CN114117568A - Parameterized cheongsam plate making method based on arc fitting curve - Google Patents
Parameterized cheongsam plate making method based on arc fitting curve Download PDFInfo
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Abstract
The invention discloses a parameterized cheongsam plate making method based on an arc fitting curve, which comprises the following steps of: analyzing an initial sample plate according to the curvature characteristics of the curve in the female cheongsam original structure diagram, and approximating and fitting the curve in the initial sample plate by adopting a proper circular arc; analyzing and extracting characteristic parameters and establishing a mathematical model of the characteristic parameters and linkage parameter constraint relation; extracting characteristic points, connecting the characteristic points by adopting straight lines and circular arcs, and drawing a clothing template; constraining geometric topological relation and size relation by using a parameterization manager; the parameterization manager recalculates the mathematical model of the clothing template according to the latest personalized characteristic parameter value and the constraint information to generate a new cheongsam template graph with personalized size; the constructed cheongsam parameterized structural design model is interactively constructed by means of general engineering drawing software, can be compatible with other plate-making software, and can simplify the parameterized design of a modern cheongsam template compared with other parameterized cheongsam template preparation methods.
Description
Technical Field
The invention relates to the field of female cheongsam garment plate making technology and the like, in particular to a parameterized cheongsam plate making method based on a circular arc fitting curve.
Background
In actual production, cheongsam is in multi-aspect customization business, so that a single-size single cutting is required to be carried out based on the actual body size of a customer, and compared with other types of clothes, the cheongsam has higher requirements on intelligent and personalized template design technology. The personalized clothing template generation technology mainly comprises an artificial neural network-based template generation technology, a 3D human body and clothing template flattening technology and a parameterized template manufacturing technology. Because the generation of the pattern by the artificial neural network technology requires training a large amount of data and is limited to some simple styles, the method is difficult to be applied to the actual production link. The 3D template flattening technique has not been commonly used due to poor handling of the slack between the garment and the body and distortion problems with the unfolded 2-dimensional panel.
Unlike the two technologies, the parametric plate making technology has gained more and more attention in the field of personalized plate making of clothing in recent years. Parametric prototyping techniques can be divided into two categories based on the principle used, namely variable programming and parametric models based on size and geometric constraints, which are considered as a promising approach. Roche et al and Dojia Cai et al develop a parameterized cheongsam model based on size and geometric constraints based on a Visual basic platform, but the complicated programming work increases the difficulty in making the cheongsam template, which is not beneficial to the popularization of the method, and the method cannot adapt to the local adjustment of the clothes style, thereby limiting the application of the method in the actual production scene.
Disclosure of Invention
The invention aims to overcome the defects of high difficulty, low adaptability and the like of plate making in the prior art and provides a parameterized cheongsam plate making method based on an arc fitting curve.
The invention is realized by the following technical scheme: a parameterized Cheong-sam plate making method based on an arc fitting curve comprises the following steps:
s1: analyzing an initial sample plate according to the curvature characteristics of the curve in the female cheongsam original structure diagram, and approximating and fitting the curve in the initial sample plate by adopting a proper circular arc;
s2: analyzing and extracting characteristic parameters through a topological structure of a geometric object in the female cheongsam original structure chart and establishing a mathematical model of a constraint relation between the characteristic parameters and linkage parameters;
s3: extracting characteristic points from the original structure diagram of the female cheongsam, and drawing a clothing template by adopting straight lines and circular arcs to connect the characteristic points;
s4: using a geometric constraint tool in the parameterization manager to constrain the geometric topological relation among the graphic elements of the clothing pattern;
s5: utilizing a marking constraint tool and a parameterized expression in a parameterized manager to constrain the dimensional relationship between the graphic elements of the pattern of the clothing pattern;
s6: and the parameterization manager recalculates the mathematical model of the clothing template according to the latest personalized characteristic parameter values and the constraint information to generate a new cheongsam template graph with personalized size.
By the technical scheme, when the clothing template is manufactured for a customer, the initial template model is customized according to individual difference and individual requirements of the customer, and then the initial template model is corrected according to the actual size of each part of the customer.
In order to further realize the invention, the following arrangement mode is adopted: in step S1, the curvature of the curve in the original structural diagram of the female cheongsam is a rotation rate of a tangential direction angle to an arc length for a certain point on the curve, and is defined by differentiation, which indicates a degree of deviation of the curve from a straight line.
