Abstract:
According to one embodiment, a shooting game control method, which is executed by a computer incorporated in a device including a display and a touch panel, includes accepting a touch operation on the touch panel; displaying a first frame indicative of a shooting effective range on the display in accordance with a position of the touch operation; accepting an instruction for an attack on an attack target in a state in which the first frame is displayed; determining whether the attack target in a game image displayed on the display is within the first frame or not, at a time point when the instruction for the attack has been accepted; and controlling the attack on the attack target in the game image in accordance with a result of the determining.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims the benefit of priority from Japanese Patent Applications No. 2013-035555, filed on Feb. 26, 2013 and No. 2013-131778, filed on Jun. 24, 2013, the entire contents of which are incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a shooting game control method and a game system, which are suited to a device including a touch-panel-type display screen, such as a smartphone. 
     2. Description of the Related Art 
     Conventionally, there has been thought a technique wherein, in order to realize a game with high operability with use of a touch panel, if a touch panel is slid-operated so as to draw a locus surrounding an enemy character on a display screen, the enemy character surrounded by the locus is automatically registered as a lock-on target, and a shooting action aiming at the enemy character of the lock-on target is executed in accordance with a subsequent tap operation (for example, Patent document 1). 
     CITATION LIST 
     Patent Literature 
     
         
         Patent document 1: Jpn. Pat. Appln. KOKAI Publication No. 2010-017395 
       
    
     BRIEF SUMMARY OF THE INVENTION 
     In the technique disclosed in Patent document 1, in order to pinpoint an enemy character, an operation of “drawing a locus surrounding an enemy character” is executed. This operation realizes an easy-to-understand operability which is unique to the game using the touch panel, but this operation is unnatural in a game simulating a real shooting. 
     Specifically, in a game simulating a real shooting, for example, in a game simulating a long-distance shooting, for example, it appears more natural to adopt such an operation system that a button operation or the like, which corresponds to a trigger of a sniper&#39;s rifle, is executed in a state in which an enemy character has been captured at the center of the view field of the scope of the sniper&#39;s rifle by using the scope of the sniper&#39;s rifle, and thereby a bullet hits the enemy character. 
     In the case where this kind of game with operability simulating a real shooting is realized by a device with a limited display area, such as a smartphone, a concrete operation may become such that, for example, an enemy character is found out from the screen, the image of the enemy character is enlarged, an arbitrary shooting point is specified, and shooting is actually executed. Specifically, in some cases, a game, which is realized by a device with a limited display area, tends to make an overall operation complex, and a speedy game development may be hindered. 
     On the other hand, there are many shooting games with an auto-aiming function of instantaneously and automatically aiming at a nearby enemy character by performing a predetermined key operation. In particular, in a game in which many enemy characters appear and the numbers of successive shootings of enemy characters are contested, the auto-aiming function is effective, but it is difficult to express a weighting or the like of scores based on a difference in shooting position. 
     The object of the present invention is to provide a shooting game control method and a game system, which can achieve both precise shooting and speedy game development by a simple and easy-to-understand operation. 
     In general, according to one embodiment, a shooting game control method, which is executed by a computer incorporated in a device including a display configured to display a game image and a touch panel module provided integral with the display, includes accepting a touch operation on the touch panel module; displaying a first frame indicative of a shooting effective range on the display in accordance with a position of the touch operation; accepting an instruction for an attack on an attack target in a state in which the first frame is displayed; determining whether the attack target in a game image displayed on the display is within the first frame or not, at a time point when the operation for the attack has been accepted; and controlling the attack on the attack target in the game image in accordance with a result of the determining. 
     According to the present invention, it is possible to achieve both precise shooting and speedy game development by a simple and easy-to-understand operation. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention. 
         FIG. 1  is a block diagram illustrating a functional configuration of electric circuits of a smartphone according to an embodiment of the invention. 
         FIG. 2  is a flowchart illustrating the content of a process in association with a touch operation during a shooting game in the embodiment. 
         FIG. 3  is a view illustrating an image of a part of a shooting button circle which is displayed during the game in the embodiment. 
         FIG. 4  is a view illustrating an image of a part of a shooting button circle which, is displayed during the game in the embodiment. 
