CN111444672A - Method for scaling stamp and PDF in linkage manner during PDF stamping of mobile terminal - Google Patents
Method for scaling stamp and PDF in linkage manner during PDF stamping of mobile terminal Download PDFInfo
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- CN111444672A CN111444672A CN202010528445.2A CN202010528445A CN111444672A CN 111444672 A CN111444672 A CN 111444672A CN 202010528445 A CN202010528445 A CN 202010528445A CN 111444672 A CN111444672 A CN 111444672A
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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
- G06F3/017—Gesture based interaction, e.g. based on a set of recognized hand gestures
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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]
- G06F3/0481—Interaction techniques based on graphical user interfaces [GUI] based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance
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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]
- G06F3/0484—Interaction techniques based on graphical user interfaces [GUI] for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
- G06F3/04847—Interaction techniques to control parameter settings, e.g. interaction with sliders or dials
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Abstract
The invention discloses a method for zooming the linkage of a seal and PDF when a mobile terminal PDF seals, which does not need to synthesize the seal and an original PDF file into a fixed PDF file and comprises the following steps: monitoring the scaling change of the PDF page in real time to obtain the scaling of the PDF page, and calculating the size of the scaled seal in real time in an equal ratio; monitoring the sliding change of a PDF page in real time to obtain the offset of the PDF page, and calculating the real-time coordinate of the seal in real time; and (3) drawing the seal on the PDF after zooming and/or sliding change in real time, so as to realize seamless linkage of the seal and the PDF. The invention does not need to synthesize the seal and the PDF file into a new file, and has less memory occupation and high performance for the mobile terminal; the method can adapt to stamp and PDF zooming linkage operation in various scenes, and is friendly to user interaction experience.
Description
Technical Field
The invention relates to the technical field of information security and electronic signature, in particular to a method for zooming seal and PDF in a linkage manner when PDF (portable document format) of a mobile terminal is stamped based on a PDF engine.
Background
Stamping: also known as a stamp, is used as a stationery that is printed on a document to represent an authentication or signing. Here in the form of an electronic picture. PDF: the short form of Portable Document Format means Portable Document Format, which is a file Format developed by adobes systems for exchanging files in a manner independent of application programs, operating systems, and hardware.
Electronic signature: the electronic signature is an expression form of the electronic signature, the electronic signature operation is converted into a visual effect which is the same as the paper document stamping operation by using an image processing technology, and meanwhile, the authenticity and the integrity of electronic information and the non-repudiation of a signer are guaranteed by using the electronic signature technology.
Moving end stamping: the mobile terminal stamping means that a PDF file is opened at a mobile equipment terminal, a manufactured stamp is drawn to a certain position on a PDF page through corresponding technical processing, and electronic signature operation is further completed after a user confirms the position without error.
The existing mobile terminal stamping technology basically synthesizes a seal and an original PDF file into a new PDF file, so that the seal becomes a part of a PDF page, and the seal and the PDF are zoomed in and out in a linkage manner. However, this technical implementation has the following problems: (1) for the mobile terminal, the memory overhead is large, and the performance is poor. For large PDF file processing, it may not be completed at the mobile end, or it may be time consuming and slow for the system card. (2) If the seal is synthesized with the original PDF at the server side, the synthesized file must be downloaded to the mobile side for display, and the problem of time consumption for downloading large files also exists. (3) In a mobile terminal or a server terminal, once the seal is synthesized with the original PDF, the position of the seal cannot be changed and is permanently fixed at a certain position of a certain page. If the position of the stamp is required to be changed, the PDF file needs to be synthesized again.
In the era of mobile internet, users pay great attention to operation experience, and the user experience brought by the above technology is very poor and unfriendly.
Disclosure of Invention
The invention aims to provide a method for zooming the linkage of a seal and PDF during the PDF stamping of a mobile terminal, which can effectively solve the problems brought by the technology and bring very friendly user experience to users.
The invention does not need to synthesize the seal and the PDF file, can dynamically draw the seal to the appointed position of the PDF page, has small memory overhead for a mobile terminal and high performance, and can randomly change the position of the seal. The following problems need to be solved for the linkage of stamp and PDF page scaling without synthesis: 1) how to calculate the size of the seal dynamically in real time according to the scaling of PDF and draw the seal. 2) When PDF zooming, sliding and page rolling switching are carried out, the offset of the page is dynamically calculated, and meanwhile, a relative coordinate point of the seal relative to the upper left corner of the page is calculated and serves as an original point.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for zooming seal and PDF linkage when a mobile terminal PDF stamps comprises the following steps that the seal and an original PDF file are not required to be synthesized into a fixed PDF file: monitoring the scaling change of the PDF page in real time to obtain the scaling of the PDF page, and calculating the size of the scaled seal in real time in an equal ratio; monitoring the sliding change of a PDF page in real time to obtain the offset of the PDF page, and calculating the real-time coordinate of the seal in real time; and (3) drawing the seal on the PDF after zooming and/or sliding change in real time, so as to realize seamless linkage of the seal and the PDF.
