Unity3D 游戏引擎之IOS自定义游戏摇杆与飞机平滑的移动（十一）

Unity3D 游戏引擎之IOS自定义游戏摇杆与飞机平滑的移动

雨松MOMO原创文章如转载，请注明：转载至我的独立域名博客雨松MOMO程序研究院，原文地址:http://www.xuanyusong.com/archives/526

移动开发游戏中使用到的触摸游戏摇杆在iPhone上是非常普遍的，毕竟是全触摸屏手机，今天MOMO 通过一个小例子和大家讨论Unity3D 中如何自定义一个漂亮的全触摸游戏摇杆。

值得高兴的是，Unity3D 游戏引擎的标准资源中已经帮助我们封装了一个游戏摇杆脚本，所以实现部分的代码可以完全借助它的，具体调用需要我们自己来。

Joystick.js是官方提供的脚本，具体代码如下，有兴趣的朋友可以仔细研究研究，MOMO就不多说啦。哇咔咔～

//
// Joystick.js
// Penelope iPhone Tutorial
//
// Joystick creates a movable joystick (via GUITexture) that
// handles touch input, taps, and phases. Dead zones can control
// where the joystick input gets picked up and can be normalized.
//
// Optionally, you can enable the touchPad property from the editor
// to treat this Joystick as a TouchPad. A TouchPad allows the finger
// to touch down at any point and it tracks the movement relatively
// without moving the graphic
//@script RequireComponent( GUITexture )// A simple class for bounding how far the GUITexture will move
class Boundary
{var min : Vector2 = Vector2.zero;var max : Vector2 = Vector2.zero;
}static private var joysticks : Joystick[];                 // A static collection of all joysticks
static private var enumeratedJoysticks : boolean = false;
static private var tapTimeDelta : float = 0.3;             // Time allowed between tapsvar touchPad : boolean;                                     // Is this a TouchPad?
var touchZone : Rect;
var deadZone : Vector2 = Vector2.zero;                     // Control when position is output
var normalize : boolean = false;                           // Normalize output after the dead-zone?
var position : Vector2;                                     // [-1, 1] in x,y
var tapCount : int;                                         // Current tap countprivate var lastFingerId = -1;                             // Finger last used for this joystick
private var tapTimeWindow : float;                          // How much time there is left for a tap to occur
private var fingerDownPos : Vector2;
private var fingerDownTime : float;
private var firstDeltaTime : float = 0.5;private var gui : GUITexture;                             // Joystick graphic
private var defaultRect : Rect;                             // Default position / extents of the joystick graphic
private var guiBoundary : Boundary = Boundary();           // Boundary for joystick graphic
private var guiTouchOffset : Vector2;                       // Offset to apply to touch input
private var guiCenter : Vector2;                            // Center of joystickfunction Start()
{// Cache this component at startup instead of looking up every frame   gui = GetComponent( GUITexture );// Store the default rect for the gui, so we can snap back to itdefaultRect = gui.pixelInset;    defaultRect.x += transform.position.x * Screen.width;// + gui.pixelInset.x; // -  Screen.width * 0.5;defaultRect.y += transform.position.y * Screen.height;// - Screen.height * 0.5;transform.position.x = 0.0;transform.position.y = 0.0;if ( touchPad ){// If a texture has been assigned, then use the rect ferom the gui as our touchZoneif ( gui.texture )touchZone = defaultRect;}else{               // This is an offset for touch input to match with the top left// corner of the GUIguiTouchOffset.x = defaultRect.width * 0.5;guiTouchOffset.y = defaultRect.height * 0.5;// Cache the center of the GUI, since it doesn't changeguiCenter.x = defaultRect.x + guiTouchOffset.x;guiCenter.y = defaultRect.y + guiTouchOffset.y;// Let's build the GUI boundary, so we can clamp joystick movementguiBoundary.min.x = defaultRect.x - guiTouchOffset.x;guiBoundary.max.x = defaultRect.x + guiTouchOffset.x;guiBoundary.min.y = defaultRect.y - guiTouchOffset.y;guiBoundary.max.y = defaultRect.y + guiTouchOffset.y;}
}function Disable()
{gameObject.active = false;enumeratedJoysticks = false;
}function ResetJoystick()
{// Release the finger control and set the joystick back to the default positiongui.pixelInset = defaultRect;lastFingerId = -1;position = Vector2.zero;fingerDownPosition = Vector2.zero;if ( touchPad )gui.color.a = 0.025;
}function IsFingerDown() : boolean
{return (lastFingerId != -1);
}function LatchedFinger( fingerId : int )
{// If another joystick has latched this finger, then we must release itif ( lastFingerId == fingerId )ResetJoystick();
}function Update()
{   if ( !enumeratedJoysticks ){// Collect all joysticks in the game, so we can relay finger latching messagesjoysticks = FindObjectsOfType( Joystick );enumeratedJoysticks = true;}  var count = Input.touchCount;// Adjust the tap time window while it still availableif ( tapTimeWindow > 0 )tapTimeWindow -= Time.deltaTime;elsetapCount = 0;if ( count == 0 )ResetJoystick();else{for(var i : int = 0;i < count; i++){var touch : Touch = Input.GetTouch(i);         var guiTouchPos : Vector2 = touch.position - guiTouchOffset;var shouldLatchFinger = false;if ( touchPad ){                if ( touchZone.Contains( touch.position ) )shouldLatchFinger = true;}else if ( gui.HitTest( touch.position ) ){shouldLatchFinger = true;}     // Latch the finger if this is a new touchif ( shouldLatchFinger && ( lastFingerId == -1 || lastFingerId != touch.fingerId ) ){if ( touchPad ){gui.color.a = 0.15;lastFingerId = touch.fingerId;fingerDownPos = touch.position;fingerDownTime = Time.time;}lastFingerId = touch.fingerId;// Accumulate taps if it is within the time windowif ( tapTimeWindow > 0 )tapCount++;else{tapCount = 1;tapTimeWindow = tapTimeDelta;}// Tell other joysticks we've latched this fingerfor ( var j : Joystick in joysticks ){if ( j != this )j.LatchedFinger( touch.fingerId );}                       }               if ( lastFingerId == touch.fingerId ){    // Override the tap count with what the iPhone SDK reports if it is greater// This is a workaround, since the iPhone SDK does not currently track taps// for multiple touchesif ( touch.tapCount > tapCount )tapCount = touch.tapCount;if ( touchPad ){ // For a touchpad, let's just set the position directly based on distance from initial touchdownposition.x = Mathf.Clamp( ( touch.position.x - fingerDownPos.x ) / ( touchZone.width / 2 ), -1, 1 );position.y = Mathf.Clamp( ( touch.position.y - fingerDownPos.y ) / ( touchZone.height / 2 ), -1, 1 );}else{                  // Change the location of the joystick graphic to match where the touch isgui.pixelInset.x =  Mathf.Clamp( guiTouchPos.x, guiBoundary.min.x, guiBoundary.max.x );gui.pixelInset.y =  Mathf.Clamp( guiTouchPos.y, guiBoundary.min.y, guiBoundary.max.y );      }if ( touch.phase == TouchPhase.Ended || touch.phase == TouchPhase.Canceled )ResetJoystick();                   }           }}if ( !touchPad ){// Get a value between -1 and 1 based on the joystick graphic locationposition.x = ( gui.pixelInset.x + guiTouchOffset.x - guiCenter.x ) / guiTouchOffset.x;position.y = ( gui.pixelInset.y + guiTouchOffset.y - guiCenter.y ) / guiTouchOffset.y;}// Adjust for dead zone   var absoluteX = Mathf.Abs( position.x );var absoluteY = Mathf.Abs( position.y );if ( absoluteX < deadZone.x ){// Report the joystick as being at the center if it is within the dead zoneposition.x = 0;}else if ( normalize ){// Rescale the output after taking the dead zone into accountposition.x = Mathf.Sign( position.x ) * ( absoluteX - deadZone.x ) / ( 1 - deadZone.x );}if ( absoluteY < deadZone.y ){// Report the joystick as being at the center if it is within the dead zoneposition.y = 0;}else if ( normalize ){// Rescale the output after taking the dead zone into accountposition.y = Mathf.Sign( position.y ) * ( absoluteY - deadZone.y ) / ( 1 - deadZone.y );}
}

