#
# Mouse mode (ctrl-right-mouse-button) to delete individual surface triangles.
# Open this file in Chimera to activate the mouse mode.
#
# Warning: Deleted triangles will not be recorded in Chimera session files.
#
# Tested in Chimera version 1.2524, daily build from June 4, 2008.
# Will not work in production release 1.2470 from Nov 2007.
#
def mouse_down_cb(viewer, event):
    
    from VolumeViewer import slice
    xyz_in, xyz_out = slice.clip_plane_points(event.x, event.y)

    import PickBlobs
    smlist = PickBlobs.surface_models()
    dist, p, tri = PickBlobs.closest_surface_intercept(smlist, xyz_in, xyz_out)
    if p is None:
        from chimera.replyobj import status
        status('Missed surface (%d,%d)' % (event.x, event.y))
        return

    m = p.triangleAndEdgeMask
    if m is None:               # No triangles hidden yet
        from numpy import zeros, int32
        m = zeros((p.triangleCount), int32)
        m.fill(0xf)
    # Convert masked geometry triangle index to full geometry index
    t = (m&0x8).nonzero()[0][tri]
    m[t] ^= 0x8               # Toggle triangle display.
    p.triangleAndEdgeMask = m

    import Surface
    if hasattr(Surface, 'set_visibility_method'):
        Surface.set_visibility_method('static', p.model)

from chimera import mousemodes as m
m.addFunction('hide triangle', (mouse_down_cb, None, None))
m.setButtonFunction('3', ['Ctrl'], 'hide triangle')