CN110503727B - Batch rapid splicing method for CAD arbitrary multi-section lines - Google Patents
Batch rapid splicing method for CAD arbitrary multi-section lines Download PDFInfo
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Abstract
The invention provides a batch rapid splicing method for any CAD multi-section lines, which comprises the following steps of 1, reading multi-section lines to be spliced, and selecting and reading XY coordinates and Z elevations of each straight line, each multi-section line, each two-dimensional multi-section line and each vertex on each three-dimensional multi-section line in batch; step 2, checking, deleting and marking the read multi-section line; step 3, circularly traversing the head and tail end points of any multi-section line to be spliced, sequentially searching the head and tail end points of the spliced multi-section line which has the same attribute as the Z end point and is closest to the Z end point, and marking; step 4, automatically judging to adopt a sequential or reverse sequential splicing mode according to the spliced multi-section line, the closest multi-section line to be spliced and the head and tail end points of the multi-section line to be spliced, and splicing and marking; and 5, sequentially and circularly performing the steps 3 and 4 to finish splicing, and drawing the spliced multi-section lines based on the original multi-section line attributes. The method has the advantages of simple technical principle and easy operation, has great superiority compared with the prior art method, and is worthy of popularization and application in a large number of CAD engineering drawings in the future.
Description
Technical Field
The invention relates to the field of CAD engineering drawing, in particular to a batch rapid splicing method for any multi-section lines of CAD.
Background
The field of CAD engineering drawings often involves the process of splicing a large number of multi-segment lines. In particular to the processing of channel water depth map or channel topographic map data. CAD includes various types of objects such as straight lines, multi-segment lines, two-dimensional multi-segment lines, and three-dimensional multi-segment lines. Wherein, the straight line in CAD is the connection line of the first and the last endpoints, and only the first and the last endpoints; the multi-section line is a connecting line between two or more end points, is a whole, and the line sections drawn by adopting the straight line command are mutually separated. In addition, there are two-dimensional multi-segment lines, three-dimensional multi-segment lines, and the like. Two-dimensional multi-segment lines differ from multi-segment lines in that the data of a two-dimensional multi-segment line is complex, each vertex has layer, space, handle properties, and all vertices of a multi-segment line have the same layer, space, handle properties, etc. The Z coordinates of each point of the two-dimensional multi-section line are the same as those of the multi-section line; the three-dimensional multi-section line can draw a space curve, and Z coordinates of each point can be different.
Because CAD multi-segment lines are of multiple types and the data structures are all different, although CAD provides multi-segment line splice commands, there are several problems with performing multiple multi-segment line splices: (1) the steps are very complicated and complicated when the different types of multi-section lines are spliced, and the splicing failure is very easy; (2) when the three-dimensional multi-section lines are not arranged on one plane, the three-dimensional multi-section lines cannot be spliced directly; (3) automatic matching and splicing of a large number of different high Cheng Duoduan wires cannot be achieved.
In a channel water depth map or a channel topography map, due to various reasons such as drawing software, drawing modes, post-treatment and the like, drawn contour lines, contour lines or water edges and the like are often discrete, and great difficulty is brought to post-extraction and editing. As shown in fig. 1, many contours are broken by elevation points, and some appear as a continuous line, effectively broken into multiple segments, making their selection, extraction, and editing very difficult. The traditional method selects objects one by one, has the defects of complex work, large workload, time and labor waste, low efficiency and large repeated complex work still required for later re-editing. Particularly, when a large number of multi-segment lines with different Z attribute needs to be automatically spliced, a traditional method is not more rapid and effective, such as how to automatically splice multi-segment lines with similar Z attribute values and identical distances, which are discrete and have different Z attribute values (elevation values) contour lines exist in fig. 1, the traditional method can only be used for selecting and splicing one by one, and is very time-consuming, labor-consuming and extremely low in efficiency.
Disclosure of Invention
The invention provides a batch rapid splicing method for any multi-section lines of CAD (computer aided design) for solving some problems in the multi-section line splicing in the existing CAD engineering drawing field, which has the advantages of simple technical principle, easy operation and great superiority compared with the prior art method, and is worthy of popularization and application in a large number of CAD engineering drawings in the future.
