CN110806828B - Method and device for erasing PDF document content - Google Patents
Method and device for erasing PDF document content Download PDFInfo
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- CN110806828B CN110806828B CN201810872934.2A CN201810872934A CN110806828B CN 110806828 B CN110806828 B CN 110806828B CN 201810872934 A CN201810872934 A CN 201810872934A CN 110806828 B CN110806828 B CN 110806828B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000001960 triggered effect Effects 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 9
- 239000003086 colorant Substances 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 2
- 230000006870 function Effects 0.000 description 19
- 230000000977 initiatory effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000007723 transport mechanism Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
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Abstract
The embodiment of the application discloses a method and a device for erasing PDF document content, wherein the method can comprise the following steps: detecting a path of a cursor of a mouse in the PDF document after detecting that a function for erasing the content of the PDF document is started; drawing a Bezier curve in real time along with the extension of the path; the drawn Bezier curve is set to a preset color to erase the PDF document content passed by the path. By the embodiment, the content in the PDF document is conveniently erased, and a technical basis is provided for correcting the content of the PDF document.
Description
Technical Field
The embodiment of the application relates to a document processing technology, in particular to a method and a device for erasing PDF document contents.
Background
In the use process of PDF (portable document format) documents, there is generally content that needs to be deleted or corrected, and the existing PDF documents do not have the content deletion and correction functions yet.
Disclosure of Invention
In order to solve the technical problems, the embodiment of the application provides a method and a device for erasing PDF document contents, which can conveniently erase the contents in the PDF document and provide a technical basis for correcting the PDF document contents.
In order to achieve the purpose of the embodiment of the present application, the embodiment of the present application provides a method for erasing portable document format PDF document content, which may include:
detecting a path of a cursor of a mouse in the PDF document after detecting that a function for erasing the content of the PDF document is started;
drawing a Bezier curve in real time along with the extension of the path;
the drawn Bezier curve is set to a preset color to erase the PDF document content passed by the path.
Optionally, detecting a path of a cursor of the mouse in the PDF document includes:
detecting a preset path starting operation and a preset path ending operation;
taking the moving track of the cursor in the PDF document during the path start operation and the path end operation as a complete path of the cursor;
wherein movement of the cursor in a period in which the path start operation is detected and the path end operation is not detected is taken as extension of the path.
Optionally, the path initiation operation includes: pressing the left button of the mouse; the path ending operation includes: a release operation based on the pressing operation.
Optionally, drawing the bezier curve in real time as the path extends includes:
detecting coordinates of a cursor on a PDF document in real time along with the extension of the path;
and drawing a Bezier curve in real time according to the coordinates detected in real time.
Optionally, the method may further include: the thickness degree of the drawn lines of the Bezier curve is preset.
Optionally, the method may further include: detecting whether a preset menu key for erasing the content of the PDF document is triggered, and determining that a function for erasing the content of the PDF document is started when the menu key is triggered.
In order to achieve the object of the embodiment of the present application, the embodiment of the present application further provides an apparatus for erasing portable document format PDF document content, where the apparatus may include: the device comprises a detection module, a drawing module and a setting module;
the detection module is used for detecting the path of a cursor of a mouse in the PDF document after the function of erasing the content of the PDF document is detected to be started;
the drawing module is used for drawing a Bezier curve in real time along with the extension of the path;
and the setting module is used for setting the drawn Bezier curve to a preset color so as to erase the PDF document content passing through the path.
Optionally, the detecting module detecting a path of a cursor of the mouse in the PDF document includes:
detecting a preset path starting operation and a preset path ending operation;
taking the moving track of the cursor in the PDF document during the path start operation and the path end operation as a complete path of the cursor;
wherein movement of the cursor in a period in which the path start operation is detected and the path end operation is not detected is taken as extension of the path.
Optionally, the path initiation operation includes: pressing the left button of the mouse; the path ending operation includes: a release operation based on the pressing operation.
Optionally, the drawing module draws the bezier curve in real time along with the extension of the path includes:
detecting coordinates of a cursor on the PDF document in real time along with the extension of the path;
and drawing a Bezier curve in real time according to the coordinates detected in real time.
Optionally, the setting module is further configured to: the thickness degree of the drawn lines of the Bezier curve is preset.
Optionally, the detection module is further configured to: detecting whether a preset menu key for erasing PDF document content is triggered, and when the menu key is detected to be triggered, determining that a function for erasing PDF document content is started.
