CN105957132B - Optimization method is drawn comprising the highly complex three-dimensional scenic high-performance for drawing element - Google Patents
Optimization method is drawn comprising the highly complex three-dimensional scenic high-performance for drawing element Download PDFInfo
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Abstract
Optimization method is drawn comprising the highly complex three-dimensional scenic high-performance for drawing element the present invention relates to a kind of.This method comprises: all drawing units in traversal three-dimensional scenic drawing system, collect each drawing unit state relevant to drafting, and enumerate to obtain the state set being made of several states；The state parameter of element in all state sets is arranged and is respectively indicated with two values, is arranged to obtain state encoding according to the drafting state parameter of each drawing unit；Using the state encoding being made of all state parameters as binary gray code, drawing unit is sorted according to Gray code, the identical drawing unit of the value of gray encoding forms list structure；The corresponding drawing unit of Gray code is successively collected, the queue of drawing unit is established；The identical state parameter of all drawing units is set；The drafting of three-dimensional scenic is carried out according to the sequence of drawing unit queue.The drawing order of a variety of drawing units in drawing system can be adjusted in the present invention, improve and draw efficiency.
Description
Technical field
The invention belongs to information technology, computer graphical and technical field of virtual reality, and in particular to it is a kind of towards comprising
The high-performance of the highly complex three-dimensional scenic for drawing element draws optimization method.
Background technique
One complicated reality environment is often made of various drafting situation elements, such as both includes landform, tree
Wood, meadow, road, building, window (transparent), cloud, automobile vehicles (metal material), the water surface (deep water, shallow water), spray
Spring, personage's (bone, Skinned Animation), various three-dimension objects such as aircraft, and include flame, sky atmosphere, rain, snow, mist are dazzled
Light, shade, reflection, the natural phenomenas such as scattering.The drafting designed individually for above-mentioned one of three-dimension object or phenomenon
For unit when being drawn, efficiency may be efficient.One drawing unit refers to by certain drawing data and draws calculation
Method composition, and drafting state, parameter and material parametric texture etc. with some determinations, each rendering algorithm are executed one time and are drawn
The process of tubulation line.
The drafting of any three-dimensional scenic is carried out using OpenGL graphics standard, the implementation procedure of drawing unit will follow
Draw (rendering) assembly line.The implementation procedure of one drawing unit is exactly the api interface first with OpenGL offer to GPU
Drafting state is configured, or sends some special rendering parameters (such as every ginseng in the shader of GLSL to GPU
Number), or the certain materials of setting and parametric texture etc., geometry (vertex) data then are submitted to rendering pipeline, finally by GPU
Execute the process for drawing instruction.In this way by the interface of OpenGL, user is that GPU is provided with corresponding rendering parameter and state,
And GPU is finally made to draw out correct rendering result in such a way that user needs.The code of transmission drawing data has and shape
State setting the identical life cycle of code, but due to the setting of state be in order to realize draw effect provide draw ginseng
Number specifies and draws function, and transmitting drafting is to provide the scene data object drawn to GPU.When carrying out scene drawing,
It usually drafting state having the same but needs to set different vertex data sources to different scenes, and there are same vertices
The scene of data may but need to form different drafting effects.
In the drawing process comprising the highly complex three-dimensional scenic for drawing element, when multiple drawing units are drawn together
When, since the mode respectively drawn is different, there may be conflict on executing the operating process drawn, a such as drawing unit is needed
Certain drafting state is opened, and another drafting needs to close the drafting state.When the conflict occurs repeatedly, hold repeatedly
These mutual conflicting operations of row can expend certain CPU and GPU time.Drawing of completely contradicting can be arranged in different drawing units
State processed, such as be to open using the depth buffered state for carrying out depth test when executing the drawing unit for drawing transparent substance
, depth buffered state forbid write-in；And when carrying out opaque materials volume drawing, the state of depth test is still
It is so to enable, but state depth buffered simultaneously should be positioned to allow for being written.
