On Mon, 28 Nov 2005, Charlie Moad wrote:
The repr of an xform shows the opengl rotation matrix. I want to get this efficiently in python, but I don't believe it is exposed. Could a getter please be added returning a 4x4 tuple, so a Numeric array can be trivial/efficiently made from it? If there is a current approach please let me know.
The new and improved method is to use the getCoordFrame method :-) and the coorresponding Xform.coordFrame constructor. I agree that it would be better for Python to have a method that returned a Numeric array. Example: >>> xf = chimera.Xform.zRotation(30) >>> x, y, z, o = xf.getCoordFrame() >>> print "x: %s, y: %s, z: %s, o: %s" % (x, y, z, o) x: 0.866025 0.5 0, y: -0.5 0.866025 0, z: 0 0 1, o: 0 0 0 Using getCoordFrame would simplify PDBmatrices.matrices.xform_matrix to be: rx, ry, rz, t = xform.getCoordFrame() return ((rx[0], ry[0], rz[0], t[0]), (rx[1], ry[1], rz[1], t[1]), (rx[2], ry[2], rz[2], t[2])) You could do something similar to construct a Numeric array. Xforms have improved in the latest release. Now you can easily make copies of matrices using the constructor: xformprime = chimera.Xform(xform) or: import copy xformprime = copy.copy(xform) Type: help(chimera.Xform) to see all of the methods and static methods. Hope this helps, Greg Couch UCSF Computer Graphics Lab gregc@cgl.ucsf.edu