CN110969625A - Sponge cutting graph display method based on Qt - Google Patents
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Abstract
The invention relates to a sponge cutting graph display method based on Qt, which comprises the following steps: step 1: acquiring a data list; step 2: preprocessing a data list; and step 3: calculating parameters of each graphic element in the cutting graph; and 4, step 4: drawing each graphic element in the cutting graph; and 5: setting a father class and a subclass; step 6: and displaying a cutting graph. The invention has the advantages that: the invention relates to a sponge cutting graph display method based on Qt, which comprises the steps of firstly obtaining typesetting file contents, preprocessing data, rejecting interference data in a typesetting file by a mathematical method according to the characteristics of the typesetting file data, and calculating various parameters of graph elements; the method has the advantages that the sponge cutting graph is displayed based on the Qt graph view frame, the straight line and the arc primitives are drawn, the straight line and the arc primitives are added into a scene and a view in sequence, the sponge cutting graph is displayed, the algorithm design is reasonable, the logic is clear, meanwhile, the adjustment of the feed position and the track tracking during processing are facilitated.
Description
Technical Field
The invention belongs to the field of sponge cutting and manufacturing, and particularly relates to a sponge cutting graph display method based on Qt.
Background
Before cutting the sponge, drawing a cutting graph by graph drawing software, and importing the cutting graph into numerical control software of a sponge cutting machine. When the number of cutting patterns is large, arranging the cutting patterns in an automatic typesetting mode, generating a typesetting file, and importing the typesetting file into a numerical control software cutting sponge.
The typesetting file can not be directly used for sponge cutting, so that the typesetting file needs to be converted into a visual graph to be displayed in numerical control software, and the cutting feed position in the graph is adjusted according to the graph display result, thereby facilitating the generation of a processing file and the tracking of a processing track.
Disclosure of Invention
The invention aims to provide a Qt-based sponge cutting graph display method which can convert a typesetting file into a visual graph, restore a drawn cutting graph, facilitate adjustment of a cutting feed position and realize track tracking during processing.
In order to solve the technical problems, the technical scheme of the invention is as follows: a sponge cutting graph display method based on Qt is characterized in that: the method comprises the following steps:
step 1: acquiring a data list: confirming a workpiece coordinate system, analyzing the format of the typesetting file, confirming each parameter in the typesetting file, and reading the content of the typesetting file into a data list;
step 2: preprocessing the data list: using a programming language, changing the type of data in the data list, taking the interference data characteristics as conditions, inquiring the data list, and deleting the data list after finding;
and step 3: calculating parameters of each graphic element in the cutting graph;
and 4, step 4: drawing each graphic element in the cutting graph: drawing each graphic element in the corresponding cutting graph according to each parameter of the graphic element calculated in the step 3;
and 5: setting a parent class and a child class: setting a sponge cutting graph display scene QGraphicScene, a view QGraphicView and a graphic element QGraphicItem based on a Qt graph view frame, setting the whole graphic element as a parent class, and setting each element in the graphic element as a child class;
step 6: displaying a cutting graph: and (5) adding the whole primitive in the step (5) into a scene, and adding the scene into a view, thus finishing the sponge cutting graph display.
Further, each parameter in the composition file in the step 1 includes an abscissa and an ordinate corresponding to the start point coordinate of the cut pattern and the end point coordinate of the cut pattern, and a convexity of the cut pattern, where the convexity of the cut pattern is a tangent value of a quarter of the central angle.
Further, the step 3 of calculating parameters of each graphic element in the cutting graph specifically includes the following steps:
s1: calculating the chord length and chord vector angle of the cutting graph according to the starting point coordinate and the end point coordinate of the cutting graph, and further obtaining the convexity of the cutting graph;
s2: in the step S1, when the convexity is not equal to 0, the cutting pattern is an arc element, the center coordinates, the center angles, the radii and the arc start angles of the arc element are calculated, and the arc turning direction is determined;
s3: in step S1, when the crown is 0, the cutting pattern is a straight line element, and the inclination angle of the straight line element, that is, the cutter angle is calculated.