In order to further realize the invention, the following arrangement mode is adopted: the curvature characteristics of the curve are divided into a monotonic curvature curve and a non-monotonic curvature curve; that is, in step S1, the curvature of the curve is characterized by classifying the curve into a monotonic curvature curve and a non-monotonic curvature curve according to whether the curvature on a segment of the curve is monotonic.
In order to further realize the invention, the following arrangement mode is adopted: the suitable circular arc comprises any one of a single circular arc, a double circular arc and a multi-section circular arc. And adopting a single circular arc to approximate and fit the monotonic curvature curve, and adopting a double circular arc and a multi-section circular arc to fit the non-monotonic curvature curve.
In order to further realize the invention, the following arrangement mode is adopted: in step S2, the characteristic parameters are key measurement values of the human body or the garment, such as bust, waist circumference, length of the garment, length of the sleeves, etc.; the linkage parameters are human body attributes or position values among human body parts, such as the length of shoulder lines, the distance between the bust and the waist line and the like.
In order to further realize the invention, the following arrangement mode is adopted: in step S2, the mathematical model classifies the parameter constraints into differences, ratios, and linearity to express the constraint relationship between the characteristic parameters and the linkage parameters.
In order to further realize the invention, the following arrangement mode is adopted: in step S4, the parameterization manager is a parameterization function manager provided in the AutoCAD software, and the user can establish a size constraint relationship between the key parameter and the linkage parameter in the parameterization function manager by using a mathematical expression through establishing the key parameter in the parameterization function manager.
In order to further realize the invention, the following arrangement mode is adopted: in step S4, the geometric constraint tool is used to embody the constraint relationship between the entity parts in the graph, and is used to represent the topology of the pattern, and the geometric constraint relationship is as follows: g ═ V, E, where G is the constraint graph; v is a set of nodes represented by geometric entities, including straight lines, arcs, and the like; e is a set of edges represented by constraints including distance, angle, parallel, perpendicular, etc. The geometric constraint relationship is an implicit relationship and is automatically detected by an AutoCAD software system.
In order to further realize the invention, the following arrangement mode is adopted: in step S5, the labeling constraint tool includes a variable constraint and a constant constraint, where the variable constraint establishes a constraint relationship between the key parameter and the linkage parameter; constant constraints establish a constraint relationship between a key parameter and a constant.
In order to further realize the invention, the following arrangement mode is adopted: in step S6, the personalized feature parameter is the size of at least one part of the human body, and the parameterization manager then modifies the initial template pattern according to the size of the corresponding parts of the garment and the constraint information.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the method can standardize the design of the clothing seam contour line in the traditional cheongsam structure plate making process, improve the rationality and scientificity of the design of the clothing seam contour line, and solve the problem that the traditional cheongsam structure drawing process depends on experience seriously.
(2) The parameterization realization process of the template is based on the existing engineering drawing software, and the constructed parameterized constraint model of the cheongsam template can realize the rapid generation of the garment template with a specific size based on the input of the key body size of a customer.
(3) The method solves the problems that the two sides of the provincial road are not equal in length, the structural line where the provincial road is closed is not smooth and the like due to the fact that the traditional cheongsam drawing branch parts neglect the relevance among all parts and among all design elements during drawing; the problems that the lengths of butt joint lines of front and rear clothes bodies are not equal after butt joint, or the tangential directions of curves are not consistent, butt joint structural lines are not smooth and the like are solved.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Figure 2 is a drawing and block diagram of a classic cheongsam design.
Figure 3 is a graph of a line cut of a cheongsam panel.
Figure 4 is a drawing of a circular arc of a cheongsam template curve.
Fig. 5 is an explanatory diagram of a double arc and a triple arc.
Fig. 6 is an explanatory diagram of three typical double-circular drawing methods.
Fig. 7 is an explanatory diagram of a typical three-arc drawing.
Fig. 8 is a cheongsam parameterized structure model constraint tag diagram.
FIG. 9 is a diagram of a model for calculating the radius of a bi-arc by the centroidal method.
