Hello,

I found myself constantly needing to re-center on different regions of EM density maps, and I was originally just dropping spheres on the surface, centering on those, then deleting them. Finally I got sick of that and wrote this. It will center the window on the surface of whatever surface the mouse is currently overlaying.

I found this to be a very helpful addition when looking at large EM maps, and was thinking other people might too, after using it for a while I feel as though it could be part of trunk since I use it so much.

basically it would require the addition of this to standard_accelerators.py

... other accelerators..

('zx', 'Center view on surface where mouse is located', center_on_surface_at_mouse),

... zx because it's close to where you rest your hands on the keyboard...

def center_on_surface_at_mouse():

from chimera import selection, tkgui

hits = []

w = tkgui.app.graphics

x = w.winfo_pointerx() - w.winfo_rootx()

y = w.winfo_pointery() - w.winfo_rooty()

from Surface import surface_models

import VolumePath.tracer as tracer

hits.extend(tracer.surface_intercepts(x, y, surface_models()))

xyz, model = tracer.closest_hit(hits)

print(xyz)

if xyz:

print('cofr %f,%f,%f' % (xyz[0],xyz[1],xyz[2]))

chimera.runCommand('cofr %f,%f,%f' % (xyz[0],xyz[1],xyz[2]))

chimera.viewer.camera.center = xyz

cheers!

~Dan