Further, drawing each graphic element in the cut graph in the step 4, specifically returning a straight line graphic element cLineItem or an arc graphic element cCircleItem according to each parameter of the graphic element calculated in the step 3; when the element is a straight line element, drawing a straight line according to the coordinates of the starting point and the ending point of the straight line; and when the arc element is the arc element, drawing the arc by selecting a drawing mode of the arc path, and drawing the arc by adopting a QPainterPath mode in Qt according to the starting point and the end point coordinates of the arc, the arc rotating direction, the arc starting point angle and the rotating angle.
Further, the interference data in step 2 includes data displayed multiple times adjacent to the same data and the same point in the data list.
The invention has the advantages that: the invention relates to a sponge cutting graph display method based on Qt, which comprises the steps of firstly obtaining typesetting file contents, preprocessing data, rejecting interference data in a typesetting file by a mathematical method according to the characteristics of the typesetting file data, and calculating various parameters of graph elements; the method has the advantages that the sponge cutting graph is displayed based on the Qt graph view frame, the straight line and the arc primitives are drawn, the straight line and the arc primitives are added into a scene and a view in sequence, the sponge cutting graph is displayed, the algorithm design is reasonable, the logic is clear, meanwhile, the adjustment of the feed position and the track tracking during processing are facilitated.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a flow chart of the present invention for computing a graphic element from a data list.
FIG. 2 is a flow chart of drawing graphics based on the Qt graphics view framework according to the present invention.
FIG. 3 is a diagram showing the effect of the sponge cutting pattern according to the embodiment.
Detailed Description
The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
Examples
The sponge cutting graph display method based on Qt in the embodiment, as shown in FIG. 1, includes the following steps:
step 1: acquiring a data list: confirming a workpiece coordinate system, analyzing the format of a typesetting file, confirming each parameter in the typesetting file, wherein each parameter comprises an abscissa and an ordinate corresponding to a starting point coordinate of a cutting graph and an end point coordinate of the cutting graph and the convexity of the cutting graph, the convexity of the cutting graph is a tangent value of a quarter of a central angle, and the content of the typesetting file is read into a data list;
step 2: preprocessing the data list: using a programming language, changing the type of data in the data list, taking the characteristics of interference data as conditions, inquiring the data list, and deleting adjacent same data and data displayed for multiple times at the same point in the data list after finding;
and step 3: calculating parameters of each graphic element in the cutting graph, and specifically comprising the following steps:
s1: calculating the chord length and chord vector angle of the cutting graph according to the starting point coordinate and the end point coordinate of the cutting graph, and further obtaining the convexity of the cutting graph;
s2: in the step S1, when the convexity is not equal to 0, the cutting pattern is an arc element, the center coordinates, the center angles, the radii and the arc start angles of the arc element are calculated, and the arc turning direction is determined;
s3: in step S1, when the convexity is 0, the cutting pattern is a straight line element, and the inclination angle of the straight line element, that is, the cutting tool angle is calculated;
and 4, step 4: drawing each graphic element in the cut graph, and returning a straight line graphic element cLineItem or an arc graphic element cCircLeItem according to each parameter of the graphic element calculated in the step 3 as shown in FIG. 2; when the element is a straight line element, drawing a straight line according to the coordinates of the starting point and the ending point of the straight line; when the arc element is the arc element, drawing an arc by selecting a drawing mode of an arc path, and drawing the arc by adopting a QPainterPath mode in Qt according to a starting point coordinate, an end point coordinate, an arc rotating direction, an arc starting point angle and a rotating angle of the arc;
and 5: setting a parent class and a child class: setting a sponge cutting graph display scene QGraphicScene, a view QGraphicView and a graphic element QGraphicItem based on a Qt graph view frame, setting the whole graphic element as a parent class, and setting each element in the graphic element as a child class;
step 6: displaying a cutting graph: and (5) adding the whole primitive in the step 5 into a scene, and adding the scene into a view, so as to finish the sponge cutting graph display as shown in fig. 3.
