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我使用互联网上的示例在 wxpython 上为 Matplotlib-Basemap 编写了一个测试 python 程序。启动 GUI 时使用墨卡托投影绘制的地图。在选择各种单选按钮时，用户可以切换到所需的投影。我的问题是，连接到 matplotlib 的导航工具栏似乎仍然包含第一张图像的数据。再多的刷新、更新或实现都无法纠正这一点。当我按下缩放按钮时，第一张图像被缩放。当前图像未更新。欢迎任何帮助或建议。这是我的代码：

from numpy import arange, sin, pi
import matplotlib
from mpl_toolkits.basemap import Basemap
from wx._windows import StatusBar
matplotlib.use('WXAgg')

from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
from matplotlib.figure import Figure
from matplotlib.backends.backend_wxagg import NavigationToolbar2Wx as Toolbar

import wx



class BasemapPanel(wx.Panel):
def __init__(self, parent,projectionString):
    wx.Panel.__init__(self, parent)

    self.reDraw('merc',72.5,18.4)


def draw(self):
    t = arange(0.0, 3.0, 0.01)
    s = sin(2 * pi * t)
    self.axes.plot(t, s)

def reDraw(self,projectionString,testLon,testLat):

    self.figure = Figure(None,dpi=75)

    self.canvas = FigureCanvas(self, -1, self.figure)
    self.axes = self.figure.add_axes([0,0,1,1],frameon=False)
    self.toolbar = Toolbar(self.canvas)
    self.toolbar.Realize()


    sizer = wx.BoxSizer(wx.VERTICAL)
    sizer.Add(self.canvas, 1, wx.EXPAND|wx.ALL)

    sizer.Add(self.toolbar, 0 , flag=wx.EXPAND|wx.LEFT|wx.RIGHT|wx.TOP, border=10)
    self.SetSizer(sizer)
    self.canvas.Refresh(True)
    self.Layout()
    self.map = Basemap(llcrnrlon=-179, llcrnrlat=-80, urcrnrlon=179,
                       urcrnrlat=80, projection=projectionString, lat_1=18.2, lat_2=45,
                       lon_0=-95, resolution='c', area_thresh=10000,ax=self.axes)
    self.map.drawcoastlines()
    self.map.fillcontinents(color='coral',lake_color='aqua')
    self.map.drawmapboundary(fill_color='aqua')
    self.map.drawcountries()
    self.map.drawstates()

    lon, lat = testLon, testLat # Location 
    xpt,ypt = self.map(lon,lat)
    lonpt, latpt = self.map(xpt,ypt,inverse=True)
    self.map.plot(xpt,ypt,'bo')  # plot a blue dot there
    self.axes.text(xpt+100000,ypt+100000,'Location (%5.1f,%3.1f)' % (lonpt,latpt))
    self.toolbar.update()        




class MainPanel(wx.Panel):


def __init__(self, parent):
   wx.Panel.__init__(self, parent)

   font = wx.SystemSettings_GetFont(wx.SYS_SYSTEM_FONT)


   self.vbox = wx.BoxSizer(wx.VERTICAL)


   hbox2 = wx.BoxSizer(wx.HORIZONTAL)
            # Radio Boxes

   radioListOfProjections = ["merc" ,  "kav7" , "mbtfpq",
    "mill" , "robin",   
  "lcc" , "moll" , "eqdc"]
   self.rb = wx.RadioBox(self, label="Projection ", pos=(20, 210), choices=radioListOfProjections,  majorDimension=3,
                      style=wx.RA_SPECIFY_ROWS)
   self.Bind(wx.EVT_RADIOBOX, self.OnSelectingProjection, self.rb)
   hbox2.Add(self.rb)
   self.vbox.Add(hbox2,  proportion=1, flag=wx.LEFT|wx.RIGHT|wx.EXPAND, 
       border=10)
   self.vbox.Add((-1, 10))

   hbox3 = wx.BoxSizer(wx.HORIZONTAL)
   self.bmPanel = BasemapPanel(self,'merc')
   self.bmPanel.draw()
   self.bmPanel.SetSize((300,300))

   hbox3.Add(self.bmPanel, proportion=1, flag=wx.EXPAND)
   self.vbox.Add(hbox3, proportion=0, flag=wx.EXPAND|wx.ALL, 
         border=10)

   self.vbox.Add((-1, 35))
   self.SetSizer(self.vbox)       


def OnSelectingProjection(self, e):

    projectionString = self.rb.GetStringSelection()


    self.bmPanel.reDraw(projectionString,45.5,66.6)
    self.bmPanel.draw()

    hbox3 = wx.BoxSizer(wx.HORIZONTAL)

    hbox3.Add(self.bmPanel, proportion=1, flag=wx.EXPAND)

    self.vbox.Add(hbox3, proportion=0, flag=wx.EXPAND|wx.ALL, 
         border=10)

    self.vbox.Add((-1, 35))
    self.SetSizer(self.vbox) 


app = wx.App(False)
frame = wx.Frame(None)
panel = MainPanel(frame)
frame.Size = (650, 700)

frame.Move((400, 250))
frame.Center()
frame.Show()
app.MainLoop()
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1 回答 1

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解决了。这是一个小错误。我必须将轴上的图形设置为第一个绘制的图形。

我必须在 reDraw 方法中将 matplotlib.pyplot 作为 plt 导入，而不是设置 self.figure = Figure(None)

set self.figure(num=1) # 数字自增。

这会将新图像添加到轴上。因此要清除旧图像，在调用reDraw方法设置新投影之前，将图形清除为figure.clf()。

于 2013-06-20T07:11:25.740 回答