Web应用中基于不规则三角网格的Contour图绘制  

Contour Drawing Based on Triangulated Irregular Network in Web Application

作　　者：古小敏[1] 宋小鹏 何秀锦 吴国珊 王斌武 GU Xiaomin;SONG Xiaopeng;HE Xiujin;WU Guoshan;WANG Binwu(School of Energy and Building Environment,Guilin University of Aerospace Technology,Guilin 541004,China)

机构地区：[1]桂林航天工业学院能源与建筑环境学院,广西桂林541004

出　　处：《测绘与空间地理信息》2021年第6期72-75,共4页Geomatics & Spatial Information Technology

基　　金：教育部首批“新工科”研究与实践项目(能源、电器、核工程类项目群No.18);广西自然科学基金——低温余热耦合太阳能光热用于生物质气化制氢的热动力学特性项目(2018GXNSFAA281306)资助。

摘　　要：尝试在Web应用中提出基于不规则三角网格单元(TIN,Triangulated Irregular Network)的Contour算法:先生成图例Legend,再根据三角形顶点数值和等值线分布将三角形分为3类,据此把三角形进一步划分为若干区域,以填充对应颜色。同时引入基于硬件加速的WebGL方式绘制Contour,结果表明,基于Web GL的Contour图绘制过程CPU耗时远小于canvas方式。An algorithm to drawing contour based on TIN(triangulated irregular network)in a web application has been put forward.After Legend selected,triangles are classified into three categories according to the vertex value and the isolines.The triangles were further separately divided into several regions to fill with corresponding color.Also method via Web GL with hardware accelerated technology has been used to draw a Contour.The result shows that the CPU time cost by the process of drawing contour via Web GL is much less than the method via canvas drawing.

关 键 词：CONTOUR 不规则三角形网格 WEBGL 

分 类 号：P285.1[天文地球—地图制图学与地理信息工程]