CN109960478B - Web map printing preview method and device - Google Patents
Web map printing preview method and device Download PDFInfo
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- CN109960478B CN109960478B CN201910261047.6A CN201910261047A CN109960478B CN 109960478 B CN109960478 B CN 109960478B CN 201910261047 A CN201910261047 A CN 201910261047A CN 109960478 B CN109960478 B CN 109960478B
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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
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
- G06F3/1203—Improving or facilitating administration, e.g. print management
- G06F3/1205—Improving or facilitating administration, e.g. print management resulting in increased flexibility in print job configuration, e.g. job settings, print requirements, job tickets
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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
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1223—Dedicated interfaces to print systems specifically adapted to use a particular technique
- G06F3/1237—Print job management
- G06F3/1253—Configuration of print job parameters, e.g. using UI at the client
- G06F3/1256—User feedback, e.g. print preview, test print, proofing, pre-flight checks
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Abstract
The invention relates to a Web map printing preview method and a Web map printing preview device. The method comprises the following steps: a coordinate acquisition step, namely acquiring a space coordinate point array corresponding to a map range to be printed, and converting the space coordinate point array into a screen coordinate point array; the map layer obtaining step, namely obtaining image tag arrays under DOM father nodes of all service map layers in the current map container and converting the image tag arrays into image data addresses; a picture dividing step, namely cutting pictures corresponding to the picture data addresses into pictures to be printed according with the coordinate point array range from the pictures corresponding to the picture data addresses according to the screen coordinate point array range; and a printing preview step, namely displaying the picture to be printed on a window, realizing preview before printing, intercepting a printing range, and selecting a printer to print the intercepted picture. Therefore, the invention can complete the user-defined range of the Web map at the client by one key, and the Web map is intercepted and printed out.
Description
Technical Field
The invention relates to a print preview method and device, belongs to the field of GIS (geographic information system) processing, and particularly relates to a Web map print preview method and device.
Background
With the continuous update of internet technology and the advent of HTML5, Web map application systems based on HTML5 have been rapidly developed, and map application systems based on rich client (e.g., Flex \ Silverlight) technology are gradually eliminated. At present, a map application system in a Web environment often has a requirement that a user-defined range of a Web map is printed and output as a paper map at a client, and after the paper map is printed, a user can scrawl and mark the paper map so as to facilitate further communication and brainstorming.
Some currently mainstream Web map engine manufacturers, such as ArcGIS \ SuperMap, provide some map printing schemes, and provide that the map is printed by calling a service, so as to implement printing of the current map display range, but such a printing method has the following disadvantages:
(1) the printing range of the map is limited, only the printing of the current map display range is supported, and the printing of the user-defined range is not supported;
(2) the service layer of the map printing is limited, only the map service printing released by the product of the user is supported, and other open service resources and user data dynamically drawn or rendered by the client are not supported;
(3) the map printing mode is complicated, and the parameters of the printing template need to be configured.
Therefore, it is a technical problem that needs to be solved urgently at present to improve a map printing mode in the prior art to meet the requirements of different application scenes.
Disclosure of Invention
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
The invention mainly aims to solve the technical problems of complicated printing template configuration, limited printing map range and limited printing map service layer in the prior art, and provides a Web map printing preview method and a Web map printing preview device. The method and the device can meet the requirement that a user can print the map within the user-defined range at the client without complicated configuration, and support the map printing of all map service resources meeting the OGC standard and user data dynamically drawn or rendered by the client.
In order to solve the problems, the scheme of the invention is as follows:
a Web map print preview method based on HTML5, comprising the steps of:
a coordinate acquisition step, namely acquiring a space coordinate point array corresponding to a map range to be printed, and converting the space coordinate point array into a screen coordinate point array;
the map layer obtaining step, namely obtaining image tags under DOM father nodes of all service map layers in a current map container, constructing an image tag array, and converting the image tag array into a picture data address;
and a picture segmentation step, namely intercepting the picture to be printed according with the coordinate point array range from the picture corresponding to the picture data address according to the screen coordinate point array range.
