CN109920029A - A method of drawing erasable figure - Google Patents
A method of drawing erasable figure Download PDFInfo
- Publication number
- CN109920029A CN109920029A CN201910203461.1A CN201910203461A CN109920029A CN 109920029 A CN109920029 A CN 109920029A CN 201910203461 A CN201910203461 A CN 201910203461A CN 109920029 A CN109920029 A CN 109920029A
- Authority
- CN
- China
- Prior art keywords
- drawing board
- coordinate points
- coordinate
- interim
- ink marks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Processing Or Creating Images (AREA)
Abstract
The present invention proposes a kind of method for drawing erasable figure, the following steps are included: opening the graphing function of whiteboarding software, select the figure of picture, global paintbrush mode field is set as the Graphic State for needing to paint, start to draw, the x and y coordinates pressed when by acquisition relative to the mouse pointer position of specified object, i.e., the coordinate (X of current dot system drawing board are being clicked on system drawing board, Y), record；The present invention first records the coordinate points during figure is drawn, then coordinate points instantiation is added to 2-d spatial coordinate set, two-dimensional space set coordinate points are added to drawing board ink marks set again, it is converted into ink marks and is added to interim drawing board, when erasing, the coordinate points needed at position need to be only wiped on interim drawing board, it is again coupled to adjacent coordinate points, figure after may make up erasing part, teacher is facilitated to wipe visuals to be explained in detail, and figure deletes part according to coordinate points, and more accurate, explanation is accurate.
Description
Technical field
The present invention relates to graphics process field more particularly to a kind of methods for drawing erasable figure.
Background technique
In teaching, with the development of intelligent multi-media equipment, teacher comes commonly using the drawing function of whiteboarding software
It does teaching and shows that this kind of functions are more convenient, and teacher can draw specific basic geometric figure at once, and can be according to teacher
Desired size draws out figure, and still, existing drawing function cannot be as using powder after drawing out figure on blackboard before
Stroke is such, is explained in detail with blackboard eraser erasing visuals or visuals deletion is inaccurate, cause explanation not
Enough accurate, therefore, the present invention proposes a kind of method for drawing erasable figure, to solve shortcoming in the prior art.
Summary of the invention
In view of the above-mentioned problems, the present invention first records the coordinate points during figure is drawn, then coordinate points instantiation is added
It is added to 2-d spatial coordinate set, then two-dimensional space set coordinate points are added to drawing board ink marks set, ink marks is converted into and adds
It is added to interim drawing board, when erasing, only need to wipe the coordinate points needed at position on interim drawing board, be again coupled to adjacent coordinate
Point, that is, the figure after may make up erasing part, facilitates teacher to wipe visuals to be explained in detail.
The present invention proposes a kind of method for drawing erasable figure, comprising the following steps:
Step 1: opening the graphing function of whiteboarding software, selects the figure of picture, and global paintbrush mode field is set as
The Graphic State for needing to paint；
Step 2: starting to draw, and the mouse pressed when by acquisition relative to specified object is being clicked on system drawing board
The x and y coordinates of pointer position are marked, i.e., the coordinate (X, Y) of current dot system drawing board is recorded；
Step 3: mobile paintbrush defines an interim drawing board, by the category of the attribute setup of interim drawing board and system drawing board
Property is the same；
Step 4: mobile paintbrush, one position of every movement obtains the coordinate (X, Y) of current dot system drawing board, makes current point
Figure is formed with starting point；
Step 5: obtaining the coordinate points for wanting graphing, arbitrarily takes the starting point a little for figure；
Step 6: the coordinate points set instantiation is added to inside the coordinate points of 2-d spatial coordinate set；
Step 7: being added to drawing board ink marks set for two-dimensional space set coordinate points, be converted into ink marks according to ink marks set,
Carry out the acquisition of sampling point formula, the specified point of acquisition figure；
Step 8: check whether ink marks sum is more than or equal to zero on interim drawing board, if so, removing the ink on interim drawing board
Then the ink marks converted in step 7 is added to interim drawing board by mark；
Step 9: when erasing, obtaining corresponding coordinate points according to the ink marks on interim drawing board, then to needing erasure location
The coordinate points at place are wiped, the figure after constituting erasing part, and are compared with coordinate points original on system drawing board.
