CN103049884B - A kind of generation method and apparatus of digital whiteboard thumbnail - Google Patents
A kind of generation method and apparatus of digital whiteboard thumbnail Download PDFInfo
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- CN103049884B CN103049884B CN201210524246.XA CN201210524246A CN103049884B CN 103049884 B CN103049884 B CN 103049884B CN 201210524246 A CN201210524246 A CN 201210524246A CN 103049884 B CN103049884 B CN 103049884B
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- digital
- thumbnail
- blank
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- white boards
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Abstract
The present invention proposes a kind of generation method of digital whiteboard thumbnail, including step: set up the element copy of Contemporary Digital blank；Obtain the dimension scale of thumbnail and described Contemporary Digital blank；According to described dimension scale by described element copy a little zooming in and out relative to described Contemporary Digital blank；Element copy after scaling is rendered on thumbnail object.The present invention proposes the generating means of a kind of digital whiteboard thumbnail, can improve digital white boards and generate the efficiency of thumbnail.
Description
Technical field
The present invention relates to digital white boards control field, particularly relate to the generation side of a kind of digital whiteboard thumbnail
Method and device.
Background technology
At present digital white boards uses extensively in education sector and meeting room, user can draw on blank or
Add other element, such as: picture；When finding that current whiteboard does not has position to add new element, Yong Huke
To first pass through dragging digital white boards to expand the region of blank；Such as: the size of digital white boards when program starts
For screen size, when user is left to screen for blank or the right dragging, the width of blank starts to become big；
When user drags blank to the upper of screen or lower section, the height of blank also can become big；The most again newly
The whiteboard area increased is added new element.
But when the region of digital white boards is increasing, the time required for generation blank thumbnail also becomes
The longest；Because generating thumbnail widespread practice is first to render one and blank picture of the same size, so
After again element is drawn on the relevant position of this pictures, finally this according to its position on blank one by one
Picture narrows down to required thumbnail dimensions.When blank has a wide height the biggest such as 10000*10000
Time, according to traditional breviary map generalization method, the picture size rendered is also for 10000*10000；Computer
Time for rendering picture with reduce picture also can become the longest accordingly, the when of because wide height is the biggest, and meter
Calculation machine needs the pixel number rendered also can increase accordingly；Because user is actual wide high the biggest
On blank after addition element, thumbnail just Flushing success after needing geometric ratio long period of time, it is impossible to meet
User uses demand in real time.
So, the efficiency how improving generation digital whiteboard thumbnail is the thing that we are badly in need of solving now.
Summary of the invention
It is an object of the invention to propose the generation method and apparatus of a kind of digital whiteboard thumbnail, can improve
Digital white boards generates the efficiency of thumbnail.
The scheme used:
A kind of generation method of digital whiteboard thumbnail, including step:
Set up the element copy of Contemporary Digital blank；
Obtain the dimension scale of thumbnail and described Contemporary Digital blank；
According to described dimension scale by described element copy a little contracting relative to described Contemporary Digital blank
Put；
Element copy after scaling is rendered on thumbnail object.
And, the generating means of a kind of digital whiteboard thumbnail, including:
Unit set up by element copy, for setting up the element copy of Contemporary Digital blank；
Dimension scale acquiring unit, for obtaining the dimension scale of thumbnail and described Contemporary Digital blank；
Unit for scaling, is used for white relative to described Contemporary Digital for described element copy according to described dimension scale
A little zooming in and out of plate；
Rendering unit, for rendering the element copy after scaling at thumbnail object.
In the present invention, first all blank element copies are reduced, required for this process relative to certain point
Time depend on the calculating speed of CPU, the mainly calculating of numerical value is not related to rendering of pixel, so
This calculating process only needs the shortest computer processing time, then renders scaling on thumbnail object
After digital white boards element copy because thumbnail dimensions is typically the least, required for the pixel number that renders also
Can become little accordingly, so rendering Background to have only to the shortest time.Therefore relative to the most universal
Thumbnail generating algorithm, the inventive method needs the pixel number rendered to greatly reduce when generating thumbnail,
So being greatly improved the formation efficiency of thumbnail, the method when needing the thumbnail generating big quantity simultaneously
Effect become apparent from.
