CN107728841B - Multi-point touch method and system based on bid-winning kylin operating system - Google Patents
Multi-point touch method and system based on bid-winning kylin operating system Download PDFInfo
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
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- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
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Abstract
The invention discloses a multi-point touch method and a multi-point touch system based on a winning bid kylin operating system, wherein a multi-point touch driving module is firstly programmed in an inner core of the winning bid kylin operating system and used for receiving original data of a touch screen and generating an event queue file according to the original data; then integrating an event queue file analysis module and a multipoint event analysis transmission module in an inner core code in a Qt application platform graphic user interface module, wherein the event queue file analysis module and the multipoint event analysis transmission module are used for completing analysis of event queue file data on an operating system user layer and completing judgment and upward transmission functions of multipoint events on the operating system user layer; therefore, an application developer does not need to care about the change of a bottom development platform and a driving layer, only needs to directly develop the multi-touch related user graphical interface of Qt, realizes the multi-touch function under the winning bid kylin operating system, reduces the development difficulty of the multi-touch application program, and improves the portability of the multi-touch application program.
Description
Technical Field
The invention relates to a multi-point touch screen application development technology, in particular to a multi-point touch method based on a winning kylin operating system.
Background
The multi-point touch control is a brand-new man-machine interaction means, allows a computer user to control the computer through a plurality of fingers or touch points at the same time, and provides a natural and convenient mode for the user to directly interact with information contents. Various multi-touch input devices (capacitive touch screens, resistive touch screens, infrared touch screens, optical touch screens, etc.) have appeared on the market at present; some new versions of operating systems, such as the iOS system of apple, Windows 8 of microsoft, and the Android operating system of google, provide support for multi-touch functionality and provide multi-touch APIs to application developers.
However, under the kylin operating system, the multi-touch function cannot be realized at present. The main reasons are as follows: firstly, in an inner core of a winning-bid kylin operating system, an input subsystem module has a multi-point touch event type, but because the inner core does not integrate universal drive aiming at multi-point touch equipment, the system cannot be used for the multi-point touch equipment in an initial state; secondly, the graphic operating environment of the winning bid kylin operating system does not support the multi-touch function, so even if the touch equipment is successfully driven to generate a multi-touch event queue file, the window system cannot provide the multi-touch operation; third, currently, there is an application development environment across operating system platforms, such as QT, which cannot analyze multi-touch event queue files, and therefore cannot transmit multi-touch event information to an upper layer, so that an application program including multi-touch cannot receive related event information on a winning kylin platform to implement a multi-touch function. For the reasons, the computer platform of the winning kylin operating system cannot realize the window operation of multi-point touch, and greatly limits the development of localization of the computing technology.
In the patent "a computer device capable of recognizing a touch event and a recognition method thereof (patent application No. 201010606623.5)" filed by patrioter electronics technology (tianjin) limited, there is proposed a computer device capable of recognizing a touch event, the device including a processing unit, a display unit, a memory module and a touch panel. The method mainly relates to the design of a touch hardware system structure, does not relate to multi-touch device driver adaptation, and does not relate to multi-touch API applied to an upper layer. The patent "a driving method of an infrared multi-touch screen" (patent application No. 201210179460.6) proposes a design scheme of an infrared multi-touch screen device, mainly focuses on the structural design principle and the touch point positioning algorithm of the infrared multi-touch screen device, and does not relate to the driving development and the multi-touch API encapsulation of application-oriented multi-touch devices.
In summary, there is a need to provide a method for supporting multi-touch function under the kylin operating system and providing multi-touch API to application developer by comprehensive utilization of the above resources.
Disclosure of Invention
In view of the above, there is a need for a multi-touch method and system based on the winning kylin operating system, which can reduce the difficulty in developing multi-touch applications and improve the portability of multi-touch applications.