Compared with the prior art, the embodiment of the application comprises the following steps: detecting a path of a cursor of a mouse in the PDF document after detecting that a function for erasing the content of the PDF document is started; drawing a Bezier curve in real time along with the extension of the path; the drawn Bezier curve is set to a preset color to erase the PDF document content passed by the path. By the embodiment, the content in the PDF document is conveniently erased, and a technical basis is provided for correcting the content of the PDF document.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.
FIG. 1 is a flowchart of a method for erasing PDF document content according to an embodiment of the application;
FIG. 2 is a flowchart of a method for detecting a path of a cursor of a mouse in a PDF document according to an embodiment of the application;
FIG. 3 is a flow chart of a method for real-time drawing of Bezier curves with path extension according to an embodiment of the present application;
fig. 4 is a block diagram showing the constitution of an apparatus for erasing PDF document contents according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.
The steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, while a logical order is depicted in the flowchart, in some cases, the steps depicted or described may be performed in a different order than presented herein.
In order to achieve the object of the embodiment of the present application, the embodiment of the present application provides a method for erasing portable document format PDF document content, as shown in fig. 1, the method may include S101-S103:
s101, detecting a path of a cursor of a mouse in the PDF document after detecting that a function for erasing the content of the PDF document is started.
In the embodiment of the application, in order to erase the content in the PDF document, the user is required to select the content to be erased first, and specifically, the area, which is selected by the user and needs to delete the content, can be determined through the path through which the cursor passes when the user operates the mouse. Therefore, after the function of erasing the PDF document content is started, the path of the cursor can be detected to determine the area where the PDF content that the user wants to erase is located.
Alternatively, as shown in fig. 2, detecting a path of a cursor of a mouse in a PDF document may include S201 to S202:
s201, detecting a preset path starting operation and a preset path ending operation;
s202, taking a moving track of a cursor in a PDF document during a path start operation and a path end operation as a complete path of the cursor;
wherein movement of the cursor in a period in which the path start operation is detected and the path end operation is not detected is taken as extension of the path.
In the embodiment of the application, the path refers to a moving track undergone by a cursor when continuously moving from a starting point to an ending point. Based on this definition, the start point and end point at which the cursor is continuously moved after the function of erasing the contents of the PDF document is started can be detected. Specifically, the path start operation and the path end operation of the user may be detected, when the preset path start operation is detected, the position where the current cursor is located may be determined to be the start point of the path, and similarly, after the cursor starts to move from the start point (or does not move), if the preset path end operation is detected, the position where the current cursor is located may be determined to be the end point of the path.
In the embodiment of the application, the moving process of the cursor from the starting point to the ending point can be used as the extending process of the path.
Optionally, the path initiation operation may include: pressing the left button of the mouse; the path ending operation includes: a release operation based on the pressing operation.
In the embodiment of the application, when the user selects the content to be erased, the left mouse button can be pressed at the initial position, the cursor is dragged to pass through the area to be erased, and the left mouse button can be released after the cursor passes through the area to be erased, so that the current position of the mouse of the system is informed to be the end position, namely the current erasing operation is ended.
In other embodiments of the present application, other path start operations and path end operations may be used, for example, a left button of a dual mouse represents a path start operation, and a right button of a dual mouse represents a path end operation. The specific operation modes of the path start operation and the path end operation are not limited, and any operation can be adopted according to application scenes or requirements.
Optionally, the method may further include: detecting whether a preset menu key for erasing the content of the PDF document is triggered, and determining that a function for erasing the content of the PDF document is started when the menu key is triggered.
In the embodiment of the present application, in order to determine when to start the embodiment of the present application, a function starting device or a program for erasing the content of the PDF document may be preset, for example, a menu key for erasing the content of the PDF document may be preset in a menu of the PDF document, and when it is detected that the menu key is triggered, it may be determined that the embodiment of the present application needs to be started currently.
S102, drawing a Bezier curve in real time along with the extension of the path;
in the embodiment of the application, in the process of forming the path for deleting the PDF content through the cursor, a Bezier curve can be drawn on the PDF document along with the path, so that the area where the path passes through is covered by the line of the Bezier curve.
Alternatively, as shown in fig. 3, drawing the bezier curve in real time as the path extends may include S301-S302:
s301, detecting coordinates of a cursor on a PDF document in real time along with the extension of a path;
s302, drawing a Bezier curve in real time according to the coordinates detected in real time.
In the embodiment of the application, since each Bezier curve is a smooth curve drawn according to arbitrary point coordinates of four positions, an area covered by the Bezier curve can be drawn according to a large number of point coordinates. According to the principle, each coordinate point experienced by the cursor in the process of forming the path can be detected in real time, and a corresponding Bezier curve is drawn in real time according to each coordinate point on the whole path.
Optionally, the method may further include: the thickness degree of the drawn lines of the Bezier curve is preset.
