| The main job of this graduation thesis is to realize the painting module of making map of earth system (an application of GIS). In this paper the following knowledge are presented: the mapping mechanism of coordinates from logic to device in VC++ Language, the mapping of window original point to view port original point in VC++ Language, painting mechanism in VC++, and the realization of three kinds of coordinates which are used for device independent output of the making map of earth system and their mapping relations. And also this thesis detailed introduces the realization of device independent painting of making map of earth system.This program achieves the following functions:1 .It can draw the delineation dependent of coordinate points;2.It can go along the delineation with operation (including saving, magnifying, shrinking, dragging)and so on;3.It can also print the delineation. |
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