The highly complex three-dimensional scenic for drawing element be related to when drawing a variety of three-dimension objects and a variety of natural phenomenas and
Its corresponding multiple drawing unit.The realization of each drawing unit follows the video memory managed to GPU and sends data, setting
This process such as GPU operating status, parameter and material and texture.And operate that require to expend CPU and GPU certain each time
Time can especially consume the time of CPU, because operating the physical layer interface that can all call a 3D graphic plotting each time.But
If two neighboring drawing process operation having the same, it will be able to save primary duplicate operation, improve and draw efficiency.
By taking the drawing process of each element in a following graphics system as an example:
1. drafting state, parameter and material 1 are set, rendering model A,
2. drafting state, parameter and material 2 are set, rendering model B,
3. drafting state, parameter and material 1, rendering model C is arranged.
The above process contains three drawing units, and the information such as drafting state, parameter and the material of model A and C are phases
With, but together with model A with draftings of C is not, but interrupted by the drafting of Model B, it causes drafting state, join
Several and material 1 is provided with twice.If it is as follows to adjust its drawing order:
1. drafting state, parameter and material 2 are set, rendering model B,
2. drafting state, parameter and material 1, rendering model A, C is arranged.
The efficiency then drawn in the order described above will be promoted.Therefore drawing unit is drawn in reasonable arrangement scene
System sequence is played an important role to drafting efficiency is improved.But in practical drawing system, the operation of each drawing unit is more
Kind multiplicity, how this arranges the execution sequence of drawing unit that could obtain the pass that optimal performance is entire drawing system design
Key.
Assuming that a drawing unit comprising a series of various operations including mode set command by constituting, it is assumed that i-th
The Executing Cost of operation is fi, then the cost F that the drawing process of drawing unit k is spentkAre as follows:
Assuming that two drawing unit K adjacent in a drawing process among the drawing system for drawing entire scene1
And K2With identical some operations, and these identical operations can be shared by two drawing units (as setting is drawn
State processed, parameter etc.), then can be only carried out when executing the two drawing units one time these identical operate without repetition and hold
Row, to save regular hour cost, it is assumed that the Executing Cost of these operations that can be omitted because repeating is Fk1k2, that
For the drafting process for the N number of drawing unit successively drawn in sequence, the cost total value W that all operations are spent is executed
Are as follows:
By formula (2) it can be seen that for the drafting process of N number of drawing unit, their drawing order how to be arranged to make
?It is maximum to draw efficiency to which W minimum is the key that acquisition is best.
The problem is the np hard problem of travelling salesman, and the purpose for solving the problems, such as this is exactly to reduce drawing system and execute
It draws the time of process, therefore cannot be to spend additional high time overhead to be ranked up as cost to obtain preferable rendering
Ranking results.Ogre system (Open Source 3D Graphics Engine, http://www.ogre3d.org/) and
Irrlicht engine (http://irrlicht.sourceforge.net/) is used to be made with some parameter in material information
For the foundation of sequence, actually in most cases the parameter be first texture that material has title.It is this with draw
Some data in unit rapid can be obtained with similar material as the algorithm of the greed of the more excellent ordering structure of reference
Scene be put into and draw adjacent position in queue.Its algorithm complexity is identical as the complexity of sort algorithm.Addition rendering row
Sequence module renders the management operation that sorting module itself executes each drawing unit exactly in order to improve drafting efficiency simultaneously
It will increase the time of CPU, had to efficiently so rendering sorting module itself executes operation.
Summary of the invention
Core of the invention thought is exactly to pass through one drafting (rendering) sorting module (method) of addition to answer a height
The drawing order of a variety of drawing units in miscellaneous drawing system is adjusted, by the state of drafting, rendering parameter and material etc.
Identical drawing unit puts together drafting, and some drafting operations identical so only execute one time.Simultaneously by state,
The lesser drawing unit sequence of the parameter value variations such as parameter and material is as adjacent drawing unit, to reduce two neighboring
The cost F of state handover operation is carried out between drawing unitk1k2, it is possible to reduce the setting of the state parameter of redundancy and material etc.