The invention provides a multi-point touch method based on a bid-winning kylin operating system, which comprises the following steps:
s1, programming a multi-point touch drive module in the kernel of the winning-bid kylin operating system, and receiving the original data of the touch screen and generating an event queue file according to the original data;
s2, integrating an event queue file analysis module in an inner core code in a Qt application platform graphic user interface module, and completing analysis of event queue file data in an operating system user layer;
and S3, integrating a multipoint event analysis and transmission module in the inner core code in the Qt application platform graphic user interface module, and finishing the judgment of the multipoint event and the upward transmission function in the operating system user layer.
A multi-point touch system based on a winning bid kylin operating system comprises a multi-point touch driving module, an event queue file analysis module and a multi-point event analysis and transmission module;
the multi-point touch control driving module is programmed into an inner core of a winning kylin operating system and used for receiving original data of a touch screen and generating an event queue file according to the original data;
the event queue file analysis module is integrated in an inner core code in a Qt application platform graphic user interface module and is used for completing analysis of event queue file data in an operating system user layer;
the multipoint event analyzing and transmitting module is integrated in an inner core code in a Qt application platform graphic user interface module and is used for finishing the judging and upward transmitting functions of the multipoint events in an operating system user layer.
The multi-point touch method and the system based on the winning kylin operating system can enable an application developer to directly develop the winning kylin operating system by only using a multi-point touch related user graphic interface of Qt without paying attention to the change of a bottom development platform and a driving layer, realize the multi-point touch function under the winning kylin operating system, simultaneously reduce the development difficulty of the multi-point touch application program and improve the portability of the multi-point touch application program.
Drawings
FIG. 1 is a schematic diagram of the design of the multi-touch method based on the Kappa operating system of the present invention;
FIG. 2 is a block flow diagram of the multi-touch method based on the KaiOpen operating system of the present invention;
FIG. 3 is a block diagram of a sub-flow of step S1 in FIG. 2;
FIG. 4 is a flowchart illustrating the step S1 according to the present invention;
FIG. 5 is a block diagram of a sub-flow of step S2 in FIG. 2;
FIG. 6 is a flowchart illustrating the step S2 according to the present invention;
FIG. 7 is a block diagram of a sub-flow of step S3 in FIG. 2;
FIG. 8 is a flow chart of the steps of the contact state determination algorithm of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments, it being understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
The invention provides a multi-touch method based on a winning kylin operating system, wherein as shown in fig. 1 and 2, the multi-touch method based on the winning kylin operating system comprises the following steps:
and S1, programming a multi-point touch drive module in the kernel of the winning kylin operating system, and receiving the original data of the touch screen and generating an event queue file according to the original data.
As shown in fig. 3 and 4, the step S1 includes the following sub-steps:
s11, completing the registration of the drive module and the related initialization work in the system kernel;
s12, completing equipment discovery and related hooking operation when the multi-point touch equipment is connected with the host;
s13, receiving and caching original data transmitted by the multi-point touch equipment, and realizing data caching in a ping-pong mode or an FIFO mode by adopting a linked list;
and S14, analyzing the original data in the cache, and writing multi-point touch event data into the event queue file, wherein the main event types comprise touch information events and synchronous information events.
Wherein the contact information event mainly comprises:
contact TRACKING identification number ABS _ MT _ TRACKING _ ID
Contact lateral absolute coordinate ABS _ MT _ POSITION _ X
Contact longitudinal absolute coordinate ABS _ MT _ POSITION _ Y
Tool contact area MAJOR axis ABS _ MT _ WIDTH _ MAJOR
Tool contact area stub ABS _ MT _ WIDTH _ MINOR
Contact area MAJOR axis ABS _ MT _ TOUCH _ MAJOR
Contact area stub ABS _ MT _ TOUCH _ MINOR
Contact PRESSURE value ABS _ MT _ PRESSURE
The synchronization information event mainly comprises:
contact information synchronization event SYN _ MT _ REPORT
Contact frame synchronization event SYN _ REPORT
After the source code of the multi-touch driving module is designed in the above manner, the multi-touch driving module needs to be loaded into the system. There are two ways to load the multi-touch driver module: one mode can be directly programmed into the kernel and loaded when the system is started; if no kernel source code of the Kangkolin operating system exists, the Kelvin operating system kernel source code can be compiled to generate a driving module, and then the driving module is loaded in a script or terminal command line mode after the system is started.