Fig. 10 is a diagram of a three-arc radius calculation model.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1:
the invention designs a parameterized cheongsam plate making method based on an arc fitting curve, which solves the defects of high plate making difficulty, poor adaptability and the like in the prior art and comprises the following steps:
s1: analyzing an initial sample plate according to the curvature characteristics of the curve in the female cheongsam original structure diagram, and approximating and fitting the curve in the initial sample plate by adopting a proper circular arc;
s2: analyzing and extracting characteristic parameters through a topological structure of a geometric object in the female cheongsam original structure chart and establishing a mathematical model of a constraint relation between the characteristic parameters and linkage parameters;
s3: extracting characteristic points from the original structure diagram of the female cheongsam, and drawing a clothing template by adopting straight lines and circular arcs to connect the characteristic points;
s4: using a geometric constraint tool in the parameterization manager to constrain the geometric topological relation among the graphic elements of the clothing pattern;
s5: utilizing a marking constraint tool and a parameterized expression in a parameterized manager to constrain the dimensional relationship between the graphic elements of the pattern of the clothing pattern;
s6: and the parameterization manager recalculates the mathematical model of the clothing template according to the latest personalized characteristic parameter values and the constraint information to generate a new cheongsam template graph with personalized size.
By the technical scheme, when the clothing template is manufactured for a customer, the initial template model is customized according to individual difference and individual requirements of the customer, and then the initial template model is corrected according to the actual size of each part of the customer.
Example 2:
the present embodiment is further optimized based on the above embodiment, and the same parts as those in the foregoing technical solution will not be described herein again, and further to better implement the present invention, the following setting manner is particularly adopted: in step S1, the curvature of the curve in the original structural diagram of the female cheongsam is a rotation rate of a tangential direction angle to an arc length for a certain point on the curve, and is defined by differentiation, which indicates a degree of deviation of the curve from a straight line.
Example 3:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to further better implement the present invention, the following setting modes are particularly adopted: the curvature characteristics of the curve are divided into a monotonic curvature curve and a non-monotonic curvature curve; that is, in step S1, the curvature of the curve is characterized by classifying the curve into a monotonic curvature curve and a non-monotonic curvature curve according to whether the curvature on a segment of the curve is monotonic.
Example 4:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to further better implement the present invention, the following setting modes are particularly adopted: the suitable circular arc comprises any one of a single circular arc, a double circular arc and a multi-section circular arc. And adopting a single circular arc to approximate and fit the monotonic curvature curve, and adopting a double circular arc and a multi-section circular arc to fit the non-monotonic curvature curve.
Example 5:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to further better implement the present invention, the following setting modes are particularly adopted: in step S2, the characteristic parameters are key measurement values of the human body or the garment, such as bust, waist circumference, length of the garment, length of the sleeves, etc.; the linkage parameters are human body attributes or position values among human body parts, such as the length of shoulder lines, the distance between the bust and the waist line and the like.
Example 6:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to further better implement the present invention, the following setting modes are particularly adopted: in step S2, the mathematical model classifies the parameter constraints into differences, ratios, and linearity to express the constraint relationship between the characteristic parameters and the linkage parameters.
Example 7:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to further better implement the present invention, the following setting modes are particularly adopted: in step S4, the parameterization manager is a parameterization function manager provided in the AutoCAD software, and the user can establish a size constraint relationship between the key parameter and the linkage parameter in the parameterization function manager by using a mathematical expression through establishing the key parameter in the parameterization function manager.
Example 8:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to further better implement the present invention, the following setting modes are particularly adopted: in step S4, the geometric constraint tool is used to embody the constraint relationship between the entity parts in the graph, and is used to represent the topology of the pattern, and the geometric constraint relationship is as follows: g ═ V, E, where G is the constraint graph; v is a set of nodes represented by geometric entities, including straight lines, arcs, and the like; e is a set of edges represented by constraints including distance, angle, parallel, perpendicular, etc. The geometric constraint relationship is an implicit relationship and is automatically detected by an AutoCAD software system.
Example 9:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to further better implement the present invention, the following setting modes are particularly adopted: in step S5, the labeling constraint tool includes a variable constraint and a constant constraint, where the variable constraint establishes a constraint relationship between the key parameter and the linkage parameter; constant constraints establish a constraint relationship between a key parameter and a constant.
