CN110806828A - Method and device for erasing PDF document content - Google Patents

Method and device for erasing PDF document content Download PDF

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Publication number
CN110806828A
CN110806828A CN201810872934.2A CN201810872934A CN110806828A CN 110806828 A CN110806828 A CN 110806828A CN 201810872934 A CN201810872934 A CN 201810872934A CN 110806828 A CN110806828 A CN 110806828A
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path
pdf document
erasing
content
cursor
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CN110806828B (en
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邓斌
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Beijing Kingsoft Office Software Inc
Zhuhai Kingsoft Office Software Co Ltd
Guangzhou Kingsoft Mobile Technology Co Ltd
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Beijing Kingsoft Office Software Inc
Zhuhai Kingsoft Office Software Co Ltd
Guangzhou Kingsoft Mobile Technology Co Ltd
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0487Interaction 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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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • User Interface Of Digital Computer (AREA)

Abstract

The embodiment of the invention discloses a method and a device for erasing PDF document contents, wherein the method comprises the following steps: detecting a path of a cursor of a mouse in a PDF document after detecting that a function of erasing the content of the PDF document is started; drawing a Bezier curve in real time along with the extension of the path; and setting the drawn Bezier curve as a preset color so as to erase the PDF document content passed by the path. By the scheme of the embodiment, the content in the PDF document can be conveniently erased, and a technical basis is provided for correcting the content of the PDF document.

