CN112733095A - Implementation method and equipment for automatically generating document watermark - Google Patents
Implementation method and equipment for automatically generating document watermark Download PDFInfo
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- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
- G06F21/16—Program or content traceability, e.g. by watermarking
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Abstract
The invention discloses a realization method and equipment for automatically generating a document watermark, wherein the method comprises the following steps: setting first watermark parameters to be configured, and determining first parameter values of the first watermark parameters; acquiring the first watermark parameter and the corresponding first parameter value, and constructing a first bitmap based on the first watermark parameter and the corresponding first parameter value; automatically loading the first bitmap into a specified document using an iTextSharp component to generate a document watermark.
Description
Technical Field
The embodiment of the specification relates to the technical field of computers, in particular to an implementation method and equipment for automatically generating a document watermark.
Background
When editing a document, it is common to add a watermark to the document in order to indicate the importance or confidentiality of the document. At present, watermarks for generating PDF documents are classified into text watermarks and picture watermarks. Text watermarks are commonly used in the commercial world to alert the reader that the document is copyrighted and that others cannot copy or use it free. In addition to this feature, the text watermark can also be used to mark some basic state information of the document, such as draft state or final version, etc. The picture watermark is a good choice for beautifying the PDF document, and colorful and unique pictures can be used as the background of the PDF document.
In the process of generating the watermark of the PDF document by the management software, the watermark adding to the PDF document can be realized by third-party software such as Spire.
Therefore, how to provide an implementation method and device which support a parameter configuration function and can automatically generate a document watermark becomes a technical problem which needs to be solved urgently.
Disclosure of Invention
The embodiment of the specification provides an implementation method and equipment for automatically generating a document watermark, which are used for solving the following technical problems in the prior art:
in the process of generating the watermark of the PDF document by the management software, the watermark adding to the PDF document can be realized by third-party software such as Spire.
In order to solve the above technical problem, the embodiments of the present specification are implemented as follows:
an embodiment of the present specification provides an implementation method for automatically generating a document watermark, including:
setting first watermark parameters to be configured, and determining first parameter values of the first watermark parameters;
acquiring the first watermark parameter and the corresponding first parameter value, and constructing a first bitmap based on the first watermark parameter and the corresponding first parameter value;
automatically loading the first bitmap into a specified document using an iTextSharp component to generate a document watermark.
Optionally, after setting the watermark parameters to be configured, the method further includes:
supporting to increase watermark parameters and/or modify watermark parameters to obtain second watermark parameters, and determining second parameter values of the second watermark parameters;
acquiring the second watermark parameter and the corresponding second parameter value, and constructing a second bitmap based on the second watermark parameter and the corresponding second parameter value;
automatically loading the second bitmap into the specified document using the iTextSharp component to regenerate a document watermark.
Optionally, the watermark parameter includes at least one of:
the storage path of the watermark picture, the horizontal number of the watermark, the vertical number of the watermark, the transparency of the watermark picture and the rotation angle of the watermark picture.
Optionally, after determining the first parameter value of each first watermark parameter, before acquiring the first watermark parameter and the corresponding first parameter value, the method further includes:
checking whether the parameter values of the horizontal number of the watermarks and the parameter values of the longitudinal number of the watermarks meet requirements, specifically comprising:
checking whether the parameter value of the horizontal width of the watermark multiplied by the horizontal number of the watermark exceeds the width of the page;
it is checked whether the parameter value of the vertical height of the watermark multiplied by the vertical number of said watermark exceeds the page height.
Optionally, the method further comprises:
and if the parameter values of the horizontal quantity of the watermarks and the parameter values of the longitudinal quantity of the watermarks meet requirements, storing the parameter values.
Optionally, the method further comprises:
and if the parameter values of the horizontal quantity of the watermarks and the parameter values of the longitudinal quantity of the watermarks do not meet the requirements, sending a related prompt message.
Optionally, the method further comprises:
and constructing a PDF reader and a printer based on the iTextSharp component, and setting watermarks according to the horizontal number of the watermarks and the vertical number of the watermarks.
Optionally, the storage path of the watermark picture specifically includes:
setting the size of the watermark picture by combining the horizontal number of the watermarks and the vertical number of the watermarks;
the type of the watermark picture needs to support the construction of the bitmap.
Optionally, the method further comprises:
drawing the bitmap through a Graphics Device Interface plus (GDI +) drawing tool, and setting the transparency displayed by the bitmap through a color matrix.