The technical scheme of the invention is as follows:
a CAD arbitrary multi-section line batch rapid splicing method comprises the following steps:
step 1, reading multi-section lines to be spliced, and selecting and reading XY coordinates and Z elevations of each straight line, each multi-section line, each two-dimensional multi-section line and each vertex on each three-dimensional multi-section line in batches;
step 2, checking, deleting and marking the read multi-section line;
step 3, circularly traversing the head and tail end points of any multi-section line to be spliced, sequentially searching the head and tail end points of the spliced multi-section line which has the same attribute as the Z end point and is closest to the Z end point, and marking;
step 4, automatically judging to adopt a sequential or reverse sequential splicing mode according to the spliced multi-section line, the closest multi-section line to be spliced and the head and tail end points of the multi-section line to be spliced, and splicing and marking;
and 5, sequentially and circularly performing the steps 3 and 4 to finish splicing, and drawing the spliced multi-section lines based on the original multi-section line attributes.
The specific method of the step 2 comprises the steps of,
(1) Checking whether each vertex coordinate containing the head and tail end points of each multi-section line is duplicated or not, and deleting the duplicated vertex or end point coordinates;
(2) Checking whether the completely overlapped multi-section lines exist or not according to all the multi-section lines, and deleting the completely overlapped multi-section lines;
(3) For each multi-section line, checking whether the multi-section line is closed, marking the closed multi-section line as a multi-section line set which does not participate in the splicing, and marking the non-closed multi-section line as a multi-section line set which participates in the splicing.
The specific method of the step 3 comprises the steps of,
1) Aiming at any multi-section line to be spliced in the multi-section line set participating in splicing, searching the nearest splicing multi-section line end point from the multi-section line set participating in splicing by adopting a cyclic traversal method;
2) Aiming at any multi-section line to be spliced, when searching the nearest end point of the spliced multi-section line, comparing the two aspects of the attribute value of the end point Z and the distance of the end point, and selecting the end point of the spliced multi-section line which is within the threshold value and is nearest to the same condition of the attribute of the end point Z;
3) Aiming at the end point of the spliced multi-section line closest to the end point in the step 2), the serial numbers of the multi-section line to be spliced and the spliced multi-section line, the serial numbers of the two end points closest to the end point and the closest distance are marked.
The specific method of the step 4 comprises the steps of,
a. judging whether to circularly traverse each vertex of the spliced multi-section line in a positive sequence or a reverse sequence according to the positions of the head and tail end points of the multi-section line to be spliced and the spliced multi-section line closest to the multi-section line to be spliced, and finishing splicing;
b. after the splicing is completed, the new multi-section lines generated after the splicing is completed are marked as multi-section line sets which participate in the splicing, and the multi-section lines which participate in the splicing are marked as multi-section line sets which do not participate in the splicing, so that the subsequent splicing is not participated any more, and the searching and splicing efficiency is improved.
The specific method in the step 5 comprises the steps of newly building a layer for storing the spliced multi-section lines and automatically drawing the spliced multi-section lines according to the color attribute and the line type attribute of the multi-section lines before splicing.
And the steps 1 to 5 are realized by programming in CAD software by adopting a VBA module.
Compared with the prior art, the invention has the beneficial effects that: the program also has the advantages of automation and intellectualization, and for a large number of line segments of different types, the program can automatically judge adjacent line segments and adjacent endpoints so as to realize the splicing of different line segments with minimum distance; the problems of complex work, time and labor waste and low efficiency of selecting and editing objects one by one in the traditional method are solved, and particularly, automatic splicing of a large number of different Z attribute values can be realized, so that manpower and material resources are greatly saved, and the working efficiency is improved; the method has the advantages that the two parameters of the direct connection threshold value and the search radius are adopted, the connection can be directly carried out when the end point distance is smaller than the direct connection threshold value, the continuous search is not needed, otherwise, only the multi-section lines with the end point distance smaller than the search radius are selected for connection, and the efficiency of automatic splicing of a large number of multi-section lines can be greatly improved; the splicing mode is very flexible, can realize the splicing of any different types of multi-section lines such as straight lines, multi-section lines, 2D multi-section lines, 3D multi-section lines and the like, and can also realize the splicing of a plurality of multi-section lines with the same or different Z attribute values; with the visual interface, the technician can easily understand, master and operate the visual interface compared with the traditional command line input. The method has the advantages of simple technical principle and easy operation, has great superiority compared with the prior art method, and is worthy of popularization and application in a large number of CAD engineering drawings in the future.
Drawings
Fig. 1 is a schematic diagram of CAD multi-segment lines to be spliced.
FIG. 2 is a flow chart of the present invention.
FIG. 3 is a schematic diagram of an interface developed based on VBA in accordance with the present invention.
Fig. 4 is a schematic diagram of the AC point splicing principle of the multi-segment lines AB, CD.
Fig. 5 is a schematic diagram of the principle of AD spot splicing of the multiple lines AB, CD.
Fig. 6 is a schematic diagram of BC point splicing principle of the multi-segment lines AB, CD.
