CN115357415A - Qt-based classification drawing method and device - Google Patents
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Abstract
The invention discloses a Qt-based classification drawing method and a device, wherein the method comprises the following steps: segmenting each line on the selected picture according to a preset segmentation distance to obtain a plurality of lines; acquiring position information of the selected picture and position information of each line segment, and keeping a selected state for the line segment in the range of the graphic element to which the selected picture belongs; acquiring external event information from the interactive information, and triggering and classifying the external events according to the external event information; and calling a function of corresponding classification according to the trigger classification result to perform event processing on the external event. By adopting the embodiment of the invention, various line data can be completely identified and processed, and the delay caused by event conversion is eliminated by adopting event classification processing.
Description
Technical Field
The invention relates to the field of Qt image processing, in particular to a Qt-based classification drawing method and device.
Background
The existing drawing equipment is not comprehensive enough for classifying drawn lines on a picture, and generally, the lines have three states: across the picture, the starting point is on the picture and the ending point is on the picture. However, the classification method adopted by the existing equipment can only identify the latter two cases, neglect the first case, and cause the deficiency of the drawing elements.
In addition, the existing drawing equipment generally performs unified processing on the mouse event and the touch event, which may affect the usability to a certain extent, especially on a 4k display screen, if the system converts the mouse event into the touch event and draws, a relatively serious drawing delay phenomenon may be generated.
Disclosure of Invention
The embodiment of the invention provides a Qt-based classification drawing method and a Qt-based classification drawing device, which can completely identify and process various line data and eliminate delay caused by event conversion by adopting event classification processing.
To achieve the above object, a first aspect of the embodiments of the present application provides a Qt-based classification drawing method, including:
segmenting each line on the selected picture according to a preset segmentation distance to obtain a plurality of lines;
acquiring position information of the selected picture and position information of each line segment, and keeping a selected state for the line segment in the range of the graphic element to which the selected picture belongs;
acquiring external event information from the interactive information, and triggering and classifying the external events according to the external event information;
and calling a function of corresponding classification according to the trigger classification result to perform event processing on the external event.
In a possible implementation manner of the first aspect, the triggering and classifying the external event according to the external event information specifically includes:
and classifying the external event into a mouse event or a touch event according to the triggering condition of the external event.
In a possible implementation manner of the first aspect, after the obtaining external event information from the interaction information and performing trigger classification on the external event according to the external event information, the method further includes:
reading the event type and the release event of the external event information; the event types include drawing events and movement events.
In a possible implementation manner of the first aspect, the invoking a function of a corresponding classification according to a trigger classification result to perform event processing on the external event specifically includes:
and if the external event is a moving event, moving the picture elements and the line segment elements in the primitive range to which the selected picture belongs together, and stopping the event processing when a release event occurs.
In a possible implementation manner of the first aspect, the invoking a function of a corresponding classification according to a trigger classification result to perform event processing on the external event specifically includes:
if the external event is a drawing event, creating a canvas primitive and a cache primitive and taking the cache primitive as a sub-primitive of the canvas primitive;
converting a drawing path into vector drawing on the cache primitive by using a brush module according to the drawing path in the external event;
when a release event occurs, the vector drawing is converted to a vector drawing on the canvas primitive using a brush module.
A second aspect of the embodiments of the present application provides a Qt-based classification and drawing device, including:
the segmentation module is used for segmenting each line on the selected picture according to a preset segmentation distance to obtain a plurality of lines;
the selection module is used for acquiring the position information of the selected picture and the position information of each line segment and keeping the selected state of the line segment in the range of the graphic element to which the selected picture belongs;
the classification module is used for acquiring external event information from the interaction information and performing trigger classification on the external events according to the external event information;
and the processing module is used for calling the function of the corresponding classification according to the trigger classification result to perform event processing on the external event.
In a possible implementation manner of the second aspect, the classification module is specifically configured to:
and classifying the external event into a mouse event or a touch event according to the triggering condition of the external event.
In a possible implementation manner of the second aspect, the apparatus further includes a reading module; the reading module is used for reading the event type and the release event of the external event information; the event types include drawing events and movement events.
In a possible implementation manner of the second aspect, the mobile processing subunit in the processing module is configured to:
and if the external event is a moving event, moving the picture elements and the line segment elements in the primitive range to which the selected picture belongs together, and stopping the event processing when a release event occurs.
