According to VB read TXT coordinate data, achieve simple curve drawing.

Filename	Size	Update
vb读取坐标绘图\abc.txt	76	2018-04-29
vb读取坐标绘图\坐标系练习.frm	4243	2018-04-29
vb读取坐标绘图\坐标系练习.log	79	2018-04-29
vb读取坐标绘图\坐标系练习.vbp	640	2018-04-29
vb读取坐标绘图\坐标系练习.vbw	51	2018-06-05
vb读取坐标绘图	0	2018-04-29

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