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

An automatic positioning, global coordinate technology, applied in the direction of comprehensive factory control, electrical program control, program control in sequence/logic controllers, etc., can solve the problems of easy error and low efficiency, achieve high versatility, improve design Efficiency, the effect of saving manual calculation overhead

Inactive Publication Date: 2008-03-19
NANJING UNIV
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Problems solved by technology

The conversion process requires a series of mutual comparisons of engineering drawings, referen

Method used

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

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Embodiment Construction

[0026] The basic starting point of the automatic positioning method of global coordinates in the context of associated engineering drawings is to automatically identify the dimension lines in the engineering drawings, gradually combine them into orthogonal grids, local logical coordinate systems and global logical coordinate systems and record the corresponding transformation matrix, and then receive Input any drawing coordinates, and then calculate the global logical coordinates under the condition of multi-association graph integration according to the corresponding transformation matrix.

[0027] As shown in Figure 1. Step 1 in Figure 1 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.

[0028] 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 ...

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Abstract

The invention provides an automatic locating method of a world coordinate system under the condition of an associative engineering drawing, the method is gradually combined into an orthogonal axes net, a local logical coordinate system and a world logical coordinate system through a dimension line in an automatic identification engineering drawing, and a corresponding transformational matrix is recorded, and then any drawing coordinate input is received, the world coordinate system under the integration condition of a multiple associative engineering drawing is obtained by calculating according to the corresponding transformational matrix. The invention has the advantages that an association diagram drawn in different scales and directions is input in the CAD environment, any drawing coordinates in any engineering drawings are automatically and accurately concerted to the corresponding world logical coordinate, the invention can be used for the exact location to any engineering objects under the condition of the world environment, thereby saving large quantity of mutual calculation cost; the auxiliary design efficiency of a computer is effectively improved, and can be further used for the exact calculation of a three-dimensional reconstruction and various engineering data, etc. The method has high generality, and the invention can be applied in various engineering fields.

Description

technical field [0001] The invention relates to a positioning method of global coordinates in engineering drawings, in particular to an automatic positioning method of global coordinates 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, which is used to make a certain engineering object Global positioning or subtraction calculations in global coordinates. An engineering project is often composed of multiple associated engineering drawings; the same engineering drawing may be further divided in...

Claims

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Application Information

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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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