qt.NoBrush)
        for _ in range(self.width()):  # 绘制噪点
            painter.drawPoint(QPointF(qrand() % self.width(), qrand() % self.height()))
        # super(WidgetCode, self).paintEvent(event)  # 绘制文字
        # 绘制跳动文字
        metrics = QFontMetrics(self.font())
        x = (self.width() - metrics.width(self.text())) / 2
        y = (self.height() + metrics.ascent() - metrics.descent()) / 2
        for i, ch in enumerate(self.text()):
            index = (self.step + i) % 16
            painter.setPen(TCOLORLIST[qrand() % 6])
            painter.drawText(x, y - ((SINETABLE[index] * metrics.height()) / 400), ch)
            x += metrics.width(ch) 

def __init__(self, *args, antialiasing=True, **kwargs):
        super(Label, self).__init__(*args, **kwargs)
        self.Antialiasing = antialiasing
        self.setMaximumSize(200, 200)
        self.setMinimumSize(200, 200)
        self.radius = 100

        #####################核心实现#########################
        self.target = QPixmap(self.size())  # 大小和控件一样
        self.target.fill(Qt.transparent)  # 填充背景为透明

        p = QPixmap("Data/Images/head.jpg").scaled(  # 加载图片并缩放和控件一样大
            200, 200, Qt.KeepAspectRatioByExpanding, Qt.SmoothTransformation)

        painter = QPainter(self.target)
        if self.Antialiasing:
            # 抗锯齿
            painter.setRenderHint(QPainter.Antialiasing, True)
            painter.setRenderHint(QPainter.HighQualityAntialiasing, True)
            painter.setRenderHint(QPainter.SmoothPixmapTransform, True)

        #         painter.setPen(# 测试圆圈
        #             QPen(Qt.red, 5, Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
        path = QPainterPath()
        path.addRoundedRect(
            0, 0, self.width(), self.height(), self.radius, self.radius)
        # **** 切割为圆形 ****#
        painter.setClipPath(path)
        #         painter.drawPath(path)  # 测试圆圈

        painter.drawPixmap(0, 0, p)
        self.setPixmap(self.target)
        #####################核心实现######################### 

def paintEvent(self, event):
        super(Label, self).paintEvent(event)
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)
        painter.setRenderHint(QPainter.SmoothPixmapTransform)
        try:
            self.image.SetImageSize(self.width(), self.height())
            self.image.Draw(painter, 0, 0)
        except Exception as e:
            print(e) 

def paintEvent(self, event):
        super(BubbleLabel, self).paintEvent(event)
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)  # 抗锯齿

        rectPath = QPainterPath()  # 圆角矩形
        triPath = QPainterPath()  # 底部三角形

        height = self.height() - 8  # 往上偏移8
        rectPath.addRoundedRect(QRectF(0, 0, self.width(), height), 5, 5)
        x = self.width() / 5 * 4
        triPath.moveTo(x, height)  # 移动到底部横线4/5处
        # 画三角形
        triPath.lineTo(x + 6, height + 8)
        triPath.lineTo(x + 12, height)

        rectPath.addPath(triPath)  # 添加三角形到之前的矩形上

        # 边框画笔
        painter.setPen(QPen(self.BorderColor, 1, Qt.SolidLine,
                            Qt.RoundCap, Qt.RoundJoin))
        # 背景画刷
        painter.setBrush(self.BackgroundColor)
        # 绘制形状
        painter.drawPath(rectPath)
        # 三角形底边绘制一条线保证颜色与背景一样
        painter.setPen(QPen(self.BackgroundColor, 1,
                            Qt.SolidLine, Qt.RoundCap, Qt.RoundJoin))
        painter.drawLine(x, height, x + 12, height) 

def __init__(self, *args, **kwargs):
        super(ChartView, self).__init__(*args, **kwargs)
        self.resize(800, 600)
        self.setRenderHint(QPainter.Antialiasing)  # 抗锯齿
        self.initChart()

        self.toolTipWidget = GraphicsProxyWidget(self._chart)

        # line
        self.lineItem = QGraphicsLineItem(self._chart)
        self.lineItem.setZValue(998)
        self.lineItem.hide()

        # 一些固定计算，减少mouseMoveEvent中的计算量
        # 获取x和y轴的最小最大值
        axisX, axisY = self._chart.axisX(), self._chart.axisY()
        self.min_x, self.max_x = axisX.min(), axisX.max()
        self.min_y, self.max_y = axisY.min(), axisY.max()
        # 坐标系中左上角顶点
        self.point_top = self._chart.mapToPosition(
            QPointF(self.min_x, self.max_y))
        # 坐标原点坐标
        self.point_bottom = self._chart.mapToPosition(
            QPointF(self.min_x, self.min_y))
        self.step_x = (self.max_x - self.min_x) / (axisX.tickCount() - 1)

