CN114820884A - Image processing method and device based on Flutter frame and storage medium - Google Patents
Image processing method and device based on Flutter frame and storage medium Download PDFInfo
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Abstract
The embodiment of the invention provides a method and a device for processing pictures based on a Flutter frame and a storage medium, belonging to the technical field of pictures. The method comprises the following steps: acquiring a target picture and a target grid; when a derivation instruction is received, drawing a canvas corresponding to the target grid by using the Flutter frame; and rendering the target pictures on the canvas one by one through the Flutter frame according to the target grid to obtain the grid picture cut off from the screen. The embodiment of the invention is suitable for the grid treatment process of the picture.
Description
Technical Field
The invention relates to the technical field of pictures, in particular to a picture processing method and device based on a Flutter frame and a storage medium.
Background
At present, the template capability of the nine-square grid provided by many Apps in the domestic market generally achieves the effect of the nine-square grid in a mode of synthesizing one picture based on nine pictures, but if a user wants to make the picture of the nine-square grid based on the picture of the local album of the user, the requirement cannot be met.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for processing pictures based on a Flutter frame and a storage medium, wherein a picture is generated into a picture of a specified grid type through a Flutter frame platform, off-screen cutting is realized, and high personalized requirements of users are met.
In order to achieve the above object, in a first aspect, the present invention provides a method for processing an image based on a Flutter framework, including: acquiring a target picture and a target grid; when a derivation instruction is received, drawing a canvas corresponding to the target grid by using the Flutter frame; and rendering the target pictures on the canvas one by one through the Flutter frame according to the target grid to obtain the grid picture cut off from the screen.
In a first possible implementation manner of the first aspect, the obtaining the target picture includes: acquiring a picture to be processed; and receiving the zooming and translating results of the picture to be processed through the Flutterer frame to obtain the target picture.
In a second possible implementation manner of the first aspect, the target grid includes a second grid, a third grid, a fourth grid, a sixth grid, and a ninth grid.
With reference to the first possible implementation manner of the first aspect, in a third possible implementation manner, the method further includes: and after the picture to be processed and the target grid are obtained, drawing and displaying a grid line corresponding to the target grid on the picture to be processed by utilizing the Flutter frame.
With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner, the drawing, by using the Flutter frame, a grid line corresponding to the target grid on the to-be-processed picture includes: obtaining the display height of the picture to be processed according to the display width of the picture to be processed and the number of rows and columns of the target grid; dividing the display height equally by the line number corresponding to the target grid, and drawing a grid line of each line through the Flutter frame; and equally dividing the display width by using the number of the columns corresponding to the target grid, and drawing the grid line of each column through the Flutter frame.
In a fifth possible implementation manner of the first aspect, the drawing, by using the Flutter frame, the canvas corresponding to the target lattice includes: obtaining the display height of the target picture according to the display width of the target picture and the number of rows and columns of the target grid; obtaining the size of each grid of the target grid according to the display width, the display height and the target grid of the target picture; and drawing the canvas by using the Flutter frame according to the size of each grid and the number of the grids of the target grid.
With reference to the third possible implementation manner of the first aspect, in a sixth possible implementation manner, the method further includes: and acquiring a target grid input by switching, and drawing and displaying a grid line corresponding to the target grid input by switching on the picture to be processed by utilizing the Flutter frame.
In a second aspect, the present invention provides a picture processing apparatus based on Flutter framework, including: the acquisition module is used for acquiring a target picture and a target grid; a receiving module for receiving a derivation instruction; the canvas drawing module is used for drawing a canvas corresponding to the target palace lattice by using the Flutter frame when the receiving module receives the derivation instruction; and the off-screen rendering module is used for rendering the target pictures on the canvas one by one through the Flutter frame according to the target grids to obtain the grid pictures after off-screen cutting.
In a first possible implementation manner of the second aspect, the obtaining module is further configured to: acquiring a picture to be processed; and receiving the zooming and translating result of the picture to be processed through the Flutter frame to obtain the target picture.
In a second possible implementation manner of the second aspect, the target grids include a second grid, a third grid, a fourth grid, a sixth grid, and a ninth grid.
With reference to the first possible implementation manner of the second aspect, in a third possible implementation manner, the apparatus further includes a grid line drawing module, configured to draw and display a grid line corresponding to the target grid on the to-be-processed picture by using the Flutter frame after the to-be-processed picture and the target grid are obtained; and the display module is used for displaying the grid lines corresponding to the target grids on the picture to be processed.
With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation manner, the grid line drawing module is further configured to: obtaining the display height of the picture to be processed according to the display width of the picture to be processed and the number of rows and columns of the target grid; dividing the display height equally by the line number corresponding to the target grid, and drawing a grid line of each line through the Flutter frame; and equally dividing the display width by using the number of the columns corresponding to the target grid, and drawing the grid line of each column through the Flutter frame.
