Re: [Matplotlib-users] Plotting points on images - axes problems

[Eric F. <ef...@ha...>]

Bob,

Try doing

b = axis()
ax1.plot([0.0],[0.0],'wo')
axis(b)

That saves the axis range set by imshow and restores it after the call 
to plot.

Eric

Robert Simpson wrote:
> Hi,
> 
> Using matplotlib 0.87.2, I've been trying to plot points on top of an 
> image.  The image without points fills axes of the extent requested, but 
> using plot to add a point on top of the image changes the axes lengths 
> and gives unwanted white margins around the edges.  Here's an example.  
> Any help would be greatly appreciated!
> 
> Bob Simpson
> 
> from pylab import *
> 
> # Sample image.
> image = rand(12,6)
> 
> # This choice for extent works fine... It produces no white margins.
> #extent = [-80, 60, -60, 40]
> 
> # This choice gives unwanted white margins,
> #   except when no point is plotted.
> extent = [-80.,64., -74.,48.]
> 
> ax1 = axes()
> ax1.im = imshow(image, origin='lower', extent=extent)
> 
> # Plot point on image.
> hold(True)
> ax1.plot([0.0],[0.0],'wo')
> 
> show()
> 
> 
> 
> -------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job 
> easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users