Example 10:
the present embodiment is further optimized based on any of the above embodiments, and the same parts as those in the foregoing technical solutions will not be described herein again, and in order to further better implement the present invention, the following setting modes are particularly adopted: in step S6, the personalized feature parameter is the size of at least one part of the human body, and the parameterization manager then modifies the initial template pattern according to the size of the corresponding parts of the garment and the constraint information.
Example 11:
the embodiment of the method specifically describes a modern classic style cheongsam template as an example. The cheongsam structure chart is drawn by taking the model of 160/84A as an example, and referring to the reference measurement part of the national suit model GB/T1335.2-2008 'dress model woman', the net chest circumference B is set to be 840mm, the net waist circumference W is set to be 680mm, the net hip circumference H is set to be 900mm, the shoulder width S is set to be 380mm, the neck circumference N is set to be 380mm, the height is 1600mm, the length of the garment is 1100mm, and the style chart and the structure chart are shown in figure 2. The cheongsam based on the change of the modern classic cheongsam style can also adopt the method of the embodiment to carry out the parameterized template design:
as shown in fig. 1, the method for designing a parameterized template of the present invention comprises the following steps:
s1: dividing an original template curve and approximating by adopting an arc: analyzing an initial sample plate according to the curvature characteristics of the curve in the female cheongsam original structure diagram, and approximating and fitting the curve in the initial sample plate by adopting a proper circular arc;
in this embodiment, the curve in the cheongsam template is divided into a C-type curve and an S-type curve, wherein the S-type curve is divided into two segments of C-type curves. For the C-shaped curve in the cheongsam template, the C-shaped curve can be approximated by using a circular arc spline, and methods such as a single circular arc, a double circular arc, a three circular arc and the like can be mainly adopted. Before approximating the template curve with a circular arc, the cheongsam template curve needs to be segmented.
The cheongsam template curve segmentation is based on the basic principle that the arc approximation curve has the minimum error and the minimum number of arcs, and the sharp point and the inflection point of the curve in the cheongsam template are segmented by adopting a step-by-step segmentation strategy. As shown in fig. 3, firstly, taking the connection points of the straight line and the curve in the cheongsam back piece, namely B1, B2, B3, B5 and B9, as segmentation points, and preliminarily dividing the continuous curve into a back neck pit curve, a back armhole curve, a back shoulder curve, a back side seam curve and a back waist province curve; taking F1, F2, F3, F5, F6, F7 and F9 in the front panel as dividing points, and dividing continuous curves into an anterior fossa curve, a front sleeve gallery curve, a front side seam curve, a front waist dart curve and a front fly curve; c1, C3, C4, C5 and C6 in the collar piece are used as dividing points, and continuous curves in the collar piece are divided into an upper collar curve, a collar corner curve and a bottom collar curve; the continuous curves in the sleeve pieces are divided into sleeve top curves and sleeve bottom curves by taking S1, S9, S10 and S11 as dividing points. Since the rear side seam curve, the front side seam curve, the rear waist dart curve, the front waist dart curve, the sleeve top curve and the fly curve are all formed by S-shaped curves, the curve can be further divided into C-shaped curves.
When the front and rear side seam curves are divided, the inflection point position of the curve and the actual form of the curve in the structure chart are combined for comprehensive judgment, and meanwhile, in order to meet the principle that the fitted curve uses the least number of arcs, the front and rear side seam curves are finally divided into 4 sections of curves respectively by taking points B6, B7, B8 and F8, F9 and F10 as dividing points, as shown in FIG. 3. Wherein, each section of curve can be approximated by a single circular arc with monotonous curvature. Taking the rear panel side seam curve as an example, one side of arc B5B6 and arc B8B9 is tangent to the perpendicular line at point B6 and the perpendicular line at point B8, and arc B6B7 is tangent to arc B7B8 at point B7. Finally, the cheongsam side seam curve is planned to be an arc line consisting of 4 single arcs, as shown in fig. 4.
Due to the tight design of the modern cheongsam, the front waist and the back waist are often required to be processed into spindle-shaped curves with slightly enlarged centers when designing the structure in order to realize the fitness, and the waist-saving points are sharp, so the shape of the waist is fully considered when dividing the front waist and the back waist-saving curves. As shown in fig. 3, the front and rear waist provinces are divided into 4S-shaped curves according to points B10, B13, B14, B17, and points F15, F18, F19, and F22, respectively, and the S-shaped curves can be further divided into two C-shaped curves according to the positions of inflection points (B11, B12, B15, B16, F16, F17, F20, and F21) in the S-shaped curves. Since each section of the C-shaped curve has a monotonous curvature, a single circular arc can be used for approximation, and finally the cheongsam waist province curve is planned to be an arc line formed by 8 sections of single circular arcs, as shown in fig. 4.