Operation, to improve drafting efficiency.
The technical solution adopted by the invention is as follows:
It is a kind of to draw optimization method, including following step towards the high-performance comprising the highly complex three-dimensional scenic for drawing element
It is rapid:
1) all drawing units in three-dimensional scenic drawing system are traversed, each drawing unit shape relevant to drafting is collected
State, and enumerate to obtain the state set being made of several states；The state includes drafting state, rendering parameter and material
The information such as texture, it is unified to be indicated with state parameter；
2) respectively indicate the state parameter setting of element in all state sets with two values (such as some state parameter
Enabling be arranged its parameter value be 1, the disabling of the state is then 0；In another example the setting of some parameter value can be expressed as 1, and
It is unrelated with the parameter, 0 can be expressed as；If can not be examined in the present invention with state, parameter and material that two-value indicates etc.
Within the scope of worry), it is arranged to obtain state encoding according to the drafting state parameter of each drawing unit, each state parameter is corresponding
Bit；
3) using the state encoding being made of all state parameters as binary gray code, by corresponding drawing unit according to
Gray code sequence, the identical drawing unit of the value of gray encoding form list structure；
4) the corresponding drawing unit of Gray code is successively collected, establishes the queue of drawing unit, the queue is by chain sheet form table
Show and stores；
5) the identical state parameter of all drawing units is set, that is, the state parameter occurred in set of not being at state；
6) drafting of three-dimensional scenic is carried out according to the sequence of drawing unit queue.
Further, step 6) carries out the update of drafting state when executing each drawing unit first；Drawing result is
A frame image is generated, jth frame is labeled as；If the drafting shape of the number of drawing unit and each drawing unit in drawing system
State parameter setting does not change, then continues to draw+1 frame of jth, and so circulation executes, until drawing system operation is terminated.
Further, in step 6), if the number of drawing unit changes, following processing is done:
If a > to drawing system is added to a drawing unit kN+1, then first check for and determine whether to introduce new shape
Whether all drafting state parameters of state, the i.e. drawing unit are included in state set:
If a1 > be not introduced into new mode bit, n mode bit before illustrating is completely covered involved by new drawing unit
And state, draw queue do not need to do any change；
A2 > otherwise need to introduce new mode bit then adds (n+1)th binary digit as new mode bit, and energy
Enough conclude: the kN+1The value of (n+1)th mode bit of drawing unit is different from (n+1)th of other N number of drawing units value；
If b > eliminate a drawing unit k, inspection judges whether to need to delete certain shapes from state set I
State, inspection method are compared one by one for the value of mode bit corresponding to the n state to remaining N-1 drawing unit.
Further, in step 6), if the state parameter i of some drawing unit kqCorresponding state changes
Become, then modifies its Gray code, the value of corresponding states position is by 0 → 1 or by 1 → 0；Specific method is: first checking for N number of drafting
Whether the value of the mode bit of unit is all identical, i.e., is all 1 or 0；If identical, state iqIt is deleted from state set I
It removes；And make the operation of following steps: i in the Gray code of all N number of drawing unitsqThe value of corresponding position is set as 0, and will
All numerical digits in this left side uniformly move to right one, and the digit of Gray code, which subtracts 1, becomes n-1.
Beneficial effects of the present invention are as follows:
The present invention proposes a kind of drawing unit optimization sequencing method based on gray code format, the sequence of N number of drawing unit
Complexity is O (N), and the benefit obtained after sequence is drawing drafting state, parameter and material having the same etc. first
Unit processed forms one group and draws together, and the value of state parameter is only needed to be arranged and can once be come into force to the drawing unit group；Its
The difference of the drafting state parameter for the drawing unit that the value of secondary two neighboring state parameter has differences ideally is 1
(work as N=2nWhen -1, n be Gray code digit, and each drawing unit state encoding it is just different from each other when), i.e., each draw
Unit processed only execute every time state parameter setting operation (because other than the state parameter, other state parameters etc.