An embodiment of the present specification provides an implementation apparatus for automatically generating a document watermark, including:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to:
setting first watermark parameters to be configured, and determining first parameter values of the first watermark parameters;
acquiring the first watermark parameter and the corresponding first parameter value, and constructing a first bitmap based on the first watermark parameter and the corresponding first parameter value;
automatically loading the first bitmap into a specified document using an iTextSharp component to generate a document watermark.
The embodiment of the specification can achieve the following beneficial effects by adopting at least one technical scheme: and the document watermark can be automatically generated by supporting the function of parameter configuration.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the disclosure and are incorporated in and constitute a part of this disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure in any way. In the drawings:
fig. 1 is a schematic flowchart of an implementation method for automatically generating a document watermark according to an embodiment of the present application;
fig. 2 is a schematic diagram of watermark parameter setting provided in an embodiment of the present application;
fig. 3 is a schematic diagram illustrating an effect of watermark generation provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of an implementation apparatus for automatically generating a document watermark according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present disclosure more clear, the following description of the present disclosure will be made in detail and completely with reference to the embodiments of the present disclosure and the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step based on the embodiments in the description belong to the protection scope of the present application.
The embodiment of the present application provides an implementation method for automatically generating a document watermark, which is specifically described below:
fig. 1 is a schematic flowchart of an implementation method for automatically generating a document watermark according to an embodiment of the present application, where the flowchart in fig. 1 includes the following steps:
s101: setting first watermark parameters to be configured, and determining first parameter values of the first watermark parameters;
s102: acquiring the first watermark parameter and the corresponding first parameter value, and constructing a first bitmap based on the first watermark parameter and the corresponding first parameter value;
s103: automatically loading the first bitmap into a specified document using an iTextSharp component to generate a document watermark.
Firstly, setting first watermark parameters to be configured, and determining first parameter values of the first watermark parameters; taking a first watermark parameter and a corresponding first parameter value, and constructing a first bitmap based on the first watermark parameter and the corresponding first parameter value; automatically loading the first bitmap into a specified document by using an iTextSharp component to generate a document watermark.
Considering that in practical application, a generated document watermark may not be desired by a user, and needs to be adjusted in terms of watermark size, watermark transparency, and the like, therefore, after setting watermark parameters to be configured, an implementation method for automatically generating a document watermark further includes: supporting to increase watermark parameters and/or modify watermark parameters to obtain second watermark parameters, and determining second parameter values of the second watermark parameters; acquiring a second watermark parameter and a corresponding second parameter value, and constructing a second bitmap based on the second watermark parameter and the corresponding second parameter value; the second bitmap is automatically loaded into the specified document using the iTextSharp component, regenerating the document watermark.
Therefore, the parameter function can be configured, the document watermark can be automatically generated, if the generated watermark is not needed, the adjustment can also be carried out, and the proper document watermark is finally obtained by adding or modifying the watermark parameter.
The watermark parameter includes at least one of:
the storage path of the watermark picture, the horizontal number of the watermark, the vertical number of the watermark, the transparency of the watermark picture and the rotation angle of the watermark picture.
The following describes the watermark parameters in detail:
the storage path of the watermark picture includes but is not limited to the size of the watermark picture and the type of the watermark picture, the size of the watermark picture is reasonably set by combining the horizontal quantity of the watermark and the vertical quantity of the watermark, the type of the watermark picture supports the construction of a generated bitmap, and the supported file formats include BMP, GIF, EXIF, JPG, PNG, TIFF and the like, for example, http:// XX.XX.XX.XX/cwbase/images/contract watermark 5. PNG.
The horizontal quantity of the watermarks is the horizontal arrangement quantity of the watermark pictures and is recommended to be between 1 and 9; in the a4 page, the width of the watermark picture x the horizontal number of watermarks cannot be greater than 595, for example, 3.
The longitudinal number of the watermarks is the longitudinal arrangement number of the watermark pictures, and is recommended to be between 1 and 36; in the a4 page, the height of the watermark picture x the number of vertical watermarks cannot be greater than 841, for example, 5.
The transparency of the watermark picture can be set to be 1-254, and the picture is clearer when the value is larger, for example, 80.
The rotation angle of the watermark picture can be set to be between 0 and 360, and can be a clockwise rotation angle, for example, 330.
The embodiment of the application provides a schematic diagram of watermark parameter setting, as shown in fig. 3, a contract-attached watermark image storage path is set to http:// xx.xx.xx.xx.xx/cwbase/images/contract watermark 5.png, the horizontal number of watermarks is set to 3, the longitudinal number of watermarks is set to 5, the transparency of a watermark image is set to 80, and the rotation angle of the watermark image is set to 330.
In addition, the embodiment of the present application further provides an effect schematic diagram of watermark generation, as shown in fig. 4.
