On 6/29/10 1:19 PM, Thomas Lecocq wrote:
Hi,
What about ordering the arrays before plotting ? Are the first
elements drawn back to front ?
Thomas
**********************
Thomas Lecocq
Geologist
Ph.D.Student (Seismology)
Royal Observatory of Belgium
**********************
------------------------------------------------------------------------
Date: Mon, 28 Jun 2010 12:55:22 -0400
From: athak...@weatherinnovations.com
To: matplotlib-users@lists.sourceforge.net
Subject: [Matplotlib-users] zorder for individual points in a scatter
plot on a Basemap
Hi,
I'm currently using a scatter plot on a Basemap and I'd like to set
the zorder of the individual points based on their temperature. The
higher the temperature, the higher the zorder. Also, i'm using a
colorbar to set the colors for the plot. Here is a snippet of my code:
x = np.array(val)
fig.sca(ax1)
lon_0 =(urcrnrlon+llcrnrlon)/2
lat_0 =(urcrnrlat+llcrnrlat)/2
m =
Basemap(llcrnrlon=llcrnrlon,llcrnrlat=llcrnrlat,urcrnrlon=urcrnrlon,
urcrnrlat=urcrnrlat,resolution='i',projection='cyl',lon_0=lon_0,lat_0=lat_0)
m.drawcoastlines()
m.drawmapboundary()
m.drawparallels(np.arange(llcrnrlat-1,urcrnrlat+1,5.))
m.drawmeridians(np.arange(llcrnrlon-1,urcrnrlon+1,5.))
m.fillcontinents(color='white',lake_color='aqua')
m.drawcountries(linewidth=1)
lons,lats = m(lon,lat)
#I can do it this way, but this screws up the colorbar
#for i in range(len(x)):
#
m.scatter(lons[i],lats[i],c=x[i],marker='o',picker=5,zorder=x[i])
m.scatter(lons,lats,c=x,marker='o',picker=5)
plt.title('Time Range: %s to %s'%(startDay.strftime("%b-%d
%H:%M"),endDay.strftime("%b-%d %H:%M")))
plt.colorbar(shrink=0.5)
Is there anyway to set the zorder of the points without using the loop
in commented code? Any help would be greatly appreciated.
Thanks,
Aman: You can save the mappable from the scatter you want the colorbar
to represent, then pass that to colorbar. i.e.
im = m.scatter(lons,lats,c=x,marker='o',picker=5) # plot all the pts,
save mappable
# now do one at a time
for i in range(len(x)):
m.scatter(lons[i],lats[i],c=x[i],marker='o',picker=5,zorder=x[i])
plt.colorbar(im,shrink=0.5) # use mappable from 1st call to scatter for
colorbar
-Jeff
--
Jeffrey S. Whitaker Phone : (303)497-6313
Meteorologist FAX : (303)497-6449
NOAA/OAR/PSD R/PSD1 Email : jeffrey.s.whita...@noaa.gov
325 Broadway Office : Skaggs Research Cntr 1D-113
Boulder, CO, USA 80303-3328 Web : http://tinyurl.com/5telg
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