Further improvement lies in that: in the step 1, it is the figure to be drawn that global paintbrush mode field, which is arranged, and according to wanting
The needs of picture shape set corresponding graphic variable function.
Further improvement lies in that: in the step 2, judges that main drawing board whether there is when mouse-up paintbrush and face
When drawing board, have and just remove interim drawing board, just do not skip.
Further improvement lies in that: in the step 2, record the coordinate information, mouse down and the seat of movement of mouse down
The coordinate information that mark series information, mouse flick.
Further improvement lies in that: in the step 3, the interim drawing board of definition is transparent color, the sightless picture of naked eyes
Plate, and the ink marks of interim drawing board is display, macroscopic ink marks.
Further improvement lies in that: in the step 5, obtain the coordinate points for wanting graphing, top of the coordinate points than figure
More the points of point, and the ending point in coordinate points is as the coordinate of starting point.
Further improvement lies in that: in the step 6, by the strongly-typed list of the object of index accesses, provide for pair
The coordinate points set instantiation is added to 2-d spatial coordinate set by the method that list is scanned for, sorts and operated
Coordinate points inside.
The invention has the benefit that the present invention first records the coordinate points during figure is drawn, then by coordinate points reality
Exampleization is added to 2-d spatial coordinate set, then two-dimensional space set coordinate points are added to drawing board ink marks set, is converted into ink
Mark is simultaneously added to interim drawing board, when erasing, only need to wipe the coordinate points needed at position on interim drawing board, be again coupled to adjacent
Coordinate points, that is, the figure after may make up erasing part facilitates teacher to wipe visuals and is explained in detail, and figure
Part is deleted according to coordinate points, more accurate, explanation is accurate, meanwhile, the figure behind the erasing part constituted on interim drawing board
Shape can be compared with coordinate points original on system drawing board, optimize teaching efficiency.
Specific embodiment
In order to realize invention technological means, reach purpose and effect is easy to understand, below with reference to specific implementation
Mode, the present invention is further explained.
The present embodiment proposes a kind of method for drawing erasable figure, comprising the following steps:
Step 1: opening the graphing function of whiteboarding software, selects the figure of picture, and global paintbrush mode field is set as
The Graphic State for needing to paint, and corresponding graphic variable function is set according to the needs of shape to be drawn, for example rectangle setting is entirely
Office's variable is Rectangle；
Step 2: starting to draw, and judges that main drawing board with the presence or absence of interim drawing board, has and just moves when mouse-up paintbrush
It except interim drawing board, does not just skip, the mouse pressed when by acquisition relative to specified object is being clicked on system drawing board
The x and y coordinates of pointer position, i.e., the coordinate (X, Y) of current dot system drawing board, are recorded, and record the coordinate letter of mouse down
The coordinate information that coordinate series information, the mouse of breath, mouse down and movement flick；
Step 3: mobile paintbrush defines an interim drawing board, the interim drawing board of definition be transparent color, naked eyes not
Visible drawing board, and the ink marks of interim drawing board is display, macroscopic ink marks, by the attribute setup and system of interim drawing board
The attribute of drawing board is the same；
Step 4: mobile paintbrush, one position of every movement obtains the coordinate (X, Y) of current dot system drawing board, makes current point
Figure is formed with starting point；
Step 5: obtain want graphing coordinate points, coordinate points than figure vertex more than a point, arbitrarily take a bit
For the starting point of figure, the ending point in coordinate points is as the coordinate of starting point, for rectangle, if the upper left corner is that starting point is sat
Mark is set as origin coordinates (X, Y), second point (X of transfer point, the Y-coordinate of starting point, thirdly (the coordinate X, Y of transfer point),
4th point (starting point X, transfer point Y), the 5th ending point coordinate and first starting point coordinate are the same；
Step 6: it by the strongly-typed list of the object of index accesses, provides for scanning for, sorting and grasping to list
The coordinate points set instantiation is added to inside the coordinate points of 2-d spatial coordinate set by the method for work；
Step 7: being added to drawing board ink marks set for two-dimensional space set coordinate points, be converted into ink marks according to ink marks set,
Carry out the acquisition of sampling point formula, the specified point of acquisition figure；
Step 8: check whether ink marks sum is more than or equal to zero on interim drawing board, if so, removing the ink on interim drawing board
Then the ink marks converted in step 7 is added to interim drawing board by mark；
Step 9: when erasing, obtaining corresponding coordinate points according to the ink marks on interim drawing board, then to needing erasure location
The coordinate points at place are wiped, the figure after constituting erasing part, and are compared with coordinate points original on system drawing board.