And S2, integrating an event queue file analysis module in the inner code in the Qt application platform graphic user interface module, and completing the analysis of the event queue file data in the operating system user layer.
As shown in fig. 5 and 6, the step S2 includes the following sub-steps:
s21, finishing the multi-point event information caching and the initialization of the system related parameters;
s22, traversing the event queue file under the current system, identifying the multi-point touch event queue file, and defining slot association and signals for the identified multi-point touch event queue file;
and S23, when the multi-point touch event queue file has data updating, the slot function is called by the Qt platform to finish the analysis of the multi-point touch data.
Specifically, traversing an event queue file under a current system, and identifying a multi-point touch event queue file; if the multi-point touch event data is found, defining slot association and a signal, wherein a slot function corresponding to the slot association is used for reading and analyzing the multi-point touch event data, and the signal mainly detects whether new data exists in a corresponding event queue file; after the slot association and the signal definition and binding are completed, new data are waited to be analyzed, once the corresponding multi-point touch event queue file has data to be updated, a slot function is automatically called by the Qt platform, the multi-point touch data is analyzed, the analyzed data is put into a buffered data structure, and the multi-point event analysis transmission module is waited to further process.
And S3, integrating a multipoint event analysis and transmission module in the inner core code in the Qt application platform graphic user interface module, and finishing the judgment of the multipoint event and the upward transmission function in the operating system user layer.
As shown in fig. 7, the step S3 includes the following sub-steps:
and S31, resolving the parameters related to the contact point, such as coordinate conversion, conversion from absolute coordinates to pixel coordinates, contact point pressure settlement and the like.
Specifically, the calculation algorithm for the parameters related to the contact point includes a coordinate conversion algorithm, which mainly completes the conversion from the absolute coordinate of the contact point to the pixel coordinate, and the algorithm formula is as follows:
wherein, X and Y are respectively an abscissa value and an ordinate value of a current touch point pixel coordinate, abs _ X and abs _ Y are respectively an abscissa value and an ordinate value of a current physical coordinate, max _ X and min _ X are respectively a maximum value and a minimum value of a touch point physical abscissa, max _ Y and min _ Y are respectively a maximum value and a minimum value of a touch point physical abscissa, and scale _ X and scale _ Y are respectively an abscissa value and an ordinate value of the current touch point pixel coordinate.
The contact related parameter calculation algorithm comprises a contact pressure value algorithm and is mainly used for completing calculation of the contact pressure value. The specific algorithm is as follows: if the underlying hardware provides a contact PRESSURE value, the drive will be passed up through a contact PRESSURE value event (ABS _ MT _ PRESSURE); if the value drive is not provided, then the following algorithm is used to solve:
wherein Pressure is the contact Pressure value, touch _ major is the contact area major axis, width _ major tool contact area major axis.
And S32, finishing the judgment of the contact state, which mainly comprises pressing, standing, moving and leaving.
Specifically, as shown in fig. 8, the step S32 includes the following sub-steps:
s321, initializing a contact buffer queue;
s322, traversing the tracking identification number of the contact in the buffer queue;
s323, when the identification number is not obtained in a traversing manner in the cache queue, adding new contact information into the contact cache queue, setting the contact state as being pressed, and setting a contact information updating identifier;
s324, when the identification number is not obtained in the cache queue in a traversing mode, comparing whether the contact point coordinate is the same as the original coordinate or not, if the contact point coordinate is different from the original coordinate, setting the contact point state as moving, updating coordinate information, and setting a contact point information updating marker; if the contact state is the same as the static state, setting a contact information updating marker;
s325, when the press state is judged or the contact dynamic judgment is finished, receiving a synchronous signal, traversing the tracking identification number of the contact in the buffer queue again if a contact information synchronous event is received, detecting a contact information updating identifier if a contact frame synchronous event is received, and determining the contact state as leaving if an unset contact is found.