It is all identical as a upper drawing unit, without resetting).Optimal scheduling algorithm of the invention in this way can greatly save each
The time overhead of drawing unit setting state parameter.It is to have executed a drafting that one frame of the real-time rendering of three-dimensional scenic is corresponding
All drawing units being arranged in order corresponding to task, next frame will repeat these drafting lists being arranged in order
The drawing system circulation of member, i.e. three-dimensional scenic executes the task of drawing unit.Since Gray code is a kind of coding of cycle format,
Therefore another advantage of this method is exactly drafting state when the drafting state to next frame when a frame end,
Its difference is usually 1, i.e., it is only necessary to by executing a state parameter setting operation for drafting state.So again into one
Step reduces the time cost of drawing system.
Detailed description of the invention
Fig. 1 is the overall flow figure of the method for the present invention.
Fig. 2 is the schematic diagram according to all drawing units of Gray code tissue (by taking four Gray codes as an example).
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below by specific embodiment and
Attached drawing, the present invention will be further described.
Of the invention draws optimization method, bulk flow towards the three-dimensional scenic high-performance for including highly complex drafting element
Journey as shown in Figure 1, specifically includes the following steps:
1. three-dimensional scenic drawing system starts；
2. traversing all N number of drawing unit K={ k1,k2,…kN, collect the state of each drawing unit, the state packet
The information such as drafting state, rendering parameter and material texture are included, state parameter is referred to as, and enumerates to obtain n state and be constituted
State set I={ i1,i2,i3,…in, illustrate other than this n state parameter, remaining drafting state draws ginseng
Number, material texture, all N number of drawing units are all consistent；
3. the state parameter setting of element is respectively indicated by two values in all state sets: opening (enabling), close and (prohibit
With), be separately encoded as 1 and 0, as long as other state parameters be arranged its value can be indicated with two different values can also (such as
The mode for drawing polygon is divided into two kinds of wire frame mode and fill pattern)；The drafting of each drawing unit k is calculated according to the condition
State parameter setting, obtains state encoding, each state corresponds to bit；
4. regarding the coding as binary gray code, corresponding drawing unit is sorted according to Gray code, gray encoding
The identical drawing unit of value form list structure；If two drawing units A and B correspond to duplicate Gray code, two
The sequencing of a drawing unit is unimportant.The step is implemented as follows (as shown in Figure 2):
4.1 establish the array that array element number is N；
The 4.2 each drawing unit k of traversal, obtain its Gray code Gk, and be natural code A by Gray code conversionk；After can refer to
The table of comparisons of four Gray codes and natural code of literary table 1；
If the A of 4.3 arrayskValue in a element is sky, then the pointer of drawing unit k is put into the A of arraykIt is a
Value in element, as the array element；
If the A of 4.4 arrayskValue in a element is not sky, then the end of the chained list according to pointed by the array element
Tail traverses, and the pointer of drawing unit k is put into the end of the chained list.
5. successively collecting the corresponding drawing unit of Gray code since first element of array, establishing final high efficiency
Drawing unit queue Q, queue Q indicates and stored by chain sheet form；
6. value (the state ginseng occurred in set of not being at state I of the identical state parameter of all drawing units is arranged
Number, for all drawing units, these state parameters are all the same)；
It is drawn 7. then drawing system is successively executed according to the sequence of drawing unit queue Q, is executing each drafting
When the rendering algorithm of unit, the update (often only one switching for drawing state) of drafting state is carried out first；Drawing result
To generate a frame image, it is labeled as jth frame；
8. if the setting of the drafting state parameter of the number of drawing unit and each drawing unit is not sent out in drawing system
It is raw to change, then it will continue to draw+1 frame of jth (the beginning state of+1 frame of jth compared with the end state of jth frame, due to+1 frame of jth
The 1st drawing unit to differ position with the value of the drafting state parameter of the n-th drawing unit of jth frame be only 1 (ideal shape
Under state), i.e., the difference of state only only has one, then it is only necessary to update a kind of state to can be carried out correctly depicting),
Circulation executes step 7；
9. if the number of drawing unit changes:
If 9.1 are added to a drawing unit k to drawing systemN+1, then first check for and determine whether to introduce new shape
Whether all drafting state parameters of state, the i.e. drawing unit are included in state set I (containing representated by n set element
State parameter).
