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《Journal of Engineering Graphics》 2005-01

## Automatic Drawing of Clothoid Curve for Railway or Highway Based on AutoCAD

QIU Rong-mao1, WANG Da-ming2, ZHOU Qiao-yong1 (1.College of Civil Engineering, Shijiazhuang Railway Institute, Shijiazhuang 050043, China;2.College of Mechanical Engineering, Shijiazhuang Railway Institute,Shijiazhuang 050043, China)
This paper Introduces the concept of formation, primary points and synthetic elements of the clothoid curve in line engineering drawing for Railway or Highway. The equation describing clothoid curve and formula calculating primary points coordinate of clothoid curve are presented by means of geometry, calculus and progression. Multiple alternations of user coordinate make the user coordinate of AutoCAD is identical with that of clothoid curve. On the basis of this, by programming of AutoLISP, automatic drawing of clothoid curve along with circular is achieved.
【CateGory Index】： TP391.72
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 【References】
 Chinese Journal Full-text Database 1 Hits
 1 WANG Ming-sheng, YAN Xiao-yong ( College of Transportation Engineering, Shijiazhuang Railway Institute, Shijiazhuang Hebei 050043, China );Study on Drawing Method of Transition Curve in GIS[J];Journal of Engineering Graphics;2010-01
 【Co-references】
 Chinese Journal Full-text Database 4 Hits
 1 ZHANG Fu-rong,JIAO Guang-yan;Coordinate Calculation of Points on Medial Transition of Ovum-shaped Curve Using Re-building Method[J];Bulletin of Surveying and Mapping;2004-01 2 Li QuanXin,Ye Gang (Zhengzhou Planning & Survey Research Institute,Zhengzhou 450052,China);Precise Displaying of Complete and Incomplete Easement on AutoCAD[J];Urban Geotechnical Investigation & Surveying;2007-01 3 ZHANG Xiao-dong,WANG Ming-sheng(School of Communication Engineering,Shijiazhuang Railway Institute,Shijiazhuang Hebei 050043,China);Integrated Interactive Design of Plan with Profile and Cross-section of Railway Line in AutoCAD Environment[J];Journal of Engineering Graphics;2006-05 4 WANG Zhong-wei(Road and Bridge Engineering Department,Hunan Communications Polytechnic,Changsha Hunan 410004,China);Algorithm and Realization of Automatic Drawing of Center Line for Road and Ramp[J];Journal of Engineering Graphics;2007-01
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