    #         self.step_y = (self.max_y - self.min_y) / (axisY.tickCount() - 1) 

def paintEvent(self, event):
        super(SlippedImgWidget, self).paintEvent(event)
        # 绘制图形
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)
        # 左上角偏移5个像素画背景图片
        painter.drawPixmap(
            -5 + self._offsets[0],
            -5 + self._offsets[1], self.bgPixmap)
        # 右下角偏移5个像素画前景图片
        painter.drawPixmap(
            self.width() - self.pePixmap.width() + 5 - self._offsets[2],
            self.height() - self.pePixmap.height() + 5 - self._offsets[3],
            self.pePixmap
        ) 

def onScreenShot1(self):
        # 截图方式1
        page = self.webView.page()
        oldSize = self.webView.size()
        self.webView.resize(page.contentsSize().toSize())

        def doScreenShot():
            rect = self.webView.contentsRect()
            size = rect.size()
            image = QImage(size, QImage.Format_ARGB32_Premultiplied)
            image.fill(Qt.transparent)

            painter = QPainter()
            painter.begin(image)
            painter.setRenderHint(QPainter.Antialiasing, True)
            painter.setRenderHint(QPainter.TextAntialiasing, True)
            painter.setRenderHint(QPainter.SmoothPixmapTransform, True)

            self.webView.render(painter)
            painter.end()
            self.webView.resize(oldSize)

            # 添加到左侧list中
            item = QListWidgetItem(self.widgetRight)
            image = QPixmap.fromImage(image)
            item.setIcon(QIcon(image))
            item.setData(Qt.UserRole + 1, image)

        # 先等一下再截图吧
        QTimer.singleShot(2000, doScreenShot) 

def onScreenShot1(self):
        # 截图方式1
        page = self.webView.page()
        frame = page.mainFrame()
        size = frame.contentsSize()
        image = QImage(size, QImage.Format_ARGB32_Premultiplied)
        image.fill(Qt.transparent)

        painter = QPainter()
        painter.begin(image)
        painter.setRenderHint(QPainter.Antialiasing, True)
        painter.setRenderHint(QPainter.TextAntialiasing, True)
        painter.setRenderHint(QPainter.SmoothPixmapTransform, True)

        # 记录旧大小
        oldSize = page.viewportSize()
        # *****重点就是这里******
        page.setViewportSize(size)
        frame.render(painter)
        painter.end()

        # 截图完成后需要还原,否则界面不响应鼠标等
        page.setViewportSize(oldSize)

        # 添加到左侧list中
        item = QListWidgetItem(self.widgetRight)
        image = QPixmap.fromImage(image)
        item.setIcon(QIcon(image))
        item.setData(Qt.UserRole + 1, image) 

def __init__(self, lang, areaType, statusBar):
        QGraphicsView.__init__(self)

        self.ocrscene = OcrScene(self, lang, areaType)
        self.setScene(self.ocrscene)

        self.setCacheMode(QGraphicsView.CacheBackground)
        self.setRenderHint(QPainter.Antialiasing)
        self.setTransformationAnchor(QGraphicsView.AnchorUnderMouse)
        self.setResizeAnchor(QGraphicsView.AnchorViewCenter)

        self.setMinimumSize(200, 200)

        self.language = lang
        self.statusBar = statusBar
        self.areaType = areaType

        self.resizingArea = None
        self.resizingAreaPos = None
        self.resizingAreaRect = None
        self.resizingEdge = None
        self.resizingStartingPos = None
        self.areaBorder = float()
        self.areaTextSize = float()

        self.setCursor(Qt.CrossCursor)
        self.scene().isModified = False
        self.bResizing = False
        self.filename = None
        Image.init() 

def __init__(self, parent=None):
        super().__init__(parent)

        self.setResizeAnchor(QGraphicsView.NoAnchor)
        self.setTransformationAnchor(QGraphicsView.NoAnchor)
        self.setRenderHints(QPainter.Antialiasing)

        self.scene_manager = None  # type: SceneManager
        self.mouse_press_pos = None  # type: QPoint
        self.mouse_pos = None  # type: QPoint
        self.grab_start = None  # type: QPoint

        self.move_y_with_drag = False

        self.xmove = 0

        self.separation_area_moving = False

        self.shift_mode = False  # Shift Key currently pressed?

        self.select_all_action = QAction(self.tr("Select all"), self)
        self.select_all_action.setShortcut(QKeySequence.SelectAll)
        self.select_all_action.triggered.connect(self.select_all)
        self.select_all_action.setShortcutContext(Qt.WidgetWithChildrenShortcut)
        self.select_all_action.setIcon(QIcon.fromTheme("edit-select-all"))
        self.addAction(self.select_all_action) 

def paintEvent(self, event):
        super(CircleLineWindow, self).paintEvent(event)
        if not self._canDraw:
            return
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)
        painter.setRenderHint(QPainter.SmoothPixmapTransform)
        self.draw(painter) 

def __init__(self, *args, **kwargs):
        super(ChartView, self).__init__(*args, **kwargs)
        self.resize(800, 600)
        self.setRenderHint(QPainter.Antialiasing)  # 抗锯齿
        self.initChart()

        self.toolTipWidget = GraphicsProxyWidget(self._chart)