In a fifth possible implementation manner of the first aspect, the canvas rendering module is further configured to: obtaining the display height of the target picture according to the display width of the target picture and the number of rows and columns of the target grid; obtaining the size of each grid of the target grid according to the display width, the display height and the target grid of the target picture; and drawing the canvas by using the Flutter frame according to the size of each grid and the number of the grids of the target grid.
With reference to the third possible implementation manner of the first aspect, in a sixth possible implementation manner, the grid line drawing module is further configured to: obtaining a target grid input by switching, and drawing and displaying a grid line corresponding to the target grid input by switching on the picture to be processed by utilizing the Flutter frame; the display module is further used for displaying a grid line corresponding to the target grid input by switching on the picture to be processed.
In a third aspect, the present invention provides a machine-readable storage medium having stored thereon instructions for causing a machine to execute the Flutter framework-based picture processing method as described above.
According to the technical scheme, a picture is generated into a picture of a specified grid type by using the Flutter frame platform, off-screen cutting is realized, and high personalized requirements of users are met. In addition, one set of codes based on the Flutter frame platform can be used on the Android system and the iOS system, and the research and development efficiency is greatly improved.
Additional features and advantages of embodiments of the present invention will be described in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a schematic flowchart of a method for processing an image based on a Flutter frame according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a picture processing apparatus based on a Flutter frame according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another picture processing apparatus based on a Flutter frame according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flowchart illustrating a method for processing an image based on a Flutter frame according to an embodiment of the present invention. As shown in fig. 1, the method comprises the steps of:
102, drawing a canvas corresponding to the target grid by using the Flutter frame when a derivation instruction is received;
and 103, rendering the target pictures on the canvas one by one through the Flutter frame according to the target grids to obtain the grid pictures cut off from the screen.
After the to-be-processed picture selected by the user is obtained, in order to facilitate the user to preview the effect of the to-be-processed picture after cutting, a grid line corresponding to the target grid can be drawn and displayed on the to-be-processed picture by using the Flutter frame after the target grid selected by the user is obtained.
In the embodiment of the invention, the target grids comprise two grids, three grids, four grids, six grids and nine grids. That is, the target grid is several grids, that is, the picture is cut into several equal parts.
Wherein, because the target grids are different, the proportion of each grid in the picture is different. Therefore, the size of each target grid needs to be determined before the off-screen cutting process is performed on the picture. And after the picture to be processed and the target grid are obtained, obtaining the display height of the picture to be processed according to the display width of the picture to be processed and the number of rows and columns of the target grid. Specifically, since the resolution of each to-be-processed picture is different and is influenced by the hardware of the displayed terminal device, the displayed resolution of the picture is also different, and therefore the resolution displayed by the screen width of the terminal is the display width by default. Calculating the display height H of the picture to be processed by the following formula (1):
wherein W is the resolution of the display width of the picture to be processed, L is the number of rows of the target grid, and C is the number of columns of the target grid.
Then, the display height is equally divided by the number of rows corresponding to the target grid, that is, X, Y-axis coordinates of each row can be obtained, and the display width is equally divided by the number of columns corresponding to the target grid, that is, X, Y-axis coordinates of each column can be obtained. Then, drawing the check lines of each row and each column through the Flutter frame. Specifically, the drawing of the grid line is made in the custompaiter class provided based on the flutter. The custompaiter class provides a paint method, the paint method provides a canvas object, and the grid lines can be drawn for each row and each column in sequence based on canvas according to the X, Y axis coordinates of each row and each column obtained above.
Therefore, after the to-be-processed picture and the target grid selected by the user are obtained, the user can preview the cut effect through the grid line displayed on the to-be-processed picture.