The front and rear sleeve hill curves are both formed by one segment of S-shaped curve and are tangent at the sleeve hill vertex S5, the front and rear sleeve hill curves are firstly divided into two segments of C-shaped curves at the points S3 and S7 respectively, and the C-shaped curves after division cannot be fitted by a single circular arc with monotonous curvature by combining the modeling characteristics of the Cheong-sam sleeve hill curves, so that the 4 segments of C-shaped curves are further divided at the points S4, S2, S6 and S8, and finally the sleeve hill curve formed by 8 segments of C-shaped curves is formed as shown in FIG. 3. Because the precision requirement on the sleeve top curve is higher than that of the coat body curve in the cheongsam structure drawing process, any one segment of the segmented C-shaped curve needs to pass through two given end points and meet the corresponding control edge tangent direction, and the approximation of the curve cannot be realized based on a single circular arc, the segmented C-shaped curve is fitted by adopting double circular arcs finally, as shown in fig. 4.
The Chevron chevron curve is a style line which can be defined by self according to the style requirement, the Chevron line of the S shape is divided into 4 sections at points F12, F13 and F14, and each section of curve has monotonous curvature, so that a single circular arc is adopted for fitting.
In the C-shaped curves of the back shoulder curve, the sleeve bottom curve, the neck upper curve, the collar angle curve and the like in the sample plate, the back shoulder curve, the sleeve bottom curve, the neck upper curve and the collar angle curve can be fitted by a single circular arc due to the monotonous curvature. The back neck pit curve, the front neck pit curve, the bottom neck curve and the like are suitable for fitting the curves by adopting double arcs because the two given end points are required to pass through and the tangent directions of the corresponding control edges are met. The posterior arm hole curve and the anterior arm hole curve cannot be drawn by adopting a section of double circular arc due to special curve modeling, so that the posterior arm hole curve and the anterior arm hole curve need to be further divided into two sections of C-shaped curves. In the same way, each section of C-shaped curve needs to pass through two given end points and meet the tangential direction of the corresponding control edge, so that the curve is suitable to be fitted by adopting double arcs. In the actual fitting process, the approximation error of the bi-arc to the original curve is larger due to the overlarge difference of the lengths of the two control edges of the posterior armhole lower curve, so that the posterior armhole lower curve is finally fitted by adopting the tri-arc, as shown in fig. 4.
Combining the above considerations, the final cheongsam template curve arc planning situation is shown in table 1.
TABLE 1 cheongsam body curve arc planning description
S2: extracting the characteristic parameters of the initial template and establishing a mathematical model of the constraint relation between the characteristic parameters and the linkage parameters: analyzing and extracting characteristic parameters through a topological structure of a geometric object in the female cheongsam original structure chart and establishing a mathematical model of a constraint relation between the characteristic parameters and linkage parameters;
the characteristic parameters in this embodiment are key measurement values of a human body or a garment, wherein the human body measurement values include height, shoulder width, chest circumference, waist circumference, hip circumference and neck circumference; key measurements of a garment include garment length and sleeve length. The linkage parameters are human body attributes or position values among human body parts, such as the length of shoulder lines, the distance between the bust and the waist line and the like.
S3: extracting the characteristic points of the initial sample plate and drawing a sample plate graph by connecting the characteristic points by adopting a straight line and an arc: extracting characteristic points from the original structure diagram of the female cheongsam, and drawing a clothing template by adopting straight lines and circular arcs to connect the characteristic points;
the double arcs used for drawing the template in this embodiment are a pair of arcs tangent to the two control edges at the two end points, connected end to end and tangent to each other at the connection point, and have continuity of G1, as shown in fig. 5(a), OA and OB are control edges tangent to the two end points of the double arcs, respectively, and two arcs with radii of R1 and R2 are tangent at the Q point. The three arcs described in the invention are three arcs tangent to two control edges at two end points, connected end to end and tangent to each other at the connection point, and also have G1 continuity, as shown in FIG. 5(b), OE and OF are control edges tangent to two end points OF the three arcs respectively, two arcs with radii OF R3 and R4 are tangent at a point Q1, and two arcs with radii OF R4 and R5 are tangent at a point Q2. Because the included angles of the two control edges corresponding to the arcs in the cheongsam structure chart are mostly obtuse angles and right angles, the double arcs and the three arcs discussed in the invention are drawn under the condition that the included angles of the two control edges are obtuse angles and right angles.
