CN115238331B - CAD graph processing method, device, equipment and storage medium - Google Patents
CAD graph processing method, device, equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a CAD graph processing method, a CAD graph processing device, CAD graph processing equipment and a CAD graph processing storage medium. The method comprises the following steps: acquiring a line forming a first CAD graph on a display interface; acquiring a first parameter input by a user; performing virtual combination on lines with the target distance smaller than or equal to the first parameter in the first CAD graph according to the first parameter to obtain a second CAD graph; acquiring a mapping relation between a topological surface and a topological ring of a second CAD graph; screening the topological surface of the second CAD graph according to the mapping relation between the topological surface of the second CAD graph and the topological ring to obtain a third CAD graph; acquiring the mapping relation between the topological rings and the topological lines of the third CAD graph and the mapping relation between the topological lines and the topological points; and screening the topological lines of the third CAD graph according to the mapping relation between the topological rings and the topological lines of the third CAD graph and the mapping relation between the topological lines and the topological points to obtain a target CAD graph. The embodiment of the invention can shield the dirty geometry problem caused by precision difference, modeling and the like among modeling software.
Description
Technical Field
The present invention relates to the field of graphics processing technologies, and in particular, to a method, an apparatus, a device, and a storage medium for CAD graphics processing.
Background
The pre-processing is the main performance bottleneck of numerical simulation of complex problems, and the reliable and efficient automatic pre-processing algorithm is the key for improving the numerical simulation efficiency and precision. The preprocessing mainly includes grid generation and CAD (Computer Aided Design) preprocessing facing the grid generation. In contrast to the progress of automatic grid generation, the research on automatic CAD graphics processing is receiving continuous attention, but there is still a great gap between the current research situation and the actual demand. In practical applications, CAD graphs have various "dirty geometry problems" due to differences in accuracy between modeling software, modeling, and the like.
Disclosure of Invention
The invention provides a CAD graph processing method, a device, equipment and a storage medium, which are used for solving the dirty geometry problem of the generated CAD graph caused by the precision difference, modeling and other reasons among modeling software and can achieve the beneficial effect of outputting clean geometry suitable for grid generation requirements.
According to an aspect of the present invention, there is provided a CAD drawing processing method, including:
acquiring a line forming a first CAD graph on a display interface;
acquiring a first parameter input by a user;
performing virtual combination on lines with the target distance smaller than or equal to the first parameter in the first CAD graph according to the first parameter to obtain a second CAD graph;
acquiring a mapping relation between a topological surface of the second CAD graph and a topological ring, wherein the topological surface comprises at least one topological ring, the topological ring is a two-dimensional graph formed on the basis of lines, and the topological surface is a two-dimensional graph formed on the basis of the topological ring;
screening the topological surface of the second CAD graph according to the mapping relation between the topological surface of the second CAD graph and the topological ring to obtain a third CAD graph;
acquiring the mapping relation between the topological rings and the topological lines of the third CAD graph and the mapping relation between the topological lines and the topological points;
and screening the topological lines of the third CAD graph according to the mapping relation between the topological rings and the topological lines of the third CAD graph and the mapping relation between the topological lines and the topological points to obtain a target CAD graph.
According to another aspect of the present invention, there is provided a CAD drawing processing apparatus, including:
the first acquisition module is used for acquiring lines forming a first CAD graph on a display interface;
the second acquisition module is used for acquiring a first parameter input by a user;
the virtual merging module is used for virtually merging the lines of the first CAD graph according to the first parameter to obtain a second CAD graph;
the third acquisition module is used for acquiring the mapping relation between a topological ring and a topological surface of the second CAD graph, wherein the topological surface comprises at least one topological ring, the topological ring is a two-dimensional graph formed on the basis of lines, and the topological surface is a two-dimensional graph formed on the basis of the topological ring;
the first screening module is used for screening the topological surface of the second CAD graph according to the mapping relation between the topological surface and the topological ring of the second CAD graph to obtain a third CAD graph;
a fourth obtaining module, configured to obtain a mapping relationship between a topological ring and a topological line of the third CAD drawing, and a mapping relationship between a topological line and a topological point;
and the second screening module is used for screening the topological lines of the third CAD graph according to the mapping relation between the topological rings and the topological lines of the third CAD graph and the mapping relation between the topological lines and the topological points to obtain a target CAD graph.
According to another aspect of the present invention, there is provided an electronic apparatus including:
at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor to enable the at least one processor to perform the CAD graph processing method according to any of the embodiments of the invention.
According to another aspect of the present invention, there is provided a computer-readable storage medium storing computer instructions for causing a processor to implement the CAD graph processing method according to any one of the embodiments of the present invention when executed.