Note that, the information of the watermark parameter may be recorded in table 1, and the structure of table 1 is designed as follows:
table 1:
as shown in table 1, W _ WMLJ refers to a storage path of a watermark picture, W _ WMHX refers to a watermark horizontal number, W _ WMZX refers to a watermark vertical number, W _ WMTMD refers to a watermark picture transparency, and W _ WMXZJD refers to a watermark picture rotation angle.
After determining the first parameter value of each first watermark parameter, before obtaining the first watermark parameter and the corresponding first parameter value, the method further includes:
checking whether the parameter values of the horizontal quantity and the longitudinal quantity of the watermarks meet requirements, and specifically comprising the following steps: checking whether the parameter value of the horizontal width multiplied by the horizontal number of the watermarks exceeds the width of the page; it is checked whether the parameter value of the vertical height of the watermark multiplied by the vertical number of watermarks exceeds the page height.
If the parameter values of the horizontal quantity of the watermarks and the parameter values of the longitudinal quantity of the watermarks meet requirements, storing the parameter values; and if the parameter values of the horizontal quantity of the watermarks and the parameter values of the longitudinal quantity of the watermarks do not meet the requirements, sending a related prompt message. The related prompting message may be "the parameter value of the horizontal quantity of the current watermark is too large" or "the parameter value of the vertical quantity of the current watermark is too large", etc., and the prompting mode may be to send a popup window or to turn to a new page, etc.
It should be noted that, the technical solution also provides that the PDF reader and the imprinter are constructed based on the iTextSharp component, and the watermarks are set according to the number of horizontal watermarks and the number of vertical watermarks.
The storage path of the watermark picture specifically includes: setting the size of the watermark picture by combining the horizontal number and the vertical number of the watermarks; the type of watermark picture needs to support the construction of the bitmap.
The bitmap is drawn by the GDI + drawing tool, and the transparency of bitmap display is set by the color matrix. GDI + is a subsystem in Windows XP, mainly responsible for outputting related information on display screens and printing devices, and is a set of application programming interfaces implemented by C + + classes. GDI + is a successor of the previous version of Graphics Device Interface (GDI), as the name implies, Windows XP still supports the previous version of GDI for compatibility considerations, but when developing new applications, developers should use GDI + to meet the Graphics output requirements because GDI + optimizes GDI in the previous Windows version and adds many new functions. GDI + as a graphic device interface enables application developers to output screen and printer information without considering the details of specific display devices, and the application developers only need to call some methods of the class output by the GDI + library to complete graphic operation, and the real drawing work is completed by the methods handed to specific device drivers, and the GDI + enables graphic hardware and the application programs to be isolated from each other, thereby enabling the developers to write the application programs which are irrelevant to the devices. Therefore, the technical scheme selects to draw the bitmap through a GDI + drawing tool.
To illustrate the technical solution more clearly, the present application provides partial codes of the embodiments, as follows:
and drawing the Bitmap through a GDI + drawing tool. The method comprises the steps of firstly calculating the width and high-level information of a region occupied after image rotation, wherein the height acquisition mode of an original image is image.Width and image.height, then calculating the width and height of the region occupied after rotation according to a rotation angle W _ WMZXJD set by a user, and the implementation mode is as follows:
the method of Math.Cos () is used to obtain the cosine value of the designated angle, the method of Math.Sin () is used to obtain the sine value of the designated angle, the method of Math.abs () is used to obtain the absolute value of the double-precision floating point number, and the new Rectangle () is used to initialize the new Rectangle instance with the designated position and size.
And then, the rotarec.width and rotarec.height are the calculated information of the width and height of the occupied area after the image is rotated. Then, firstly defining a target Bitmap destImage which is null; graphics null; then defining a canvas, wherein the width and the height are the width and the height destImage after the image is rotated, which is new Bitmap (rotaWidth, rotaheight); then graphics is created from destImage so its origin is now in the upper left corner of destImage, i.e.: graphics, frommmage (destImage); in the first step, moving the origin of coordinates of the graphics to the center point of the rectangle, and assuming the coordinates (x, y) of the center point; second, graphics rotates the corresponding angle (along the current origin); in the third step, move back (-x, -y). The method is realized as follows:
setting watermarks according to the parameter horizontal number and the parameter vertical number of the watermarks (based on the itextSharp component), firstly, constructing a PDF reader and an adder based on the itextSharp component, and realizing the following steps:
multiplying the width of the watermark picture by the horizontal number of the watermarks to obtain the total horizontal width occupied by the row of watermarks, and subtracting the total horizontal width of the watermarks from the total width of the document page to obtain a horizontal blank area of the document page; the height of the watermark picture multiplied by the longitudinal number of the watermarks is the longitudinal total height occupied by a row of watermarks, and the total height minus the longitudinal total height of the watermarks is the longitudinal blank area of the document page. Namely:
obviously, the number of the horizontal blank areas separated by the watermark is equal to the horizontal number +1 of the watermark, so that the horizontal interval width of the watermark can be inferred to be the horizontal blank area of the document page divided by the number of the horizontal blank areas; similarly, the total number of the blank areas spaced by the watermark is equal to the total number of the watermark +1, so that the total width of the watermark interval is the total blank area of the document page divided by the number of the longitudinal blank areas.
