Ah thanks. I am used to the general math/physics convention of x axis being first. Caught between conventions I guess. Good to know why things are done differently.
I am using the mouse click event.xdata and event.ydata as indexes into an array. From what you say, it looks like I want to use im[im.shape[1]-y, x] to get the pixel a user clicked on. Is that correct? Thanks agaian, Tom On 03/15/2011 05:35 PM, Eric Firing wrote: > On 03/15/2011 10:23 AM, Tom Dimiduk wrote: >> It appears to me that when imshow tells you that the mouse cursor is at >> x=50, y=100 >> >> That corresponds to array element >> im[100, 50] >> >> Is there a reason imshow does not have x be the first coordinate of the >> array as I would think of as conventional usage? > > That is not conventional usage. Instead, for images, it common for the > image to correspond to a printout of memory, using the C convention. > Hence the column index is X, and incrementing the row index yields the > next line down on the page, thereby corresponding to a decrease in the Y > coordinate. > > Eric > >> >> Tom > > ------------------------------------------------------------------------------ > Colocation vs. Managed Hosting > A question and answer guide to determining the best fit > for your organization - today and in the future. > http://p.sf.net/sfu/internap-sfd2d > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