9.1.1 if being not introduced into new mode bit, n mode bit before illustrating completely covers new drawing unit institute
The state parameter being related to draws queue Q and does not need to do any change；
9.1.2 otherwise needing to add the state parameter as element, (set element number is changed to n+ into state set I
1), while new mode bit is introduced, then adds (n+1)th binary digit as new mode bit, and may conclude that the kN+1
The value of (n+1)th mode bit of drawing unit is different from (n+1)th of other N number of drawing units value.Because if other N number of
For (n+1)th of drawing unit if there is difference, that should just have n+1 mode bit originally to indicate that this N number of drafting is single
Member thus generates contradiction.Such as: if drawing unit kN+1The (n+1)th status bit value be 0, i.e. disabled status, then other N
The value one of this of a drawing unit is set to 1；
If 1) drawing unit kN+1The (n+1)th status bit value be 0, then the bits of coded is placed in its gray encoding
Highest order, i.e. 0****** (* represents the value of original other bits of coded, and the number of * is n), and by other N number of drawing units
Gray code position extreme higher position be 1；It only needs drawing unit k simultaneouslyN+1The head of queue Q is drawn in insertion, i.e., as the
One unit is drawn.Because according to Gray code principle, the coding of other N number of drawing units both greater than current this is drawn single
First kN+1Coding, while the drafting sequencing of this N number of drawing unit remains unchanged；
If 2) drawing unit kN+1The (n+1)th status bit value be 1, then the coding is placed in the highest of Gray code
Position, i.e. 1***** (* represents the value of other bits of coded, and the number of * is n), and by the Gray code position of other N number of drawing units
Extreme higher position be 0.Simultaneously by drawing unit kN+1The tail portion of queue Q is drawn in insertion, i.e., is drawn as the last one unit
System.Because according to Gray code principle, both less than current this drawing unit k of the coding of other N number of drawing unitsN+1Coding, together
When this N number of drawing unit drafting sequencing remain unchanged；
9.1.3 return step 6；
If some drawing unit k is removed in 9.2 drawing systems, first check for judging whether to need from state set
It closes and deletes certain state parameters in I, inspection method is state corresponding to the n state parameter to remaining N-1 drawing unit
The value of position is compared (need to carry out n times) one by one；
9.2.1 if there is some state parameter ipAnd its corresponding gray state position, N-1 drawing unit should
The value of mode bit is all identical (be all 1 or be all 0, actual implementation can be calculated by bit arithmetic), then the state parameter
ipIt can be deleted from state set I；And make the operation of following steps:
1) i in the Gray code of all N-1 drawing unitspCorresponding position is set as 0, and by all numbers in this left side
The primary system one of position moves to right one, and the digit of Gray code, which subtracts one, becomes n-1；
2) corresponding drawing unit is deleted from queue Q, can be realized by chained list node deletion, other drawing units
Sequence without making any adjustments, this is also the very big advantage of Gray code；
9.2.2 9.2.1 is continued to execute, is finished until all n state parameters all check；
9.2.3 the state parameter deleted if there is no needs, then directly find position of the drawing unit k in Q queue,
And it is deleted from list structure.