The technical scheme includes that lines forming a first CAD graph on a display interface are obtained, first parameters input by a user are obtained, lines with a target distance smaller than or equal to the first parameters in the first CAD graph are virtually combined according to the first parameters to obtain a second CAD graph, the mapping relation between a topological face and a topological ring of the second CAD graph is obtained, the topological face of the second CAD graph is screened according to the mapping relation between the topological face and the topological ring of the second CAD graph to obtain a third CAD graph, the mapping relation between the topological ring and the topological line of the third CAD graph and the mapping relation between the topological line and the topological point are obtained, and the topological line of the third CAD graph is screened according to the mapping relation between the topological ring and the topological line of the third CAD graph and the mapping relation between the topological line and the topological point to obtain the target CAD graph. According to the technical scheme of the embodiment of the invention, through establishing and updating the mapping relation between the general geometry and the entity geometry, the dirty geometry problem of the CAD graph caused by precision difference, modeling and other reasons among modeling software can be shielded, and the beneficial effect of outputting clean geometry suitable for grid generation requirements is achieved.
It should be understood that the statements in this section are not intended to identify key or critical features of the embodiments of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flowchart of a CAD graphic processing method according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a CAD graphic processing apparatus according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device implementing the CAD graph processing method according to the embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "target," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example one
Fig. 1 is a flowchart of a CAD graph processing method according to an embodiment of the present invention, which is applicable to a CAD graph processing scenario and can be executed by a CAD graph processing apparatus, which can be implemented in hardware and/or software, and can be integrated into any electronic device providing CAD graph processing functions. As shown in fig. 1, the method includes:
s101, obtaining lines forming the first CAD graph on the display interface.
In this embodiment, the display interface may be an interface for displaying a CAD graph, for example, a CAD (Computer Aided Design) drawing interface.
It is to be explained that the first CAD drawing may be a CAD model to be processed. In particular, the first CAD graphic may be a three-dimensional CAD model, and the first CAD graphic may be, for example, an airplane model.
In the actual operation process, the first CAD graph is imported into the parsing library, so that B-rep (Boundary Representation) topology information of the first CAD graph, that is, point, line, ring, and plane information of the first CAD graph can be parsed.
S102, acquiring a first parameter input by a user.
The first parameter may be a tolerance set by a user according to actual conditions. Specifically, the first parameter may be length information, tangent vector angle information, or length information plus tangent vector angle information.
Specifically, a first parameter input by a user is obtained, where the first parameter may be a tolerance set by the user according to an actual situation.
S103, performing virtual combination on lines of which the target distance is smaller than or equal to the first parameter in the first CAD graph according to the first parameter to obtain a second CAD graph.
Wherein the target distance may be a distance between lines in the first CAD drawing.
For example, the virtual merge may be to connect discontinuous lines to make them continuous, or to merge closely spaced lines into the same line.
The second CAD drawing refers to a CAD drawing obtained by virtually merging lines of the first CAD drawing.
Specifically, a first parameter input by a user is received, and a line with a target distance smaller than or equal to the first parameter in the first CAD graph is virtually merged according to length information and/or tangent vector angle information in the first parameter to obtain a second CAD graph. Illustratively, the first parameter may be ± 0.04 mm, i.e. lines within a distance of 0.04 mm may be virtually merged. After the virtual merging of the lines of the first CAD drawing, the corresponding face of the first CAD drawing may also change.
And S104, acquiring the mapping relation between the topological surface and the topological ring of the second CAD graph.
The topological surface comprises at least one topological ring, the topological ring is a two-dimensional graph formed on the basis of lines, and the topological surface is a two-dimensional graph formed on the basis of the topological ring.
It should be noted that the topological surface of the second CAD drawing may be a new surface formed by virtually merging the lines of the first CAD drawing. Specifically, the topology surface of the second CAD drawing includes a surface of the original first CAD drawing on which the virtual merging of the lines is not performed and a surface formed by virtually merging the lines of the first CAD drawing.
It should be explained that a face may comprise many rings, but only one boundary ring. The topological ring may be a ring included in a topological surface, i.e., a ring included in a new surface formed after virtual merging of lines on the first CAD drawing.
The mapping relationship between the topology surface and the topology ring refers to a corresponding relationship between the topology surface and the topology ring, and for example, one topology surface may be associated with a plurality of topology rings. The topological rings may be composed of topological lines, which are directional lines, and the corresponding topological rings are also directional. The topological ring can be composed of topological lines in the anticlockwise direction, and the right-hand law is met at the moment, namely the topological surface is ensured to be positioned on the left side of the topological lines forming the topological ring.