And S326, transferring the information such as all current contact coordinates, states and the like to the Qt upper layer, deleting all contacts leaving the states from the contact cache queue, resetting all contact information updating identifiers, and traversing the tracking identification numbers of the contacts in the cache queue again.
And S33, sending the multipoint event information of the current frame to the upper layer application.
According to the multi-point touch method based on the winning bid kylin operating system, the invention also provides a multi-point touch system based on the winning bid kylin operating system, wherein the multi-point touch system based on the winning bid kylin operating system comprises a multi-point touch driving module, an event queue file analysis module and a multi-point event analysis and transmission module;
the multi-point touch control driving module is programmed into an inner core of a winning kylin operating system and used for receiving original data of a touch screen and generating an event queue file according to the original data;
the event queue file analysis module is integrated in an inner core code in a Qt application platform graphic user interface module and is used for completing analysis of event queue file data in an operating system user layer;
the multipoint event analyzing and transmitting module is integrated in an inner core code in a Qt application platform graphic user interface module and is used for finishing the judging and upward transmitting functions of the multipoint events in an operating system user layer.
Specifically, the method for integrating and coding two module codes of the event queue file analysis module and the multipoint event analysis and transmission module into the inner core code in the graphical user interface module of the Qt development platform comprises the following steps: the method comprises the steps of firstly, completing the design of a source code, and integrating program segments for analyzing and transmitting a multi-point touch event analysis and a multi-point event analysis into the source code; secondly, modifying the related Makefile and Qt development platform engineering file, and recompiling a Qt development platform graphic user interface module; and thirdly, installing Qt and finishing updating dynamic link library files, library files and environment variables of related paths of the platform graphical user interface.
The multi-touch driving module comprises the following functional units:
the drive module registration unit is used for completing the registration and related initialization work of the drive module in a system kernel;
the hanging operation unit is used for finishing equipment discovery and related hanging operation when the multi-point touch equipment is connected with the host;
and the data caching unit is used for receiving and caching the original data transmitted by the multi-point touch equipment and realizing data caching in a ping-pong mode or an FIFO mode by adopting a linked list.
And the event queue file generating unit is used for analyzing the original data in the cache and writing the multi-point touch event data into the event queue file.
The event queue file analysis module comprises the following functional units:
the initialization unit is used for finishing the caching of multipoint event information and the initialization of system related parameters;
the multi-point identification unit is used for traversing the event queue file under the current system, identifying the multi-point touch event queue file, and defining slot association and signals for the identified multi-point touch event queue file;
and the data analysis unit is used for calling the slot function by the Qt platform to finish the analysis of the multi-point touch data when the multi-point touch event queue file has data updating.
The multipoint event analysis and transmission module comprises the following functional units:
the parameter calculating unit is used for calculating the relevant parameters of the contact;
the state judgment unit is used for finishing the judgment of the contact state;
and the data transmission unit is used for sending the multipoint event information of the current frame to the upper layer application.
Specifically, the state judgment unit includes the following functional sub-units:
the queue initialization subunit is used for initializing a contact buffer queue;
the traversal contact subunit is used for traversing the tracking identification number of the contact in the cache queue;
the pressing state judging subunit is used for adding new contact information into the contact cache queue when the identification number is not obtained in a traversal mode in the cache queue, setting the contact state as pressing, and setting a contact information updating identifier;
the contact dynamic judgment subunit is used for comparing whether the contact coordinate is the same as the original coordinate or not when the identification number is not obtained in a traversal mode in the cache queue, and if the contact coordinate is different from the original coordinate, setting the contact state as moving, updating coordinate information and setting a contact information updating identifier; if the contact state is the same as the static state, setting a contact information updating marker;
and the departure state judgment subunit is used for receiving the synchronization signal when judging that the pressing state is judged or after the contact dynamic judgment is finished, traversing the tracking identification number of the contact in the cache queue again if receiving the contact information synchronization event, detecting the contact information updating identifier if receiving the contact frame synchronization event, and determining the contact state as departure if finding an unset contact.