Accompanying drawing explanation
Fig. 1 is an embodiment flow chart of the inventive method；
Fig. 2 is a schematic diagram before carrying out digital white boards size renewal in the present invention；
Fig. 3 is to carry out a schematic diagram after dragging digital white boards in the present invention；
Fig. 4 is a schematic diagram after carrying out digital white boards size renewal in the present invention；
Fig. 5 is another schematic diagram after carrying out digital white boards size renewal in the present invention；
Schematic diagram when Fig. 6 is to update digital white boards size in the present invention；
Fig. 7 is to carry out a schematic diagram after dragging digital white boards in the present invention；
Fig. 8 is a schematic diagram after carrying out digital white boards size renewal in the present invention；
Fig. 9 is a structural representation of apparatus of the present invention；
Figure 10 is another structural representation of apparatus of the present invention.
Detailed description of the invention
The present invention proposes a kind of generation method of digital whiteboard thumbnail, one of them embodiment flow chart, as
Fig. 1, including step:
S1, set up the element copy of Contemporary Digital blank；
S2, acquisition thumbnail and the dimension scale of Contemporary Digital blank；
Concrete, dimension scale can be: thumbnail and the width ratio of Contemporary Digital blank, and breviary
Figure and the height ratio of Contemporary Digital blank.
S3, according to dimension scale by element copy a little zooming in and out relative to Contemporary Digital blank；
Concrete, on the width of Contemporary Digital blank, according to width ratio by element copy relative to
A little zooming in and out of Contemporary Digital blank；
In the short transverse of Contemporary Digital blank, according to height ratio by element copy relative to Contemporary Digital
A little zooming in and out of blank.
S4, will scaling after element copy render on thumbnail object.
In the present invention, first all blank element copies are reduced, required for this process relative to certain point
Time depend on the calculating speed of CPU, the mainly calculating of numerical value is not related to rendering of pixel, so
This calculating process only needs the shortest computer processing time, then renders scaling on thumbnail object
After digital white boards element copy because thumbnail dimensions is typically the least, required for the pixel number that renders also
Can become little accordingly, so rendering Background to have only to the shortest time.Therefore relative to the most universal
Thumbnail generating algorithm, the inventive method needs the pixel number rendered to greatly reduce when generating thumbnail,
So being greatly improved the formation efficiency of thumbnail, the method when needing the thumbnail generating big quantity simultaneously
Effect become apparent from.
During using digital white boards, needing more digital white boards space to carry out addition element, this just needs
The size of digital white boards is updated；The digital white boards size update method that the present invention proposes is:
When digital white boards is not completely covered display screen, expand the size of digital white boards to the direction of display screen,
Display screen is completely covered.
As in figure 2 it is shown, when starting, the size of digital white boards and display screen are in the same size wherein, ABCD
Represent display screen area.
Drag digital white boards to the direction, the upper left corner of display screen, digital white boards be dragged to position shown in Fig. 3,
Wherein, A1, B1, C1 and D1 represent 4 summits of digital white boards；A, B, C, D represent display
4 summits of screen；According to the update method of the digital white boards size that the present invention proposes, owing to, in Fig. 3, counting
Word blank is not completely covered display screen, then expand the region of digital white boards to display screen direction, wherein expand
After a schematic diagram refer to Fig. 4, the digital white boards region after expansion is A1B3C3D3, and its region does not limits
In diagram, can infinitely extend in theory.But due to, need to generate the thumbnail of digital white boards, if number
Word blank oversize, thumbnail will be the least, so that invisible；The most actually can't be ad infinitum
Expand the size of digital white boards.
After the size of digital white boards has updated, carry out setting up the step of the element copy of Contemporary Digital blank.