Specifically, after the lines of the first CAD graph are virtually combined according to the first parameters to obtain a second CAD graph, the surface and the ring of the second CAD graph are obtained, and the mapping relation between the topological surface and the topological ring of the second CAD graph is established.
The embodiment of the invention introduces a super-topology concept, establishes a data structure for connecting the super-topology and the real digital analogy B-rep, accesses the real digital analogy through a user-defined data structure, and performs all CAD graph repair operations and feature simplification operations related to the super-topology.
And S105, screening the topological surface of the second CAD graph according to the mapping relation between the topological surface and the topological ring of the second CAD graph to obtain a third CAD graph.
For example, the screening operation may be to delete the overlapped topology surfaces, to delete the redundant topology surfaces, or to fill up the missing surfaces between the topology surfaces.
It should be noted that the third CAD drawing refers to a CAD drawing obtained by performing a screening operation on the topology surface of the second CAD drawing.
Specifically, the topology surfaces overlapped by the second CAD graph are deleted according to the mapping relation between the topology surfaces and the topology rings of the second CAD graph, redundant topology surfaces are deleted, missing surfaces between the topology surfaces and the topology surfaces are filled, and a third CAD graph is obtained.
S106, obtaining the mapping relation between the topological rings and the topological lines of the third CAD graph and the mapping relation between the topological lines and the topological points.
It should be noted that the topological lines of the third CAD drawing may be new lines formed by screening the topological surface of the second CAD drawing. Specifically, the topological ring of the third CAD drawing includes a ring of an original second CAD drawing which is not subjected to screening and a ring formed after the topological surface of the second CAD drawing is screened, and the topological line of the third CAD drawing includes a line of the original second CAD drawing which is not subjected to screening and a line formed after the topological surface of the second CAD drawing is screened.
For example, the mapping relationship between the topological rings and the topological lines refers to the corresponding relationship between the topological rings and the topological lines, and for example, one topological ring may be associated with a plurality of topological lines.
Wherein the topological point of the third CAD graph can be a point on a topological line of the third CAD graph.
For example, the mapping relationship between the topology lines and the topology points refers to a corresponding relationship between the topology lines and the topology points, and for example, adjacent topology lines are associated with the same topology point, one topology point is associated with at least one topology line, and one topology line is associated with two topology points.
Specifically, after the topological surface of the second CAD graph is screened to obtain a third CAD graph, the mapping relation between the topological surface of the third CAD graph and the topological ring is updated, all the wires are traversed according to the topological ring information to create a topological line, and the mapping relation between the topological ring and the topological line of the third CAD graph and the mapping relation between the topological line and the topological point are established.
And S107, screening the topological lines of the third CAD graph according to the mapping relation between the topological rings and the topological lines of the third CAD graph and the mapping relation between the topological lines and the topological points to obtain a target CAD graph.
The screening operation may be to detect the quality of the topological lines according to preset conditions, and construct a new topological line to replace the original topological line with poor quality.
The target CAD drawing refers to a CAD drawing obtained by screening the topological lines of the third CAD drawing.
Specifically, according to the mapping relationship between the topological rings and the topological lines of the third CAD graph and the mapping relationship between the topological lines and the topological points, quality screening is performed on the topological lines of the third CAD graph, a new topological line is constructed to replace the original topological line with poor quality, and the target CAD graph is obtained.
In the actual operation process, after the original CAD graph is processed by the CAD graph processing method in the embodiment of the invention, better stress analysis can be performed on the processed CAD graph, such as lifting force, resistance and pressure analysis, and the like.
The technical scheme includes that lines forming a first CAD graph on a display interface are obtained, first parameters input by a user are obtained, lines with a target distance smaller than or equal to the first parameters in the first CAD graph are virtually combined according to the first parameters to obtain a second CAD graph, the mapping relation between a topological face and a topological ring of the second CAD graph is obtained, the topological face of the second CAD graph is screened according to the mapping relation between the topological face and the topological ring of the second CAD graph to obtain a third CAD graph, the mapping relation between the topological ring and the topological line of the third CAD graph and the mapping relation between the topological line and the topological point are obtained, and the topological line of the third CAD graph is screened according to the mapping relation between the topological ring and the topological line of the third CAD graph and the mapping relation between the topological line and the topological point to obtain the target CAD graph. According to the technical scheme of the embodiment of the invention, through establishing and updating the mapping relation between the general geometry and the entity geometry, the dirty geometry problem of the CAD graph caused by precision difference, modeling and other reasons among modeling software can be shielded, and the beneficial effect of outputting clean geometry suitable for grid generation requirements is achieved.