Description

Method and device for erasing PDF document content
Technical Field
The embodiment of the invention 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 a PDF (portable document format) document, there are contents that need to be deleted or corrected, and the current PDF document does not have a content deletion and correction function.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention provide a method and an apparatus for erasing PDF document content, which can conveniently erase content in a PDF document and provide a technical basis for correcting PDF document content.
To achieve the purpose of the embodiment of the present invention, an embodiment of the present invention provides a method for erasing portable document format PDF document content, where the method may include:
detecting a path of a cursor of a mouse in a PDF document after detecting that a function of erasing the content of the PDF document is started;
drawing a Bezier curve in real time along with the extension of the path;
and setting the drawn Bezier curve as a preset color so as 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 starting operation and the ending operation of the path as the complete path of the cursor;
and taking the movement of the cursor in a period when the path starting operation is detected and the path ending operation is not detected as the extension of the path.
Optionally, the path initiation operation comprises: pressing a left mouse button; the path end operation includes: a releasing operation based on the pressing operation.
Optionally, the plotting in real-time the bezier curve as the path extends comprises:
detecting the 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 method may further include: the thickness of the line of the drawn bezier curve is set in advance.
Optionally, the method may further include: whether a preset menu key for erasing the content of the PDF document is triggered is detected, and when the menu key is triggered, the function of erasing the content of the PDF document is determined to be started.
In order to achieve the purpose of the embodiment of the present invention, an embodiment of the present invention 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 detecting the starting of the function of erasing the content of the PDF document;
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 as a preset color so as to erase the PDF document content passed by the path.
Optionally, the detecting module detects a path of a cursor of the mouse in the PDF document, including:
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 starting operation and the ending operation of the path as the complete path of the cursor;
and taking the movement of the cursor in a period when the path starting operation is detected and the path ending operation is not detected as the extension of the path.
Optionally, the path initiation operation comprises: pressing a left mouse button; the path end operation includes: a releasing operation based on the pressing operation.
Optionally, the step of drawing the bezier curve in real time with the extension of the path by the drawing module includes:
detecting the 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 line of the drawn Bezier curve is set in advance.
Optionally, the detection module is further configured to: detecting whether a preset menu key for erasing the content of the PDF document is triggered or not, and determining that the function of erasing the content of the PDF document is started when the menu key is detected to be triggered.
Compared with the prior art, the embodiment of the invention comprises the following steps: detecting a path of a cursor of a mouse in a PDF document after detecting that a function of erasing the content of the PDF document is started; drawing a Bezier curve in real time along with the extension of the path; and setting the drawn Bezier curve as a preset color so as to erase the PDF document content passed by the path. By the scheme of the embodiment, the content in the PDF document can be conveniently erased, and a technical basis is provided for correcting the content of the PDF document.
Additional features and advantages of the invention 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 invention. The objectives and other advantages of the invention 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 invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a flow chart of a method for erasing the contents of a PDF document according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for detecting a path of a mouse cursor in a PDF document according to an embodiment of the present invention;
FIG. 3 is a flowchart of a method for plotting Bezier curves in real time as a path is extended, in accordance with an embodiment of the present invention;
fig. 4 is a block diagram of an apparatus for erasing the content of a PDF document according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
To achieve the object of the embodiment of the present invention, an embodiment of the present invention provides a method for erasing portable document format PDF document content, as shown in fig. 1, where the method may include S101 to S103:
s101, detecting a path of a cursor of a mouse in the PDF document after detecting that a function of erasing the content of the PDF document is started.
In the embodiment of the present invention, in order to erase the content in the PDF document, the user is required to first select the content that is desired to be erased, and specifically, the area that is selected by the user and is desired to delete the content may be determined by a path that a cursor passes through when the user operates a mouse. Therefore, after the function of erasing the content of the PDF document is started, the path of the cursor can be detected to determine the area where the PDF content which the user wants to erase is located.
Alternatively, as shown in fig. 2, detecting the path of the cursor of the mouse in the PDF document may include S201 to S202:
s201, detecting a preset path starting operation and a preset path ending operation;
s202, taking the moving track of the cursor in the PDF document during the starting operation and the ending operation of the path as the complete path of the cursor;
and taking the movement of the cursor in a period when the path starting operation is detected and the path ending operation is not detected as the extension of the path.
In the embodiment of the present invention, the path refers to a moving track that the cursor experiences when continuously moving from a starting point to an end point. Based on this definition, it is possible to detect the start point and the end point of the continuous movement of the cursor after the function of erasing the contents of the PDF document is started. Specifically, a path start operation and a path end operation of the user may be detected, and when a preset path start operation is detected, the position of the current cursor may be determined as a start point of the path.
In the embodiment of the present invention, the moving process of the cursor from the starting point to the end point can be used as the extending process of the path.
Optionally, the path initiation operation may include: pressing a left mouse button; the path end operation includes: a releasing operation based on the pressing operation.
In the embodiment of the invention, when a 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 area to be erased passes, so that the system is informed that the current position of the mouse is the end position, namely the current erasing operation is finished.
In other embodiments of the present invention, other path starting operations and path ending operations may also be adopted, for example, a left button of a dual-mouse represents a path starting operation, and a right button of the dual-mouse represents a path ending operation. The specific operation form of the path start operation and the path end operation is not limited, and any operation may be adopted according to an application scenario or a requirement.
Optionally, the method may further include: whether a preset menu key for erasing the content of the PDF document is triggered is detected, and when the menu key is triggered, the function of erasing the content of the PDF document is determined to be started.
In the embodiment of the present invention, in order to determine when to start the embodiment of the present invention, a function starting device or 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 invention needs to be started at present.
S102, drawing a Bezier curve in real time along with the extension of the path;
in the embodiment of the present invention, in forming a path for deleting PDF content by a cursor, a bezier curve may be drawn on a PDF document along the path so that a line passing through the bezier curve covers an area through which the path passes.
Alternatively, as shown in fig. 3, plotting the bezier curve in real time as the path extends may include S301-S302:
s301, detecting the coordinates of the cursor on the PDF document in real time along with the extension of the path;
and S302, drawing a Bezier curve in real time according to the coordinates detected in real time.
In the embodiment of the invention, each Bezier curve is a smooth curve drawn according to the coordinates of any point at four positions, so that 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 which the cursor passes in the process of forming the path can be detected in real time, and the corresponding Bezier curve can be drawn according to each coordinate point on the whole path in real time.
Optionally, the method may further include: the thickness of the line of the drawn bezier curve is set in advance.
In the embodiment of the invention, in order to adapt to the application of the areas to be erased with different sizes, an adjusting function for the thickness degree of the lines of the Bezier curve can be set, so that a user can automatically adjust the thickness of the lines according to the sizes of the different areas or personal requirements.
In the embodiment of the invention, when the lines are thin, the coverage range of the drawn Bezier curve can be small, so that the erasable PDF document content is small in area; when the lines are thick, the coverage range of the drawn Bezier curve can be enlarged, and the PDF document content with a larger area can be erased.
S103, setting the drawn Bezier curve as a preset color to erase the PDF document content passed by the path.
Optionally, the method may further include: the color to which the bezier curve needs to be set is pre-adjusted.
In the embodiment of the invention, in order to adapt to the application of the to-be-erased areas with different colors, a function of adjusting the color of the bezier curve can be set, so that a user can automatically adjust the color of the line according to the background color or personal requirements of different PDF documents, that is, the user can automatically adjust the preset color.
In the embodiment of the present invention, for different background colors of a PDF document, in order to achieve the purpose of erasing the content of the PDF document, the color of the bezier curve may be set to a corresponding color.
In the embodiment of the present invention, when the background color of the PDF document is white and the font color is black, the color of the bezier curve may be set to white, so that the black font of the path region is covered by white, thereby achieving the purpose of erasing the content of the PDF document.
In the embodiment of the present invention, on the basis of erasing the content of the PDF document, if a purpose of reminding is desired (for example, reminding the area that the related content is erased or reminding the user that the content of the area needs to be corrected), the color of the bezier curve may be set to be a preset reminding color, where the reminding color is different from the background color of the PDF document, so that the user can clearly distinguish the reminding color. For example, when the background color of the PDF document is white and the font color is black, the reminder color may be red or yellow. For the reminding color, the user can define the reminding color by self, and default colors can be preset in a menu of the PDF document.
In the embodiment of the present invention, in order to implement the above-mentioned reminding function, a reminding option may be set in a menu of a PDF document in advance, for example: deleting the reminding, correcting the reminding and the like, and providing corresponding color selection windows aiming at different reminding options so that the user can define the colors corresponding to the different reminding options.
In the embodiment of the invention, the Bezier curve can be set as the preset color in real time in the drawing process, and the drawn Bezier curve can also be uniformly set as the preset color after the path ending operation is executed.
In the embodiment of the invention, the content in the PDF document can be conveniently erased by the scheme of the embodiment, a technical basis is provided for correcting the content of the PDF document, different erasing colors and line thicknesses can be set, the requirement of adapting to different application scenes is met, and the user experience is further improved.
In order to achieve the purpose of the embodiment of the present invention, an apparatus 1 for erasing portable document format PDF document content is further provided in the embodiment of the present invention, and it should be noted that any embodiment of the foregoing method embodiments is applicable to the embodiment of the apparatus, and details are not repeated here. As shown in fig. 4, the apparatus may include: a detection module 11, a drawing module 12 and a setting module 13;
the detection module 11 is configured to detect a path of a cursor of a mouse in the PDF document after detecting that a function of erasing the content of the PDF document is started;
the drawing module 12 is used for drawing a Bezier curve in real time along with the extension of the path;
and the setting module 13 is 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 detects a path of a cursor of the mouse in the PDF document, including:
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 starting operation and the ending operation of the path as the complete path of the cursor;
and taking the movement of the cursor in a period when the path starting operation is detected and the path ending operation is not detected as the extension of the path.
Optionally, the path initiation operation comprises: pressing a left mouse button; the path end operation includes: a releasing operation based on the pressing operation.
Optionally, the step of drawing the bezier curve in real time by the drawing module 12 along the extension of the path includes:
detecting the 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 line of the drawn Bezier curve is set in advance.
Optionally, the detection module is further configured to: detecting whether a preset menu key for erasing the content of the PDF document is triggered or not, and determining that the function of erasing the content of the PDF document is started when the menu key is detected to be triggered.
Compared with the prior art, the embodiment of the invention comprises the following steps: detecting a path of a cursor of a mouse in a PDF document after detecting that a function of erasing the content of the PDF document is started; drawing a Bezier curve in real time along with the extension of the path; and setting the drawn Bezier curve as a preset color so as to erase the PDF document content passed by the path. By the scheme of the embodiment, the content in the PDF document can be conveniently erased, and a technical basis is provided for correcting the content of the PDF document.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between 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 by several physical components in cooperation. 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 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 is well known to those of ordinary skill 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 accessed by a computer. In addition, 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 as known to those skilled in the art.