Digital white boards concrete may is that of size update method that the present invention proposes
Obtain the primary importance of digital white boards when starting to drag；
Obtain the second position of digital white boards when terminating to drag；
The side-play amount of digital white boards is obtained according to primary importance and the second position；
Expand the size of digital white boards according to side-play amount to display screen direction, display screen is completely covered.
For convenience of understanding, illustrate below in conjunction with accompanying drawing.
In one embodiment, set up with the summit in the display screen upper left corner as initial point, AB direction be X-axis just
It it is the rectangular coordinate system of Y-axis forward to, CA direction；
Obtain the coordinate of the primary importance of digital white boards when starting to drag, can store it in rectangle variable；
Wherein, it is also possible to the size of digital white boards now is stored in rectangle variable；The concrete shape of rectangle variable
Formula can be that (x, y, w, h), x is the X-axis coordinate of reference point in digital white boards；Y is in digital white boards
The Y-axis coordinate of reference point；W is the width of digital white boards；H is the height of digital white boards.
Select the top left corner apex of digital white boards as this reference point traditionally.When dragging digital white boards for the first time,
Digital white boards is in the same size with display screen, the most now rectangle variable be (0,0, w, h)；
Obtain the coordinate of the second position of digital white boards at the end of dragging；If at the end of Tuo Donging, digital white boards
Position, as it is shown on figure 3, then obtain the coordinate of digital white boards top left corner apex A1, is set to (-10,5), then
Now the rectangle variable of digital white boards be (-10,5, w, h)；
Then, the side-play amount obtaining primary importance and the second position be (-10,5, w, h)；I.e., at X
On direction of principal axis, digital white boards left shift-10；In the Y-axis direction, digital white boards offsets up 5；
The width of digital white boards is expanded to display screen direction 10；By the height of digital white boards to display screen direction
Expand 5.Obtaining the digital white boards region shown in Fig. 5 is: A1B2C2D.
As shown in Figure 6, when dragging digital white boards to the lower section of display screen, according to the digital dash board of the present invention
Size update method, the digital white boards region after being expanded is the ABC1D1 shown in Fig. 6.
Another situation, before dragging digital white boards, the size of digital white boards alreadys more than the big of display screen
Little；And cover all display screen, as shown in Figure 7；At the end of dragging, the position of digital white boards such as Fig. 8
Shown in, still cover all display screen, digital white boards is not carried out the renewal of size.
During dragging digital white boards, the element in digital white boards moves the most together, the side-play amount of movement and number
The side-play amount of word blank is the same, and the purpose of do so is, visually lets the user know that drag operation enters
OK, the position after more new element is dragged on software inhouse.
When carrying out step S4, concrete, the opportunity that thumbnail generates can be that user terminates blank drag operation
Or in digital white boards, the situation such as add after new element.Thumbnail usually generate smaller picture (as
50*50), it will be assumed now that the size of required thumbnail is (w1, h1), w1, h1 are the width of digital white boards
And height；Contemporary Digital blank rectangle variate-value is (x, y, w2, h2).W2, h2 are digital white boards
Width and height；Calculating thumbnail size and the ratio of blank actual size, width ratio d1=w1/w2,
Height ratio d2=h1/h2.Then choosing any point in rectangle variable region (is i.e. in digital white boards
Any point, because rectangle variable represents physical location and the size of Contemporary Digital blank), every on blank
One element sets up a copy, and all elements copy zooms in and out both relative to this point, zoom ratio be (d1,
D2), because blank element is two dimension variable, so needing the scaling of x-axis and y-axis.Finally scaling
Rear element copy renders on thumbnail object.
After digital white boards expands, in display screen, the content of display is only the part in digital white boards.
The present invention proposes the generating means of a kind of digital whiteboard thumbnail, with reference to Fig. 9, including:
Unit set up by element copy, for setting up the element copy of Contemporary Digital blank；
Dimension scale acquiring unit, for obtaining the dimension scale of thumbnail and Contemporary Digital blank；
Unit for scaling, is used for element copy a little carrying out relative to Contemporary Digital blank according to dimension scale
Scaling；
Rendering unit, for rendering the element copy after scaling at thumbnail object.