9.2.4 return step 6；
10. if the state parameter i of some drawing unit kqCorresponding state changes, then modifies its Gray
Code, the value of corresponding states position is by 0 → 1 or by 1 → 0；
Whether 10.1 values for first checking for the mode bit of N number of drawing unit all identical (be all 1 or 0, can pass through
Bit arithmetic calculates)；
If 10.2 is identical, state iqIt can be deleted from state set I；And make the operation of following steps: institute
There is i in the Gray code of N number of drawing unitqCorresponding position is set as 0, and all numerical digits in this left side are uniformly moved to right one,
The digit of Gray code, which subtracts one, becomes n-1；Return step 6；
10.3 regardless of whether identical, and the sequence of drawing unit is all not necessarily to make any adjustments, this is also the very big of Gray code
The advantages of (because Gray code ensures the variation of only one binary digit between two neighboring coding, current drawing unit state
Encode Gk→Gk' change only occur in a binary digit, then the coding G after the modification of current drawing unitk' or
Equal to Gk- 1 or be equal to Gk+1)；
10.4 if different direct return step 7；
11. drawing system terminates.
The realization details of embodiment is further illustrated below.
The standard program API OpenGL of 3D figure uses a kind of state machine mechanism.Can be set it various states (or
Mode), then allow these states to come into force always, until modifying their value again.Such as current color is exactly that a state becomes
It measures (being equivalent to the state parameter in above content), current color can be set as white, red or other any colors,
The all objects drawn after this will all use this color, until current color is set as other colors again.Current face
Color is one of many state variables that OpenGL is safeguarded.Other state variables have respective use there are also very much
On the way, such as active view and projective transformation, straight line and polygon stipple pattern, polygon Graphics Mode, pixel packaging are controlled about
The fixed, position of illumination and feature and the material properties of drawn object etc..The state variable of many intermediate schemes can be used
GlEnable () and glDisable () function are enabled and are disabled.
If using programmable tinter, according to the difference of OpenGL version used, shape that tinter can identify
The quantity of state is also different.Each state variable (or mode) or parameter have a default value.At any time may be used
With to the current value of each state variable of system queries.Under normal circumstances, one of this following 6 functions can be used to complete this
A task: glGetBooleanv (), glGetDoublev (), glGetIntegerv (), glGetfloatv (),
GlGetPointerv () or glIsEnabled ().The function of specific choice depends on the data type of the result wished to return to.
Some state variables there are also more specific query function (such as glGetLight* (), glGetError () or
GlGetPolygonStipple () etc.).Furthermore it is also possible to use glPushAttrib (), glPushClientAttrib ()
Function is saved in the set of state variable in one attribute stack, they are carried out with interim modification, is used again later
GlPopAttrirb () or glPopClientAttrib () restore these values.If necessary to temporarily be repaired to state variable
Change, should just use these functions, rather than use any query function, because the former is more efficient.
After being called every time to the code of OpenGL state setting, if run without the code of other states setting, that
It can come into force always with regard to its effect, not have to each frame and all repeat to call.
1. 4 Gray codes of table and the natural code table of comparisons
The above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited, the ordinary skill of this field
Personnel can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the spirit and scope of the present invention, this
The protection scope of invention should be subject to described in claims.
Claims (7)
1. a kind of draw optimization method towards the high-performance comprising the highly complex three-dimensional scenic for drawing element, which is characterized in that
The following steps are included:
1) all drawing units in three-dimensional scenic drawing system are traversed, each drawing unit state relevant to drafting is collected, and
It enumerates to obtain the state set being made of several states；
2) state parameter of element in all state sets is arranged and is respectively indicated with two values, according to drawing for each drawing unit
State parameter processed is arranged to obtain state encoding, each state parameter corresponds to bit；
3) using the state encoding being made of all state parameters as binary gray code, by corresponding drawing unit according to Gray
Code sequence, the identical drawing unit of the value of gray encoding form list structure；
4) successively collect the corresponding drawing unit of Gray code, establish the queue of drawing unit, the queue indicated by chain sheet form and
Storage；
5) the identical state parameter of all drawing units is set, that is, the state parameter occurred in set of not being at state；
6) drafting of three-dimensional scenic is carried out according to the sequence of drawing unit queue.