Further, when the PDF page is only zoomed, the zoomed stamp coordinates are as follows:
signatureX = pointX - pdfView.getCurrentXOffset() （1），
signatureY= pointY- pdfView.getCurrentYOffset()-displayedPage *pageHeight （2），
wherein, signatureX: a new abscissa of the stamp;
pointX: clicking the original abscissa of the seal when the PDF View page is zoomed;
pdfview. getcurrentxoffset (): transverse offset of PDF page;
signatureY: a new ordinate of the stamp;
pointY: clicking the original ordinate of the seal when the PDF View page is zoomed;
pdfview. getcurrentyoffset (): longitudinal offset of PDF page;
displayedPage: counting the page number of the currently displayed page from 0, namely the first page is 0, and the calculation of signatureY requires knowing the number of PDF pages which are scrolled out upwards at the current page;
pageHeigh: the page height of the PDF.
Further, when the PDF page is not zoomed but is changed by sliding, the coordinates of the stamp after sliding are as follows:
signatureX= pointX （3），
signatureY= pointY- pdfView.getCurrentYOffset() （4）。
further, when the PDF page zooming and sliding change: clicking PDF View for the first time, and zooming and sliding seal coordinates:
signatureX = pointX - pdfView.getCurrentXOffset() （1）
currentOffsetY = pdfView.getCurrentYOffset() + displayedPage *pdfView.getSpacingPx() * pdfView.getZoom() （7）
signatureY = pointY - (displayedPage * pageHeight + currentOffsetY) （8）
wherein currentOffsetY: offset of the y coordinate;
pdfview. getspacengpx (): a division space between PDF pages;
pdfview. getzoom (): scaling of the PDF.
Further, when the PDF page zooming and sliding change: non-first click PDF View, seal coordinates after zooming and sliding:
according to signaturewxpercent = signaturexx/pageWidth (5),
obtaining a signatureX = pageWidth signatureXPercent (6);
according to signaturypercent = signatureY/pageHeight (9),
obtaining an signatureY = pageHeight signaturypercent (10);
wherein, signatureXPercent: percentage of stamp abscissa and PDF page width;
pageWidth: PDF page width;
signaturypercent: ordinate versus percentage of PDF pages high.
The invention relates to a seal and PDF zooming linkage during moving end stamping, which is characterized in that after the seal is stamped to a certain position of a PDF page, when the PDF page is zoomed by adopting gestures, the size and the position of the seal are dynamically changed in real time according to the zooming proportion of PDF, so that seamless linkage with the PDF is realized. The invention adopts the technology of linkage zooming of the seal and PDF when the mobile terminal stamps, so that the seal is dynamically zoomed when the stamped page is zoomed, the seal coordinate is dynamically changed when the page slides, and seamless linkage is realized; the problem that the seal disappears or the size and the position of the seal are not changed when the page with the seal is drawn and zoomed is solved.
The invention is different from the existing stamp and PDF synthesis technology, the stamp and PDF do not need to be synthesized to regenerate new PDF when the stamp is stamped, but the stamp is dynamically drawn on one page of PDF by acquiring canvases (a canvas tool written by java programming language) of the appointed PDF page, the position and the size of the stamp can be changed at will, and the invention is convenient and fast.
The biggest difficulty of the invention is that: dynamically calculating the coordinates of the seal; the offset of the PDF has many factors, such as zooming, sliding, page switching, etc., which all cause the coordinates of the stamp to change. Therefore, the coordinate of the stamp can be accurately calculated only by monitoring the change of the PDF offset in real time.
In other words, the key points of the present invention are as follows: (1) under the condition of only PDF page zooming, calculating the x and y coordinates of the seal and carrying out equal-ratio zooming processing on the seal; (2) only rolling PDF page under the condition of not zooming, and calculating the x and y coordinates of the seal; (3) calculating the x and y coordinates of the seal under the conditions of PDF zooming and rolling; (4) and carrying out whole-course dynamic monitoring on PDF page changes.
The invention has the following advantages: (1) the invention can adapt to stamp and PDF zooming linkage operation in each scene; (2) the invention does not need to synthesize the seal and the PDF file into a new file, and has less memory occupation and high performance for the mobile terminal; (3) the invention does not modify the original file and does not generate a new file; (3) the invention is friendly to the user interaction experience.
Drawings
FIG. 1 shows a single page stamp and PDF zooming linkage principle; FIG. 2 shows that the seal is linked with the PDF page when the pages are switched by the multi-page PDF rolling under the condition of no zooming; FIG. 3 is the linkage of the stamp and the PDF page when zooming and scrolling the page under the condition of multiple pages.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples.
The method for performing linkage scaling on the seal and the PDF during the PDF stamping of the mobile terminal based on the PDF engine in this embodiment is to dynamically change the size and the coordinates of the seal by dynamically calculating the scaling and the offset of the PDF, so as to realize seamless linkage between the seal and the PDF.
Example 1: the implementation steps of synchronous scaling are as follows: (1) setting a zooming monitor, and monitoring the zooming change of the PDF page in real time to obtain a corresponding zooming proportion; (2) generating a zoomed seal according to the obtained page zooming proportion; (3) and redrawing the new seal on the page.
When the PDF page is zoomed through the gesture, the seal needs to be zoomed. To realize linkage zooming, the zooming ratio of PDF is firstly known, and the size of the seal is zoomed in an equal ratio according to the zooming ratio after the zooming ratio of PDF is obtained. The seal is zoomed in and out in equal proportion while PDF is zoomed in and out, so that the zooming state of PDF can be monitored in real time, and the real-time zooming of the seal is realized.
Regarding the calculation of the stamp coordinate, firstly, the upper left corner of the page is appointed as the origin, and when the page is zoomed, the real-time coordinate of the stamp can be dynamically calculated through the specific offset of the page.
As shown in fig. 1, it is a schematic view of the principle of single page stamp and PDF zooming linkage. The offset in the figure is relative to the PDF View, offset is the part of the page sliding out of the PDF View upwards, and offset is the part of the page sliding out of the PDFView leftwards, and the offset is negative.
Before the un-scaling operation in FIG. 1, when the page is in the un-scaled state, the PDF page height does not fill up the PDF view height, so a positive offset value occurs.
Regarding the size of the seal after zooming: which is equal to the scale before scaling.
Regarding the scaled stamp coordinates:
signatureX = pointX-pdfview. getcurrentxoffset () (1) wherein signatureX: a new abscissa of the stamp;
pointX: clicking the abscissa of the PDF View relative to the origin of coordinates of the PDF View (the original abscissa of the stamp when the PDFview page is clicked before zooming action);
pdfview. getcurrentxoffset (): the PDF page lateral offset (i.e. offset x, which is a negative number in fig. 1) is obtained. signatureY = pointY-pdfview. getcurrentyoffset () -displaypage _ page height (2) signatureY is different from signatureX in that the offset of each page of the stamp lateral offset is the same; the vertical offset is different, and the offset is increased along with the increase of the number of pages, and the vertical offset includes the heights of all the pages which slide out in the offset.
Wherein, signatureY: a new ordinate of the stamp;
pointY: clicking a vertical coordinate relative to the origin of coordinates of the PDF View after clicking the PDF View (the original vertical coordinate of the seal when clicking the pdfvew page before zooming action);
pdfview. getcurrentyoffset (): the PDF page vertical offset (as shown in fig. 1, i.e. offset, the value of offset is negative);
displayedPage: counting the page number of the currently displayed page from 0, namely the first page is 0, and the calculation of signatureY requires knowing the number of PDF pages which are scrolled out upwards at the current page;
pageHeigh: the current PDF page height.
Example 2: the synchronous movement is realized by the following steps: (1) setting a page rolling monitor and monitoring the rolling change of the PDF page in real time; (2) monitoring through a rolling monitor, calculating page offset in real time, and calculating a real-time coordinate of the seal rolling on the page; (3) and drawing the seal to a new coordinate position obtained through calculation in real time according to the coordinate.
When the PDF page is slid, the stamp also needs to be linked with the PDF page, and at this time, the offset of PDF needs to be known, and the x and y coordinates of the stamp are dynamically calculated according to the offset of the PDF page, so that the stamp can be kept at a certain point of the page without being offset and is always at a certain point. Regarding the calculation of the stamp coordinate, firstly, the upper left corner of the page is appointed as the origin, when the page rolls, the offset of the page is obtained through calculation, and the real-time coordinate of the stamp is dynamically calculated according to the offset.
As shown in fig. 2, the stamp and the PDF page are linked when pages are switched by scrolling a plurality of PDF pages without zooming.
As can be seen from fig. 2, in the case where the page is scrolled without zooming, the page of the PDF moves upward beyond the screen, and is shifted in the negative direction, and the offset is negative.
Regarding the scaled stamp coordinates:
signatureX is unchanged from before scrolling, i.e., signatureX = pointX (3),
signatureY= pointY- pdfView.getCurrentYOffset() （4）
example 3:
when the PDF is zoomed and rolled, the zooming proportion and the offset are calculated in real time, the size and the coordinate of the seal are calculated according to the two values, and then the seal is drawn on a page, so that the seamless linkage effect is realized.
As shown in fig. 3, when the scaling is 2 times the original and the page is scroll-switched, the page of the PDF moves upward beyond the screen, and is negatively shifted, and offset is negative, and the x-axis is also shifted leftward, and offset is negative.
The method for calculating the seal x coordinate by clicking PDF View for the first time comprises the following steps:
signatureX = pointX - pdfView.getCurrentXOffset() （1）
note: the non-first click PDF View, the seal x coordinate calculation method:
signatureXPercent = signatureX / pageWidth; （5）
signatureX = pageWidth * signatureXPercent; （6）
wherein, signatureXPercent: percentage of stamp abscissa and PDF page width;
pageWidth: the PDF page is wide.
The method for calculating the seal y coordinate by clicking PDF View for the first time comprises the following steps:
currentOffsetY = pdfView.getCurrentYOffset() + displayedPage *pdfView.getSpacingPx() * pdfView.getZoom(); （7）
signatureY = pointY - (displayedPage * pageHeight + currentOffsetY); （8）
wherein currentOffsetY: offset of the y coordinate;
pdfview. getspacengpx (): a division space between PDF pages;
pdfview. getzoom (): scaling of the PDF.
The calculation method of the y coordinate of the non-first click PDF View comprises the following steps:
signatureYPercent = signatureY / pageHeight; （9）
signatureY = pageHeight * signatureYPercent; （10）
wherein, signaturypercent: ordinate versus percentage of PDF pages high.
Specification standard of PDF:
PDF/X-1:1999 and PDF/X-1. They were early versions of the PDF/X standard developed by CGATS and ANSI, both of which have been eliminated due to the lack of support for spot and bi-tonal image processing by PDF/X-1:1999, and the migration of the application of the OPI (Open Presseritive Open prepress interface) technology employed by PDF/X-1.
PDF/X-1a, a version of the PDF/X standard modified by the ISO version 1.3 in 2001 on the basis of the version PDF/X-1:1999, which supports CMYK color mode, gray mode and spot color mode, prohibits the use of images in RGB or L ab color mode, and also prohibits the use of OPI and file encryption techniques, and requires that all the fonts used must be embedded in the file, the version PDF/X-1a:2003 is modified from PDF1.4, but it does not support transparency and JBIG2 high-magnification compression techniques.
PDF/X-2, which is a PDF1.4 version PDF/X standard manufactured by ISO in 2003 based on PDF/X-1a and PDF/X-3, is compatible with both, and can use a plurality of color modes such as CMYK, &lTtTtranslation = L "&gTtL &lTt/T &gTtab for data processing and conversion, support ICC color management techniques, support transparent layer effects in files, and OPI external objects like PDF/X-3, but unlike the PDF/X-1a and PDF/X-3 standards, the fonts used must be fully embedded in the file, only the fonts used.
PDF/X-3. the PDF/X-3 standard, published by ISO, has PDF/X-3:2002 and PDF/X-3: 20032 versions, both of which are extensions compatible with the PDF/X-1a standard, the former based on PDF1.3 version and the latter based on PDF1.4 version, but not supporting the transparency of PDF1.4 and JBIG2 compression technique, which also requires all the fonts used to be embedded in the file for storage.
PDF/X-4 is PDF/X-4 based on version 1.6 PDF/X standard published by ISO 2007, version 2008 is PDF/X based on version 1.7 PDF/X-4 is characterized by specifying that all fonts and image data used must be embedded in a file (allowing for embedding OpenType fonts), allowing for transparency processing and layer technology, allowing for CMYK, RGB, L ab, gray scale, spot color or ICC based color patterns, allowing for the selective use of 16 bits of image data (which may have computational errors in some RIP systems), not supporting OPI technology and file encryption technology, not allowing for the inclusion of JavaScript code, music, video or unprintable description information.
PDF/X-5. This is the PDF/X standard specified by ISO in 2008 based on PDF1.6 and PDF1.7 versions. It is an extension of PDF/X-4, the biggest difference with PDF/X-4 is that PDF/X-5 allows the use of OPI objects in files. In the PDF/X-5 standard, PDF/X-5g is an extension of PDF/X-4, PDF/X-5pg is an extension of PDF/X-4p, both supporting OPI objects, and PDF/X-5 is an extension of PDF/X-4p, which can accept color patterns other than RGB, gray scale, and CMYK, but this feature may cause unnecessary prepress color problems.
In the three embodiments, the determination of the origin of coordinates is helpful for accurately calculating the coordinates of the stamp under the conditions of scaling and rolling of the PDF page. Each PDF page has an independent coordinate system, is independent of each other and does not interfere with each other. In addition, the drawing of the stamp is performed by taking the coordinate point of the stamp as the intersection point of the diagonals of the stamp.
The above description is only a preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (5)
1. A method for zooming seal and PDF linkage when a mobile terminal PDF seals is characterized in that the method does not need to synthesize a seal and an original PDF file into a fixed PDF file, and comprises the following steps: monitoring the scaling change of the PDF page in real time to obtain the scaling of the PDF page, and calculating the size of the scaled seal in real time in an equal ratio; monitoring the sliding change of a PDF page in real time to obtain the offset of the PDF page, and calculating the real-time coordinate of the seal in real time; and (3) drawing the seal on the PDF after zooming and/or sliding change in real time, so as to realize seamless linkage of the seal and the PDF.
2. The method for zooming the seal and the PDF in linkage manner during the PDF stamping of the mobile terminal according to claim 1, wherein under the condition that the PDF page is only zoomed, the coordinates of the seal after zooming are as follows:
signatureX = pointX - pdfView.getCurrentXOffset() （1），
signatureY= pointY- pdfView.getCurrentYOffset()-displayedPage *pageHeight （2），
wherein, signatureX: a new abscissa of the stamp;
pointX: clicking the original abscissa of the seal when the PDF View page is zoomed;
pdfview. getcurrentxoffset (): transverse offset of PDF page;
signatureY: a new ordinate of the stamp;
pointY: clicking the original ordinate of the seal when the PDF View page is zoomed;
pdfview. getcurrentyoffset (): longitudinal offset of PDF page;
displayedPage: counting the page number of the currently displayed page from 0, namely the first page is 0, and the calculation of signatureY requires knowing the number of PDF pages which are scrolled out upwards at the current page;
pageHeigh: the page height of the PDF.
3. The method for zooming the seal and the PDF in linkage during the PDF stamping of the mobile terminal according to claim 1, wherein under the condition that the PDF page is not zoomed and only slides and changes, the coordinates of the seal after sliding are as follows:
signatureX= pointX （3），
signatureY= pointY- pdfView.getCurrentYOffset() （4）。
4. the method for seal and PDF linkage zooming during PDF stamping of the mobile terminal according to any one of claims 1-3, wherein under the condition of PDF page zooming and sliding change:
clicking PDF View for the first time, and zooming and sliding seal coordinates:
signatureX = pointX - pdfView.getCurrentXOffset() （1）
currentOffsetY = pdfView.getCurrentYOffset() + displayedPage *pdfView.getSpacingPx() * pdfView.getZoom() （7）
signatureY = pointY - (displayedPage * pageHeight + currentOffsetY) （8）
wherein currentOffsetY: offset of the y coordinate;
pdfview. getspacengpx (): a division space between PDF pages;
pdfview. getzoom (): scaling of the PDF.
5. The method for seal and PDF linkage zooming during PDF stamping of the mobile terminal according to claim 4, wherein under the condition of the page zooming and sliding change of PDF:
non-first click PDF View, seal coordinates after zooming and sliding:
according to signaturewxpercent = signaturexx/pageWidth (5),
obtaining a signatureX = pageWidth signatureXPercent (6);
according to signaturypercent = signatureY/pageHeight (9),
obtaining an signatureY = pageHeight signaturypercent (10);
wherein, signatureXPercent: percentage of stamp abscissa and PDF page width;
pageWidth: PDF page width;
signaturypercent: ordinate versus percentage of PDF pages high.
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