         FIG. 5  is a view illustrating an image of a part of a shooting button circle which is displayed during the game in the embodiment. 
         FIG. 6  is a view illustrating an image of a part of a shooting button circle which is displayed during the game in the embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     An embodiment in a case where the invention is applied to a shooting game program, which is executed by a smartphone, will now be described with reference to the accompanying drawings. 
       FIG. 1  is a block diagram illustrating a functional configuration of electronic circuits of a smartphone  10  according to the embodiment. In  FIG. 1 , a CPU  11  executes a control operation of the entirety of the smartphone  10 . A main memory  12 , a solid-state drive (SSD)  13 , a 3G &amp; 4G communication unit  14 , a wireless LAN communication unit  15 , an external memory card  16 , a display unit  17 , a touch panel unit  18 , a key input unit  19 , an audio processor  20 , and an image processor  21  are connected to the CPU  11  via a system bus SB. 
     The CPU  11  reads out programs (an operating system (OS) and an application program running on the OS) stored in the solid-state drive  13  and fixed pattern data, develops and loads them in the main memory  12 , and executes the programs, thereby comprehensively controlling the entire operation of the smartphone  10 . 
     The main memory  12  is composed of, for example, an SRAM, and functions as a work memory of the CPU  11 . The solid-state drive  13  is composed of a nonvolatile memory, for instance, a flash memory, and stores, as a storage medium of the smartphone  10 , various content data such as image data and song data, as well as the above-described operation programs and various fixed pattern data. 
     The 3G &amp; 4G communication unit  14  is a communication unit which operates in a dual mode, and transmits/receives data to/from a nearby base station (not shown) via an antenna  22 , based on a third-generation mobile communication system according to the IMT-2000 standard, and a fourth-generation mobile communication system according to the IMT-Advance standard. 
     The wireless LAN communication unit  15  transmits/receives data to/from a nearby access point (not shown) or the like via an antenna  23 , based on, for example, the IEEE802.11a/b/g/n standard. 
     The display unit  17  is composed of a backlight-equipped TFT color liquid crystal panel, and a driving unit thereof. The display unit  17  displays various images. 
     The touch panel unit  18  is configured to be integral with the display unit  17  by using a transparent electrode. The touch panel unit  18  generates and outputs two-dimensional position coordinate information which corresponds to a touch operation by the user. 
     The key input unit  19  is composed of some key switches including a power key and a shutter key of a camera function, which are provided on the casing of the smartphone  10 , and a driving circuit of these key switches. 
     The audio processor  20  converts digital audio data, which is delivered via the system bus SB, to an analog audio signal, and outputs the analog audio signal from a speaker  24 . In addition, the audio processor  20  samples an analog audio signal, which is input from a microphone  25 , converts the analog audio signal to digital data and outputs the digital data. 
     The image processor  21  converts to digital data an image signal which is output from a solid-state imaging device  27  in accordance with an optical image which is focused on an imaging surface of the solid-state imaging device  27  via an optical lens system  26 . The solid-state imaging device  27  is composed of, for example, a CCD (Charge Coupled Device). The image processor  21  creates and outputs file data which is compressed in data amount by a preset file format, for example, by JPEG (Joint Photographic Experts Group) in the case of a still image. 
     Next, an operation in the embodiment is described. 
     The operation to be described below is executed after the CPU  11  has read out an application program for a shooting game that is stored in the solid-state drive  13 , as described above, and has developed and loaded the application program in the main memory  12 . The application program stored in the solid-state drive  13  is not limited to a program which was stored in the solid-state drive  13  at a time of factory shipment of the smartphone  10 , and may be a program which is downloaded from the outside by the user of the smartphone  10  via the antenna  22  and 3G &amp; 4G communication unit  14 , or the antenna  23  and wireless LAN communication unit  15 . 
       FIG. 2  is a view which extracts and illustrates the content of a process of a shooting action in association with a touch operation on the touch panel unit  18 , the process being executed by the CPU  11  in the shooting game with the progress of the game. 
     At the beginning of the process, the CPU  11  repeatedly determines whether a touch operation by a user has been executed on the touch panel unit  18 , thus standing by for a touch operation (step S 101 ). 