Optionally, the step of screening the topology surface of the second CAD graph according to the mapping relationship between the topology surface and the topology ring of the second CAD graph to obtain a third CAD graph includes:
and determining the area corresponding to the surface to be corrected according to the mapping relation between the topological surface and the topological ring of the second CAD graph and the first parameter, and displaying the area corresponding to the surface to be corrected on a CAD graph display interface.
It should be explained that the area corresponding to the surface to be corrected may be an area where defects exist on the topological surface of the second CAD drawing. Wherein, the area that the face that waits to rectify corresponds includes: the area corresponding to the coincidence plane and/or the area corresponding to the redundant plane.
Illustratively, the coincident surface refers to a topology surface where the second CAD graphic generates a coincidence, and the redundant surface refers to a topology surface that is redundant of the second CAD graphic. Specifically, the coincident faces and the redundant faces can be obtained according to discrete triangle detection.
The CAD graphic display interface can be an interface for displaying three-dimensional graphics by CAD software.
Specifically, according to the mapping relation between the topological surface of the second CAD graph and the topological ring, the overlapped surfaces and/or the redundant surfaces with the distance smaller than or equal to the first parameter are fused, the overlapped surfaces and/or the redundant surfaces larger than the first parameter are determined as the areas corresponding to the surfaces to be corrected, and the areas corresponding to the surfaces to be corrected are displayed on the CAD graph display interface, so that a user can determine whether to delete the overlapped surfaces and/or the redundant surfaces.
And when touch operation aiming at a target area in the CAD graph display interface is detected, deleting the surface to be corrected corresponding to the target area to obtain a third CAD graph.
It should be noted that the target area may refer to an area selected by the user and having a defect. Specifically, the target region may be a coincidence plane or an excess plane.
The touch operation may be a click operation of the user on the overlapped surface and/or the redundant surface.
Specifically, after the area corresponding to the surface to be corrected is displayed on the CAD graph display interface, if the touch operation of a user for a target area in the CAD graph display interface is detected, the topological surface of the target area is segmented, wherein the segmentation line can be specified by the user, and then the overlapped surface and/or redundant surface marks of the segmented topological surface are deleted, so that a third CAD graph is obtained.
Optionally, the surface to be corrected further includes: and (5) lacking the noodles.
Illustratively, missing faces refer to missing topology faces of the second CAD graphic. For example, the distance between adjacent at least one topology surface of the second CAD drawing may be greater than a first tolerance, i.e. a missing surface may exist between the at least one topology surface.
Correspondingly, screening the topology surface of the second CAD graph according to the mapping relation between the topology surface and the topological ring of the second CAD graph to obtain a third CAD graph, which comprises the following steps:
and obtaining the line forming the segment surface.
Wherein, the line forming the lacking surface can be the line of the adjacent topological surface around the lacking surface.
Specifically, the lines that form the adjacent topological faces around the defect face are obtained.
And constructing the target surface according to the lines forming the defect surface.
It should be noted that the target surface may be a surface instead of the absent surface, so that the absent surface is connected to the neighboring surrounding topological surface, and the surface of the second CAD graph becomes continuous and complete.
Specifically, a spline interpolation and fitting may be used to construct the target surface from the lines that make up the missing surface.
And replacing the lacking surface in the topological surface of the second CAD graph with the target surface to obtain a third CAD graph.
Specifically, the lacking surface in the topological surface of the second CAD graph is replaced by the target surface, so that the surface of the second CAD graph is changed continuously and completely, and the mapping relation between the topological surface and the topological ring is updated to obtain a third CAD graph.
Optionally, determining an area corresponding to the surface to be corrected according to the mapping relationship between the topological surface and the topological ring of the second CAD drawing and the first parameter, including:
and determining a first coincident surface set according to the mapping relation between the topological surface of the second CAD graph and the topological ring.
It should be noted that the first set of coincidence surfaces may be a set of topology surfaces where the second CAD graph has an overlap. In the actual operation process, the surfaces analyzed from the analysis library by the CAD graph cannot share the boundary.
Specifically, a set consisting of topology surfaces with overlapping second CAD graphs is determined according to the mapping relation between the topology surfaces and the topological rings of the second CAD graphs.
And fusing the coincident surfaces in the first coincident surface set according to the first parameter to obtain a second coincident surface set.
Wherein the merging operation may be merging the boundaries of the at least one overlapping topology surface having a distance less than or equal to the first parameter.