The specific steps of the method for displaying the graph of the cut sponge based on Qt of the present invention are described in detail below with reference to the ladder diagram in FIG. 3 as an example, as follows:
step 1: reading the ladder diagram typesetting file, and obtaining a ladder diagram related data list named data _ list: confirming a workpiece coordinate system, wherein the QGraphic View view class in the Qt is based on a Cartesian coordinate system; the typesetting file is an hmd format file, and the data list comprises 3 rows of data which are respectively an abscissa, an ordinate and a convexity; the cutting graph is composed of straight line elements or circular arc elements, the cutting graph is a continuous closed graph, so that the end point of a certain cutting element is the starting point of the next cutting element, every two adjacent lines of data in the data list form the starting point coordinate and the end point coordinate of the element in the cutting graph, and the convexity of the line where the end point coordinate is located is the corresponding convexity of the graph element; the convexity of the line on which the starting point coordinate is positioned is the corresponding convexity of the previous graphic element.
Taking the first straight line and the first circular arc in the ladder diagram of fig. 3 as examples, reading the data _ list from the typesetting file, wherein the data length units are all mm. Determining the directions of an X axis and a Y axis according to a right-hand spiral rule; the data _ list content is as follows:
data_list＝[[‘1843.786957’,‘0.000000’,‘0.0000000000’],
‘1843.786957’,‘0.000000’,‘0.0000000000’],
‘1843.786957’,‘0.000000’,‘0.0000000000’],
‘1783.929814’,‘0.000000’,‘0.0000000000’],
‘1783.929814’,‘0.000000’,‘0.0000000000’],
‘1783.929814’,‘0.000000’,‘0.0000000000’],
‘1783.929814’,‘0.000000’,‘0.0000000000’],
‘1528.933776’,‘0.000000’,‘-0.3975921079’],
‘1528.933776’,‘0.000000’,‘0.0000000000’]]
as shown above, the data list is a two-dimensional list, each row containing three columns, the first column being the abscissa, the second column being the ordinate, and the third column being the convexity.
Step 2: preprocessing the data list: the method comprises the steps of using a Python programming language, changing the format of a data type in a data list by using an np. Wherein np is the Numpy library abbreviation in Python; because the data of adjacent rows in the data list are completely the same, the data need to be deleted repeatedly, only one row is reserved, and the effect of deleting the repeated rows is achieved by adopting an itertools. Meanwhile, data with the same horizontal coordinates and the same vertical coordinates and different convexities of adjacent rows exist in the data list, the data list is inquired by taking the characteristics of the interference data as conditions, and only the rows with the convexities not being 0 are reserved after the interference data are found and deleted. After the weight removal is finished, the list type is converted into the array type by an np.
Firstly, converting a data format, and changing the data format into an array floating point number type:
data_list＝[[1.84378696e+03 0.00000000e+00
0.00000000e+00]
[1.84378696e+03 0.00000000e+00 0.00000000e+00]
[1.84378696e+03 0.00000000e+00 0.00000000e+00]
[1.78392981e+03 0.00000000e+00 0.00000000e+00]
[1.78392981e+03 0.00000000e+00 0.00000000e+00]
[1.78392981e+03 0.00000000e+00 0.00000000e+00]
[1.78392981e+03 0.00000000e+00 0.00000000e+00]
[1.52893378e+03 0.00000000e+00-3.97592108e-01]
[1.52893378e+03 0.00000000e+00 0.00000000e+00]]
and then converted into a two-dimensional list type, so that the weight is conveniently removed:
data_list＝[[1843.786957 0.000000 0.0000000000],
[1843.786957 0.000000 0.0000000000],
[1843.786957 0.000000 0.0000000000],
[1783.929814 0.000000 0.0000000000],
[1783.929814 0.000000 0.0000000000],
[1783.929814 0.000000 0.0000000000],
[1783.929814 0.000000 0.0000000000],
[1528.933776 0.000000-0.3975921079],
[1528.933776 0.000000 0.0000000000]]
and (3) the data _ list has repetition, and a final data list is obtained after the data _ list is deleted by adopting the method:
data_list＝[[1843.786957 0.000000 0.0000000000],
[1783.929814 0.000000 0.0000000000]，
[1528.933776 0.000000-0.3975921079]]
observing a data list, wherein the convexity of the second line is equal to 0, which indicates that a straight line element is generated from the second line of the first line in the data list, and the convexity of the third line is equal to 0, which indicates that a circular arc element is generated from the third line of the second line in the data list; the first row (1843.786957,0.000000) is the straight line element start point coordinate, the second row (1783.929814,0.000000) is the straight line element end point coordinate, and is also the circular arc element start point coordinate; the third row of data (1528.933776, 0.000000) is the arc element endpoint coordinate.