Fig. 7 is a schematic diagram of BD point splicing principle of the multi-segment lines AB, CD.
Fig. 8 is a schematic diagram of a CAD multi-segment line after stitching.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention discloses a method for realizing batch and rapid splicing of any CAD multi-section lines by adopting VBA programming, and the invention is further described with reference to drawings and specific embodiments.
Step 1, reading the multi-section lines to be spliced, and selecting and reading XY coordinates and Z elevations of all straight lines, the multi-section lines, two-dimensional multi-section lines and all vertexes (including head and tail endpoints) on the three-dimensional multi-section lines in batches.
The specific implementation method of the steps is as follows: running the interface program in FIG. 3 in the CAD, selecting the type of the multi-section line to be spliced, and selecting one of the types or checking a plurality of types; and setting related parameters, clicking a multi-section wire splicing button, selecting multi-section wires to be spliced according to the prompt box, and automatically screening and reading the multi-section wire types selected by the check boxes by a program.
And 2, checking, deleting and marking the multi-section line, wherein the step is that the program is automatically completed in the background without manual interaction. The specific principle and steps are as follows:
firstly, circularly traversing each vertex of each multi-segment line (comprising the head end and the tail end of each multi-segment line), checking whether each vertex coordinate is duplicated or not, and deleting the duplicated vertex coordinate;
secondly, for each multi-section line, traversing other multi-section lines circularly, checking whether the multi-section line completely overlapped with the multi-section line exists or not, and deleting the repeated multi-section lines;
finally, checking whether each multi-section line is closed or not, namely whether the coordinates of the head end and the tail end of the multi-section line are the same or not, if so, marking the multi-section line as a closed multi-section line, and not participating in the multi-section line set of the splicing; otherwise, marking the non-closed multi-section lines as a multi-section line set participating in splicing.
Step 3 and step 4 are two steps of one-time circulation traversal, and the steps are automatically completed in the background without manual interaction. The specific principle and steps are as follows:
firstly, aiming at two end points of the head and tail of any multi-section line to be spliced (the multi-section line is marked as AB) in a multi-section line set participating in splicing, calculating the distance between the head and tail end points of the spliced multi-section line (the multi-section line is marked as CD) in the multi-section line set participating in splicing by adopting a cyclic traversal method, wherein four distance values dAC, dAD, dBC, dBD exist when the head and tail end points are marked as C and D respectively, dAC is the distance from A to C, and the rest is the rest. The multi-section line AB to be spliced and each other multi-section line in the multi-section line set participating in the splicing are traversed once and recorded as one-time circulation traversal.
In the cycle traversal process, if the existence of the value smaller than the direct connection threshold value in dAC, dAD, dBC, dBD, stopping the cycle traversal, directly connecting and marking the corresponding two endpoints. If the endpoint distance value of the current cycle traversal is not smaller than the direct connection threshold value but smaller than the search radius, selecting two multi-segment lines and endpoints with the minimum endpoint distance for marking and connecting. Otherwise, if there is no smaller than the search radius, no marking and connection is performed.
In the traversal process of this circulation, for example, when the multi-segment lines AB and CD are spliced, there are different situations: (1) if the AC points are spliced, firstly, reversing the order of each vertex array (including the head and tail end points) of the CD multi-segment line, then splicing each vertex array of the AB multi-segment line to the back to generate a new multi-segment line DB, adding the DB into a multi-segment line set participating in splicing, and marking, as shown in figure 4; (2) if the AD point is spliced, each vertex array of the AB multi-section line can be directly spliced to each vertex array of the CD multi-section line, a new multi-section line CB is generated, and the CB is added into a multi-section line set participating in the splicing and marked, as shown in figure 5; (3) if the BC point is spliced, the vertex arrays of the AB and CD multi-segment lines can be spliced in sequence directly to generate a new multi-segment line AD, and the AD is added into a multi-segment line set participating in splicing and marked, as shown in FIG. 6; (4) if BD points are spliced, the vertex arrays of the CD multi-segment lines are in reverse order, and then spliced to the vertex arrays of the AB multi-segment lines, a new multi-segment line AC is generated, and the AC is added into a multi-segment line set participating in the splicing and marked, as shown in FIG. 7. After the four conditions (1) - (4) are completed, the spliced AB and CD multi-section lines need to be removed from the multi-section line set participating in splicing and marked. If no endpoint distance smaller than the searching radius exists in each cycle traversal, when no splicing is carried out, the original AB and CD multi-segment lines are reserved in the multi-segment line set participating in the splicing.