In the embodiment of the application, in order to adapt to the application of the areas to be erased with different sizes, the function of adjusting the thickness degree of the lines of the Bezier curve can be set, so that a user can automatically adjust the thickness degree of the lines according to the sizes of the different areas or personal requirements.
In the embodiment of the application, when the line is thinner, the coverage area of the drawn Bezier curve is smaller, so that the area of erasable PDF document content is smaller; when the lines are thicker, the coverage of the drawn Bezier curve can be expanded, so that the PDF document content with a larger area can be erased.
S103, setting the drawn Bezier curve to a preset color so as to erase the PDF document content passing through the path.
Optionally, the method may further include: the color to which the bezier curve needs to be set is adjusted in advance.
In the embodiment of the application, in order to adapt to the application of the areas to be erased with different colors, the color adjusting function of the Bezier curve can be set, so that a user can automatically adjust the color of the line according to the background colors or personal requirements of different PDF documents, namely, the user can automatically adjust the preset color.
In the embodiment of the application, aiming at different background colors of the PDF document, the color of the Bezier curve can be set to be corresponding to the purpose of erasing the content of the PDF document.
In the embodiment of the application, when the background color of the PDF document is white and the font color is black, the color of the Bezier curve can be set to be white, so that the purpose of erasing the content of the PDF document is achieved by covering the black font of the path area by the white.
In the embodiment of the application, if the purpose of reminding is to be achieved (for example, reminding the user that the area has erased the related content or reminding the user that the area content needs to be corrected) on the basis of erasing the content of the PDF document, the color of the Bezier curve can be set to be a preset reminding color, and the reminding color is different from the background color of the PDF document, so that the user can clearly distinguish the PDF document. For example, when the background color of the PDF document is white and the font color is black, the alert color may be red or yellow. For the reminding color, a user can customize, and default colors can also be preset in a menu of the PDF document.
In the embodiment of the present application, in order to implement the above-mentioned reminding function, a reminding option may be set in advance in a menu of a PDF document, for example: deleting the reminder, correcting the reminder, etc., and providing corresponding color selection windows for different reminder options so that the user can define colors corresponding to the different reminder options.
In the embodiment of the application, the Bezier curve can be set to the preset color in real time in the drawing process, and the drawn Bezier curve can be uniformly set to the preset color after the path ending operation is executed.
According to the embodiment of the application, the content in the PDF document is conveniently erased, a technical basis is provided for correcting the content of the PDF document, different erasing colors and line thicknesses can be set, the requirements of adapting to different application scenes are met, and the user experience is further improved.
In order to achieve the purpose of the embodiments of the present application, the embodiments of the present application further provide a device 1 for erasing portable document format PDF document content, and it should be noted that any embodiment of the above method embodiments is applicable to the embodiment of the device, and will not be described herein in detail. As shown in fig. 4, the apparatus may include: a detection module 11, a drawing module 12 and a setting module 13;
a detection module 11, configured to detect a path of a cursor of a mouse in a PDF document after detecting that a function for erasing contents of the PDF document is started;
a drawing module 12, configured to draw a bezier curve in real time along with the path extension;
a setting module 13, configured to set the drawn bezier curve to a preset color, so as to erase the PDF document content passed by the path.
Optionally, the detecting module 11 detecting a path of a cursor of the mouse in the PDF document includes:
detecting a preset path starting operation and a preset path ending operation;
taking the moving track of the cursor in the PDF document during the path start operation and the path end operation as a complete path of the cursor;
wherein movement of the cursor in a period in which the path start operation is detected and the path end operation is not detected is taken as extension of the path.
Optionally, the path initiation operation includes: pressing the left button of the mouse; the path ending operation includes: a release operation based on the pressing operation.
Optionally, the drawing module 12 draws the bezier curve in real time along with the path extension includes:
detecting coordinates of a cursor on the PDF document in real time along with the extension of the path;
and drawing a Bezier curve in real time according to the coordinates detected in real time.
Optionally, the setting module 13 is further configured to: the thickness degree of the drawn lines of the Bezier curve is preset.
Optionally, the detection module is further configured to: detecting whether a preset menu key for erasing PDF document content is triggered, and when the menu key is detected to be triggered, determining that a function for erasing PDF document content is started.
Compared with the prior art, the embodiment of the application comprises the following steps: detecting a path of a cursor of a mouse in the PDF document after detecting that a function for erasing the content of the PDF document is started; drawing a Bezier curve in real time along with the extension of the path; the drawn Bezier curve is set to a preset color to erase the PDF document content passed by the path. By the embodiment, the content in the PDF document is conveniently erased, and a technical basis is provided for correcting the content of the PDF document.
