radar.py 文件源码

def draw_radar(self):
        """
        Discards the current content and redraws all elements on the graphic scene.
        """

        # decide which color to use
        bg_color, line_color = Qt.black, Qt.green

        self.scene.clear()
        self.scene.addRect(0, 0, self.width(), self.height(), brush=QBrush(bg_color))
        self._add_crosshair()
        self._add_circles(self.circle_count, self.add_text_labels)

        # for each measurement, draw a line
        for measurement in self.measurements:
            assert isinstance(measurement, Measurement)
            added_time = self.added_time[measurement]
            self._add_measurement(measurement.distance, measurement.angle, added_time)

        # for the latest 2 measurements, draw an angle visualizer
        for measurement in self.measurements[-2:]:
            self._add_latest_input_line(measurement.angle)