The selection of the common tangent point directly affects the smoothness and approximation effect of the double-arc and three-arc approximation curves, so that the determination of the position of the common tangent point becomes the key for constructing complex arcs such as double arcs, three arcs, multiple arcs and the like. The method of drawing a typical bi-arc can be classified into an inner center point method, an average rotation angle method, and an average chord length method according to the position of the common tangent point of the bi-arc, as shown in fig. 6. Because the common tangent point of the double arcs drawn by the center point method is always positioned at the inner center of the triangle, the shape of the double arcs drawn by the center point method is more stable, and the double arcs are drawn by the center point method in the embodiment.
The three-arc in this embodiment has two common tangent points Q1 and Q2, as shown in fig. 7. The invention adopts a typical three-arc drawing method, namely drawing a three-arc under the condition OF known two control edges, firstly trisecting a longer control edge OE, bisecting a shorter control edge OF, connecting bisecting points M and N, and taking a point Q1 on MN to ensure that EM is MQ1 and the point Q1 is the first common tangent point in the three-arc. The Q2 point position can be determined by referring to a double-arc drawing method of a center point method, taking Q1N and NF as control edges and determining the center point of delta Q1NF to position the Q2 point position.
S4: setting the geometric constraint and the size constraint of the template graph: using a geometric constraint tool in the parameterization manager to constrain the geometric topological relation among the graphic elements of the clothing pattern; utilizing a marking constraint tool and a parameterized expression in a parameterized manager to constrain the dimensional relationship between the graphic elements of the pattern of the clothing pattern;
in the example, the cheongsam template is drawn in AutoCAD software based on a cheongsam template structure design principle and an arc planning diagram, then the geometric relation between a straight line and an arc in the template is automatically constrained by means of geometric constraint in a parameterization toolbar, and finally a parameter and a function expression are defined by a marking constraint tool and a parameterization manager in the parameterization toolbar, so that size correlation is generated between geometric objects. The size constraint aiming at the straight line can adopt tools such as horizontal, vertical and alignment in the marking constraint, and the angle between the lines can be constrained by adopting an angle tool; and (4) carrying out size constraint on the arc in the sample plate by adopting a radius method, and constraining the length of the radius of the arc by utilizing a radius tool in the marking constraint. Taking the labeling constraint of straight lines in front and back clothes bodies in the cheongsam parameterized structural model as an example, the setting conditions of parameters and function expressions are shown in the figure 8 and the table 2.
TABLE 2 cheongsam parameterized Structure model labeling constraints
Since the parameterized constraint of the single arc can be implemented by means of geometric constraint, it is not described in detail in this embodiment. And (3) constraining double arcs and triple arcs in the cheongsam clothes body parameterized structure model by adopting a radius constraint method. As shown in fig. 9, since the included angle between the two tangent lines of the bi-arc is divided into two cases, when the angle ACB is a right angle, knowing the side length of the triangle AC, CB and the angle α, the radius lengths corresponding to the bi-arc are respectively:
when the angle ACB is an obtuse angle, the following are:
when the three-arc is drawn according to the foregoing typical three-arc drawing method, as shown in fig. 10, knowing side lengths OE and OF, and points M, N being trisecting and bisecting points OF the side length OE and the side length OF, respectively, and an angle EOF ═ α (α is a right angle or an obtuse angle), a single-arc radius R1 therein can be calculated by equations (5), (6), (7):
the double-arc radius calculation method can be calculated by referring to the obtuse angle double-arc calculation method in the foregoing.
In this embodiment, representative anterior fossa arcs (two tangent edges are right angles), anterior armhole upper arcs (two tangent edges are obtuse angles) and posterior armhole lower arcs (three arcs) in the cheongsam parameterized structure model are selected as example to introduce the labeling constraint data of the arc radius. The radius constraint data of the front neck pit arc of the cheongsam are shown in a table 3, the radius constraint data of the upper arc of the front armhole are shown in a table 4, and the radius constraint data of the lower arc of the rear armhole are shown in a table 5.