Those of ordinary skill in the art will appreciate that all or some of the steps, systems, functional modules/units in the apparatus, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
Claims (10)
1. A method of erasing portable document format, PDF, document content, the method comprising:
detecting a path of a cursor of a mouse in the PDF document after detecting that a function for erasing the content of the PDF document is started;
drawing a Bezier curve in real time along with the extension of the path;
setting the drawn Bezier curve as a preset color to erase PDF document contents passing through the path;
the method further comprises the steps of: setting a reminding option, and adjusting the preset color of the Bezier curve to a reminding color according to the background color of the PDF document and the color of the fonts in the PDF document, so that the Bezier curve with the color being the reminding color covers the fonts in the PDF document passing by the path, thereby reminding a user that the PDF document passing by the path is subjected to erasing processing/needs to be corrected;
setting the Bezier curve as the reminding color in real time in the drawing process, or uniformly setting the drawn Bezier curve as the reminding color after the path ending operation is executed;
the reminding options comprise deleting reminding and correcting reminding, and corresponding color selection windows are provided for different reminding options, so that a user can define colors corresponding to different reminding options by the aid of the real-time color selection windows.
2. The method for erasing portable document format PDF document content of claim 1, wherein detecting a path of a cursor of a mouse in a PDF document comprises:
detecting a preset path starting operation and a preset path ending operation;
taking the moving track of the cursor in the PDF document during the path starting operation and the path ending operation as a complete path of the cursor;
wherein movement of the cursor in a period in which the path start operation is detected and the path end operation is not detected is taken as extension of the path.
3. The method of erasing portable document format PDF document content of claim 2, wherein the path start operation includes: pressing the left button of the mouse; the path ending operation includes: a release operation based on the pressing operation.
4. The method of erasing portable document format PDF document content of claim 1, wherein said drawing bezier curves in real time as said path extends comprises:
detecting coordinates of the cursor on the PDF document in real time along with the extension of the path;
and drawing the Bezier curve in real time according to the coordinates detected in real time.
5. The method for erasing portable document format PDF document content of claim 1, further comprising: the thickness degree of the drawn lines of the Bezier curve is preset.
6. The method for erasing portable document format PDF document content of claim 1, further comprising:
detecting whether a preset menu key for erasing PDF document content is triggered, and when the menu key is detected to be triggered, determining that the function for erasing PDF document content is started.
7. An apparatus for erasing portable document format, PDF, document content, the apparatus comprising: the device comprises a detection module, a drawing module and a setting module;
the detection module is used for detecting the path of a cursor of a mouse in the PDF document after the function of erasing the content of the PDF document is detected to be started;
the drawing module is used for drawing a Bezier curve in real time along with the extension of the path;
the setting module is used for setting the drawn Bezier curve to a preset color so as to erase the PDF document content passing through the path; the method is also used for setting a reminding option, and according to the background color of the PDF document and the color of the fonts in the PDF document, the preset color of the Bezier curve is adjusted to be a reminding color, so that the Bezier curve with the color being the reminding color covers the fonts in the PDF document passing by the path, and the purpose of reminding a user that the PDF document passing by the path is subjected to over-erasing processing/needs to be subjected to correction processing is achieved; setting the Bezier curve as the reminding color in real time in the drawing process, or uniformly setting the drawn Bezier curve as the reminding color after the path ending operation is executed, and reminding a user that related content is erased in a region where the Bezier curve passes/reminding the user that the content of the region needs to be corrected when the Bezier curve is set as the reminding color;
the reminding options comprise deleting reminding and correcting reminding, and corresponding color selection windows are provided for different reminding options, so that a user can define colors corresponding to different reminding options by the aid of the real-time color selection windows.
8. The apparatus for erasing portable document format PDF document content of claim 7 wherein said detection module detecting a path of a cursor of a mouse in a PDF document comprises:
detecting a preset path starting operation and a preset path ending operation;
taking the moving track of the cursor in the PDF document during the path starting operation and the path ending operation as a complete path of the cursor;
wherein movement of the cursor in a period in which the path start operation is detected and the path end operation is not detected is taken as extension of the path.
9. The apparatus for erasing portable document format PDF document content of claim 8, wherein the path start operation includes: pressing the left button of the mouse; the path ending operation includes: a release operation based on the pressing operation.
10. The apparatus for erasing portable document format PDF document content of claim 7, wherein said drawing module draws a bezier curve in real time as said path extends comprises:
detecting coordinates of the cursor on the PDF document in real time along with the extension of the path;
and drawing the Bezier curve in real time according to the coordinates detected in real time.
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