GridScene.py 文件源码

def draw_frequency_marker(self, x_pos, frequency):
        if frequency is None:
            self.clear_frequency_marker()
            return

        y1 = self.sceneRect().y()
        y2 = self.sceneRect().y() + self.sceneRect().height()

        if self.frequency_marker is None:
            pen = QPen(constants.LINECOLOR, Qt.FlatCap)
            self.frequency_marker = [None, None]
            self.frequency_marker[0] = self.addLine(x_pos, y1, x_pos, y2, pen)
            self.frequency_marker[1] = self.addSimpleText("")
            self.frequency_marker[1].setBrush(QBrush(constants.LINECOLOR))
            font = QFont()
            font.setBold(True)
            font.setPointSize(int(font.pointSize() * 1.25)+1)
            self.frequency_marker[1].setFont(font)

        self.frequency_marker[0].setLine(x_pos, y1, x_pos, y2)
        scale_x, scale_y = self.__calc_x_y_scale(self.sceneRect())
        self.frequency_marker[1].setTransform(QTransform.fromScale(scale_x, scale_y), False)
        self.frequency_marker[1].setText("Tune to " + Formatter.big_value_with_suffix(frequency, decimals=3))
        font_metric = QFontMetrics(self.frequency_marker[1].font())
        text_width = font_metric.width("Tune to") * scale_x
        text_width += (font_metric.width(" ") * scale_x) / 2
        self.frequency_marker[1].setPos(x_pos-text_width, 0.95*y1)