In this embodiment, the second set of blending surfaces refers to at least one overlapping topology surface whose distance has been blended is less than or equal to the first parameter, and may be at least one overlapping topology surface whose distance is greater than the first parameter.
Specifically, the coincident surfaces with the distance smaller than or equal to the first tolerance in the first coincident surface set are fused according to the first parameter, so that a second coincident surface set is obtained.
And determining a region corresponding to the surface to be corrected according to the second superposition surface set.
Specifically, the coincident surfaces in the first coincident surface set are fused according to the first parameter, and then the region corresponding to the surface to be corrected is determined according to the second coincident surface set.
Optionally, the screening the topological lines of the third CAD graph according to the mapping relationship between the topological rings and the topological lines and the mapping relationship between the topological lines and the topological points of the third CAD graph to obtain the target CAD graph includes:
and determining the quality information of each topological line of the third CAD graph according to the mapping relation between the topological ring and the topological line of the third CAD graph and the mapping relation between the topological line and the topological point.
In this embodiment, the quality of a new topological line obtained by screening the topological surface of the second CAD graph may be poor, and the quality information of each topological line needs to be detected.
Specifically, for example, each topological line of the third CAD graph is detected according to a mapping relationship between a topological ring and a topological line of the third CAD graph and a mapping relationship between a topological line and a topological point, and it is determined whether a situation with poor quality exists in the topological line of the third CAD graph, for example, a certain topological line has self-intersection, or a topological point on a certain topological line is not smooth.
And determining the topological line of which the quality information does not meet the preset condition as the line to be corrected.
The preset condition may be quality information of the topological line set by the user according to an actual situation. For example, there may be a case where there is no discontinuity in the topological line, or the points on the topological line should be smooth.
It should be noted that the line to be corrected may be a topological line that needs to be corrected and has quality information that does not satisfy a preset condition.
Specifically, the topological line whose quality information does not satisfy the preset condition is determined as a line to be corrected, and the line to be corrected may be, for example, a topological line with self-intersection or a topological line with unsmooth topological points.
And constructing a target line according to the points of the line to be corrected.
In this embodiment, the point of the line to be corrected may be an end point of both ends of the line to be corrected.
Wherein the target line may be a newly constructed topological line that is used to replace the line to be corrected.
Specifically, the target line may be constructed according to end points at two ends of the line to be corrected, so as to replace the line to be corrected. Illustratively, a B-spline curve fitting method may be employed to construct the target line.
And replacing the line to be corrected in the topological line of the third CAD graph with the target line to obtain the target CAD graph.
Specifically, the constructed target line is used for replacing a line to be corrected in the topological line of the third CAD graph, and the mapping relation between the topological ring and the topological line is updated to obtain the target CAD graph.
Optionally, the method further includes:
and acquiring a second parameter.
Wherein the second parameter comprises: length information and/or tangent vector angle information.
In this embodiment, the second parameter may be a tolerance set by the user according to actual conditions. Specifically, the second parameter may be length information, or tangent vector angle information, or length information plus tangent vector angle information.
Specifically, a second parameter is obtained, where the second parameter includes: length information and/or tangent vector angle information.
And fusing the topological lines of the target CAD graph according to the second parameters to obtain a target overtire.
Illustratively, the merging operation may be to divide the adjacent topological lines of the topological surfaces with different sizes and merge redundant topological lines according to the second parameter.
The target overtire may be a line that can be displayed to the user on the CAD graphical display interface and that the user can perform a clicking operation. Specifically, the target hyper-line may be created from a topological line of the target CAD graph.
Specifically, the topological lines of the target CAD graph are fused according to the second parameters to obtain a target overtire, and a mapping relation between the target overtire and the topological lines of the target CAD graph is established. The user can complete the selection operation of the corresponding area of the target CAD graph through the point selection operation of the target overtire.
And determining the end point of the target overtire as a target overtire.
Wherein, the end points of the target overtire refer to the end points at both ends of the target overtire.
The target over point may be a point that can be displayed to the user on the CAD graphical display interface and that the user can perform a pointing operation. In particular, the target waypoint may be created from the target waypoint.
Specifically, after the target beyond line is obtained, the beyond line direction is calculated to create a target beyond point, and a mapping relation between the target beyond point and the topological point of the target CAD graph is established. The user can complete the selection operation of the corresponding area of the target CAD graph through the clicking operation of the target over point.
The embodiment of the invention establishes two external operation interfaces of the overtire and the overtire, dynamically establishes the mapping relation between the supertopology and the real digital analogy according to the parameter setting of the user, and can realize the automatic processing of the dirty geometry problem of the real digital analogy.