Preferably, in the coordinate acquiring step, the acquisition of the map range to be printed is as follows:
drawing a map range to be printed by a user according to a map drawing tool, and taking the map range displayed on the current screen as the map range to be printed when the user does not select;
and obtaining all spatial coordinate point arrays according to the surface elements of the range of the map to be printed.
Preferably, the layer obtaining step specifically includes:
acquiring DOM father nodes of all service layers contained in a current map container by a DOM node searching method of HTML;
searching all img tags of picture nodes used for displaying a map service layer under the DOM father node to obtain an img tag array;
traversing the img label array, judging whether the picture address of the img label is in a domain with the current system address, and if not, adding a proxy address in front of the address of the img label;
converting the HTML node into a canvas element based on an open source plug-in of HTML 5;
the canvas toDataURL method is called to convert the canvas element to a 64-bit bitmap tile data address.
Preferably, the image segmentation step specifically includes:
transmitting the screen coordinate point array and the picture data address to a server side for picture interception processing;
and intercepting the picture corresponding to the picture data address into a picture to be printed matched with the coordinate point array range at the server according to the screen coordinate point array range, and returning the data address of the picture to be printed to the front end.
Preferably, the method further comprises the following steps: the printing preview step specifically comprises the following steps:
displaying the data address of the picture to be printed on a window to realize previewing before printing;
after previewing, if the intercepted range is confirmed to be correct, selecting a printer to print the intercepted picture, or selecting and outputting the picture as a PDF picture to a local computer; if the capture range is incorrect, the printout may be cancelled.
A Web map print preview device based on HTML5, comprising the following modules:
the coordinate acquisition module is used for acquiring a space coordinate point array corresponding to the range of the map to be printed and converting the space coordinate point array into a screen coordinate point array;
the map layer acquisition module is used for acquiring image tags under DOM father nodes of all service map layers in the current map container, constructing an image tag array and converting the image tag array into a picture data address;
and the picture segmentation module is used for intercepting the picture to be printed which accords with the coordinate point array range from the picture corresponding to the picture data address according to the screen coordinate point array range.
Preferably, in the coordinate acquiring module, the acquisition of the map range to be printed is as follows:
drawing a map range to be printed by a user according to a map drawing tool, and taking the map range displayed on the current screen as the map range to be printed when the user does not select;
and obtaining all spatial coordinate point arrays according to the surface elements of the range of the map to be printed.
Preferably, the layer acquiring module specifically includes:
the map layer acquisition unit acquires DOM father nodes of all service map layers contained in the current map container by using a DOM node searching method of HTML; searching all img tags of picture nodes used for displaying a map service layer under the DOM father node to obtain an img tag array;
the cross-domain processing unit is used for traversing the img label array, judging whether the picture address of the img label is in one domain with the current system address, and if not, adding the proxy address in front of the address of the img label;
the picture conversion unit converts the HTML node into a canvas element based on an open source plug-in of HTML 5; the canvas toDataURL method is called to convert the canvas element to a 64-bit bitmap tile data address.
Preferably, the picture segmentation module transmits the screen coordinate point array and the picture data address to a server side for picture interception processing; and intercepting the picture corresponding to the picture data address into a picture to be printed matched with the coordinate point array range at the server according to the screen coordinate point array range, and returning the data address of the picture to be printed to the front end.
Preferably, the method further comprises the following steps: the printing preview module displays the data address of the picture to be printed to a window to realize preview before printing; after previewing, if the intercepted range is confirmed to be correct, selecting a printer to print the intercepted picture, or selecting and outputting the picture as a PDF picture to a local computer; if the capture range is incorrect, the printout may be cancelled.
Therefore, the invention has the advantages that: the invention provides a plurality of self-defining modes such as circle selection, moment selection, polygon selection, administrative district and the like in the Web map based on HTML5 to set the map printing range, and prints all map services in the Web map and user data rendered by a client into a paper map without configuring a printing template, and a user can complete the self-defining range interception, printing and output of the Web map at the client by one key, so that what you see is what you get.
Drawings
The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments of the present invention and, together with the description, further serve to explain the principles of the invention and to enable a person skilled in the pertinent art to make and use the disclosure.
Fig. 1 is a flowchart of a method for printing a preview of a Web map based on HTML5 according to an embodiment of the present invention.
Fig. 2 is a structural diagram of an apparatus for Web map print preview based on HTML5 according to an embodiment of the present invention.
Embodiments of the present invention will be described with reference to the accompanying drawings.
Detailed Description
The first embodiment is as follows:
as shown in fig. 1, a method for Web map print preview based on HTML5 provided by the embodiment of the present invention includes the following steps:
and step S1, the user draws a range or a selection range on the map, if not, the default is the full map range of the currently displayed map, and a specific spatial coordinate point array on the map range is obtained.
The printing range can be drawn by a map drawing tool in a circle, rectangle, polygon and other modes, or the printing range can be acquired by selecting a certain administrative region, and if the printing range is not selected, the default is the map range displayed on the current screen.
Further, according to the surface element in this range, the surface element is composed of a plurality of points and lines, and all the lines and points constituting the surface element are analyzed to obtain an array of all the coordinate points.
And step S2, converting each coordinate point of the map range into a screen coordinate point through a conversion formula of the map and the screen coordinate to form a screen coordinate point array.
The conversion formula is as follows:
screenPt.x＝screen.center.x+((mapPt.x-mapExtent.center.x)/res olution+0.5)；
screenPt.y＝screen.center.y-(mapPt.y-mapExtent.center.y)/reso lution+0.5)；
center is the screen center coordinate, screen is the converted screen point coordinate, mapxtent center is the map center coordinate, mapPt is the map point coordinate before conversion, resolution is the map resolution, and the actual meaning represents how many map units are represented by 1 pixel within the current map range.
Each map coordinate point is converted to a screen point coordinate by cycling the map coordinate point array, then forming a screen coordinate point array.
And step S3, acquiring DOM father nodes of all service layers contained in the current map container by a node searching method of the DOM (document object model) of the HTML.
And viewing all HTML nodes of the map page in the browser, finding out node ids containing all service layers, such as DIV nodes with id being map _ layers in the embodiment, and searching a DOM node provided by HTML.
Get document metadata id (map _ layers), which can be obtained to the DOM node, here named divLayers.
And step S4, searching all img (picture nodes for displaying map service layers) tags under the DOM parent node to obtain an img tag array.
The method for searching the sub-tags through HTML is used for obtaining an array with all sub-nodes being img tags, and the specific method is as follows:
divLayers.getElementByTagName(“img”)；
step S5, circulating the img label array, judging whether the picture address of the img label is in a domain with the current system address, if not, adding a proxy address in front of the address of the img label to prevent the problem of printing map blank caused by cross-domain; if in one domain, no processing is required.
The method for determining the cross-domain is as follows, the domain originUrl of the system is obtained by window.
Step S6, after step S5 is completed, the method for converting HTML nodes into canvas (the label of the drawing graph provided by HTML 5) by one key provided by HTML2canvas (open source plug-in based on HTML 5) is called, and a new canvas element is obtained.
Js plug-in is an open source plug-in based on HTML5, and provides a method for converting an HTML webpage into a canvas, which has the disadvantage that when a cross-domain link address exists under a node, the problem of conversion failure occurs, and steps S4 and S5 are to solve the cross-domain problem. The method is characterized in that html2canvas.js is introduced into a main page, and a html2canvas (divLayers) method is directly called to obtain transformed canvas elements canvas Layers.
Step S7, call the toDataURL method of the canvas to convert the canvas element obtained in step S6 into a 64-bit bitmap data address.
The canvas element canvas layers obtained directly calls the method built in canvas, canvas layers, dataurl (), and 64-bit picture data addresses can be obtained.
The 64-bit bitmap sheet format is as follows:
data:image/png；base64,iVBORw0KGgoAAAANSUhEUgAABSUAAAO2CAYAAA Ae0/IxAAAgAElEQVR4XoS9B7gsV3UlvKqrujrH2zfHd/……
and step S8, transmitting the screen coordinate point array obtained in the step S2 and the 64-bit bitmap data address obtained in the step S7 to a server side for picture capturing processing.