In the present invention, first all blank element copies are reduced, required for this process relative to certain point
Time depend on the calculating speed of CPU, the mainly calculating of numerical value is not related to rendering of pixel, so
This calculating process only needs the shortest computer processing time, then renders scaling on thumbnail object
After digital white boards element copy because thumbnail dimensions is typically the least, required for the pixel number that renders also
Can become little accordingly, so rendering Background to have only to the shortest time.Therefore relative to the most universal
Thumbnail generating algorithm, the inventive method needs the pixel number rendered to greatly reduce when generating thumbnail,
So being greatly improved the formation efficiency of thumbnail, the method when needing the thumbnail generating big quantity simultaneously
Effect become apparent from.
Wherein, dimension scale includes: the width ratio of thumbnail and Contemporary Digital blank, and thumbnail with
The height ratio of Contemporary Digital blank.
Unit for scaling on the width of Contemporary Digital blank, according to width ratio by element copy relative to
A little zooming in and out of Contemporary Digital blank；In the short transverse of Contemporary Digital blank, according to height ratio
By element copy a little zooming in and out relative to Contemporary Digital blank.
During using digital white boards, needing more digital white boards space to carry out addition element, this just needs
Will be updated the size of digital white boards, the generating means of the digital whiteboard thumbnail that the present invention proposes also is wrapped
Include updating block；With reference to Figure 10,
Wherein, updating block, when digital white boards is not completely covered display screen, expands to the direction of display screen
The size of digital white boards, is completely covered display screen；Then notice element copy is set up unit and is set up current number
The element copy of word blank.
When specifically updating, updating block obtains the primary importance of digital white boards when starting to drag, and obtains knot
The second position of digital white boards when bundle drags；The skew of digital white boards is obtained according to primary importance and the second position
Amount；Expand the size of digital white boards according to side-play amount to display screen direction, display screen is completely covered.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed,
But therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for this area
Those of ordinary skill for, without departing from the inventive concept of the premise, it is also possible to make some deformation and
Improving, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be with appended
Claim is as the criterion.
Claims (10)
1. the generation method of a digital whiteboard thumbnail, it is characterised in that include step:
Set up the element copy of Contemporary Digital blank；
Obtain the dimension scale of thumbnail and described Contemporary Digital blank；
According to described dimension scale by described element copy a little contracting relative to described Contemporary Digital blank
Put；
Element copy after scaling is rendered on thumbnail object.
The generation method of digital whiteboard thumbnail the most according to claim 1, it is characterised in that
Described dimension scale includes: described thumbnail and the width ratio of described Contemporary Digital blank, Yi Jisuo
State the height ratio of thumbnail and described Contemporary Digital blank.
The generation method of digital whiteboard thumbnail the most according to claim 2, it is characterised in that
Described according to dimension scale by described element copy a little contracting relative to described Contemporary Digital blank
The step put includes:
On the width of described Contemporary Digital blank, according to described width ratio by described element copy phase
For a little zooming in and out of described Contemporary Digital blank；
In the short transverse of described Contemporary Digital blank, according to described height ratio by described element copy phase
For a little zooming in and out of described Contemporary Digital blank.
The generation method of digital whiteboard thumbnail the most according to claim 1, it is characterised in that
Include before the step of the described element copy setting up Contemporary Digital blank:
When described digital white boards is not completely covered display screen, expand described number to the direction of described display screen
The size of word blank, is completely covered described display screen.
The generation method of digital whiteboard thumbnail the most according to claim 4, it is characterised in that
The described size expanding described digital white boards to the direction of display screen, is completely covered described display screen
Step includes:
Obtain the primary importance of digital white boards when starting to drag；
Obtain the second position of described digital white boards when terminating to drag；
The side-play amount of described digital white boards is obtained according to described primary importance and the described second position；
The size of described digital white boards is expanded to described display screen direction, by described display according to described side-play amount
Screen is completely covered.