In addition, in an implementation manner of the embodiment of the present invention, after a user selects one to-be-processed picture, the user may only want to perform off-screen cutting processing on a part of the to-be-processed picture, so that the scaling and translation results of the to-be-processed picture can be received by the Flutter frame, and a target picture that the end user needs to perform off-screen cutting processing is obtained. Specifically, the rendering tool Widget in the Flutter framework is used to obtain operations of each translation and zooming. The Widget tool is the minimum component in the Flutter framework, and the Widget component describes what the view should be in under the current configuration and state. Because the Widget is the minimum unit, the Widget may be changed every time the Widget is compiled, and the change may cause all other widgets that the Widget depends on to change accordingly, so that the Widget that changes every time refreshes other widgets that do not change may cause poor user experience such as performance deterioration, causing jamming, frame loss, and the like. Therefore, the embodiment of the invention adopts the Element tree to record the change of the Widget. And after the Element tree completes real-time recording, uniformly synchronizing the final result into a renderObject class for rendering. Since the Widget tool with the existing picture processing capability in the Flutter framework cannot achieve the above purpose, in the embodiment of the present invention, a RenderObject is defined to achieve the above purpose. When the picture to be processed is translated and zoomed in the embodiment of the invention, the customized RenderObject is utilized for processing. Wherein the event broker class RenderProxyBox needs to be utilized to distribute the results after the user interaction. For the translation operation, the sliding distance in the X-axis direction for each translation is accumulated, and the sliding distance in the Y-axis direction for each translation is accumulated. For the zoom operation, the zoom ratio for each move is multiplied. And then, repeatedly calculating the obtained offset and the obtained scaling quantity based on handleEvent, and then triggering an engine to refresh the whole Element tree by calling a markneedledsPlaint method of a renderObject so as to refresh the page to achieve the effects of scaling and translation.
And in the process that the user performs translation and zooming operations on the picture to be processed, the grid lines are displayed on the picture in the translation and zooming process and the picture after the translation and zooming process according to the setting of the target grid.
In addition, when the user switches different target lattices, the target lattices input by the user through switching are continuously obtained, and the lattice lines corresponding to the target lattices input through switching are drawn and displayed on the picture to be processed by using the Flutter frame.
In step 102, when a user's derivation instruction for the selected target picture and the target lattice is received, drawing a canvas corresponding to the target lattice by using the Flutter frame. Specifically, the display height of the target picture is obtained according to the display width of the current target picture and the number of rows and columns of the target grid by using the formula (1). Then, obtaining the size of each grid of the target grid according to the display width, the display height and the target grid of the target picture, and drawing the canvas by using the Flutter frame according to the size of each grid and the number of the grids of the target grid. Specifically, when the target picture is drawn on a canvas, a pictureregister object needs to be created as a carrier to create a canvas object, so as to record data of the drawn picture, and after the canvas object draws the picture, the recording is finished by a pictureregister.
The user uses different scenes for the grid pictures after off-screen cutting, so that off-screen cutting is performed based on different target grid numbers when cutting is performed, for example, a gourmet friend circle can use nine grids to cut the picture contents off-screen, and poster publicity only needs to use four grids to cut the picture contents off-screen. When a user's export instruction is received, a target picture and a target grid which need to be subjected to off-screen rendering are determined, and the off-screen cutting of the target picture one by one can be performed according to the number of the grids of the target grid and the size of each grid. According to a target picture under a target grid shown by a preview for a user, the target grid has several rows and columns, and the target picture is subjected to off-screen cutting for many times based on the several rows and columns in the off-screen cutting process. And rendering a corresponding image with the size of the palace lattice on the screen off by using the picturedecoder and the size of the palace lattice under the dart, ui packet in the Flutter frame, thereby obtaining the image of the palace lattice after the screen off cutting.
According to the embodiment of the invention, a picture is generated into a picture of a specified grid type by using the Flutter frame platform, off-screen cutting is realized, and high personalized requirements of users are met. In addition, one set of codes based on the Flutter frame platform can be used on the Android system and the iOS system, and the research and development efficiency is greatly improved.
Correspondingly, fig. 2 is a schematic structural diagram of an image processing apparatus based on a Flutter frame according to an embodiment of the present invention. As shown in fig. 2, the apparatus 20 includes: the acquisition module 21 is used for acquiring a target picture and a target grid; a receiving module 22, configured to receive a derivation instruction; the canvas drawing module 23 is configured to draw a canvas corresponding to the target grid by using the Flutter frame when the receiving module receives the derivation instruction; and the off-screen rendering module 24 is configured to render the target pictures on the canvas one by one through the Flutter frame according to the target grid, so as to obtain the grid pictures after off-screen cutting.
Further, the obtaining module is further configured to: acquiring a picture to be processed; and receiving the zooming and translating result of the picture to be processed through the Flutter frame to obtain the target picture.
Wherein the target grids comprise a second grid, a third grid, a fourth grid, a sixth grid and a ninth grid.
Further, as shown in fig. 3, the apparatus further includes a grid line drawing module 25, configured to draw and display a grid line corresponding to the target grid on the to-be-processed picture by using the Flutter frame after the to-be-processed picture and the target grid are obtained; and a display module 26, configured to display a grid line corresponding to the target grid on the to-be-processed picture.
Further, the grid line drawing module is further configured to: obtaining the display height of the picture to be processed according to the display width of the picture to be processed and the number of rows and columns of the target grid; dividing the display height equally by the line number corresponding to the target grid, and drawing a grid line of each line through the Flutter frame; and equally dividing the display width by using the number of the columns corresponding to the target grid, and drawing the grid line of each column through the Flutter frame.