In a possible implementation manner of the second aspect, the drawing processing subunit in the processing module is configured to:
if the external event is a drawing event, creating a canvas primitive and a cache primitive and taking the cache primitive as a sub-primitive of the canvas primitive;
converting the drawing path into vector drawing on the cache primitive by using a brush module according to the drawing path in the external event;
when a release event occurs, the vector drawing is converted to a vector drawing on the canvas primitive using a brush module.
Compared with the prior art, the classification drawing method and device based on Qt provided by the embodiment of the invention have the advantages that the primitive information is obtained according to the position of the selected picture in a way of comparing the lines in a segmentation mode, the primitive range of the picture is compared with the position of each line segment when the picture is selected, only the effective line segment in the primitive range is processed, and the subsequent instruction is executed without selecting the irrelevant line segment. In response to an external movement event, the line segments that will satisfy the common movement move the same as the picture. When a drawing event is responded, the vector drawing is carried out by using the brush module in the buffer primitive, the repeated refreshing of the primitive is avoided, and the vector drawing is only used for displaying in the drawing line, so that the refreshing of the intersected primitive cannot be caused before the vector drawing of the canvas primitive is carried out finally.
In addition, through reasonable classification of external events, touch events and mouse events can be processed respectively after classification, and delay caused by event conversion is eliminated.
Drawings
Fig. 1 is a flowchart illustrating a Qt-based classification drawing method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a classification drawing method based on Qt, including:
s10, segmenting each line on the selected picture according to a preset segmentation distance to obtain a plurality of lines.
S11, obtaining the position information of the selected picture and the position information of each line segment, and keeping the selected state of the line segment in the range of the graphic element to which the selected picture belongs.
And S12, acquiring external event information from the interactive information, and triggering and classifying the external events according to the external event information.
And S13, calling a function of corresponding classification according to the trigger classification result to perform event processing on the external event.
The embodiment of the invention adopts a mode of comparing the lines in segments, when the picture is selected, the picture position is compared with the position of each stored word line segment, if the line segment information in a piece of complete line information stored in a QList class meets the condition of being contained in the picture area, the line segment is proved to be in the picture, and the line segment integrally moves as same as the picture if the condition of common movement is met.
And after the segmentation identification, the line segments meeting the conditions are added into the processing object, so that the processed line segment object is enlarged, the line segments passing through the picture are covered, and the effect of moving the effective lines on the picture layer together can be realized when the picture is dragged.
Particularly, when comparing the primitive range to which the selected picture belongs with the positions of the line segments, the contacts function can be called to judge whether the points in the line segments exist in the range of the item of the picture, and if the function is returned to 1, the judgment is made, or:
QGraphicsItem::collidesWithPath(const QPainterPath &path, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape)；
then, the comparison mode is set as follows: and Qt, returning to 1 when the primitive completely comprises the line path, and putting the primitive into data needing to be moved.
Exemplarily, S12 specifically includes:
and classifying the external event into a mouse event or a touch event according to the triggering condition of the external event.
And (3) performing independent processing on the touch event and the mouse event, judging the event on a window interface, and distributing the event to the mouse or performing corresponding processing under the touch event. Because the touch event and the mouse event are processed respectively, the delay caused by event conversion can be effectively eliminated.
Exemplarily, S12 is followed by:
reading the event type and the release event of the external event information; the event types include drawing events and movement events.
Exemplarily, S13 specifically includes:
and if the external event is a moving event, moving the picture elements and the line segment elements in the primitive range to which the selected picture belongs together, and stopping the event processing when a release event occurs.
Exemplarily, S13 specifically includes:
if the external event is a drawing event, creating a canvas primitive and a cache primitive and taking the cache primitive as a sub-primitive of the canvas primitive;
converting the drawing path into vector drawing on the cache primitive by using a brush module according to the drawing path in the external event;
when a release event occurs, the vector drawing is converted to a vector drawing on the canvas primitive using a brush module.
Qpainter class has a wide application range, QWidget is often used as drawing equipment, the refreshing mechanism of QWidget is window type refreshing, and the whole window can be rendered each time to achieve the refreshing purpose. Rendering operations are all done by the main thread, so frequent refreshes can severely impact performance. The appearance of the double-buffering idea greatly reduces the refreshing frequency, introduces a temporary layer as drawing equipment in the drawing process, and eliminates repeated drawing. The QGraphicssene refreshing mechanism refreshes the lines by taking QGraphicitem as a unit, so that when long lines drawn in the pixels pass through a lot of existing pixels, the pixels can be refreshed in an intersecting manner, the refreshing of the lines drawn in real time can be directly influenced, an operator visually feels that the lines are stuck, and the broken lines are serious.