And step 3: calculating parameters of each graphic element in the cutting graph; and calculating by adopting different methods according to different convexity in the data list. If the convexity is equal to 0, the straight line element is obtained, the cosine value is negated according to the ratio of the coordinate increment of the starting point to the distance between the two points, and the inclination angle of the straight line element, namely the angle of the cutting tool, is calculated and is used when a cutting graph is to be processed; if the convexity is not equal to 0, the circular arc element is a circular arc element, a central angle and a radius are calculated according to the relation between the convexity and the central angle, a circle center coordinate and a circular arc starting angle are calculated according to a geometric relation, the circular arc rotation direction is determined according to the positive and negative of the convexity, the convexity is positive, the circular arc rotation direction is defined as anticlockwise, and the circular arc rotation direction is clockwise on the contrary;
the first graphic element is a straight line, the length of the straight line is 59.8571 according to the coordinates of a starting point (1843.786957,0.000000) and the coordinates of an end point (1783.929814,0.000000), the increment of the starting point is-59.8571, the inverse cosine value is solved to be-1, the corresponding angle is pi, the inclination angle of the straight line is 180 degrees, and the angle of a cutting tool is 180 degrees;
the second graphic element is a circular arc, and according to the convexity-0.3975921079, the inverse tangent value is calculated to calculate that the central angle is 1.5137, the radius is 45.0, and the convexity is negative, so that the rotation direction of the circular arc is clockwise; drawing, according to the geometric relationship of the graphs, calculating the center coordinate (1528.9337,45.0) and the initial angle of the center to be-90.0.
And 4, step 4: drawing each graphic element in the cutting graph: and drawing each graphic element according to each parameter of the graphic elements calculated in the step 3.
(1) And defining a circular arc drawing function drawcle, drawing a circular arc by taking a graphic view frame path primitive QGraphic PathItem in starting point coordinates (x1, y1), circle center coordinates (dCenterX, dCentY), a circular arc radius R, a circular arc starting angle bta1, a circular center angle afa and Qt as function parameters, and taking the drawn circular arc primitive cCircleItem as a return. Functional form:
cCircleItem＝drawcle(x1,y1,dCenterX,dCenterY,R,bta1,afa，QGraphicsPathItem)
the method comprises the following steps:
s1 instantiating the QPainterPath draw Path class in Qt:
path＝QPainterPath()
s2, moving the drawing path starting point to the circular arc starting point (x1, y1) by using moveTo () function:
path.moveTo(x1,y1)
s3, drawing the circular arc by using the arcTo () function in QPainterPath:
arcto (rect, bta1, -afa) where rect represents the specified rectangular box.
And S4, instantiating a QGraphic PathItem graph view frame path primitive in the Qt, drawing a circular arc primitive cCircleItem, and taking the circular arc primitive cCircleItem as a return.
cCircleItem＝QGraphicsPathItem(path)
(2) Defining a drawing straight line function drawline, and drawing a graphic view frame straight line graphic primitive in the straight line starting point coordinates (x1, y1), the straight line end point coordinates (x2, y2) and Qt
And drawing a straight line by taking QGraphicsLineItm as a function parameter, and taking the drawn straight line primitive cLineItm as a return. Functional form:
cLineItem＝drawline(x1,y1,x2,y2,QGraphicsLineItem)
instantiate and take the straight circular arc as the return value directly:
cLineItem＝QGraphicsLineItem(x1,y1,x2,y2)
and 5: setting parent classes and subclasses.
