Automatic calculation method for global coordinate system under multiple-association engineering chart environment

An automatic calculation and coordinate system technology, applied in the direction of comprehensive factory control, electrical program control, sequence/logic controller program control, etc., can solve the problems of easy error and low efficiency, and achieve error reduction and high versatility , The effect of improving design efficiency

Inactive Publication Date: 2009-04-08
NANJING UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The conversion process requires a series of mutual comparisons of engineering drawings, reference and coordinate conversion, and manual calculations are prone to errors and low in efficiency

Method used

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  • Automatic calculation method for global coordinate system under multiple-association engineering chart environment
  • Automatic calculation method for global coordinate system under multiple-association engineering chart environment
  • Automatic calculation method for global coordinate system under multiple-association engineering chart environment

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Embodiment Construction

[0024] The basic starting point of the automatic calculation method of the global coordinate system in the multi-associated engineering drawing environment is to automatically identify the dimension lines in the engineering drawing, gradually combine them into an orthogonal grid, a local logical coordinate system and a global logical coordinate system, and record the corresponding transformation matrix. Finally, the global coordinates are generated.

[0025] Below in conjunction with accompanying drawing, the present invention is explained in more detail:

[0026] Such as figure 1 shown. figure 1 Step 1 in is the initial action. Step 2 Input an engineering project, which includes a set of association diagrams. Step 3 Take one of the engineering drawings.

[0027] Step 4 Calculate the threshold value d of this image from the given engineering drawing. The calculation method of this threshold value is to take all the strings in this image and count their average height. The...

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Abstract

The invention provides an automatic calculation method of a world coordinate system under the condition of a multiple associative engineering drawing. The basic starting point of the invention is that an orthogonalaxes net, a local logical coordinate system and a world logical coordinate system are gradually combined through a dimension line in an automatic identification engineering drawing and a corresponding transformational matrix is recorded, at last, the world coordinate system is generated. The invention has the advantages that an association diagram drawn in different scales and directions is input in the CAD environment, a world coordinate system of a project can be automatically generated; the world coordinate system is a premise condition for accurately calculating various engineering data and other relevant engineering application, the method can save large quantity of manual calculation expense, and an error caused by the manual calculation is effectively reduced, to improve the auxiliary design efficiency of a computer. The method has high generality, and can be applied in various engineering fields.

Description

technical field [0001] The invention relates to a calculation method for a global coordinate system in an engineering drawing, in particular to an automatic calculation method for the global coordinate system in a multi-associated engineering drawing environment. Background technique [0002] CAD technology has been widely used in many engineering fields including machinery, manufacturing, construction, electronics, chemical industry, roads and bridges. In many engineering applications (such as budget estimation, bidding and other engineering data calculations), it is often necessary to calculate the global logical coordinates in a multi-association diagram environment based on the drawing coordinates in a certain CAD engineering drawing. An engineering project is often composed of multiple associated engineering drawings; the same engineering drawing may be further divided into several areas that are independent in graphics and related in content to describe different aspec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/00G01B21/04G05B19/04
CPCY02P90/02
Inventor 路通杨若瑜苏丰蔡士杰
Owner NANJING UNIV
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