Question

我有一个回调函数设置，当你点击其中一个时，它会在地图上连接两个点。我的问题是我似乎无法删除连接它们的线。基本上，每次点击标记时都会调用以下函数。我需要它来删除旧的大圆并映射新的圆。相反，它只是继续创建新行而不是删除旧行。您可以忽略if语句，因为它们按预期工作。想法？

def mapPair(self,localLat,localLon,remoteLat, remoteLon):
    if self.connectingLine != None:
        self.connectingLine.remove() # <--doesn't work

    if localLat != "unknown" and self.currentLocalItem is None:
        self.currentLocalItem, = self.map.plot(localLon, localLat, 'bo', markersize=15, color='g', label="Local")
    elif localLat!= "unknown" and self.currentLocalItem is not None:
        self.currentLocalItem.set_ydata(localLat)
        self.currentLocalItem.set_xdata(localLon)

    self.connectingLine = self.map.drawgreatcircle(localLon, localLat, remoteLon, remoteLat, lw=3)

    self.fig.canvas.draw()

Answer 1

嗯，我不确定为什么会发生这种情况（或者如果它发生了），但是当我分配self.connectingLine时，我得到一个列表而不是一个对象。我不知道如何解决这个问题，所以这是我的工作

def mapPair(self,localLat,localLon,remoteLat, remoteLon):
    if self.connectingLine != None:
        for x in self.connectingLine:
            x.remove()

    if localLat != "unknown" and self.currentLocalItem is None:
        self.currentLocalItem, = self.map.plot(localLon, localLat, 'bo', markersize=15, color='g', label="Local")
    elif localLat!= "unknown" and self.currentLocalItem is not None:
        self.currentLocalItem.set_ydata(localLat)
        self.currentLocalItem.set_xdata(localLon)

    self.connectingLine = self.map.drawgreatcircle(localLon, localLat, remoteLon, remoteLat, lw=3)

Python Basemap删除大圆圈

1 个答案: