CN116188628A - Free painting page-crossing drawing and displaying method and server - Google Patents
Free painting page-crossing drawing and displaying method and server Download PDFInfo
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- 238000004364 calculation method Methods 0.000 description 2
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/60—Editing figures and text; Combining figures or text
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/451—Execution arrangements for user interfaces
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/50—Allocation of resources, e.g. of the central processing unit [CPU]
- G06F9/5005—Allocation of resources, e.g. of the central processing unit [CPU] to service a request
- G06F9/5011—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resources being hardware resources other than CPUs, Servers and Terminals
- G06F9/5016—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resources being hardware resources other than CPUs, Servers and Terminals the resource being the memory
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/50—Allocation of resources, e.g. of the central processing unit [CPU]
- G06F9/5005—Allocation of resources, e.g. of the central processing unit [CPU] to service a request
- G06F9/5027—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resource being a machine, e.g. CPUs, Servers, Terminals
- G06F9/5044—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resource being a machine, e.g. CPUs, Servers, Terminals considering hardware capabilities
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a free painting page-crossing drawing and displaying method and a server, wherein the method comprises the following steps: s1: setting a drawing layer on a document, wherein the drawing layer is larger than a single page of the document; s2: judging whether the projection range of the control window exceeds the range of the current drawing layer, if not, returning to the step S2, if so, clearing annotation content displayed on the current drawing layer, and executing the step S3; s3: acquiring position information of a drawing layer; s4: drawing a document page covered by the layer and the position information of the page, and forming a data set by the page and the position information; s5: matching the annotation source data stored in the database with the data in the data set to obtain the real position of the annotation source data on the drawing layer, and rendering the annotation source data on the drawing layer. According to the invention, the position of the drawing layer is dynamically set to replace the traditional one-to-one binding of the drawing layer and the document page, so that the annotation is drawn and displayed on the document in a page-crossing manner.
Description
Technical Field
The invention relates to the technical field of data processing, in particular to a free drawing page-crossing drawing and displaying method and a server.
Background
In the existing PDF free painting, the method for controlling the free painting display is generally compared with the scheme that the free painting layers are more: the first is rendering of rendering content based on PDF when the page is on, and the second is based on a global PDF document. The principle is as follows: in the drawing technology of the mobile terminal (Android), similar to PS (PhotoShop), there is an underlying Canvas (Canvas), and then drawing layers on the Canvas or drawing without adding layers, and drawing the annotations layer by layer.
In summary, the existing annotation painting has some defects. The first type is based on PDF when page, when the file is displayed on the page crossing, the free painting content which is different on the two pages crossing can not be displayed. The second type of global PDF-based solution, while making up the drawbacks of the first scheme, is known to generate a new layer with a memory size=wide×high×each pixel occupied, which is an operation that consumes computer memory, and in many current data displays, free rendering only supports rendering based on the current page of the PDF/electronic file, rather than continuous uninterrupted rendering across pages.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the purposes of the invention is to provide a free painting page-crossing drawing and displaying method, which can solve the problems that the existing annotating painting occupies more resources for a system and page-crossing display or drawing cannot be performed.
The second purpose of the invention is to provide a free drawing page-crossing drawing and displaying server, which can solve the problems that the existing annotating drawing occupies more resources to the system and can not be displayed or drawn page-crossing.
In order to achieve one of the above purposes, the technical scheme adopted by the invention is as follows:
a free painting page-crossing drawing and displaying method comprises the following steps:
s1: setting a drawing layer on a document, wherein the drawing layer is larger than a single page of the document;
s2: judging whether the projection range of the control window exceeds the range of the current drawing layer, if not, returning to the step S2, if so, clearing annotation content displayed on the current drawing layer, and executing the step S3;
s3: acquiring position information of a drawing layer;
s4: drawing a document page covered by the layer and position information of the page, and forming a data set by the page and the corresponding position information;
s5: matching the annotation source data stored in the database with the data in the data set to obtain the real position of the annotation source data on the drawing layer, and rendering the annotation source data on the drawing layer.
Preferably, S1 is specifically implemented by the following steps:
and a drawing layer is overlapped on the display layer of the document, the drawing layer is as wide as the control window, and the height of the drawing layer is 3 times of the height of the control window or the height of the display layer.
Preferably, S2 is specifically implemented by the following steps:
judging whether the sliding of the document page meets the first condition: "the upper edge of the control window exceeds the upper edge of the drawing layer" and condition two: and if not, returning to the step S2, and if so, clearing annotation content displayed on the current drawing layer and executing the step S3.
Preferably, S3 is specifically implemented by the following steps:
s31: acquiring the absolute position of the origin of the current drawing layer in the document;
s32: the relative offset of the current drawing layer based on the current document page is obtained.
Preferably, S4 is specifically implemented by the following steps:
s41: acquiring codes of crossed document pages and positions of corresponding drawing layers of the document pages;
s42: and forming a data set by encoding the document pages and the positions of the corresponding drawing layers of the document pages in a recursion loop mode.
Preferably, S5 is specifically implemented by the following steps:
matching the annotation track input by the user stored in the database on the currently displayed document page with the data in the data set, and taking out the annotation track conforming to the current page and rendering the annotation track on the drawing layer.
Preferably, the following steps are further included after S5:
acquiring an instruction of annotating and drawing a currently displayed document page by a user, and storing coordinate points of annotating and drawing as (X=X) screen +X pageNOffset ,Y＝Y screen +Y pageNOffset ) Wherein (X) screen ，Y screen ) For coordinates acquired based on the upper left corner of the control window, (X) pageNOffse ，Y pageNOffset ) The position of the document page where the annotation is drawn relative to the drawing layer.
In order to achieve the second purpose, the technical scheme adopted by the invention is as follows:
a free painting page-crossing drawing and displaying server comprises a storage and a processor;
a memory for storing program instructions;
and the processor is used for running the program instructions to execute the free drawing page-crossing drawing and displaying method.
Compared with the prior art, the invention has the beneficial effects that: by setting the drawing layer larger than a single page of a document, new drawing layer generation is not easy to trigger in the annotating process, so that the lowest memory consumption is realized, the number of times of generating and drawing the drawing layer is reduced, the calculation power of a CPU (Central processing Unit) and the time of rendering by a UI (user interface) thread are saved, the algorithm time and the space are balanced, the generation of the drawing layer is triggered according to the change of the page of the document, the position information of the drawing layer, the page covered by the drawing layer and the position information of the page are acquired after triggering, the page and the corresponding position information form a data set, the annotating source data stored in a database are matched with the data in the data set, the real position of the annotating source data on the drawing layer is obtained, and the annotating source data is rendered on the drawing layer, so that page-crossing display is realized.
Drawings
FIG. 1 is a flow chart of a free painting page crossing drawing and displaying method in the invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention will be further described with reference to the accompanying drawings and detailed description below:
in the invention, the control window is a window control for displaying a file page, the default window control is paved with a screen, and further, the control window can be a screen set by a computer, a tablet computer or a mobile terminal, and the like, so that the size of the control window is equal to the absolute width and the height of the screen
Embodiment one:
as shown in FIG. 1, the free painting page-crossing drawing and displaying method comprises the following steps:
s1: setting a drawing layer on a document, wherein the drawing layer is larger than a single page of the document;
specifically, the annotation drawing of the document is displayed by setting a drawing layer covered on a document page on the document, preferably, the drawing layer is larger than the document page to satisfy the annotation drawing of the user at any position in the space window, in this embodiment, S1 is specifically implemented by the following steps:
and a drawing layer is overlapped on the display layer of the document, the drawing layer is as wide as the control window, and the height of the drawing layer is 3 times of the height of the control window or the height of the display layer.
Specifically, when the size of the document is greater than or equal to 3 times of the size of the control window, the height of the drawing layer is equal to 3 times of the height of the control window, the width of the drawing layer is equal to the width of the control window, and when the size of the document is smaller than 3 times of the size of the control window, the drawing layer is equal to the size of the document (namely, the width and the height are equal), so that new drawing layer generation is not easy to trigger in the annotating process, the lowest memory consumption is realized, the times of drawing layer generation and drawing are reduced, the calculation force of a CPU and the rendering time of a UI thread are saved, and the algorithm time and the space are balanced.
S2: judging whether the projection range of the control window exceeds the range of the current drawing layer, if not, returning to the step S2, if so, clearing annotation content displayed on the current drawing layer, and executing the step S3;
specifically, by judging whether the range of the display projection of the control window has crossed the range of the current drawing layer along with the reading of the user, for example, the document is controlled to scroll up and down by a mouse, a touch screen, a monitoring panel or other peripheral devices, so that the document page displayed by the current control window has crossed the range of the current drawing layer, the generation of a new drawing layer is triggered, and in this embodiment, S2 is specifically realized by the following steps:
judging whether the sliding of the document page meets the first condition: "the upper edge of the control window exceeds the upper edge of the drawing layer" and condition two: and if not, returning to the step S2, and if so, clearing annotation content displayed on the current drawing layer and executing the step S3.
S3: acquiring position information of a drawing layer;
specifically, the generated drawing layer is determined by calculating a plurality of position information of the drawing layer, and in this embodiment, S3 is specifically implemented by the following steps:
s31: acquiring the absolute position of the origin of the current drawing layer in the document;
specifically, the absolute position (X pdfOffset ，Y pdfOffset ) The origin corresponding to the current drawing layer needs to be placed to the absolute position of the entire PDF document, where X pdfOffset ＝X screenOrigin ，Y pdfOffset Height of =yscreenorigin-control window, where (X screenOrigin ，Y screenOrigin ) Is the position of the upper left corner of the control window.
S32: the relative offset of the current drawing layer based on the current document page is obtained.
Specifically, the acquisition of the offset (X) of the drawing layer based on the current display page cu ,Y cu ) Equivalent to calculating the relative offset of the drawing layer on the basis of the current page (for example, the page 5 is currently displayed, the page 5 is centered, the header of the rectangular page of the page 5 is the origin (0, 0) of the relative coordinate system), preferably X cu ＝X screenOrigin ，Y cu ＝Y pdfOffset -Y pdfpageA Wherein Y is pdfpageA The point that is the upper left corner of the screen is based on the location of the document.
S4: drawing a document page covered by the layer and position information of the page, and forming a data set by the page and the corresponding position information;
specifically, by means of a recursive loop, how many pages of documents are covered by the drawing layer, and the header of each page of documents corresponds to the relative position of the drawing layer, and forms a data set, in this embodiment, S4 is specifically implemented by the following steps:
s41: acquiring codes of crossed document pages and positions of corresponding drawing layers of the document pages;
specifically, the encoded pageN of the spanned document pages is obtained, and the position (X pageNOffset ,Y pageNOffset ) Typically across multiple document pages.
S42: and forming a data set by encoding the document pages and the positions of the corresponding drawing layers of the document pages in a recursion loop mode.
Specifically, the upward and downward recursions are separated, starting from the middle, which is assumed to be pagen=page, where Y pageNOffset ＝Y cu ，X pageNOffset ＝X cu ；
In the upward recursion process, if the drawing layer spans the whole page of the previous page, Y page(N-1)Offset ＝Y pageNOffset PageLength, where PageLength is the length of the page, Y page(N-1)Offset For the displacement value corresponding to the previous page, recursion loop is continuously performed until the top of the drawing layer only spans a part of a page, which is a recursion loop end mark, and the downward recursion process is the same as above, wherein Y page(N+1)Offset ＝Y pageNOffset +PageLength, after completion of the recursion cycle, all pages covered by the drawing layer and all corresponding X's are finally obtained pageNOffset And Y pageNOffset And form a dataset.
S5: matching the annotation source data stored in the database with the data in the data set to obtain the real position of the annotation source data on the drawing layer, and rendering the annotation source data on the drawing layer.
Specifically, the annotation data to be drawn and displayed is taken out from the database through the data set obtained in S4, and the actual position of each piece of data to be drawn on the layer is calculated through the position of the header of each page of document corresponding to the layer, in this embodiment, S5 is specifically implemented by the following steps:
matching the annotation track input by the user stored in the database on the currently displayed document page with the data in the data set, and taking out the annotation track conforming to the current page and rendering the annotation track on the drawing layer.
Preferably, matching and matching the data in the data set obtained in S4 with the input annotation track of the currently displayed document page by the user stored in the database, and if the page is the same and within the range, taking out the annotation data and performing the matching with (X) pageNOffset ,Y pageNOffset ) Adding to obtain new data, rendering the calculated real data onto the drawing layer and refreshing the page for display, adding the new data to a new container to be rendered, waiting for rendering onto the drawing layer,
preferably, the following steps are further included after S5:
acquiring an instruction of annotating and drawing a currently displayed document page by a user, and storing coordinate points of annotating and drawing as (X=X) screen +X pageNOffset ,Y＝Y screen +Y pageNOffse t), where (X) screen ，Y screen ) For coordinates acquired based on the upper left corner of the control window, (X) pageNOffse ，Y pageNOffset ) For annotating the position of the drawn document page relative to the drawing layer, in particular, if an annotation track is at a different position on the screen, the point (X screen ，Y screen ) The coordinate values from the upper left corner of the screen are not the same. For example, (200, 300) represents the position of this point at 200 pixels on the X-axis, 300 pixels on the Y-axis, and (X pageNOffse ，Y pageNOffset ) Triggered by S2, regenerated. When the user makes annotation drawing across pages (e.g., the current document page is the fifth page), the drawing is performedThe point of the (2) can be continuously separated from the content of the current document page, and is continuously drawn with the upper part and the lower part (the 4 th page and the 6 th page) of the current document page, and simultaneously, the tail part of the previous page and the head part of the next page are continuously annotated, so that continuous cross-page drawing approval is achieved.
In this embodiment, the control window size is 2000×1000 pixels, and the pdf size is 2000×900 pixels for each page; there are multiple pages and the total height is greater than 3 of the control window; the simulated drawing layer size is control width x height x 3 (2000 x 1000 x 3); according to the third page currently displayed, the upper left corner of the control has a coordinate (X ScreenOrigin ，YS creenOrigin ) = (0, 1800), so X pdfOffset ＝0；Y pdfOffset ＝Y ScreenOrigin -control height = 1800-1000 = 800; xcu =0; ycu =y pdfOffset -Y pdfpageA =800-1800 (page length of the second page=1800) = -1000 (representing that the drawing layer is to be moved up 1000 pixels based on the origin of the upper left corner of the page), recursively derived from the above data (pageN, X) pageNOffset 、Y pageNOffset ) The data corresponding to the annotation of the third page to the drawing layer is (3, 0, 1000), which means that the annotation of the third page needs to be drawn from the position of X, y= (0, 1000) for the coordinate X, y= (0, 0) of the drawing layer; upward recursion results (pageN, X pageNOffset 、Y pageNOffset ) = (2, 0, 100), (1, 0, -800), the drawing layer spans a portion of the first page, "-800" means that at the first page of pdf, points whose point coordinates of the original data exceed 800 are displayed at locations where the first page is not fully covered. The same applies to recursion to obtain page 4 (4, 0, 1900), and page 5,0, 2800; information has been derived so far for all pdf pages covered by the drawing layer. If there is one piece of annotation data: the straight line is drawn on the second page, and relative to the origin coordinates (0, 0) of the second page, from X start ，YS tart = (100 ) to X End ，Y End = (300 ). Then this data is converted into data X on the pictorial layer start 、Y Start ＝(100+0，100+100)，X End ，Y End = (300+0, 300+100); 2) A straight line drawn on the fourth page and having a relative coordinate X start ，Y Start = (400, 500), to X End ，Y End = (400, 700), then this piece of data is converted into data X on the drawing layer start 、Y Start ＝(100+0，100+1900)，X End ，Y End = (300+0, 300+1900); the data is converted, but the precondition is that whether the page number of the annotating original data is within the range of the page number of the second point is judged first, and the annotating original data is not directly ignored within the range.
Embodiment two:
a free painting page-crossing drawing and displaying server comprises a storage and a processor;
a memory for storing program instructions;
and the processor is used for running the program instructions to execute the free drawing page-crossing drawing and displaying method according to the first embodiment.
It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the invention as defined in the appended claims.
Claims (8)
1. A free painting page-crossing drawing and displaying method is characterized by comprising the following steps:
s1: setting a drawing layer on a document, wherein the drawing layer is larger than a single page of the document;
s2: judging whether the projection range of the control window exceeds the range of the current drawing layer, if not, returning to the step S2, if so, clearing annotation content displayed on the current drawing layer, and executing the step S3;
s3: acquiring position information of a drawing layer;
s4: drawing a document page covered by the layer and position information of the page, and forming a data set by the page and the corresponding position information;
s5: matching the annotation source data stored in the database with the data in the data set to obtain the real position of the annotation source data on the drawing layer, and rendering the annotation source data on the drawing layer.
2. The free-painting page-crossing drawing and displaying method as claimed in claim 1, wherein S1 is specifically implemented by the steps of:
and a drawing layer is overlapped on the display layer of the document, the drawing layer is as wide as the control window, and the height of the drawing layer is 3 times of the height of the control window or the height of the display layer.
3. The free-painting page-crossing drawing and displaying method as claimed in claim 1, wherein S2 is specifically implemented by the steps of:
judging whether the sliding of the document page meets the first condition: "the upper edge of the control window exceeds the upper edge of the drawing layer" and condition two: and if not, returning to the step S2, and if so, clearing annotation content displayed on the current drawing layer and executing the step S3.
4. The free-painting page-crossing drawing and displaying method as claimed in claim 1, wherein S3 is specifically implemented by the steps of:
s31: acquiring the absolute position of the origin of the current drawing layer in the document;
s32: the relative offset of the current drawing layer based on the current document page is obtained.
5. The free-painting page-crossing drawing and displaying method as claimed in claim 1, wherein S4 is specifically implemented by the steps of:
s41: acquiring codes of crossed document pages and positions of corresponding drawing layers of the document pages;
s42: and forming a data set by encoding the document pages and the positions of the corresponding drawing layers of the document pages in a recursion loop mode.
6. The free-painting page-crossing drawing and displaying method as claimed in claim 1, wherein S5 is specifically implemented by the steps of:
matching the annotation track input by the user stored in the database on the currently displayed document page with the data in the data set, and taking out the annotation track conforming to the current page and rendering the annotation track on the drawing layer.
7. The free-drawing page-crossing drawing and displaying method as claimed in claim 5, further comprising the steps of, after S5:
acquiring an instruction of annotating and drawing a currently displayed document page by a user, and storing coordinate points of annotating and drawing as (X=X) screen +X pageNOffset ,Y＝Y screen +Y pageNOffset ) Wherein (X) screen ，Y screen ) For coordinates acquired based on the upper left corner of the control window, (X) pageNOffse ，Y pageNOffset ) The position of the document page where the annotation is drawn relative to the drawing layer.
8. A free painting page-crossing drawing and displaying server is characterized in that: comprising a memory and a processor;
a memory for storing program instructions;
a processor for executing the program instructions to perform the free-drawing spread drawing and display method of any one of claims 1-8.
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