单击Create 创建一个GUI Texture，命名为Joy ，它用来显示游戏摇杆，如下图所示将摇杆的图片资源，与摇杆的脚本连线赋值给Joy. Pixel Inset 中可以设置摇杆的显示位置与显示宽高。

到这一步 build and run 就可以在iPhone上看到这个游戏摇杆，并且可以通过触摸它，360度平滑过度。

在屏幕中绘制一个飞机，通过游戏摇杆去控制飞机的移动。

创建一个脚本，命名为Main.js 如下图所示将 Main.js 、joy、plan 分别绑定在Main Camera 上。

moveJoystick.position.x;

moveJoystick.position.y;

这两个值是非常重要的两个信息，它们的取值范围是 -1 到 +1 ，表示用户触摸摇杆的位置，上下左右的信息。

//游戏摇杆对象
var moveJoystick : Joystick;//飞机的贴图
var plan : Texture;//飞机在屏幕中的坐标
var x = 0;
var y = 0;//避免飞机飞出屏幕，分别是X、Y最大坐标，最小坐标是0、0
var cross_x = 0;
var cross_y = 0;//飞机移动的速度
var planSpeed = 20;function Start() {//初始化赋值x = 100;y = 100;cross_x = Screen.width -  plan.width;cross_y = Screen.height -  plan.height;}function Update () {//得到游戏摇杆的反馈信息，得到的值是 -1 到 +1 之间var touchKey_x =  moveJoystick.position.x;var touchKey_y =  moveJoystick.position.y;//摇杆向左if(touchKey_x == -1){x -= planSpeed;}//摇杆向右else if(touchKey_x == 1){x += planSpeed;}//摇杆向上if(touchKey_y == -1){y += planSpeed;}//摇杆向下else if(touchKey_y == 1){y -= planSpeed;}//防止飞机飞出屏幕，出界检测if(x < 0){x = 0;}else if(x > cross_x){x = cross_x;}if(y < 0){y = 0;}else if(y > cross_y){y = cross_y;}
}function OnGUI () {//将飞机绘制在屏幕中GUI.DrawTexture(Rect(x,y,128,128),plan);  }

导出 build and run 看看在iPhone 上的效果，通过触摸游戏摇杆可以控制飞机的移动啦，不错吧，哇咔咔～～

最后欢迎各位盆友可以和MOMO一起讨论Unity3D游戏开发，最近感冒的盆友越来越多，大家要多多注意身体健康噢。哇咔咔～～～附上Unity3D工程的下载地址，Xcode项目我就不上传了，须要的自己导出。

下载地址：http://www.xuanyusong.com/archives/526

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