| 摘要 |
PURPOSE: A magnification and reduction method for material about area selected from image editor is provided to reduce memory space to memorize node co-ordinates, and increase also speed of magnification change of area information by using span table to be made a magnification change. CONSTITUTION: A node co-ordinates corresponding to picture area to reduce or magnify is got at a selection mode of picture area in the first process(6a). A span table is got and stored from the node co-ordinates against the selected area of the first process in the second process(6b). The node co-ordinates that got from the second process is erased and then boundary line is drawn using the span table, and then a part enclosed with an external quadrangle is made a magnification change in the third process(6c). A co-ordinates of the span table of the third process is made a magnification change(6d), and then clipping is made using above span table, and then reduce and magnification treatment is made drawing boundary line in the fourth process(6e).
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