Unity3D游戏引擎之iOS自定义游戏摇杆与飞机平滑移动

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。

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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～

[代码]js代码：

001	//////////////////////////////////////////////////////////////

002	// Joystick.js

003	// Penelope iPhone Tutorial

004

005	// Joystick creates a movable joystick (via GUITexture) that

006	// handles touch input, taps, and phases. Dead zones can control

007	// where the joystick input gets picked up and can be normalized.

008

009	// Optionally, you can enable the touchPad property from the editor

010	// to treat this Joystick as a TouchPad. A TouchPad allows the finger

011	// to touch down at any point and it tracks the movement relatively

012	// without moving the graphic

013	//////////////////////////////////////////////////////////////

014

015	@script RequireComponent( GUITexture )

016

017	// A simple class for bounding how far the GUITexture will move

018	class Boundary

019

{

020	var min : Vector2 = Vector2.zero;

021	var max : Vector2 = Vector2.zero;

022

}

023

024	static private var joysticks : Joystick[]; // A static collection of all joysticks

025	static private var enumeratedJoysticks : boolean = false;

026	static private var tapTimeDelta : float = 0.3; // Time allowed between taps

027

028	var touchPad : boolean; // Is this a TouchPad?

029	var touchZone : Rect;

030	var deadZone : Vector2 = Vector2.zero; // Control when position is output

031	var normalize : boolean = false; // Normalize output after the dead-zone?

032	var position : Vector2; // [-1, 1] in x,y

033	var tapCount : int; // Current tap count

034

035	private var lastFingerId = -1; // Finger last used for this joystick

036	private var tapTimeWindow : float; // How much time there is left for a tap to occur

037	private var fingerDownPos : Vector2;

038	private var fingerDownTime : float;

039	private var firstDeltaTime : float = 0.5;

040

041	private var gui : GUITexture; // Joystick graphic

042	private var defaultRect : Rect; // Default position / extents of the joystick graphic

043	private var guiBoundary : Boundary = Boundary(); // Boundary for joystick graphic

044	private var guiTouchOffset : Vector2; // Offset to apply to touch input

045	private var guiCenter : Vector2; // Center of joystick

046

047	function Start()

048

{

049	// Cache this component at startup instead of looking up every frame

050	gui = GetComponent( GUITexture );

051

052	// Store the default rect for the gui, so we can snap back to it

053	defaultRect = gui.pixelInset;

054

055	defaultRect.x += transform.position.x * Screen.width;// + gui.pixelInset.x; // - Screen.width * 0.5;

056	defaultRect.y += transform.position.y * Screen.height;// - Screen.height * 0.5;

057

058	transform.position.x = 0.0;

059	transform.position.y = 0.0;

060

061	if ( touchPad )

062

{

063	// If a texture has been assigned, then use the rect ferom the gui as our touchZone

064	if ( gui.texture )

065	touchZone = defaultRect;

066

}

067

else

068

{

069	// This is an offset for touch input to match with the top left

070	// corner of the GUI

071	guiTouchOffset.x = defaultRect.width * 0.5;

072	guiTouchOffset.y = defaultRect.height * 0.5;

073

074	// Cache the center of the GUI, since it doesn't change

075	guiCenter.x = defaultRect.x + guiTouchOffset.x;

076	guiCenter.y = defaultRect.y + guiTouchOffset.y;

077

078	// Let's build the GUI boundary, so we can clamp joystick movement

079	guiBoundary.min.x = defaultRect.x - guiTouchOffset.x;

080	guiBoundary.max.x = defaultRect.x + guiTouchOffset.x;

081	guiBoundary.min.y = defaultRect.y - guiTouchOffset.y;

082	guiBoundary.max.y = defaultRect.y + guiTouchOffset.y;

083

}

084

}

085

086	function Disable()

087

{

088	gameObject.active = false;

089	enumeratedJoysticks = false;

090

}

091

092	function ResetJoystick()

093

{

094	// Release the finger control and set the joystick back to the default position

095	gui.pixelInset = defaultRect;

096	lastFingerId = -1;

097	position = Vector2.zero;

098	fingerDownPosition = Vector2.zero;

099

100	if ( touchPad )

101	gui.color.a = 0.025;

102

}

103

104	function IsFingerDown() : boolean

105

{

106	return (lastFingerId != -1);

107

}

108

109	function LatchedFinger( fingerId : int )

110

{

111	// If another joystick has latched this finger, then we must release it

112	if ( lastFingerId == fingerId )

113	ResetJoystick();

114

}

115

116	function Update()

117

{

118	if ( !enumeratedJoysticks )

119

{

120	// Collect all joysticks in the game, so we can relay finger latching messages

121	joysticks = FindObjectsOfType( Joystick );

122	enumeratedJoysticks = true;

123

}

124

125	var count = Input.touchCount;

126

127	// Adjust the tap time window while it still available

128	if ( tapTimeWindow > 0 )

129	tapTimeWindow -= Time.deltaTime;

130

else

131	tapCount = 0;

132

133	if ( count == 0 )

134	ResetJoystick();

135

else

136

{

137	for(var i : int = 0;i < count; i++)

138

{

139	var touch : Touch = Input.GetTouch(i);

140	var guiTouchPos : Vector2 = touch.position - guiTouchOffset;

141

142	var shouldLatchFinger = false;

143	if ( touchPad )