The embodiment of the invention provides a CAD graph processing method, which realizes the virtual fusion of digital-analog points, the virtual segmentation, the virtual combination and the virtual fusion operation of digital-analog lines and the virtual combination operation of digital-analog surfaces by establishing and updating the mapping relation between general geometry and entity geometry, shields the dirty geometry problem of data on the entity geometry layer, can automatically eliminate unnecessary characteristics and outputs clean geometry suitable for grid generation requirements.
Example two
Fig. 2 is a schematic structural diagram of a CAD graph processing apparatus according to a second embodiment of the present invention. As shown in fig. 2, the apparatus includes: a first obtaining module 201, a second obtaining module 202, a virtual merging module 203, a third obtaining module 204, a first screening module 205, a fourth obtaining module 206, and a second screening module 207.
The first obtaining module 201 is configured to obtain a line forming a first CAD graph on a display interface;
a second obtaining module 202, configured to obtain a first parameter input by a user;
the virtual merging module 203 is configured to virtually merge lines, of which the target distance is smaller than or equal to the first parameter, in the first CAD graph according to the first parameter, so as to obtain a second CAD graph;
a third obtaining module 204, configured to obtain a mapping relationship between a topological ring and a topological surface of the second CAD graph, where the topological surface includes at least one topological ring, the topological ring is a two-dimensional graph formed based on a line, and the topological surface is a two-dimensional graph formed based on the topological ring;
the first screening module 205 is configured to screen a topology surface of the second CAD graph according to a mapping relationship between the topology surface and a topology ring of the second CAD graph to obtain a third CAD graph;
a fourth obtaining module 206, configured to obtain a mapping relationship between a topological ring and a topological line of the third CAD drawing, and a mapping relationship between a topological line and a topological point;
and the second screening module 207 is configured to screen the topological lines of the third CAD graph according to the mapping relationship between the topological rings and the topological lines of the third CAD graph and the mapping relationship between the topological lines and the topological points, so as to obtain a target CAD graph.
Optionally, the first filtering module 205 includes:
the processing unit is used for determining an area corresponding to a surface to be corrected according to the mapping relation between the topological surface and the topological ring of the second CAD graph and the first parameter, and displaying the area corresponding to the surface to be corrected on a CAD graph display interface, wherein the area corresponding to the surface to be corrected comprises: the area corresponding to the superposed surface and/or the area corresponding to the redundant surface;
and the deleting unit is used for deleting the surface to be corrected corresponding to the target area to obtain a third CAD graph when the touch operation aiming at the target area in the CAD graph display interface is detected.
Optionally, the surface to be corrected further includes: noodle deletion;
accordingly, the first filtering module 205 includes:
an acquisition unit configured to acquire a line constituting the absent surface;
a first constructing unit configured to construct a target surface from the lines constituting the absent surface;
and the first replacing unit is used for replacing the lacking surface in the topological surface of the second CAD graph with the target surface to obtain a third CAD graph.
Optionally, the processing unit is specifically configured to:
determining a first coincident surface set according to the mapping relation between the topological surface and the topological ring of the second CAD graph;
fusing coincident surfaces in the first coincident surface set according to the first parameter to obtain a second coincident surface set;
and determining a region corresponding to the surface to be corrected according to the second superposition surface set.
Optionally, the second screening module 207 includes:
the first determining unit is used for determining the quality information of each topological line of the third CAD graph according to the mapping relation between the topological ring and the topological line of the third CAD graph and the mapping relation between the topological line and the topological point;
the second determining unit is used for determining the topological line of which the quality information does not meet the preset condition as the line to be corrected;
the second construction unit is used for constructing a target line according to the point of the line to be corrected;
and the second replacing unit is used for replacing the line to be corrected in the topological line of the third CAD graph with the target line to obtain the target CAD graph.
Optionally, the apparatus further comprises:
a fifth obtaining module, configured to obtain a second parameter, where the second parameter includes: length information and/or tangent vector angle information;
the fusion module is used for fusing the topological lines of the target CAD graph according to the second parameters to obtain a target overtire;
and the determining module is used for determining the end point of the target overtire as a target overtire point.
The CAD graph processing device provided by the embodiment of the invention can execute the CAD graph processing method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
EXAMPLE III
FIG. 3 shows a schematic block diagram of an electronic device 30 that may be used to implement an embodiment of the invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 3, the electronic device 30 includes at least one processor 31, and a memory communicatively connected to the at least one processor 31, such as a Read Only Memory (ROM) 32, a Random Access Memory (RAM) 33, and the like, wherein the memory stores a computer program executable by the at least one processor, and the processor 31 may perform various suitable actions and processes according to the computer program stored in the Read Only Memory (ROM) 32 or the computer program loaded from the storage unit 38 into the Random Access Memory (RAM) 33. In the RAM 33, various programs and data necessary for the operation of the electronic apparatus 30 can also be stored. The processor 31, the ROM 32, and the RAM 33 are connected to each other via a bus 34. An input/output (I/O) interface 35 is also connected to bus 34.