     When a touch operation has been executed, the CPU  11 , which has determined this touch operation in step S 101 , acquires coordinates of the touch-operated position from the touch panel unit  18 , searches a predetermined range centering at the touch-operated position in the game image which is being displayed on the display unit  17  at that time. To be more specific, the CPU  11  searches a range which is within a target circle TC (to be described later) and is covered by an auto-aiming function, and searches for an attack target in the course of progress of the game (step S 102 ). 
     Based on the search result, the CPU  11  determines whether the attack target exists at the touch-operated position and the attack target has been directly designated by the touch operation (step S 103 ). 
     If it is determined that the attack target exists at the touch-operated position and the attack target has been directly designated by the touch operation, the CPU  11  causes the display unit  17  to display a shooting button circle SC centering at the touch-operated position (step S 104 ). 
       FIG. 3  is a view illustrating an image of the part of the shooting button circle SC which is displayed on the display unit  17  at this time. As illustrated in  FIG. 3 , the shooting button circle SC simulates an image of an optical sight (scope) centering at cross hair CH having a cross shape, which is disposed at the touch position.  FIG. 3  shows the state in which the central cross hair CH is displayed such that the cross hair CH overlaps a substantially central part of the chest region of an attack target MT. 
     In this shooting game, it is assumed that the outer frame of the shooting button circle SC functions as an operation element which instructs movement of a shooting position by a slide operation by the user, and the inner part of the shooting button circle SC functions as a button for instructing shooting. 
     While executing the above-described display, the CPU  11  determines, based on an input from the touch panel unit  18 , whether a touch operation has been executed in the shooting button circle SC within a predetermined time period, for example, within two seconds (step S 105 ). 
     If it is determined that a touch operation has been executed in the shooting button circle SC, the CPU  11  executes shooting at the attack target MT with the progress of the game, and executes a process for an expression by video and audio, and a process for a score, deeming that a bullet hit the attack target MT (step S 106 ). Thereafter, the CPU  11  returns to the process from step S 101 , in preparation for a touch operation on the next attack target. 
     In step S 105 , if no touch operation has been executed in the shooting button circle SC within the predetermined time period, for example, within two seconds, the CPU  11  releases the display of the shooting button circle SC and the cross hair CH shown in  FIG. 3 , and returns to the process from step S 101 , in preparation for a touch operation on the next attack target. 
     In step S 103 , if it is determined that the attack target does not exist at the position which has been touch-operated by the user and that the attack target has not been directly designated by the touch operation, the CPU  11  causes the touch panel unit  18  to display a shooting button circle SC and a target circle TC which concentrically center at the touch-operated position (step S 107 ). 
       FIG. 4  is a view illustrating an image of the part of the shooting button circle SC which is displayed on the display unit  17  at this time. As illustrated in  FIG. 4 , the shooting button circle SC simulates an image of the view field of an optical sight (scope) centering at cross hair CH having a cross shape, which is disposed at the touch position. The concentric target circle TC is displayed inside the shooting button circle SC, for example, by a red broken line (a black broken line in  FIG. 4 ). The target circle TC is representative of a range in which a bullet can hit an attack target by executing shooting by an auto-aiming function. 
       FIG. 4  illustrates a state in which the attack target MT deviates from the cross hair CH, but a major part of the upper body is within the target circle TC and it is highly possible that shooting is successfully executed by the auto-aiming function and a bullet hits the attack target MT. 
     The CPU  11  determines, based on an input from the touch panel unit  18 , whether an outer edge of the shooting button circle SC has been touch-operated in the state in which the shooting button circle SC, together with the target circle TC, is displayed on the display unit  17  (step S 108 ). 
     If it is determined that the outer edge of the shooting button circle SC has not been touch-operated, the CPU  11  further determines, based on an input from the touch panel unit  18 , whether an inside of the shooting button circle SC has been touch-operated (step S 109 ). 
     If it is determined that the inside of the shooting button circle SC has not been touch-operated, either, the CPU  11  returns to the process from step S 108 . 
     In this manner, by repeatedly executing the process of steps S 108  and S 109 , the CPU  11  stands by for a touch operation on the outer edge or the inside of the shooting button circle SC, while keeping the display state on the display unit  17  as shown in  FIG. 4 . 
