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Geomatics Science and Technology 测绘科学技术, 2015, 3(4), 67-85
Published Online October 2015 in Hans. /journal/gst
/10.12677/gst.2015.34010
Effect on Application by Mechanism of GDI
Rendering Functions and Solutions
1 2
Chunmei Chen , Qingyuan Li
1
China University of Mining Technology, Beijing
2
Chinese Academy of Surveying and Mapping, Beijing
nd th nd
Received: Oct. 2 , 2015; accepted: Oct. 18 , 2015; published: Oct. 22 , 2015
Copyright © 2015 by authors and Hans Publishers Inc.
This work is licensed under the Creative Commons Attribution International License (CC BY).
/licenses/by/4.0/
Abstract
GDI drawing-functions in Windows API were analyzed and we found that GDI drawing-function
mapped the world coordinate system (Cartesian coordinate system) origin (0,0) to the pixel cen-
ter between (0,0) and (1,1) of the device coordinate system (screen coordinates). It pointed out
that in order to maintain the same graphic geometric features and avoiding overprinting, GDI
drawing functions compromised with the endpoints and the boundary pixels, which caused some
strange phenomenon many programmers have not found and it was difficult to understand. In re-
sponse to these phenomena, explanations are given. In addition, the effect on some applications is
pointed out and solutions are proposed.
Keywords
Graphics Device Interface, Drawing-Function, Primitive Output, Geometric Features
GDI绘图函数机制对应用程序的影响和
解决方法
1 2
陈春梅 ,李青元
1 中国矿业大学(北京) ,北京
2 中国测绘科学研究院,北京
文章引用: 陈春梅, 李青元. GDI 绘图函数机制对应用程序的影响和解决方法[J]. 测绘科学技术, 2015, 3(4): 67-85.
/
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