In addition, the invention also provides different splicing modes such as whether Z attribute values of each vertex of the multi-section line are different or not, as shown in the figure, the single selection frame of 'different Z values are independently spliced' and 'Z value difference is not considered', and the method is particularly characterized in that when the nearest distance of the endpoint is searched in the step 3, the former near consideration is given to the endpoint with the same Z value when the nearest distance of the endpoint is searched, namely, the endpoint with the same Z value attribute can be spliced; the latter does not consider the difference of the Z values of the endpoints when searching the nearest distance of the endpoints, and all endpoints can participate in distance calculation and splicing.
The specific implementation method of the invention is extremely simple, and other steps are automatically operated after the program except that the step 1 needs man-machine interaction to select in CAD. The interface program in fig. 3 is run in CAD as described above, the type of the multi-segment line to be spliced is selected, then the related parameters are set, the multi-segment line splicing button is clicked, the multi-segment line to be spliced is selected according to the prompt box, and the program can automatically screen and read the type of the multi-segment line selected by the check box. The effect of the spliced multi-segment line in fig. 1 is shown in fig. 8. The situation of clicking to select one multi-section line is also shown in the figure, and it can be seen that after the multi-section lines are spliced into one multi-section line, a plurality of objects become one object, so that the later selection and processing are very convenient.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A CAD arbitrary multi-section line batch rapid splicing method is characterized by comprising the following steps:
step 1, reading multi-section lines to be spliced, and selecting and reading XY coordinates and Z elevations of each straight line, each multi-section line, each two-dimensional multi-section line and each vertex on each three-dimensional multi-section line in batches;
step 2, checking, deleting and marking the read multi-section line;
step 3, circularly traversing the head and tail end points of any multi-section line to be spliced, sequentially searching the head and tail end points of the spliced multi-section line which has the same attribute as the Z end point and is closest to the Z end point, and marking;
step 4, automatically judging to adopt a sequential or reverse sequential splicing mode according to the spliced multi-section line, the closest multi-section line to be spliced and the head and tail end points of the multi-section line to be spliced, and splicing and marking;
step 5, sequentially and circularly steps 3 and 4 to finish splicing, and drawing spliced multi-section lines based on the original multi-section line attributes;
the specific method of the step 2 comprises the steps of,
(1) Checking whether each vertex coordinate containing the head and tail end points of each multi-section line is duplicated or not, and deleting the duplicated vertex or end point coordinates;
(2) Checking whether the completely overlapped multi-section lines exist or not according to all the multi-section lines, and deleting the completely overlapped multi-section lines;
(3) Checking whether the multi-section line is closed or not according to each multi-section line, marking the closed multi-section line as a multi-section line set which does not participate in splicing, and marking the non-closed multi-section line as a multi-section line set which participates in splicing;
the specific method of the step 3 comprises the steps of,
1) Aiming at any multi-section line to be spliced in the multi-section line set participating in splicing, searching the nearest splicing multi-section line end point from the multi-section line set participating in splicing by adopting a cyclic traversal method;
2) Aiming at any multi-section line to be spliced, when searching the nearest end point of the spliced multi-section line, comparing the two aspects of the attribute value of the end point Z and the distance of the end point, and selecting the end point of the spliced multi-section line which is within the threshold value and is nearest to the same condition of the attribute of the end point Z;
3) Aiming at the end point of the spliced multi-section line closest to the end point in the step 2), the serial numbers of the multi-section line to be spliced and the spliced multi-section line, the serial numbers of the two end points closest to the end point and the closest distance are marked;
the specific method of the step 4 comprises the steps of,
a. judging whether to circularly traverse each vertex of the spliced multi-section line in a positive sequence or a reverse sequence according to the positions of the head and tail end points of the multi-section line to be spliced and the spliced multi-section line closest to the multi-section line to be spliced, and finishing splicing;
b. after the splicing is completed, the new multi-section lines generated after the splicing is completed are marked as multi-section line sets which participate in the splicing, and the multi-section lines which participate in the splicing are marked as multi-section line sets which do not participate in the splicing, so that the subsequent splicing is not participated any more, and the searching and splicing efficiency is improved.
2. The method for quickly splicing any multi-segment lines of CAD according to claim 1, wherein the specific method step of the step 5 is that a layer is newly built for saving the multi-segment lines after splicing, and the multi-segment lines after splicing are automatically drawn according to the color attribute and the line type attribute of the multi-segment lines before splicing.
3. The batch rapid splicing method for any CAD multi-segment lines according to claim 1 or 2, wherein the steps 1 to 5 are realized by programming in CAD software using VBA modules.
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| CN115481475B (en) * | 2022-09-21 | 2023-09-19 | 金鹏装配式建筑有限公司 | Multi-section line superposition judging method for incapability of surface localization in CAD |
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