The multi-point touch method and the system based on the winning kylin operating system can enable an application developer to directly develop the winning kylin operating system by only using a multi-point touch related user graphic interface of Qt without paying attention to the change of a bottom development platform and a driving layer, realize the multi-point touch function under the winning kylin operating system, simultaneously reduce the development difficulty of the multi-point touch application program and improve the portability of the multi-point touch application program.
The above apparatus embodiments and method embodiments are in one-to-one correspondence, and reference may be made to the method embodiments for a brief point of the apparatus embodiments.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in random access memory, read only memory, electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A multi-point touch method based on a bid-winning kylin operating system is characterized by comprising the following steps:
s1, programming a multi-point touch drive module in the kernel of the winning-bid kylin operating system, and receiving the original data of the touch screen and generating an event queue file according to the original data; step S1 includes the following substeps:
s11, completing the registration of the drive module and the related initialization work in the system kernel;
s12, completing equipment discovery and related hooking operation when the multi-point touch equipment is connected with the host;
s13, receiving and caching original data transmitted by the multi-point touch equipment, and realizing data caching in a ping-pong mode or an FIFO mode by adopting a linked list;
s14, analyzing the original data in the cache, and writing multi-point touch event data into the event queue file, wherein the main event types comprise contact information events and synchronous information events;
wherein the contact information event mainly comprises: the contact tracking identification number, the transverse absolute coordinate of the contact, the longitudinal absolute coordinate of the contact, the long axis of a contact area of a tool contact, the short axis of the contact area of the tool contact, the long axis of the contact area of the contact, the short axis of the contact area of the contact and the pressure value of the contact; the synchronization information event mainly comprises: a contact information synchronization event, a contact frame synchronization event;
s2, integrating an event queue file analysis module in an inner core code in a Qt application platform graphic user interface module, and completing analysis of event queue file data in an operating system user layer;
s3, integrating a multipoint event analysis and transmission module in an inner core code in a Qt application platform graphic user interface module, and finishing the judgment and upward transmission functions of the multipoint event in an operating system user layer; step S3 includes the following substeps:
s31, resolving the relevant parameters of the contact; the contact related parameter calculation algorithm comprises a coordinate conversion algorithm and mainly completes conversion from contact absolute coordinates to pixel coordinates; the contact related parameter calculation algorithm comprises a contact pressure value algorithm and is mainly used for completing calculation of the contact pressure value;
s32, finishing the judgment of the contact state, specifically comprising:
s321, initializing a contact buffer queue;
s322, traversing the tracking identification number of the contact in the buffer queue;
s323, when the identification number is not obtained in a traversing manner in the cache queue, adding new contact information into the contact cache queue, setting the contact state as being pressed, and setting a contact information updating identifier;
s324, when the identification number is not obtained in the cache queue in a traversing mode, comparing whether the contact point coordinate is the same as the original coordinate or not, if the contact point coordinate is different from the original coordinate, setting the contact point state as moving, updating coordinate information, and setting a contact point information updating marker; if the contact state is the same as the static state, setting a contact information updating marker;
s325, when the pressing state is judged or the contact dynamic judgment is completed, receiving a synchronous signal, traversing the tracking identification number of the contact in the cache queue again if a contact information synchronous event is received, detecting a contact information updating identifier if a contact frame synchronous event is received, and determining the contact state as leaving if an unset contact is found;
s326, transferring all current contact coordinates, state and other information to the Qt upper layer, deleting all contacts leaving the state from the contact cache queue, resetting all contact information updating identifiers, and traversing the tracking identification numbers of the contacts in the cache queue again;
and S33, sending the multipoint event information of the current frame to the upper layer application.
