Function to allow editing of QGIS point coordinates via the Python console.

qgisMovePoint.py

# Arrgh... QGIS doesn't appear to have a way of editing the coordinates of a point.  Only input via CSV
# files.  This is the way to go for large numbers of coordinates but it just plain sucks balls for
# dealing with a handful of points.  I don't know much about the guts of QGIS so I can't submit a formal
# fix, but it does have a python interpreter...

# Based on code given in this post by Carson Farmer:
#
#   http://www.mail-archive.com/qgis-user@lists.osgeo.org/msg01446.html
#
# Date: 11/04/2008
#
# Updated to work with QGIS v. 1.4.0 by Charlie Sharpsteen

def move_point():
  # Need this to create the dialog.
  from PyQt4.QtGui import *
  
  # Shortcut to iface.
  iface = qgis.utils.iface

  # Recover currently active layer- *must* be selected in legend pane for this to work.
  layer = iface.mapCanvas().currentLayer()
  
  # this is the currently selected feature, if more than one is selected, only the first is used
  feature = layer.selectedFeatures()[0]
  # this is used to get the point coordinates
  point = feature.geometry().asPoint()

  # this is the input dialog
  input = QInputDialog.getText( iface.mainWindow(), "Move Point Feature", "Enter New Coordinates as 'xcoord,ycoord'", 
  QLineEdit.Normal, str( point.x() ) + "," + str( point.y() ))

  # now we translate the later by the distance between the original point, and the user specified point
  layer.translateFeature( feature.id(), input[0].split( "," )[ 0 ].toDouble()[ 0 ] - point.x(), input[ 0 ].split( "," )[ 1 ].toDouble()[ 0 ] - point.y() )

  # we have to update the extents of the layer so it knows about the change
  layer.updateExtents()
  # don't know if this is required...
  QgsMapLayerRegistry.instance().addMapLayer(layer)
  
  # now refresh the map canvas
  iface.mapCanvas().refresh()