And S1, instantiating a sponge cutting graph display scene QGramicsScene, a view QGramicsView and a graphic element QGramicsItem based on the Qt graph view frame. Setting a primitive QGraphicsItem in the instantiation Qt, namely the whole primitive as a parent class:
scene＝QGraphicsScene()
graphicsView＝QGraphicsView()
custitem＝QGraphicsItem()
and S2, setting each element in the graphic element into a subclass by adopting a setParentItem () method. And (4) synchronously setting when generating the straight line or the circular arc item in the step 4:
item.setParentItem(custitem)
step 6: displaying a cutting graph: adding the whole primitive in the step 5 into a scene by adopting an addItem () method in Qt: gene additem (costitem);
and adding the scene into the view by adopting a setScene () method:
setscene (scene), the sponge cutting graphical display can be completed.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A sponge cutting graph display method based on Qt is characterized in that: the method comprises the following steps:
step 1: acquiring a data list: confirming a workpiece coordinate system, analyzing the format of the typesetting file, confirming each parameter in the typesetting file, and reading the content of the typesetting file into a data list;
step 2: preprocessing the data list: using a programming language, changing the type of data in the data list, taking the interference data characteristics as conditions, inquiring the data list, and deleting the data list after finding;
and step 3: calculating parameters of each graphic element in the cutting graph;
and 4, step 4: drawing each graphic element in the cutting graph: drawing each graphic element in the corresponding cutting graph according to each parameter of the graphic element calculated in the step 3;
and 5: setting a parent class and a child class: setting a sponge cutting graph display scene QGraphicScene, a view QGraphicView and a graphic element QGraphicItem based on a Qt graph view frame, setting the whole graphic element as a parent class, and setting each element in the graphic element as a child class;
step 6: displaying a cutting graph: and (5) adding the whole primitive in the step (5) into a scene, and adding the scene into a view, thus finishing the sponge cutting graph display.
2. The Qt-based sponge cutting graphic display method according to claim 1, wherein: and (2) each parameter in the typesetting file in the step (1) comprises an abscissa and an ordinate corresponding to the start point coordinate of the cutting graph and the end point coordinate of the cutting graph and the convexity of the cutting graph, wherein the convexity of the cutting graph is a tangent value of a quarter of a central angle.
3. The Qt-based sponge cutting graphic display method according to claim 2, wherein: the step 3 of calculating the parameters of each graphic element in the cutting graph specifically comprises the following steps:
s1: calculating the chord length and chord vector angle of the cutting graph according to the starting point coordinate and the end point coordinate of the cutting graph, and further obtaining the convexity of the cutting graph;
s2: in the step S1, when the convexity is not equal to 0, the cutting pattern is an arc element, the center coordinates, the center angles, the radii and the arc start angles of the arc element are calculated, and the arc turning direction is determined;
s3: in step S1, when the crown is 0, the cutting pattern is a straight line element, and the inclination angle of the straight line element, that is, the cutter angle is calculated.
4. The Qt-based sponge cutting graphical display method according to claim 3, wherein: drawing each graphic element in the cut graph in the step 4, specifically returning a straight line graphic element cLineItem or an arc graphic element cCircleItem according to each parameter of the graphic element calculated in the step 3; when the element is a straight line element, drawing a straight line according to the coordinates of the starting point and the ending point of the straight line; and when the arc element is the arc element, drawing the arc by selecting a drawing mode of the arc path, and drawing the arc by adopting a QPainterPath mode in Qt according to the starting point and the end point coordinates of the arc, the arc rotating direction, the arc starting point angle and the rotating angle.
5. The Qt-based sponge cutting graphic display method according to claim 1, wherein: the interference data in the step 2 comprises adjacent same data and data displayed for multiple times at the same point in the data list.
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| CN113836652A (en) * | 2021-09-02 | 2021-12-24 | 西安近代化学研究所 | Python-based generation method of cross-sectional diagram of star-shaped solid propellant |
| CN115098083A (en) * | 2022-08-26 | 2022-09-23 | 广州市保伦电子有限公司 | Method, device and equipment for expanding graph view frame and storage medium |
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