144

{

145	if ( touchZone.Contains( touch.position ) )

146	shouldLatchFinger = true;

147

}

148	else if ( gui.HitTest( touch.position ) )

149

{

150	shouldLatchFinger = true;

151

}

152

153	// Latch the finger if this is a new touch

154	if ( shouldLatchFinger && ( lastFingerId == -1 \|\| lastFingerId != touch.fingerId ) )

155

{

156

157	if ( touchPad )

158

{

159	gui.color.a = 0.15;

160

161	lastFingerId = touch.fingerId;

162	fingerDownPos = touch.position;

163	fingerDownTime = Time.time;

164

}

165

166	lastFingerId = touch.fingerId;

167

168	// Accumulate taps if it is within the time window

169	if ( tapTimeWindow > 0 )

170	tapCount++;

171

else

172

{

173	tapCount = 1;

174	tapTimeWindow = tapTimeDelta;

175

}

176

177	// Tell other joysticks we've latched this finger

178	for ( var j : Joystick in joysticks )

179

{

180	if ( j != this )

181	j.LatchedFinger( touch.fingerId );

182

}

183

}

184

185	if ( lastFingerId == touch.fingerId )

186

{

187	// Override the tap count with what the iPhone SDK reports if it is greater

188	// This is a workaround, since the iPhone SDK does not currently track taps

189	// for multiple touches

190	if ( touch.tapCount > tapCount )

191	tapCount = touch.tapCount;

192

193	if ( touchPad )

194

{

195	// For a touchpad, let's just set the position directly based on distance from initial touchdown

196	position.x = Mathf.Clamp( ( touch.position.x - fingerDownPos.x ) / ( touchZone.width / 2 ), -1, 1 );

197	position.y = Mathf.Clamp( ( touch.position.y - fingerDownPos.y ) / ( touchZone.height / 2 ), -1, 1 );

198

}

199

else

200

{

201	// Change the location of the joystick graphic to match where the touch is

202	gui.pixelInset.x = Mathf.Clamp( guiTouchPos.x, guiBoundary.min.x, guiBoundary.max.x );

203	gui.pixelInset.y = Mathf.Clamp( guiTouchPos.y, guiBoundary.min.y, guiBoundary.max.y );

204

}

205

206	if ( touch.phase == TouchPhase.Ended \|\| touch.phase == TouchPhase.Canceled )

207	ResetJoystick();

208

}

209

}

210

}

211

212	if ( !touchPad )

213

{

214	// Get a value between -1 and 1 based on the joystick graphic location

215	position.x = ( gui.pixelInset.x + guiTouchOffset.x - guiCenter.x ) / guiTouchOffset.x;

216	position.y = ( gui.pixelInset.y + guiTouchOffset.y - guiCenter.y ) / guiTouchOffset.y;

217

}

218

219	// Adjust for dead zone

220	var absoluteX = Mathf.Abs( position.x );

221	var absoluteY = Mathf.Abs( position.y );

222

223	if ( absoluteX < deadZone.x )

224

{

225	// Report the joystick as being at the center if it is within the dead zone

226	position.x = 0;

227

}

228	else if ( normalize )

229

{

230	// Rescale the output after taking the dead zone into account

231	position.x = Mathf.Sign( position.x ) * ( absoluteX - deadZone.x ) / ( 1 - deadZone.x );

232

}

233

234	if ( absoluteY < deadZone.y )

235

{

236	// Report the joystick as being at the center if it is within the dead zone

237	position.y = 0;

238

}

239	else if ( normalize )

240

{

241	// Rescale the output after taking the dead zone into account

242	position.y = Mathf.Sign( position.y ) * ( absoluteY - deadZone.y ) / ( 1 - deadZone.y );

243

}

244

}

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。

[代码]js代码：

//游戏摇杆对象

02	var moveJoystick : Joystick;

//飞机的贴图

05	var plan : Texture;

07	//飞机在屏幕中的坐标

08	var x = 0;

09	var y = 0;

11	//避免飞机飞出屏幕，分别是X、Y最大坐标，最小坐标是0、0

12	var cross_x = 0;

13	var cross_y = 0;

//飞机移动的速度

16	var planSpeed = 20;

18	function Start() {

//初始化赋值

x = 100;

y = 100;

22	cross_x = Screen.width - plan.width;

23	cross_y = Screen.height - plan.height;

}

27	function Update () {

28	//得到游戏摇杆的反馈信息，得到的值是 -1 到 +1 之间

30	var touchKey_x = moveJoystick.position.x;

31	var touchKey_y = moveJoystick.position.y;

//摇杆向左

34	if(touchKey_x == -1){

35	x -= planSpeed;

}

//摇杆向右

39	else if(touchKey_x == 1){

40	x += planSpeed;

}

//摇杆向上

44	if(touchKey_y == -1){

45	y += planSpeed;

}

//摇杆向下

49	else if(touchKey_y == 1){

50	y -= planSpeed;

}

54	//防止飞机飞出屏幕，出界检测

55	if(x < 0){

x = 0;

57	}else if(x > cross_x){

58	x = cross_x;

}

61	if(y < 0){

y = 0;

63	}else if(y > cross_y){

64	y = cross_y;

}

71	function OnGUI () {

74	//将飞机绘制在屏幕中

75	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～～

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Unity3D游戏引擎之iOS自定义游戏摇杆与飞机平滑移动

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