     In the case where the outer edge of the shooting button circle SC has been touch-operated, if this operation is determined in step S 108 , the CPU  11  accepts a subsequent slide operation of moving the touch operation while the touch state on the touch panel unit  18  is being kept. Based on the accepted content, the CPU  11  moves the display position of the shooting button circle SC and target circle TC (step S 110 ). 
     Then, in accordance with this movement, the CPU  11  determines whether the attack target exists at the position of the newly moved cross hair CH and the attack target can directly be shot (step S 111 ). 
     If it is determined that the attack target does not exist at the position of the moved cross hair CH and the attack target cannot directly be shot, the CPU  11  returns to the process from step S 108 . 
     In step S 111 , if it is determined that the attack target exists at the position of the moved cross hair CH and the attack target can directly be shot, the CPU  11  turns off the display of the target circle TC on the touch panel unit  18 , and effects such a display state, as shown in  FIG. 3 , in which only the shooting button circle SC and cross hair CH are displayed in association with the attack target MT (step S 112 ). 
     Then, the CPU  11  determines, based on an input from the touch panel unit  18 , whether a touch operation has been executed in the shooting button circle SC within a predetermined time period, for example, within two seconds (step S 113 ). 
     If it is determined that a touch operation has been executed in the shooting button circle SC, the CPU  11  executes shooting at the attack target MT with the progress of the game, and executes a process for an expression by video and audio, and a process for a score, deeming that a bullet hit the attack target MT (step S 114 ). Thereafter, the CPU  11  returns to the process from step S 101 , in preparation for a touch operation on the next attack target. 
     In step S 113 , if no touch operation has been executed in the shooting button circle SC within the predetermined time period, for example, within two seconds, the CPU  11  releases the display of the shooting button circle SC and cross hair CH, and returns to the process from step S 101 , in preparation for a touch operation on the next attack target. 
     In the case where a touch operation has been executed in the shooting button circle SC in the state in which the shooting button circle SC and target circle TC are being displayed on the display unit  17 , as shown in  FIG. 4 , if the CPU  11  determines this operation in step S 109 , the CPU  11  determines whether the attack target MT exists in the target circle TC at this time (step S 115 ). 
     If it is determined that the attack target MT exists in the target circle TC, the CPU  11  auto-aims at the attack target MT existing in the target circle TC, and causes the position of the cross hair CH to be displayed on the display unit  17  in accordance with the position of the attack target MT (step S 116 ). If there is a plurality of attack targets in the target circle TC, the CPU  11  auto-aims at the attack target MT existing close to the cross hair CH. 
       FIG. 5  is a view illustrating an image of the part of the shooting button circle SC which is displayed on the display unit  17  at this time.  FIG. 5  shows a state in which the cross hair CH are moved away from the center of the target circle TC by the auto-aiming function, so as to locate the position of the attack target MT existing in the shooting button circle SC. 
     In this manner, at the same time as the cross hair CH is moved to the attack target MT by the auto-aiming function and is displayed, the CPU  11  automatically executes shooting at the attack target MT, and executes a process for an expression by video and audio, and a process for a score, deeming that a bullet hit the attack target MT (step S 117 ). Thereafter, the CPU  11  returns to the process from step S 101 , in preparation for a touch operation on the next attack target. 
     If it is determined in step S 115  that the attack target MT does not exist in the target circle TC, there is no attack target, despite shooting having been instructed by the user&#39;s touch operation, and the auto-aiming function cannot be executed. Thus, the CPU  11  executes shooting, without moving the position of the cross hair CH, which is displayed on the display unit  17 , away from the center of the target circle TC, and executes a process for an expression by video and audio, deeming that shooting was executed in the state in which there was no attack target MT (step S 118 ). Thereafter, the CPU  11  returns to the process from step S 101 , in preparation for a touch operation on the next attack target. 
     In the meantime, as illustrated also in  FIG. 3  to  FIG. 5 , while the shooting operation is executed by touch-operating the inside of the shooting button circle SC, the position of the shooting button circle SC can be moved by slide-operating the outer frame of the shooting button circle SC. 
     Thus, shooting at the attack target MT can easily be executed by slide-operating the shooting button circle SC so that the attack target MT may fall within the target circle TC that is disposed inside the shooting button circle SC, and then executing a touch operation in the shooting button circle SC. 