TABLE 3 cheongsam front neck pit arc radius labeling constraint
TABLE 4 restriction of radius marking of upper arc line of cheongsam anterior armhole
TABLE 5 restriction of lower arc marking of back armhole of cheongsam
S5: importing new characteristic parameters and generating a new template graph: and through the input of the personalized characteristic parameters, the parameterization manager recalculates the constraint model according to the latest characteristic parameter values and constraint information to generate a new cheongsam template graph with personalized size.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A parameterized Cheong-sam plate making method based on a circular arc fitting curve is characterized in that: the method comprises the following steps:
s1: analyzing an initial sample plate according to the curvature characteristics of the curve in the female cheongsam original structure diagram, and approximating and fitting the curve in the initial sample plate by adopting a proper circular arc;
s2: analyzing and extracting characteristic parameters through a topological structure of a geometric object in the female cheongsam original structure chart and establishing a mathematical model of a constraint relation between the characteristic parameters and linkage parameters;
s3: extracting characteristic points from the original structure diagram of the female cheongsam, and drawing a clothing template by adopting straight lines and circular arcs to connect the characteristic points;
s4: using a geometric constraint tool in the parameterization manager to constrain the geometric topological relation among the graphic elements of the clothing pattern;
s5: utilizing a marking constraint tool and a parameterized expression in a parameterized manager to constrain the dimensional relationship between the graphic elements of the pattern of the clothing pattern;
s6: and the parameterization manager recalculates the mathematical model of the clothing template according to the latest personalized characteristic parameter values and the constraint information to generate a new cheongsam template graph with personalized size.
2. The parameterized cheongsam plate making method based on the arc fitting curve of claim 1, wherein: in step S1, the curvature of the curve in the original structure diagram of the female cheongsam is a rotation rate of a tangential direction angle to an arc length for a certain point on the curve, and is defined by differentiation.
3. The parameterized cheongsam plate making method based on the arc fitting curve of claim 1, wherein: the curvature characteristics of the curve are divided into a monotonic curvature curve and a non-monotonic curvature curve.
4. The parameterized cheongsam plate making method based on the arc fitting curve of claim 1, wherein: the suitable circular arc comprises any one of a single circular arc, a double circular arc and a multi-section circular arc.
5. The parameterized cheongsam plate making method based on the arc fitting curve of claim 1, wherein: in step S2, the characteristic parameter is a key measurement value of a human body or a garment, and the linkage parameter is a human body attribute or a position value between human body parts.
6. The parameterized cheongsam plate making method based on the arc fitting curve of claim 1, wherein: in step S2, the mathematical model divides the parameter constraints into differences, ratios, and linearities.
7. The parameterized cheongsam plate making method based on the arc fitting curve of claim 1, wherein: the parameterization manager is a self-contained parameterization function manager in the AutoCAD software, establishes key parameters in the parameterization function manager, and simultaneously establishes a size constraint relation between the key parameters and linkage parameters by adopting a mathematical expression.
8. The parameterized cheongsam plate making method based on the arc fitting curve of claim 1, wherein: the geometric constraint tool is used for embodying constraint relations among entity parts in the graph, and the geometric constraint relation formula is as follows: g = (V, E), where G is a constraint graph; v is a group of nodes represented by geometric entities, including straight lines and circular arcs; e is a set of edges, including distance, angle, parallel, perpendicular, represented by constraints.
9. The parameterized cheongsam plate making method based on the arc fitting curve of claim 1, wherein: the labeling constraint tool comprises variable constraints and constant constraints, wherein the variable constraints establish the constraint relation between the key parameters and the linkage parameters; constant constraints establish a constraint relationship between a key parameter and a constant.
10. The parameterized cheongsam plate making method based on the arc fitting curve of claim 1, wherein: the personalized characteristic parameter is the size of at least one part of the human body.
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| CN115854832A (en) * | 2022-11-18 | 2023-03-28 | 国网四川省电力公司达州供电公司 | Method for calculating included angle error of workpieces forming two-dimensional included angles |
| CN115854832B (en) * | 2022-11-18 | 2024-01-26 | 国网四川省电力公司达州供电公司 | Included angle error calculation method for workpieces with two-dimensional included angles |
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