In the step, an interface of the server is mainly called in the front-end map, the results obtained in the step S2 and the step S7 are transmitted to the server, and the next picture capturing operation is performed in the server.
And step S9, intercepting the picture into a picture conforming to the coordinate point range according to the screen coordinate point array range at the server side, and returning the intercepted picture data address to the front end.
The server can be written by a C #/Java language, the C # language used in the embodiment is written by mainly using drawing interfaces such as System.
And step S10, displaying the intercepted picture data address to a window to realize the preview before printing.
The steps are simple, and the picture returned by the server side is rendered at the front end mainly through the img label for the user to preview.
And step 11, after previewing, the user can select a printer to print or output the PDF picture to be stored locally.
After previewing, if the intercepted range is confirmed to be correct, a printer can be selected to print the intercepted picture, or a PDF picture is selected to be output to a local computer and then is selected to be printed; if the clipped range is not the desired range, the printout can be canceled, and the process returns to step S1 to continue the operation.
Example two:
as shown in fig. 2, an apparatus for Web map print preview based on HTML5 provided by an embodiment of the present invention is used for implementing a Web map print preview method based on HTML5 provided by the present invention, and the apparatus for Web map print preview based on HTML5 includes the following units:
and the coordinate acquisition module is used for drawing a map range on the map or selecting the map range to obtain a screen coordinate information array in the selected range.
The layer obtaining module: the method is used for converting the map layer into canvas and then converting the canvas into a picture;
and the picture segmentation module is used for intercepting the pictures meeting the range at the server according to the coordinate range.
A print preview module: the printer is used for rendering the processed pictures for previewing, and a user can select the printer for printing and can also directly output the pictures as PDF pictures.
The coordinate acquisition module comprises the following units:
a map range setting unit: the method is used for drawing a printing range on the map in a circle, rectangle, polygon and other modes, or setting the printing range by selecting a certain administrative region, and if the range is not selected, the default is the map range displayed on the current screen.
A coordinate information acquisition unit: and the screen coordinate information array is used for obtaining a range space coordinate information array according to the set map range and further converting the range space coordinate information array to obtain the map range.
As a specific structure of the layer acquisition module, the structure includes the following units:
an image layer acquisition unit: the method is used for searching the HTML nodes containing all map layers in the map and further acquiring the arrays of all img labels under the nodes.
A cross-domain processing unit: the method comprises the steps that an array of obtained img labels is circularly judged, if the array is not in a domain with a system address, a proxy address needs to be added in front of an img original address, and cross-domain processing is carried out; if in a domain, no processing is performed.
A picture conversion unit: the method is used for converting the HTML nodes containing all map layers into canvas elements by calling the HTML2canvas open source plug-in. A further method of invoking a canvas converts the canvas element to a 64-bit bitmap tile data address.
The functional modules and the functional units correspondingly implement the steps in the first embodiment, and the specific implementation process is not described herein again.
In this embodiment, while, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as may be understood by those of ordinary skill in the art.
It is noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A Web map print preview method is characterized by comprising the following steps:
a coordinate acquisition step, namely acquiring a space coordinate point array corresponding to a map range to be printed, and converting the space coordinate point array into a screen coordinate point array;
the map layer obtaining step, namely obtaining image tags under DOM father nodes of all service map layers in a current map container, constructing an image tag array, and converting the image tag array into a picture data address;
a picture dividing step, namely cutting pictures corresponding to the picture data addresses into pictures to be printed according with the screen coordinate point array range from the pictures corresponding to the picture data addresses;
wherein, in the layer obtaining step, the method specifically comprises the following steps:
acquiring DOM father nodes of all service layers contained in a current map container by a DOM node searching method of HTML;
searching all img tags of picture nodes used for displaying a map service layer under the DOM father node to obtain an img tag array;
traversing the img label array, judging whether the picture address of the img label is in a domain with the current system address, and if not, adding a proxy address in front of the address of the img label; converting the HTML node into a canvas element based on an open source plug-in of HTML 5;
the canvas toDataURL method is called to convert the canvas element to a 64-bit bitmap tile data address.