     In the case where scores by shooting results on the game are different depending on regions constituting the attack target MT, for instance, a body region, a head region and a leg region of the attack target MT, the outer frame of the shooting button circle SC is slide-operated such that a region with a higher score coincides with the cross hair, within an allowable range of time. Thereby, the user can aim at a higher score. Thus, the capabilities of the game can be enhanced, without varying the simple operability. 
     In the above-described embodiment, shooting is executed within the shooting button circle SC, and the movement of the shooting button circle SC is executed by slide-operating the outer frame portion of the shooting button circle SC. However, for example, in the smartphone  10  including the display unit  17  with a size of about 4 inches in diagonal, when operating separately the outer frame portion and the inside of the shooting button circle SC, operation to the outer frame portion of the circle that the user intended, likely to be incorrectly detected as an operation of the inside of the shooting button circle SC. In this case, even if the user intended for operation to the outer frame portion of the shooting button circle SC, it is a possible that the shooting button circle SC is not moving, shooting is performed immediately. 
     Taking this into account, as illustrated in  FIG. 6 , a plurality of handle buttons HB for a slide operation may be disposed in advance on a periphery of the outer edge portion of the shooting button circle SC, and any one of the handle buttons HB may be slide-operated. Thereby, the movement of the shooting button circle SC may be executed. 
     Specifically,  FIG. 6  illustrates an example in which handle buttons HB are disposed at four locations, i.e. at upper, lower, left and right parts, of the outer periphery of the shooting button circle SC. Even if an outer edge portion of the shooting button circle SC, other than these handle buttons HB, is operated, the movement of the shooting button circle SC is disabled, and an erroneous operation can be avoided. 
     The number of handle buttons HB, which are disposed, and the positions thereof are not limited to the example illustrated in  FIG. 4 , and other various modifications may be thinkable. 
     As has been described above in detail, according to the present embodiment, it is possible to achieve both precise shooting and speedy game development by a simple and easy-to-understand operation, in a device including a touch-panel-type display unit and having a limited display area. 
     In addition, in the embodiment, the range of shooting is moved by slide-operating the outer edge of the shooting button circle SC which is broader than the target circle TC. Thus, the display range, which becomes a shooting target, is not hidden by the user&#39;s fingers, and an operation can be continued while the display range is always being visually recognized. 
     In the embodiment, shooting is executed by a touch operation in the shooting button circle SC. Thus, the shooting is not executed by greatly moving the finger from a previous operation of moving the shooting button circle SC and then operating a button at another area, and a transition can be made to the operation of executing instant shooting. Therefore, the game with speedier development can be realized. 
     As illustrated in  FIG. 6 , in the above embodiment, the handle buttons HB for operating the slide movement of the shooting button circle SC may be provided. Thus, by properly disposing the handle buttons HB where necessary, the useless occurrence of an erroneous operation can surely be avoided. 
     In the embodiment, both the shooting button circle SC and the target circle TC have circular shapes. However, the invention is not limited to this example. For example, the shape of the shooting button circle SC and the target circle TC may be converted into a rectangular slit-shaped simulating a loophole, and rectangular or other shapes simulating a window. Specifically, the shape of the range capable of shooting and the shape of the range for instructing the execution of the shooting are not limited. Specifically, the shape of the range for instructing the execution of the shooting and shows a range capable of shooting is not limited. 
     In the above embodiment, the game is executed in a stand-alone mode, based on a game program pre-installed in the smartphone  10 . However, the invention is not limited to this example, and the game may be executed as an online game in a state in which the smartphone  10 , which functions as a terminal device, is wirelessly connected to a game server apparatus over a network. 
     In this case, the smartphone  10  displays a game image and executes an input such as a touch operation on the game image. On the other hand, the game server apparatus executes a process of, in particular, determination of success/failure of an attack, and addition of scores at a time of a success. 
     The present invention is not limited to the above-described embodiments. In practice, various modifications may be made without departing from the spirit of the invention. In addition, the functions executed in the embodiments may be implemented by being properly combined as much as possible. The above-described embodiments include inventions in various stages, and various inventions can be derived from proper combinations of structural elements disclosed herein. For example, even if some structural elements in all the structural elements disclosed in the embodiments are omitted, if the advantageous effect can be obtained, the structure without such structural elements can be derived as an invention.