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 a PDF document after detecting that a function of erasing the content of the PDF document is started;
drawing a Bezier curve in real time along with the extension of the path;
and setting the drawn Bezier curve as a preset color so as to erase the PDF document content passed by the path.
2. The method for erasing the content of the PDF document according to claim 1, wherein said detecting the path of the cursor of the mouse in the 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;
and taking the movement of the cursor in a period when the path starting operation is detected and the path ending operation is not detected as the extension of the path.
3. The method of erasing the contents of a PDF document according to claim 2, wherein said path initiation operation comprises: pressing a left mouse button; the path ending operation includes: a releasing operation based on the pressing operation.
4. The method of erasing the content of a PDF document according to claim 1, wherein said plotting bezier curves in real time as said path extends comprises:
detecting the 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 of erasing the contents of a PDF document according to claim 1, further comprising: the thickness degree of the line of the drawn Bezier curve is set in advance.
6. The method of erasing the contents of a PDF document according to claim 1, further comprising:
detecting whether a preset menu key for erasing the content of the PDF document is triggered or not, and determining that the function of erasing the content of the PDF document is started when the menu key is detected to be triggered.
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 detecting the starting of the function of erasing the content of the PDF document;
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 as a preset color so as to erase the PDF document content passed by the path.
8. The apparatus for erasing the content of a PDF document according to claim 7, wherein said detecting module detects the path of the cursor of the mouse in the 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;
and taking the movement of the cursor in a period when the path starting operation is detected and the path ending operation is not detected as the extension of the path.
9. The apparatus for erasing the content of a PDF document according to claim 8, wherein said path initiation operation comprises: pressing a left mouse button; the path ending operation includes: a releasing operation based on the pressing operation.
10. The apparatus for erasing the content of a PDF document according to claim 7, wherein said drawing module drawing bezier curves in real time as said path extends comprises:
detecting the 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.
CN201810872934.2A 2018-08-02 2018-08-02 Method and device for erasing PDF document content Active CN110806828B (en)

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