2. The Web map print preview method according to claim 1, wherein in the coordinate acquiring step, the range of the map to be printed is acquired by:
drawing a map range to be printed by a user according to a map drawing tool, and taking the map range displayed on the current screen as the map range to be printed when the user does not select;
and obtaining all spatial coordinate point arrays according to the surface elements of the range of the map to be printed.
3. The method for printing and previewing a Web map according to claim 1, wherein the picture dividing step specifically comprises:
transmitting the screen coordinate point array and the picture data address to a server side for picture interception processing;
and intercepting the picture corresponding to the picture data address into a picture to be printed matched with the screen coordinate point array range at the server according to the screen coordinate point array range, and returning the data address of the picture to be printed to the front end.
4. The Web map print preview method according to claim 1, further comprising: the printing preview step specifically comprises the following steps:
displaying the data address of the picture to be printed on a window to realize previewing before printing;
after previewing, if the intercepted range is confirmed to be correct, selecting a printer to print the intercepted picture, or selecting and outputting the picture as a PDF picture to a local computer; if the capture range is incorrect, the printout may be cancelled.
5. A Web map print preview apparatus characterized by comprising the following modules:
the coordinate acquisition module is used for acquiring a space coordinate point array corresponding to the range of the map to be printed and converting the space coordinate point array into a screen coordinate point array;
the map layer acquisition module is used for acquiring image tags under DOM father nodes of all service map layers in the current map container, constructing an image tag array and converting the image tag array into a picture data address;
the picture segmentation module is used for intercepting a picture to be printed which accords with the screen coordinate point array range from the picture corresponding to the picture data address according to the screen coordinate point array range;
the layer obtaining module specifically includes:
the map layer acquisition unit acquires DOM father nodes of all service map layers contained in the current map container by using a DOM node searching method of HTML; searching all img tags of picture nodes used for displaying a map service layer under the DOM father node to obtain an img tag array;
the cross-domain processing unit is used for traversing the img label array, judging whether the picture address of the img label is in one domain with the current system address, and if not, adding the proxy address in front of the address of the img label;
the picture conversion unit converts the HTML node into a canvas element based on an open source plug-in of HTML 5; the canvas toDataURL method is called to convert the canvas element to a 64-bit bitmap tile data address.
6. The apparatus for printing and previewing a Web map according to claim 5, wherein in said coordinate acquiring module, the range of the map to be printed is acquired by:
drawing a map range to be printed by a user according to a map drawing tool, and taking the map range displayed on the current screen as the map range to be printed when the user does not select;
and obtaining all spatial coordinate point arrays according to the surface elements of the range of the map to be printed.
7. The apparatus for printing and previewing a Web map according to claim 5, wherein said picture dividing module transmits said screen coordinate point array and said picture data address to a server for picture capturing; and intercepting the picture corresponding to the picture data address into a picture to be printed matched with the screen coordinate point array range at the server according to the screen coordinate point array range, and returning the data address of the picture to be printed to the front end.
8. The Web map print preview device according to claim 5, further comprising: the printing preview module displays the data address of the picture to be printed to a window to realize preview before printing; after previewing, if the intercepted range is confirmed to be correct, selecting a printer to print the intercepted picture, or selecting and outputting the picture as a PDF picture to a local computer; if the capture range is incorrect, the printout may be cancelled.
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| CN110399105B (en) * | 2019-07-18 | 2022-11-22 | 福建威盾科技集团有限公司 | Method and system for printing map page |
| CN111159594A (en) * | 2019-12-24 | 2020-05-15 | 深圳市优必选科技股份有限公司 | Information processing method, information processing device and terminal equipment |
| CN111259094B (en) * | 2020-01-08 | 2022-09-06 | 浪潮通信信息系统有限公司 | Drawing exporting method based on external line resources |
| CN112464307A (en) * | 2020-10-16 | 2021-03-09 | 北京居理科技有限公司 | Paper map derivation method of house finding tool |
| CN112783996B (en) * | 2021-01-11 | 2022-11-29 | 重庆数地科技有限公司 | Method for synthesizing user-defined map tags in batch at front end |
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