Unity如何throw
时间: 2023-06-09 07:07:27 浏览: 44
异常?
在Unity中,可以使用try-catch语句来捕捉异常并用throw语句来抛出异常。例如:
try
{
// Some code that may throw an exception
}
catch (Exception e)
{
// Handle the exception
throw e; // Rethrow the exception
}
这样,当代码块中发生异常时,它将被捕获并使用throw语句重新抛出,使调用代码也可以处理异常。
相关问题
unity工厂模式创建敌人
在Unity中,工厂模式是一种常见的设计模式,用于创建复杂的对象。在创建敌人时,可以使用工厂模式来实现灵活和可扩展的创建过程。
首先,需要定义一个敌人工厂类,该类负责创建不同类型的敌人。例如,可以定义一个EnemyFactory类,并为其添加一个CreateEnemy方法,该方法根据传入的参数类型创建不同类型的敌人。代码示例:
```
public class EnemyFactory {
public Enemy CreateEnemy(EnemyType type) {
switch (type) {
case EnemyType.Normal:
return new NormalEnemy();
case EnemyType.Boss:
return new BossEnemy();
default:
throw new ArgumentException("Invalid enemy type");
}
}
}
```
在上述示例中,EnemyType是一个枚举类型,包含Normal和Boss两种类型的敌人。NormalEnemy和BossEnemy是继承自Enemy类的具体敌人类。
然后,可以使用以下代码在游戏中创建敌人:
```
EnemyFactory factory = new EnemyFactory();
Enemy normalEnemy = factory.CreateEnemy(EnemyType.Normal);
Enemy bossEnemy = factory.CreateEnemy(EnemyType.Boss);
```
这样就可以创建NormalEnemy和BossEnemy对象,并进行后续的游戏逻辑处理。
Unity for Android USBCamera
Unity可以通过Android的Camera2 API来访问USB摄像头。
首先,在Unity中创建一个Android插件,该插件将使用Android的Camera2 API来访问USB摄像头。然后,在Unity中调用该插件以获取从USB摄像头获取的视频数据。
以下是一个简单的Unity Android插件示例,可以用于访问USB摄像头:
```java
public class USBCameraPlugin {
private static CameraDevice camera;
private static CaptureRequest.Builder previewBuilder;
private static SurfaceTexture surfaceTexture;
private static Surface previewSurface;
private static HandlerThread handlerThread;
private static Handler handler;
private static Semaphore cameraOpenCloseLock = new Semaphore(1);
public static void startCamera(int textureId) {
// Open the camera
CameraManager manager = (CameraManager) UnityPlayer.currentActivity.getSystemService(Context.CAMERA_SERVICE);
String[] cameraIds = null;
try {
cameraIds = manager.getCameraIdList();
} catch (CameraAccessException e) {
e.printStackTrace();
}
if (cameraIds == null || cameraIds.length == 0) {
return;
}
String cameraId = cameraIds[0];
try {
if (!cameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
throw new RuntimeException("Time out waiting to lock camera opening.");
}
manager.openCamera(cameraId, new CameraDevice.StateCallback() {
@Override
public void onOpened(@NonNull CameraDevice cameraDevice) {
cameraOpenCloseLock.release();
camera = cameraDevice;
startPreview(textureId);
}
@Override
public void onDisconnected(@NonNull CameraDevice cameraDevice) {
cameraOpenCloseLock.release();
cameraDevice.close();
camera = null;
}
@Override
public void onError(@NonNull CameraDevice cameraDevice, int error) {
cameraOpenCloseLock.release();
cameraDevice.close();
camera = null;
}
}, handler);
} catch (InterruptedException e) {
throw new RuntimeException("Interrupted while trying to lock camera opening.", e);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
public static void stopCamera() {
if (camera != null) {
camera.close();
camera = null;
}
}
private static void startPreview(int textureId) {
if (camera == null) {
return;
}
try {
// Create a surface texture to receive camera data
surfaceTexture = new SurfaceTexture(textureId);
surfaceTexture.setDefaultBufferSize(1920, 1080);
previewSurface = new Surface(surfaceTexture);
// Build the preview request
previewBuilder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
previewBuilder.addTarget(previewSurface);
// Create a handler thread to handle camera events
handlerThread = new HandlerThread("CameraBackground");
handlerThread.start();
handler = new Handler(handlerThread.getLooper());
// Start the preview
camera.createCaptureSession(Arrays.asList(previewSurface), new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
try {
cameraCaptureSession.setRepeatingRequest(previewBuilder.build(), null, handler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {
stopCamera();
}
}, handler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
}
```
然后,在Unity中调用该插件以访问USB摄像头。以下是一个简单的C#脚本示例,可以用于在Unity中调用Android插件并从USB摄像头获取视频数据:
```csharp
public class USBCamera : MonoBehaviour {
private AndroidJavaObject plugin;
private Texture2D texture;
private byte[] data;
private int width = 1920;
private int height = 1080;
void Start () {
// Create the Android plugin object
plugin = new AndroidJavaObject("com.example.usbcamera.USBCameraPlugin");
// Set the texture to display camera data
texture = new Texture2D(width, height, TextureFormat.RGBA32, false);
GetComponent<Renderer>().material.mainTexture = texture;
// Call the Android plugin to start the camera
plugin.Call("startCamera", texture.GetNativeTexturePtr().ToInt32());
}
void OnDestroy() {
// Call the Android plugin to stop the camera
plugin.Call("stopCamera");
}
void Update () {
// Update the texture with the latest camera data
if (data == null) {
data = new byte[width * height * 4];
}
texture.LoadRawTextureData(data);
texture.Apply();
}
private void OnApplicationQuit() {
// Call the Android plugin to stop the camera
plugin.Call("stopCamera");
}
}
```
这样,你就可以在Unity中通过Android插件访问USB摄像头并获取视频数据。
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