From this, the specific start coordinates of each watermark can be calculated, and the core algorithm is as follows:
the application also provides a schematic structural diagram of an implementation device for automatically generating the document watermark, as shown in fig. 4. An implementation device for automatically generating a document watermark, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to: setting first watermark parameters to be configured, and determining first parameter values of the first watermark parameters; acquiring a first watermark parameter and a corresponding first parameter value, and constructing a first bitmap based on the first watermark parameter and the corresponding first parameter value; the first bitmap is automatically loaded into the specified document using the iTextSharp component, generating a document watermark.
In summary, the present invention provides an implementation method and device for automatically generating a document watermark, which greatly enrich the configurability of watermark pictures, so that the process of generating the document watermark is simpler and more convenient, the degree of automation is higher, and the method and device have good popularization and application values.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modifications, equivalents, improvements, etc. that come within the spirit of the disclosure are intended to be included within the scope of the claims of the disclosure.
Claims (10)
1. An implementation method for automatically generating a document watermark, the method comprising:
setting first watermark parameters to be configured, and determining first parameter values of the first watermark parameters;
acquiring the first watermark parameter and the corresponding first parameter value, and constructing a first bitmap based on the first watermark parameter and the corresponding first parameter value;
automatically loading the first bitmap into a specified document using an iTextSharp component to generate a document watermark.
2. The method of claim 1, wherein after setting the watermark parameters to be configured, the method further comprises:
supporting to increase watermark parameters and/or modify watermark parameters to obtain second watermark parameters, and determining second parameter values of the second watermark parameters;
acquiring the second watermark parameter and the corresponding second parameter value, and constructing a second bitmap based on the second watermark parameter and the corresponding second parameter value;
automatically loading the second bitmap into the specified document using the iTextSharp component to regenerate a document watermark.
3. The method of claim 2, wherein the watermark parameters include at least one of:
the storage path of the watermark picture, the horizontal number of the watermark, the vertical number of the watermark, the transparency of the watermark picture and the rotation angle of the watermark picture.
4. A method as claimed in claim 3, wherein after determining the first parameter value for each of the first watermark parameters, before obtaining the first watermark parameter and the corresponding first parameter value, the method further comprises:
checking whether the parameter values of the horizontal number of the watermarks and the parameter values of the longitudinal number of the watermarks meet requirements, specifically comprising:
checking whether the parameter value of the horizontal width of the watermark multiplied by the horizontal number of the watermark exceeds the width of the page;
it is checked whether the parameter value of the vertical height of the watermark multiplied by the vertical number of said watermark exceeds the page height.
5. The method of claim 4, wherein the method further comprises:
and if the parameter values of the horizontal quantity of the watermarks and the parameter values of the longitudinal quantity of the watermarks meet requirements, storing the parameter values.
6. The method of claim 4, wherein the method further comprises:
and if the parameter values of the horizontal quantity of the watermarks and the parameter values of the longitudinal quantity of the watermarks do not meet the requirements, sending a related prompt message.
7. The method of claim 3, wherein the method further comprises:
and constructing a PDF reader and a printer based on the iTextSharp component, and setting watermarks according to the horizontal number of the watermarks and the vertical number of the watermarks.
8. The method according to claim 3, wherein the storing path of the watermark picture specifically includes:
setting the size of the watermark picture by combining the horizontal number of the watermarks and the vertical number of the watermarks;
the type of the watermark picture needs to support the construction of the bitmap.
9. The method of claim 3, wherein the method further comprises:
drawing the bitmap through a graphic device interface GDI + drawing tool, and setting the transparency of bitmap display through a color matrix.
10. An implementation device for automatically generating a document watermark, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to:
setting first watermark parameters to be configured, and determining first parameter values of the first watermark parameters;
acquiring the first watermark parameter and the corresponding first parameter value, and constructing a first bitmap based on the first watermark parameter and the corresponding first parameter value;
automatically loading the first bitmap into a specified document using an iTextSharp component to generate a document watermark.
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