A plurality of components in the electronic device 30 are connected to the I/O interface 35, including: an input unit 36 such as a keyboard, a mouse, or the like; an output unit 37 such as various types of displays, speakers, and the like; a storage unit 38 such as a magnetic disk, an optical disk, or the like; and a communication unit 39 such as a network card, modem, wireless communication transceiver, etc. The communication unit 39 allows the electronic device 30 to exchange information/data with other devices via a computer network such as the internet and/or various telecommunication networks.
The processor 31 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 31 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, or the like. The processor 31 performs the various methods and processes described above, such as the CAD graphics processing method:
obtaining a line forming a first CAD graph on a display interface;
acquiring a first parameter input by a user;
performing virtual combination on lines with the target distance smaller than or equal to the first parameter in the first CAD graph according to the first parameter to obtain a second CAD graph;
acquiring a mapping relation between a topological surface of the second CAD graph and a topological ring, wherein the topological surface comprises at least one topological ring, the topological ring is a two-dimensional graph formed on the basis of lines, and the topological surface is a two-dimensional graph formed on the basis of the topological ring;
screening the topological surface of the second CAD graph according to the mapping relation between the topological surface of the second CAD graph and the topological ring to obtain a third CAD graph;
acquiring the mapping relation between the topological rings and the topological lines of the third CAD graph and the mapping relation between the topological lines and the topological points;
and screening the topological lines of the third CAD graph according to the mapping relation between the topological rings and the topological lines of the third CAD graph and the mapping relation between the topological lines and the topological points to obtain a target CAD graph.
In some embodiments, the CAD graphics processing method may be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 38. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 30 via the ROM 32 and/or the communication unit 39. When the computer program is loaded into RAM 33 and executed by processor 31, one or more steps of the CAD graphics processing method described above may be performed. Alternatively, in other embodiments, the processor 31 may be configured to perform the CAD graphics processing method by any other suitable means (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. A computer program can execute entirely on a machine, partly on a machine, as a stand-alone software package partly on a machine and partly on a remote machine or entirely on a remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the Internet.
The computing system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical host and VPS service are overcome.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A CAD graph processing method, comprising:
acquiring a line forming a first CAD graph on a display interface;
acquiring a first parameter input by a user;
performing virtual combination on lines with a target distance smaller than or equal to the first parameter in the first CAD graph according to the first parameter to obtain a second CAD graph, wherein the target distance is the distance between lines in the first CAD graph;
acquiring a mapping relation between a topological surface of the second CAD graph and a topological ring, wherein the topological surface comprises at least one topological ring, the topological ring is a two-dimensional graph formed on the basis of lines, and the topological surface is a two-dimensional graph formed on the basis of the topological ring;
and performing first screening on the topological surface of the second CAD graph according to the mapping relation between the topological surface and the topological ring of the second CAD graph to obtain a third CAD graph, wherein the first screening operation comprises the following steps: deleting or replacing a missing surface in the topological surface of the second CAD graph by an area corresponding to a surface to be corrected in the topological surface of the second CAD graph, wherein the surface to be corrected is the topological surface with defects in the second CAD graph, or the surface to be corrected comprises: coincident faces and/or redundant faces;
acquiring the mapping relation between the topological rings and the topological lines of the third CAD graph and the mapping relation between the topological lines and the topological points;
and secondly, screening the topological lines of the third CAD graph according to the mapping relation between the topological rings and the topological lines of the third CAD graph and the mapping relation between the topological lines and the topological points to obtain a target CAD graph, wherein the second screening operation is to detect the quality of the topological lines according to preset conditions and replace the topological lines which do not meet the preset conditions.
2. The method of claim 1, wherein performing a first screening on the topology surface of the second CAD graph according to the mapping relationship between the topology surface and the topological ring of the second CAD graph to obtain a third CAD graph, comprises:
determining an area corresponding to a surface to be corrected according to the mapping relation between the topological surface of the second CAD graph and the topological ring and the first parameter, and displaying the area corresponding to the surface to be corrected on a CAD graph display interface, wherein the area corresponding to the surface to be corrected comprises: the area corresponding to the superposed surface and/or the area corresponding to the redundant surface;
and if the touch operation aiming at the target area in the CAD graph display interface is detected, deleting the surface to be corrected corresponding to the target area to obtain a third CAD graph.