The embodiment of the invention uses a double-buffer mechanism, so that the establishment of new items is avoided all the time in the drawing process to reduce a large amount of refreshment generated when the items are contacted, in the drawing process, the scheme uses vector drawing instead of vector drawing for establishing the items, and only when the items are finally stored, the vector drawing is established, so that the number of the items is greatly reduced, and the delay caused by the refreshment in the drawing process is reduced, and the specific method can refer to the following steps:
canvas graphics is used as a parent item, temp (buffer graphics) is added as a child item, and the temp and canvas graphics are both drawn by using a QPair class, and the difference is that: the objects executed last paint in temp layer are: among other functions, the qpair is used to draw a path to a vector graph, and in canvas, the path is drawn as an object to the parent item, resulting in a vector graph. Non-vector drawing is carried out on the temporary layer, the drawing speed is very high at this time, finally, the complete path is drawn into a vector diagram in the release event, and then the temporary layer is drawn out.
To sum up, the embodiment of the present invention adopts a double buffering concept, the concept of double buffering in qgraphics view is similar to the concept of using a qpage in QWidget, but the buffer area cannot be independent of a final rendering interface in conventional use, because the principle that an item needs to be added to a scene to be displayed makes the display of a temp layer dependent on the item and meets the foundation that the item is not independent, therefore, the temp layer needs to be added to a final display layer as a child item to implement double buffering, the temp layer does not need to handle scaling, only needs to use the qpage to complete rendering on a QImage class and then uses a drawImage function to add a vector graphics to a parent item to be displayed, and finally, at the moment of releasing a mouse or touch, the graphics item is rendered on the parent item in a page function manner.
It should be noted that, qgraphics view is a page class in the qt library and is used to display content in qgraphics scene, a qpainer is a stroke class to implement drawing, a QWidget is a window class to display content, usually a vector diagram, item refers to a qgraphics class added in qgraphics scene, that is, each drawn primitive, temp is a buffer layer in a double-buffer mechanism, that is, content before the mouse is released is drawn in the buffer layer in the form of a vector diagram.
Compared with the prior art, the classification drawing method based on Qt provided by the embodiment of the invention has the advantages that the primitive information of the line is obtained according to the position of the selected picture in a way of comparing the line in segments, the primitive range of the picture is compared with the position of each line segment when the picture is selected, only the effective line segment in the primitive range is processed, and the subsequent instruction is executed without selecting the irrelevant line segment. In response to an external movement event, the line segments that will satisfy the common movement move the same as the picture. When a drawing event is responded, the vector drawing is carried out by using the brush module in the buffer primitive, the repeated refreshing of the primitive is avoided, and the vector drawing is only used for displaying in the drawing line, so that the refreshing of the intersected primitive cannot be caused before the vector drawing of the canvas primitive is carried out finally.
In addition, through reasonable classification of external events, touch events and mouse events can be processed respectively after classification, and delay caused by event conversion is eliminated.
An embodiment of the application provides a classification drawing device based on Qt, which comprises a segmentation module, a removal module, a classification module and a processing module.
And the segmentation module is used for segmenting each line on the selected picture according to a preset segmentation distance to obtain a plurality of lines.
And the selection module is used for acquiring the position information of the selected picture and the position information of each line segment and keeping the selected state of the line segment in the range of the graphic element to which the selected picture belongs.
And the classification module is used for acquiring external event information from the interaction information and triggering and classifying the external events according to the external event information.
And the processing module is used for calling a function of corresponding classification according to the trigger classification result to perform event processing on the external event.
Illustratively, the classification module is specifically configured to:
and classifying the external event into a mouse event or a touch event according to the triggering condition of the external event.
Exemplarily, a reading module is further included; the reading module is used for reading the event type and the release event of the external event information; the event types include drawing events and movement events.
Illustratively, the mobile processing subunit in the processing module is to:
and if the external event is a moving event, moving the picture elements and the line segment elements in the primitive range to which the selected picture belongs together, and stopping the event processing when a release event occurs.
Illustratively, the graphics processing subunit in the processing module is to:
if the external event is a drawing event, creating a canvas primitive and a cache primitive and taking the cache primitive as a sub-primitive of the canvas primitive;
converting the drawing path into vector drawing on the cache primitive by using a brush module according to the drawing path in the external event;
when a release event occurs, the vector drawing is converted to a vector drawing on the canvas primitive using a brush module.
