, according to the evaluation of GIS spatial data management and spatial point data provided text files, contains the ID, name, X, Y four field information,

Read the data, and display in the window point coordinates X, Y, with black solid round draw,
1. Mouse click on any three points, the point of attachment, with black brush to draw a line,
2. The mouse pull box a rectangular area, the rectangle within the scope of the query point out, with yellow fill solid points, said the selected point elements, 3.
Mouse click on any point, the line color yellow, move any point, after amend the new coordinate information saved to a text file,

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