3. The method of claim 2, wherein the surface to be corrected further comprises: noodle deletion;
correspondingly, the step of performing first screening on the topology surface of the second CAD graph according to the mapping relation between the topology surface and the topological ring of the second CAD graph to obtain a third CAD graph comprises the following steps:
obtaining a line forming the missing surface;
constructing a target surface according to the line forming the missing surface;
and replacing the lacking surface in the topological surface of the second CAD graph with the target surface to obtain a third CAD graph.
4. The method of claim 2, wherein determining the area corresponding to the surface to be corrected according to the mapping relationship between the topological surface and the topological ring of the second CAD drawing and the first parameter comprises:
determining a first coincident surface set according to the mapping relation between the topological surface of the second CAD graph and the topological ring;
fusing coincident surfaces in the first coincident surface set according to the first parameter to obtain a second coincident surface set;
and determining a region corresponding to the surface to be corrected according to the second superposition surface set.
5. The method according to claim 1, wherein performing a second screening on the topological lines of the third CAD drawing according to the mapping relationship between the topological rings and the topological lines and the mapping relationship between the topological lines and the topological points of the third CAD drawing to obtain a target CAD drawing, includes:
determining the quality information of each topological line of the third CAD graph according to the mapping relation between the topological ring and the topological line of the third CAD graph and the mapping relation between the topological line and the topological point;
determining the topological line of which the quality information does not meet the preset condition as a line to be corrected;
constructing a target line according to the points of the line to be corrected;
and replacing the line to be corrected in the topological line of the third CAD graph with the target line to obtain a target CAD graph.
6. The method of claim 1, further comprising:
acquiring a second parameter, wherein the second parameter comprises: length information and/or tangent vector angle information;
fusing the topological lines of the target CAD graph according to the second parameters to obtain a target overtire;
and determining the end point of the target overtire as a target overtire.
7. A CAD image processing apparatus, comprising:
the first acquisition module is used for acquiring lines forming a first CAD graph on a display interface;
the second acquisition module is used for acquiring a first parameter input by a user;
the virtual combination module is used for carrying out virtual combination on lines with the target distance smaller than or equal to the first parameter in the first CAD graph according to the first parameter to obtain a second CAD graph, wherein the target distance is the distance between lines in the first CAD graph;
the third acquisition module is used for acquiring a mapping relation between a topological surface of the second CAD graph and a topological ring, wherein the topological surface comprises at least one topological ring, the topological ring is a two-dimensional graph formed on the basis of lines, and the topological surface is a two-dimensional graph formed on the basis of the topological ring;
the first screening module is used for performing first screening on the topology surface of the second CAD graph according to the mapping relation between the topology surface and the topology ring of the second CAD graph to obtain a third CAD graph, wherein the first screening operation comprises the following steps: deleting or replacing a missing surface in the topology surface of the second CAD graph by an area corresponding to a surface to be corrected in the topology surface of the second CAD graph, wherein the surface to be corrected is the topology surface with defects in the second CAD graph, or the surface to be corrected comprises: coincident faces and/or redundant faces;
the fourth obtaining module is used for obtaining the mapping relation between the topological rings and the topological lines of the third CAD graph and the mapping relation between the topological lines and the topological points;
and the second screening module is used for carrying out second screening on the topological lines of the third CAD graph according to the mapping relation between the topological rings and the topological lines of the third CAD graph and the mapping relation between the topological lines and the topological points to obtain a target CAD graph, wherein the second screening operation is used for detecting the quality of the topological lines according to preset conditions and replacing the topological lines which do not meet the preset conditions.
8. The apparatus of claim 7, wherein the first screening module comprises:
the processing unit is used for determining an area corresponding to a surface to be corrected according to the mapping relation between the topological surface and the topological ring of the second CAD graph and the first parameter, and displaying the area corresponding to the surface to be corrected on a CAD graph display interface, wherein the area corresponding to the surface to be corrected comprises: the area corresponding to the coincidence plane and/or the area corresponding to the redundant plane;
and the deleting unit is used for deleting the surface to be corrected corresponding to the target area to obtain a third CAD graph when the touch operation aiming at the target area in the CAD graph display interface is detected.
9. An electronic device, characterized in that the electronic device comprises:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the CAD graph processing method of any of claims 1-6.
10. A computer-readable storage medium storing computer instructions for causing a processor to implement the CAD graphics processing method of any of claims 1-6 when executed.
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