2. the method as described in claim 1, which is characterized in that step 6) is drawn first when executing each drawing unit
The update of state processed；Drawing result is to generate a frame image, is labeled as jth frame；If the number of drawing unit in drawing system
And the drafting state parameter setting of each drawing unit does not change, then continues to draw+1 frame of jth, so circulation executes,
Until drawing system operation is terminated.
3. method according to claim 1 or 2, which is characterized in that the concrete methods of realizing of step 3) is as follows:
A) array that array element number is N is established；
B) each drawing unit k is traversed, its Gray code G is obtainedk, and be natural code A by Gray code conversionk；
If c) the A of arraykValue in a element is sky, then the pointer of drawing unit k is put into the A of arraykA element
In, the value as the array element；
If d) the A of arraykValue in a element is not sky, then the end traversal of the chained list according to pointed by the array element,
And the pointer of drawing unit k is put into the end of the chained list.
4. method according to claim 2, which is characterized in that in step 6), if the number of drawing unit changes,
Do following processing:
If a > to drawing system is added to a drawing unit kN+1, then first check for and determine whether to introduce new state, i.e.,
Whether all drafting state parameters of the drawing unit are included in state set:
If a1 > be not introduced into new mode bit, n mode bit before illustrating is completely covered involved in new drawing unit
State draws queue Q and does not need to do any change；
A2 > otherwise need to introduce new mode bit then adds (n+1)th binary digit as new mode bit, and can break
It is fixed: the kN+1The value of (n+1)th mode bit of drawing unit is different from (n+1)th of other N number of drawing units value；
If b > eliminate a drawing unit k, inspection judges whether to need to delete certain states from state set I, examine
Checking method is compared one by one for the value of mode bit corresponding to the n state to remaining N-1 drawing unit.
5. method as claimed in claim 4, which is characterized in that step a2 > in:
If drawing unit kN+1The (n+1)th status bit value be 0, then the mode bit is placed in the highest order of its gray encoding,
And by the extreme higher position of the Gray code position of other N number of drawing units be 1；Simultaneously by drawing unit kN+1Insertion draws queue Q's
Head is drawn as first unit；
If drawing unit kN+1The (n+1)th status bit value be 1, then the mode bit is placed in the highest order of Gray code, and will
The extreme higher position of the Gray code position of other N number of drawing units is 0；Simultaneously by drawing unit kN+1The tail of queue Q is drawn in insertion
Portion is drawn as the last one unit.
6. method as claimed in claim 4, which is characterized in that step b > include following sub-step:
B1 > if there is some state parameter ipAnd its corresponding gray state position, in the shape of N-1 drawing unit
The value of state position is all identical, then state parameter ipIt is deleted from state set I；And make the operation of following steps:
1 > i in the Gray code of all N-1 drawing unitspCorresponding position is set as 0, and by all numerical digits in this left side
Primary system one moves to right one, and the digit of Gray code, which subtracts one, becomes n-1；
2 > delete corresponding drawing unit from queue Q, the sequence of other drawing units is without making any adjustments；
B2 > continue to execute b1 >, until all inspections finish all n state parameters；
B3 > if there is no the state parameter deleted of needs, then directly find position of the drawing unit k in Q queue, and by its
It is deleted from list structure.
7. the method as described in any one of claim 4 to 6, which is characterized in that in step 6), if some drawing unit
The state parameter i of kqCorresponding state changes, then modifies its Gray code, the value of corresponding states position by 0 → 1 or by
1→0；Specific method is: whether the value for first checking for the mode bit of N number of drawing unit is all identical, i.e., is all 1 or 0；If
It is identical, then state iqIt is deleted from state set I；And make the operation of following steps: the Gray code of all N number of drawing units
Middle iqThe value of corresponding position is set as 0, and all numerical digits in this left side are uniformly moved to right one, change that the digit of Gray code subtracts 1
For n-1.
Priority Applications (1)
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