The present invention first records the coordinate points during figure is drawn, and coordinate points instantiation is then added to two-dimensional space and is sat
Mark set, then two-dimensional space set coordinate points are added to drawing board ink marks set, be converted into ink marks and are added to interim drawing board, it wipes
Except when, only the coordinate points needed at position need to be wiped on interim drawing board, be again coupled to adjacent coordinate points, that is, may make up erasing
Figure behind part facilitates teacher to wipe visuals and is explained in detail, and figure according to coordinate points come to partially deleting
It removes, more accurate, explanation is accurate, meanwhile, the figure behind the erasing part constituted on interim drawing board can be with original on system drawing board
The coordinate points come compare, and optimize teaching efficiency.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (7)
1. a kind of method for drawing erasable figure, which comprises the following steps:
Step 1: opening the graphing function of whiteboarding software, selects the figure of picture, and global paintbrush mode field is set as needing
The Graphic State of drawing；
Step 2: starting to draw, and refers to clicking the mouse pressed when by acquisition relative to specified object on system drawing board
The x and y coordinates of pin position, i.e., the coordinate (X, Y) of current dot system drawing board, are recorded；
Step 3: mobile paintbrush defines an interim drawing board, by the attribute one of the attribute setup of interim drawing board and system drawing board
Sample；
Step 4: mobile paintbrush, one position of every movement obtain the coordinate (X, Y) of current dot system drawing board, make current point and rise
Initial point forms figure；
Step 5: obtaining the coordinate points for wanting graphing, arbitrarily takes the starting point a little for figure；
Step 6: the coordinate points set instantiation is added to inside the coordinate points of 2-d spatial coordinate set；
Step 7: being added to drawing board ink marks set for two-dimensional space set coordinate points, be converted into ink marks according to ink marks set, carries out
The acquisition of sampling point formula, the specified point of acquisition figure；
Step 8: checking whether ink marks sum is more than or equal to zero on interim drawing board, if so, the ink marks on interim drawing board is removed,
Then the ink marks converted in step 7 is added to interim drawing board；
Step 9: when erasing, obtaining corresponding coordinate points according to the ink marks on interim drawing board, then to needing at erasure location
Coordinate points are wiped, the figure after constituting erasing part, and are compared with coordinate points original on system drawing board.
2. a kind of method for drawing erasable figure according to claim 1, it is characterised in that: in the step 1, if
Setting global paintbrush mode field is the figure to be drawn, and sets corresponding graphic variable function according to the needs of shape to be drawn.
3. a kind of method for drawing erasable figure according to claim 1, it is characterised in that: in the step 2,
Judge that main drawing board with the presence or absence of interim drawing board, has and just removes interim drawing board, just do not skip when mouse-up paintbrush.