Further, the canvas drawing module is further to: obtaining the display height of the target picture according to the display width of the target picture and the row number and column number of the target grid; obtaining the size of each grid of the target grid according to the display width, the display height and the target grid of the target picture; and drawing the canvas by using the Flutter frame according to the size of each grid and the number of the grids of the target grid.
Further, the grid line drawing module is further configured to: obtaining a target grid input by switching, and drawing and displaying a grid line corresponding to the target grid input by switching on the picture to be processed by utilizing the Flutter frame; the display module is further used for displaying the grid lines corresponding to the target grids input by switching on the picture to be processed.
The specific working principle and benefits of the Flutter frame-based image processing apparatus provided by the embodiment of the present invention are similar to those of the Flutter frame-based image processing method provided by the embodiment of the present invention, and will not be described herein again.
In addition, another aspect of the embodiments of the present invention further provides a machine-readable storage medium, where the machine-readable storage medium has instructions stored thereon, and the instructions are configured to cause a machine to execute the Flutter framework-based picture processing method described in the foregoing embodiments.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A picture processing method based on a Flutter frame is characterized by comprising the following steps:
acquiring a target picture and a target grid;
when a derivation instruction is received, drawing a canvas corresponding to the target grid by using the Flutter frame;
and rendering the target pictures on the canvas one by one through the Flutter frame according to the target grid to obtain the grid picture cut off from the screen.
2. The Flutter frame-based picture processing method according to claim 1, wherein the obtaining a target picture comprises:
acquiring a picture to be processed;
and receiving the zooming and translating result of the picture to be processed through the Flutter frame to obtain the target picture.
3. The Flutter frame-based picture processing method according to claim 1, wherein the target lattices include two lattices, three lattices, four lattices, six lattices, and nine lattices.
4. The Flutter frame-based picture processing method according to claim 2, further comprising:
and after the picture to be processed and the target grid are obtained, drawing and displaying a grid line corresponding to the target grid on the picture to be processed by utilizing the Flutter frame.
5. The Flutter frame-based picture processing method according to claim 4, wherein the drawing a frame corresponding to the target frame on the picture to be processed using the Flutter frame comprises:
obtaining the display height of the picture to be processed according to the display width of the picture to be processed and the number of rows and columns of the target grid;
dividing the display height equally by the line number corresponding to the target grid, and drawing a grid line of each line through the Flutter frame;
and equally dividing the display width by using the number of the columns corresponding to the target grid, and drawing the grid line of each column through the Flutter frame.
6. The Flutter frame-based picture processing method according to claim 1, wherein the drawing the canvas corresponding to the target pane by using the Flutter frame comprises:
obtaining the display height of the target picture according to the display width of the target picture and the number of rows and columns of the target grid;
obtaining the size of each grid of the target grid according to the display width, the display height and the target grid of the target picture;
and drawing the canvas by using the Flutter frame according to the size of each grid and the number of the grids of the target grid.
7. The Flutter frame-based picture processing method according to claim 4, further comprising:
and acquiring a target grid input by switching, and drawing and displaying a grid line corresponding to the target grid input by switching on the picture to be processed by utilizing the Flutter frame.
8. A picture processing apparatus based on a Flutter framework, comprising:
the acquisition module is used for acquiring a target picture and a target grid;
a receiving module for receiving a derivation instruction;
the canvas drawing module is used for drawing a canvas corresponding to the target palace lattice by using the Flutter frame when the receiving module receives the derivation instruction;
and the off-screen rendering module is used for rendering the target pictures on the canvas one by one through the Flutter frame according to the target grids to obtain the grid pictures after off-screen cutting.
9. The Flutter framework-based picture processing apparatus according to claim 8, wherein the obtaining module is further configured to:
acquiring a picture to be processed;
and receiving the zooming and translating result of the picture to be processed through the Flutter frame to obtain the target picture.
10. A machine-readable storage medium having stored thereon instructions for causing a machine to execute the Flutter framework based picture processing method of any one of claims 1 to 7.
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| CLEVEN1: "Flutter-CLFlow", pages 2 - 7, Retrieved from the Internet <URL:https://github.com/cleven1/Flutter-CLFlow> * |
| YELIULEE: "thinkerx_mobile / lib / pages / tools / nine_grid_image.dart", pages 1 - 7, Retrieved from the Internet <URL:https://github.com/yeliulee/thinkerx_mobile/blob/2e66ceeacbadb039192bb45a6a3dd4e6880a374a/lib/pages/tools/nine_grid_image.dart#L152> * |
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