It is clear to those skilled in the art that for the convenience and brevity of description, the specific working procedures of the above-described apparatus may refer to the corresponding procedures in the foregoing method embodiments, which are not reiterated herein.
Compared with the prior art, the classification drawing device based on Qt provided by the embodiment of the invention has the advantages that the line is compared in a segmented mode, the information of the pixel to which the line belongs is obtained according to the position when the picture is selected, the pixel range of the picture is compared with the positions of all the line segments, only the effective line segments in the pixel range are processed, and the subsequent instructions are executed if the irrelevant line segments are not selected. In response to an external movement event, the line segments that will satisfy the common movement move the same as the picture. When a drawing event is responded, the vector drawing is carried out by using the brush module in the buffer primitive, the repeated refreshing of the primitive is avoided, and the vector drawing is only used for displaying in the drawing line, so that the refreshing of the intersected primitive cannot be caused before the vector drawing of the canvas primitive is carried out finally.
In addition, through reasonable classification of external events, touch events and mouse events can be processed respectively after classification, and delay caused by event conversion is eliminated.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A Qt-based classification drawing method is characterized by comprising the following steps:
segmenting each line on the selected picture according to a preset segmentation distance to obtain a plurality of lines;
acquiring position information of the selected picture and position information of each line segment, and keeping a selected state for the line segment in the range of the graphic element to which the selected picture belongs;
acquiring external event information from the interactive information, and triggering and classifying the external events according to the external event information;
and calling a function of corresponding classification according to the trigger classification result to perform event processing on the external event.
2. The Qt-based classification drawing method according to claim 1, wherein the triggering classification of the external event according to the external event information specifically includes:
and classifying the external event into a mouse event or a touch event according to the triggering condition of the external event.
3. The Qt-based classification drawing method according to claim 1, wherein after obtaining the external event information from the interaction information and performing the trigger classification of the external event according to the external event information, the method further comprises:
reading the event type and the release event of the external event information; the event types include drawing events and movement events.
4. The Qt-based classification drawing method according to claim 3, wherein the invoking of the function of the corresponding classification according to the trigger classification result to perform the event processing on the external event specifically includes:
and if the external event is a moving event, moving the picture elements and the line segment elements in the primitive range to which the selected picture belongs together, and stopping the event processing when a release event occurs.
5. The Qt-based classification drawing method according to claim 3, wherein the invoking of the function of the corresponding classification according to the trigger classification result to perform the event processing on the external event specifically includes:
if the external event is a drawing event, creating a canvas primitive and a cache primitive and taking the cache primitive as a sub-primitive of the canvas primitive;
converting the drawing path into vector drawing on the cache primitive by using a brush module according to the drawing path in the external event;
when a release event occurs, the vector drawing is converted to vector drawing on the canvas primitive using a brush module.
6. A Qt-based classification plotting apparatus comprising:
the segmentation module is used for segmenting each line on the selected picture according to a preset segmentation distance to obtain a plurality of lines;
the selection module is used for acquiring the position information of the selected picture and the position information of each line segment and keeping the selected state of the line segment in the range of the graphic element to which the selected picture belongs;
the classification module is used for acquiring external event information from the interaction information and triggering and classifying the external events according to the external event information;
and the processing module is used for calling the function of the corresponding classification according to the trigger classification result to perform event processing on the external event.
7. The Qt-based classification-mapping apparatus of claim 6, wherein the classification module is specifically configured to:
and classifying the external event into a mouse event or a touch event according to the trigger condition of the external event.
8. The Qt-based classification plotter of claim 6, further comprising a reading module; the reading module is used for reading the event type and the release event of the external event information; the event types include drawing events and movement events.
9. The Qt-based classification rendering apparatus of claim 8, wherein the movement processing subunit in the processing module is configured to:
and if the external event is a moving event, moving the picture elements and the line segment elements in the primitive range to which the selected picture belongs together, and stopping the event processing when a release event occurs.
10. The Qt-based classification rendering apparatus of claim 8, wherein the rendering processing subunit in the processing module is configured to:
if the external event is a drawing event, creating a canvas primitive and a cache primitive and taking the cache primitive as a sub-primitive of the canvas primitive;
converting the drawing path into vector drawing on the cache primitive by using a brush module according to the drawing path in the external event;
when a release event occurs, the vector drawing is converted to a vector drawing on the canvas primitive using a brush module.
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| CN114241509A (en) * | 2022-02-24 | 2022-03-25 | 江西少科智能建造科技有限公司 | Space segmentation method, system, storage medium and equipment based on construction drawing |
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