| The route selection of urban rail transit is an important part in the survey and design of urban rail transit.Therefore,in the relevant route selection work,it is necessary to comprehensively consider the relevant factors and technical conditions of various aspects to conduct multiple route plan comparisons,and after multiple reports and discussions,modify and select a more reasonable route plan.Therefore,an interactive design environment that can realize the more accurate expression of the design ideas of route schemes and revision opinions in the seminar work meeting environment,and can realize and display the contents of the revision opinions instantly is what the overall design group of route selection urgently hopes to achieve.The interactive electronic whiteboard provides the possibility for the realization of this concept.It has the advantages of "high technology integration,strong resource integration,and good interactive functions".It can provide users with an interactive teaching environment and can be used in business meetings and daily routines.So it has unique technical advantages.The main content of this paper is to develop a fitting algorithm and a fitting program that can be used to fit hand-painted slope sections in the design of urban rail transit profiles,so that the design of urban rail transit profile can make full use of interactive electronic technical advantages of the whiteboard,which means that users can use the SMART interactive whiteboard to complete the hand-drawn design of the profile.Furthermore,the profile design results can be output in the DWG format commonly used by the design unit,making the design process of urban rail transit route selection faster and more convenient.The main research results are as follows:1.On the basis of the realization of the interface between SMART interactive electronic whiteboard and Auto CAD,we have realized the interactive operation of two kinds of hardware and software devices,including drawing a profile containing basic information according to the plan information,hand-drawn operation,using board eraser to delete entities,etc.2.Some secondary development examples and skills on the basis of learning Auto CAD Object ARX(VC)development were mastered.And on this basis combined with SMART interactive electronic whiteboard,two operations on the interactive electronic whiteboard in Auto CAD were carried out During this development and expansion,the interactive whiteboard longitudinal section slope fitting function and longitudinal section slope element labeling function were newly added.3.This paper refers to the sample curve fitting algorithm of the interactive electronic whiteboard prepared by Zhang Ruitao of Southwest Jiaotong University.Based on the inflection point detection algorithm based on the Euclidean distance,this algorithm studies and determines the algorithm of each function required to fit the line through Regression Analysis,Least Squares and cubic parabolic transition curve parameter equations.However,because the algorithm is aimed at the plan design of railway lines,the algorithm has been adapted to ensure that it can realize the design function of urban rail transit profile.The rewriting mainly includes: determining the slope changing section of the slope,determining point of gradient change,calculating the radius of each vertical curve in the profile,determining the control points of the longitudinal section,drawing the straight section of the slope section,the circular curve type vertical curve,and the vertical curve elements.4.According to the modified profile slope fitting algorithm,using Visual Studio 2008,Auto CAD2010 and Object ARX2010 as development platforms,we write a profile handpainted slope section fitting program to complete the interactive electronic whiteboard urban rail transit profile design system.Users can realize hand-drawn urban rail transit profiles through commands and menu items,and ensure certain accuracy. |
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