4. a kind of method for drawing erasable figure according to claim 1, it is characterised in that: in the step 2, note
The coordinate information that coordinate information, mouse down and the coordinate of movement series information, the mouse of record mouse down flick.
5. a kind of method for drawing erasable figure according to claim 1, it is characterised in that: fixed in the step 3
The interim drawing board of justice is transparent color, the sightless drawing board of naked eyes, and the ink marks of interim drawing board is display, macroscopic
Ink marks.
6. a kind of method for drawing erasable figure according to claim 1, it is characterised in that: in the step 5, obtain
Take the coordinate points of desired graphing, coordinate points than figure vertex more than a point, and ending point and starting point in coordinate points
Coordinate it is the same.
7. a kind of method for drawing erasable figure according to claim 1, it is characterised in that: in the step 6, lead to
The strongly-typed list for crossing the object of index accesses, provides the method for scanning for, sorting and operating to list, will be arranged
Good coordinate points instantiation is added to inside the coordinate points of 2-d spatial coordinate set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910203461.1A CN109920029A (en) | 2019-03-18 | 2019-03-18 | A method of drawing erasable figure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910203461.1A CN109920029A (en) | 2019-03-18 | 2019-03-18 | A method of drawing erasable figure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109920029A true CN109920029A (en) | 2019-06-21 |
Family
ID=66965322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910203461.1A Pending CN109920029A (en) | 2019-03-18 | 2019-03-18 | A method of drawing erasable figure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109920029A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0061755A1 (en) * | 1981-03-30 | 1982-10-06 | BZ Plankenhorn KG | Computer-aided drawing apparatus |
| JPH0198074A (en) * | 1987-10-09 | 1989-04-17 | Sanyo Electric Co Ltd | Image plotting/erasing method |
| US5337404A (en) * | 1989-04-24 | 1994-08-09 | Digital Equipment International Limited | Process and system for making computer-aided drawings using a contour inclusion tree associated planar map data structure |
| CA2483943A1 (en) * | 1995-12-26 | 1997-07-10 | Imax Corporation | Computer-assisted animation construction system and method and user interface |
| JP2011039689A (en) * | 2009-08-07 | 2011-02-24 | Casio Computer Co Ltd | Graphic display device and program |
| CN102799315A (en) * | 2011-05-24 | 2012-11-28 | 程抒一 | Infrared touch screen accurate erasing system |
| CN103345389A (en) * | 2013-06-06 | 2013-10-09 | 百度在线网络技术（北京）有限公司 | Vector graph operating method and device applied to webpage |
| US20140088926A1 (en) * | 2012-09-27 | 2014-03-27 | Siemens Product Lifecycle Management Software Inc. | Virtual drafting tools |
| CN105373264A (en) * | 2015-09-07 | 2016-03-02 | 河北华发教育科技股份有限公司 | Dustproof infrared touch screen frame |
| CN106097414A (en) * | 2016-05-31 | 2016-11-09 | 福建天泉教育科技有限公司 | Curve method for deleting and system |
| WO2018103227A1 (en) * | 2016-12-08 | 2018-06-14 | 广州视源电子科技股份有限公司 | Method and device for drawing symmetrical figure |
| CN109407954A (en) * | 2018-09-11 | 2019-03-01 | 宁波思骏科技有限公司 | A kind of method for deleting and system of handwriting trace |
-
2019
- 2019-03-18 CN CN201910203461.1A patent/CN109920029A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0061755A1 (en) * | 1981-03-30 | 1982-10-06 | BZ Plankenhorn KG | Computer-aided drawing apparatus |
| JPH0198074A (en) * | 1987-10-09 | 1989-04-17 | Sanyo Electric Co Ltd | Image plotting/erasing method |
| US5337404A (en) * | 1989-04-24 | 1994-08-09 | Digital Equipment International Limited | Process and system for making computer-aided drawings using a contour inclusion tree associated planar map data structure |
