数字图框模型构建及智能绘制算法研究

Research on Digital Drawing Frame Model Construction and Intelligent Rendering Algorithm

图框是地图的关键构成部分,其智能化水平是实现批量制图的前提条件。为了提高图框智能绘制水平,文章通过对图框风格、构成要素、框架体系的深入分析,基于关系数据库思想与结构,从数学基础、比例尺参数、绘制参数、坐标网参数和其他图饰等方面构建新型数字图框模型,提出了图框自动绘制时数学基础控制、图框结构与搭建、坐标网构建、关键注记计算等关键技术方案,并采用C#+MapGIS 10 API的二次开发技术实现了数字图框智能化绘制。研究结果表明:构建的新型数字化图框模型,可将图框要素的离散化信息进行整合并以数字化的形式存储,实现信息的高度分离,使得参数可控共享性大大提高,是实现图框智能化绘制重要保障;数学基础控制、框架结构搭建方法、坐标网构建、注记计算与定位技术是支撑图框自动绘制的关键,它们相对独立又相互依赖;可通过外接模块通讯技术为图例、接图表、比例尺等其它地图要素提供接口,为地图后续制作与智能化调整提供参考;利用C#+MapGIS 10 API可开发直接可用的图框制作程序,制图效率大为提高,对“快速智能化制图”而言具重要实践意义。

The drawing frame is the key component of map,and its intelligence level is the precondition of realizing batch mapping.In order to improve the level of intelligent drawing of frame,this paper makes an in-depth analysis of the picture frame style,constituent elements and frame system,and based on the idea and structure of relational database,constructs the new digital graph frame model from the aspects of mathematical basis,scale parameters,drawing parameters,coordinate network parameters and other graphics,puts forward some key technical schemes,such as mathematical basic control,frame structure and construction,coordinate network construction and key note calculation,and uses C#+MapGIS 10 API secondary development technology to realize the intelli-gent drawing of digital drawing frame.The results show that the new digital picture frame model can integrate the discrete information of drawing frame elements and store it in a digital form,so as to achieve a high degree of information separation and greatly improve the controllable sharing of parameters,which is an important guarantee to realize intelligent drawing of frame;mathematical basic control,frame structure construction method,coordinate network construction,annotation calculation and positioning technology are the key to support the automatic drawing of frame,they are relatively independent and interdependent;the application of communication technology of external modulecan provide interface for other map elements,such as legend,graph,scale,etc.,and provide reference for subsequent map making and intelligent adjustment;using C#+MapGIS 10 API,we can develop a directly available program for drawing frame making,which greatly improves the efficiency of drawing and has important practical significance for"quick and intelligent drawing".