2. The multi-touch method based on the winning kylin operating system of claim 1, wherein the step S2 comprises the following sub-steps:
s21, finishing the multi-point event information caching and the initialization of the system related parameters;
s22, traversing the event queue file under the current system, identifying the multi-point touch event queue file, and defining slot association and signals for the identified multi-point touch event queue file;
and S23, when the multi-point touch event queue file has data updating, the slot function is called by the Qt platform to finish the analysis of the multi-point touch data.
3. A multi-point touch system based on a winning bid kylin operating system is characterized in that the multi-point touch system based on the winning bid kylin operating system comprises a multi-point touch driving module, an event queue file analysis module and a multi-point event analysis and transmission module;
the multi-point touch control driving module is programmed into an inner core of a winning kylin operating system and used for receiving original data of a touch screen and generating an event queue file according to the original data; the multi-touch driving module comprises the following functional units:
the drive module registration unit is used for completing the registration and related initialization work of the drive module in a system kernel;
the hanging operation unit is used for finishing equipment discovery and related hanging operation when the multi-point touch equipment is connected with the host;
the data caching unit is used for receiving original data transmitted by the caching multi-point touch equipment and realizing data caching in a ping-pong mode or an FIFO mode by adopting a linked list;
the event queue file generating unit is used for analyzing the original data in the cache and writing multi-point touch event data into the event queue file, wherein the main event types comprise contact information events and synchronous information events;
wherein the contact information event mainly comprises: the contact tracking identification number, the transverse absolute coordinate of the contact, the longitudinal absolute coordinate of the contact, the long axis of a contact area of a tool contact, the short axis of the contact area of the tool contact, the long axis of the contact area of the contact, the short axis of the contact area of the contact and the pressure value of the contact; the synchronization information event mainly comprises: a contact information synchronization event, a contact frame synchronization event;
the event queue file analysis module is integrated in an inner core code in a Qt application platform graphic user interface module and is used for completing analysis of event queue file data in an operating system user layer;
the multipoint event analyzing and transmitting module is integrated in an inner core code in a Qt application platform graphic user interface module and is used for finishing the judging and upward transmitting functions of the multipoint events in an operating system user layer;
the multipoint event analysis and transmission module comprises the following functional units:
the parameter calculating unit is used for calculating the relevant parameters of the contact;
the state judgment unit is used for finishing the judgment of the contact state;
a data transmission unit for transmitting the multipoint event information of the current frame to the upper layer application;
the state judgment unit comprises the following functional subunits:
the queue initialization subunit is used for initializing a contact buffer queue;
the traversal contact subunit is used for traversing the tracking identification number of the contact in the cache queue;
the pressing state judging subunit is used for adding new contact information into the contact cache queue when the identification number is not obtained in a traversal mode in the cache queue, setting the contact state as pressing, and setting a contact information updating identifier;
the contact dynamic judgment subunit is used for comparing whether the contact coordinate is the same as the original coordinate or not when the identification number is not obtained in a traversal mode in the cache queue, if the contact coordinate is different from the original coordinate, setting the contact state as moving, updating coordinate information and setting a contact information updating identifier; if the contact state is the same as the static state, setting a contact information updating marker;
and the departure state judgment subunit is used for receiving the synchronization signal when the pressing state judgment is judged or after the contact dynamic judgment is finished, traversing the tracking identification number of the electric shock in the cache queue again if the contact information synchronization event is received, detecting the contact information updating identifier if the contact frame synchronization event is received, and determining the contact state as departure if an unset contact is found.
4. The multi-touch system based on the winning kylin operating system of claim 3, wherein the event queue file parsing module comprises the following functional units:
the initialization unit is used for finishing the caching of multipoint event information and the initialization of system related parameters;
the multi-point identification unit is used for traversing the event queue file under the current system, identifying the multi-point touch event queue file, and defining slot association and signals for the identified multi-point touch event queue file;
and the data analysis unit is used for calling the slot function by the Qt platform to finish the analysis of the multi-point touch data when the multi-point touch event queue file has data updating.
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