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GIS universal symbol system based on virtual machine and construction method thereof

A technology of geographic information system and general symbol, applied in the field of general symbol system of geographic information system and its construction, which can solve the problems of unusable symbols, time-consuming and labor-intensive, and no universality.

Inactive Publication Date: 2006-09-27
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, various geographic information system (GIS) software platforms on the market have realized their own map symbols, but these map symbols are only designed for a specific platform and are not universal. Often, symbols designed for a platform cannot use on another platform
And designing a set of symbols is a very time-consuming and laborious work, so there is an urgent need for a general symbol system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Implementation of the MapObject symbolic virtual machine: When implementing the MapObject symbolic virtual machine, since MapObject allows users to customize symbols through COM, we only need to implement a COM component that conforms to the MapObject symbolic interface, and call the core virtual machine in the COM component to solve the problem. How to call the core virtual machine problem.

[0036] As for the callback functions for implementing drawing instructions, since the MapObject draws on the Windows HDC, we can implement these callback functions as long as we call the Windows GDI functions.

Embodiment 2

[0038] Implementation of CMICS 2.0 symbolic virtual machine: Since CMICS 2.0 is self-developed, its symbolic work is realized by directly calling the core virtual machine, so it is very intuitive how to call the core virtual machine; for drawing instructions, it is also implemented by calling Windows GDI of.

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Abstract

This invention relates to an GIS universal symbol system based on virtual machine and construction method thereof, which comprises the symbolic language, a symbolic compiler, a symbolic integrated development environment, and a symbolic VM. Wherein, the construction method comprises: masking GIS platform difference with the symbolic VM to provide uniform interface for symbolic database implementation and realize the generalization of symbolic database on different GIS platform.

Description

technical field [0001] The invention relates to the field of information, in particular to a virtual machine-based general symbol system for geographic information systems and a construction method thereof. Background technique [0002] At present, various geographic information system (GIS) software platforms on the market have realized their own map symbols, but these map symbols are only designed for a specific platform and are not universal. Often symbols designed for a platform cannot Use on another platform. And designing a set of symbols is a very time-consuming and laborious work, so a general symbol system is urgently needed. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a virtual machine-based general symbol system for geographic information systems and its construction method, which is suitable for computer software systems related to GIS and electronic maps. [0004] The present invention solves i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F9/44G06F9/455G06F17/30
Inventor 朱欣焰苏科华周春辉呙维
Owner WUHAN UNIV
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