Question

I am plotting things using matplotlib and Basemap (within a wxpython gui). Currently, my plot code look something like this:

self.map = Basemap(llcrnrlon=lon_L, llcrnrlat=lat_D, urcrnrlon=lon_R,
                               urcrnrlat=lat_U, projection='lcc', lat_0=map_lat1, lon_0=map_lon1, 
                               resolution='i', area_thresh=10000,ax=self.axes, fix_aspect=False) 

 m = Basemap(llcrnrlon=lon_L, llcrnrlat=lat_D, urcrnrlon=lon_R,
                        urcrnrlat=lat_U, projection='lcc', lat_0=map_lat1, lon_0=map_lon1, 
                        resolution='i', area_thresh=10000,ax=self.axes)

x,y=m(some_x_data,some_y_data)
plot_handle, = self.map.plot(x,y,'bo')
plot_handle.set_xdata(x)
plot_handle.set_ydata(y)

self.figure.canvas.draw()

This plots it just fine. Now what I want to do is take a single point (single x and single y within my data) and color it a different color. I still want to use the plot_handle because I am constantly updating the map/plot — so i don’t want to just reset my data. Any help?

Thanks!

Answer 1

Do a new plot_handle for the specific plot with a different marker:

plot_handle1, = self.map.plot([x[i]], [y[i]], 'ro')

You’ll then have to update this every time you want to change that point’s position. It’s not possible to use only one plot_handle and have points showing with different markers.