6. the generating means of a digital whiteboard thumbnail, it is characterised in that including:
Unit set up by element copy, for setting up the element copy of Contemporary Digital blank；
Dimension scale acquiring unit, for obtaining the dimension scale of thumbnail and described Contemporary Digital blank；
Unit for scaling, is used for white relative to described Contemporary Digital for described element copy according to described dimension scale
A little zooming in and out of plate；
Rendering unit, for rendering the element copy after scaling at thumbnail object.
The generating means of digital whiteboard thumbnail the most according to claim 6, it is characterised in that
Described dimension scale includes: described thumbnail and the width ratio of described Contemporary Digital blank, Yi Jisuo
State the height ratio of thumbnail and described Contemporary Digital blank.
The generating means of digital whiteboard thumbnail the most according to claim 7, it is characterised in that
Described unit for scaling is on the width of described Contemporary Digital blank, according to described width ratio by institute
State element copy a little zooming in and out relative to described Contemporary Digital blank；At described Contemporary Digital blank
In short transverse, according to described height ratio by described element copy relative to the one of described Contemporary Digital blank
Point zooms in and out.
The generating means of digital whiteboard thumbnail the most according to claim 6, it is characterised in that described
The generating means of digital whiteboard thumbnail also includes updating block；
Wherein, described updating block is not when described digital white boards is completely covered display screen, to described display
The direction of screen expands the size of described digital white boards, is completely covered by described display screen；Then described unit is notified
Element copy is set up unit and is set up the element copy of Contemporary Digital blank.
The generating means of digital whiteboard thumbnail the most according to claim 9, it is characterised in that
Described updating block obtains the primary importance of digital white boards when starting to drag, and when obtaining end dragging
The second position of described digital white boards；Described numeral is obtained white according to described primary importance and the described second position
The side-play amount of plate；Expand the size of described digital white boards to described display screen direction according to described side-play amount, will
Described display screen is completely covered.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210524246.XA CN103049884B (en) | 2012-12-07 | 2012-12-07 | A kind of generation method and apparatus of digital whiteboard thumbnail |
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| CN201210524246.XA CN103049884B (en) | 2012-12-07 | 2012-12-07 | A kind of generation method and apparatus of digital whiteboard thumbnail |
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| CN103049884B true CN103049884B (en) | 2016-08-24 |
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| CN109389659B (en) * | 2018-09-11 | 2023-08-25 | 广州视源电子科技股份有限公司 | Rendering method and device of mathematical formula in PPT, storage medium and terminal equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102591646A (en) * | 2011-12-23 | 2012-07-18 | 广东威创视讯科技股份有限公司 | Method for simultaneously scaling multiple WPF (Windows presentation foundation) windows and device |
| CN102752622A (en) * | 2011-11-16 | 2012-10-24 | 新奥特（北京）视频技术有限公司 | Three-dimensional display method of color spaces |
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| JP4102847B2 (en) * | 2006-06-30 | 2008-06-18 | シャープ株式会社 | Image data providing apparatus, image display apparatus, image display system, image data providing apparatus control method, image display apparatus control method, control program, and recording medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102752622A (en) * | 2011-11-16 | 2012-10-24 | 新奥特（北京）视频技术有限公司 | Three-dimensional display method of color spaces |
| CN102591646A (en) * | 2011-12-23 | 2012-07-18 | 广东威创视讯科技股份有限公司 | Method for simultaneously scaling multiple WPF (Windows presentation foundation) windows and device |
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Address after: 510670 Guangdong Province, Guangzhou high tech Industrial Development Zone Kezhu Road No. 233 Patentee after: VTRON GROUP Co.,Ltd. Address before: 510663 Guangzhou province high tech Industrial Development Zone, Guangdong, Cai road, No. 6, No. Patentee before: VTRON TECHNOLOGIES Ltd. |
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