        # line
        self.lineItem = QGraphicsLineItem(self._chart)
        self.lineItem.setZValue(998)
        self.lineItem.hide()

        # 一些固定计算，减少mouseMoveEvent中的计算量
        # 获取x和y轴的最小最大值
        axisX, axisY = self._chart.axisX(), self._chart.axisY()
        self.min_x, self.max_x = axisX.min(), axisX.max()
        self.min_y, self.max_y = axisY.min(), axisY.max()
        # 坐标系中左上角顶点
        self.point_top = self._chart.mapToPosition(
            QPointF(self.min_x, self.max_y))
        # 坐标原点坐标
        self.point_bottom = self._chart.mapToPosition(
            QPointF(self.min_x, self.min_y))
        self.step_x = (self.max_x - self.min_x) / (axisX.tickCount() - 1)

    #         self.step_y = (self.max_y - self.min_y) / (axisY.tickCount() - 1) 

def __init__(self, *args, **kwargs):
        super(Window, self).__init__(*args, **kwargs)
        self.resize(400, 300)
        # 抗锯齿
        self.setRenderHint(QPainter.Antialiasing)

        # 图表
        chart = QChart()
        self.setChart(chart)
        # 设置标题
        chart.setTitle('Simple horizontal barchart example')
        # 开启动画效果
        chart.setAnimationOptions(QChart.SeriesAnimations)
        # 添加Series
        series = self.getSeries()
        chart.addSeries(series)
        # 分类
        categories = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun']
        # 分类x轴
        axis = QBarCategoryAxis()
        axis.append(categories)
        # 创建默认轴线
        chart.createDefaultAxes()
        # 替换默认y轴
        chart.setAxisY(axis, series)
        # 显示图例
        chart.legend().setVisible(True)
        chart.legend().setAlignment(Qt.AlignBottom) 

def __init__(self, *args, **kwargs):
        super(Window, self).__init__(*args, **kwargs)
        self.resize(400, 300)
        # 抗锯齿
        self.setRenderHint(QPainter.Antialiasing)

        # 图表
        chart = QChart()
        self.setChart(chart)
        # 设置标题
        chart.setTitle('Simple percentbarchart example')
        # 开启动画效果
        chart.setAnimationOptions(QChart.SeriesAnimations)
        # 添加Series
        series = self.getSeries()
        chart.addSeries(series)
        # 分类
        categories = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun']
        # 分类x轴
        axis = QBarCategoryAxis()
        axis.append(categories)
        # 创建默认轴线
        chart.createDefaultAxes()
        # 替换默认x轴
        chart.setAxisX(axis, series)
        # 显示图例
        chart.legend().setVisible(True)
        chart.legend().setAlignment(Qt.AlignBottom) 

def __init__(self, *args, **kwargs):
        super(Window, self).__init__(*args, **kwargs)
        self.resize(400, 300)
        # 抗锯齿
        self.setRenderHint(QPainter.Antialiasing)

        # 图表
        chart = QChart()
        self.setChart(chart)
        # 设置标题
        chart.setTitle('Simple piechart example')
        # 添加Series
        chart.addSeries(self.getSeries()) 

def __init__(self, pixmap, text, size=0.5, corner=BottomRight):
        super().__init__()

        base_pixmap = QPixmap(pixmap)
        base_size = base_pixmap.size()
        base_max = min(base_size.height(), base_size.width())
        if not base_max:
            # Because gridsync.gui.systray.animation.currentPixmap() returns
            # a blank pixmap when unpausing the animation for the first time.
            # Returning early to prevents QPainter from spewing warnings.
            self.swap(base_pixmap)
            return

        badge_max = base_max * size
        pen_width = badge_max * 0.05
        rect = QRect(
            base_max * max(corner[0] - size, 0) + pen_width,
            base_max * max(corner[1] - size, 0) + pen_width,
            badge_max - pen_width,
            badge_max - pen_width,
        )

        painter = QPainter(base_pixmap)
        painter.setRenderHint(QPainter.Antialiasing)
        painter.setPen(QPen(Qt.red, pen_width))
        painter.setBrush(QBrush(Qt.red))
        painter.drawEllipse(rect)

        if text:
            font = painter.font()
            font.setPixelSize(badge_max - pen_width)
            painter.setFont(font)
            painter.setPen(Qt.white)
            painter.drawText(rect, Qt.AlignCenter, str(text))

        painter.end()
        self.swap(base_pixmap)