| CA2483943A1 (en) * | 1995-12-26 | 1997-07-10 | Imax Corporation | Computer-assisted animation construction system and method and user interface |
| JP2011039689A (en) * | 2009-08-07 | 2011-02-24 | Casio Computer Co Ltd | Graphic display device and program |
| CN102799315A (en) * | 2011-05-24 | 2012-11-28 | 程抒一 | Infrared touch screen accurate erasing system |
| US20140088926A1 (en) * | 2012-09-27 | 2014-03-27 | Siemens Product Lifecycle Management Software Inc. | Virtual drafting tools |
| CN103345389A (en) * | 2013-06-06 | 2013-10-09 | 百度在线网络技术（北京）有限公司 | Vector graph operating method and device applied to webpage |
| CN105373264A (en) * | 2015-09-07 | 2016-03-02 | 河北华发教育科技股份有限公司 | Dustproof infrared touch screen frame |
| CN106097414A (en) * | 2016-05-31 | 2016-11-09 | 福建天泉教育科技有限公司 | Curve method for deleting and system |
| WO2018103227A1 (en) * | 2016-12-08 | 2018-06-14 | 广州视源电子科技股份有限公司 | Method and device for drawing symmetrical figure |
| CN109407954A (en) * | 2018-09-11 | 2019-03-01 | 宁波思骏科技有限公司 | A kind of method for deleting and system of handwriting trace |
Non-Patent Citations (3)
| Title |
|---|
| 任伟嘉等: "Android平板电脑无线控制的计算机演示系统", 《计算机工程与设计》 * |
| 杨海等: "空中交通监视电子地图平台设计", 《中国民航大学学报》 * |
| 桂斌: "非真实感绘制技术的研究", 《微计算机信息》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Coleman | " Digital inking": How to make perfect line drawings on computers | |
| DE60312572T2 (en) | Method and apparatus for converting digital images of hand drawings for further use in a structured text / graphics editor. | |
| CN107209633A (en) | Electronic information board device and method | |
| CN109407954B (en) | Writing track erasing method and system | |
| CN1229757C (en) | System and method for indexing and retrieval of record scanned from white board | |
| EP1901233A2 (en) | Techniques for image segment accumulation in document rendering | |
| CN109445676A (en) | The method of the handwritten stroke information of user's input is deleted on handwriting equipment | |
| CN103268166A (en) | Original handwriting information collecting and displaying method for handwriting input device | |
| CN108958455A (en) | Handwriting trace projecting method and device | |
| CN103488415A (en) | Handwritten text and graphic recognition system based on paper medium and recognition method | |
| CN101872715A (en) | Wafer defect marking system | |
| KR20210039360A (en) | Method, apparatus and electronic device for annotating information of structured document | |
| CN113485570B (en) | Multi-user writing method, device, computer readable storage medium and terminal equipment | |
| CN109543525B (en) | Table extraction method for general table image | |
| CN110362217A (en) | A kind of touth-interactive electronic blackboard blackboard eraser system and method for deleting | |
| CN103345389B (en) | The operational approach of a kind of vector graphics being applied to webpage and device | |
| CN112035035B (en) | Eraser realizing method and system capable of erasing strokes of top layer local area | |
| CN109509240A (en) | A kind of smart machine display methods, readable storage medium storing program for executing and smart machine | |
| CN101877067B (en) | Method and system for hand input based on camera device | |
| CN109920029A (en) | A method of drawing erasable figure | |
| CN210038810U (en) | Intelligent evaluation equipment and system | |
| CN112084103B (en) | Interface test method, device, equipment and medium | |
| CN207557895U (en) | A kind of equipment positioning device applied to large display screen curtain or projection screen | |
| CN113093938A (en) | Method and device for realizing writing and erasing simultaneously and terminal equipment | |
| US6430583B1 (en) | Scenario editing apparatus for performing editing of multimedia using figure feature points |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190621 |
|
| WD01 | Invention patent application deemed withdrawn after publication |