radar.py 文件源码

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

        width, height = 800, 800
        self.setGeometry(width, height, width, height)

        # configs, can be changed at runtime
        self.circle_line_color = Qt.gray
        self.crosshair_line_color = Qt.gray
        self.text_label_color = Qt.darkGreen
        self.measured_distances_color = Qt.green
        self.circle_count = 10
        self.dot_width = 10
        self.line_width = 1
        self.distance_measurement_angle = 15
        self.measurement_angle = 10  # degrees that one sensor covers
        self.fade_out_time = 4  # older measurements will fade out over this time
        self.add_text_labels = False

        # data
        self.measurements = []
        self.added_time = dict()  # measurement -> timestamp

        # drawing timer
        self.timer = QTimer()
        self.timer.setInterval(80)
        self.timer.timeout.connect(self.draw_radar)
        self.timer.start()

        # internal canvas setup
        self.layout = QHBoxLayout()
        self.setLayout(self.layout)
        self.scene = QGraphicsScene()
        self.scene.setSceneRect(0, 0, width, height)
        self.canvas = QGraphicsView()
        self.canvas.setRenderHint(QPainter.Antialiasing)
        self.canvas.setFixedSize(width, height)
        self.canvas.setAlignment(Qt.AlignLeft)
        self.canvas.setScene(self.scene)
        self.canvas.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.canvas.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.layout.addWidget(self.canvas)

        # initial rendering
        self.draw_radar()