如何以度数旋转视图？我有以下代码设置我的视图...
public class GLLayer extends GLSurfaceView implements SurfaceHolder.Callback,
Camera.PreviewCallback, Renderer {
int onDrawFrameCounter=1;
int[] cameraTexture;
byte[] glCameraFrame=new byte[256*256]; //size of a texture must be a power of 2
FloatBuffer cubeBuff;
FloatBuffer texBuff;
public float startbear;
public GLLayer(Context c) {
super(c);
this.setEGLConfigChooser(8, 8, 8, 8, 16, 0);
this.setRenderer(this);
this.getHolder().setFormat(PixelFormat.TRANSPARENT);
}
public void onDrawFrame(GL10 gl) {
onDrawFrameCounter++;
gl.glEnable(GL10.GL_TEXTURE_2D);
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
bindCameraTexture(gl);
gl.glLoadIdentity();
GLU.gluLookAt(gl, 0, 0, 4.2f, 0, 0, 0, 0, 1, 0);
//gl.glRotatef(onDrawFrameCounter,1,0,0); //Rotate the camera image
//gl.glRotatef((float)Math.sin(onDrawFrameCounter/20.0f)*40,0,1,0); //Rotate the camera image
//gl.glRotatef((float)Math.cos(onDrawFrameCounter/40.0f)*40,0,0,1); //Rotate the camera image
gl.glNormal3f(0,0,1);
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4);
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 4, 4);
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 8, 4);
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP,12, 4);
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP,16, 4);
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP,20, 4);
}
public void onSurfaceChanged(GL10 gl, int width, int height) {
gl.glViewport(0, 0, width, height);
float ratio = (float) width / height;
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
gl.glFrustumf(-ratio, ratio, -1, 1, 1, 10);
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
GLU.gluLookAt(gl, 0, 0, 4.2f, 0, 0, 0, 0, 1, 0);
}
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
startbear = Global.bearing;
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
gl.glClearColor(0, 0, 0, 0);
gl.glEnable(GL10.GL_CULL_FACE);
gl.glShadeModel(GL10.GL_SMOOTH);
gl.glEnable(GL10.GL_DEPTH_TEST);
cubeBuff = makeFloatBuffer(camObjCoord);
texBuff = makeFloatBuffer(camTexCoords);
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, cubeBuff);
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, texBuff);
gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
}
/**
* Generates a texture from the black and white array filled by the onPreviewFrame
* method.
*/
void bindCameraTexture(GL10 gl) {
synchronized(this) {
if (cameraTexture==null)
cameraTexture=new int[1];
else
gl.glDeleteTextures(1, cameraTexture, 0);
gl.glGenTextures(1, cameraTexture, 0);
int tex = cameraTexture[0];
gl.glBindTexture(GL10.GL_TEXTURE_2D, tex);
gl.glTexImage2D(GL10.GL_TEXTURE_2D, 0, GL10.GL_LUMINANCE, 256, 256, 0, GL10.GL_LUMINANCE, GL10.GL_UNSIGNED_BYTE, ByteBuffer.wrap(glCameraFrame));
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
}
}
/**
* This method is called if a new image from the camera arrived. The camera
* delivers images in a yuv color format. It is converted to a black and white
* image with a size of 256x256 pixels (only a fraction of the resulting image
* is used). Afterwards Rendering the frame (in the main loop thread) is started by
* setting the newFrameLock to true.
*/
public void onPreviewFrame(byte[] yuvs, Camera camera) {
int bwCounter=0;
int yuvsCounter=0;
for (int y=0;y<160;y++) {
System.arraycopy(yuvs, yuvsCounter, glCameraFrame, bwCounter, 240);
yuvsCounter=yuvsCounter+240;
bwCounter=bwCounter+256;
}
}
FloatBuffer makeFloatBuffer(float[] arr) {
ByteBuffer bb = ByteBuffer.allocateDirect(arr.length*4);
bb.order(ByteOrder.nativeOrder());
FloatBuffer fb = bb.asFloatBuffer();
fb.put(arr);
fb.position(0);
return fb;
}
final static float camObjCoord[] = new float[] {
// FRONT
-2.0f, -1.5f, 12.0f,
2.0f, -1.5f, 12.0f,
-2.0f, 1.5f, 12.0f,
2.0f, 1.5f, 12.0f,
// BACK
-2.0f, -1.5f, 8.0f,
-2.0f, 1.5f, 8.0f,
2.0f, -1.5f, 8.0f,
2.0f, 1.5f, 8.0f,
// LEFT
-2.0f, -1.5f, 12.0f,
-2.0f, 1.5f, 12.0f,
-2.0f, -1.5f, 8.0f,
-2.0f, 1.5f, 8.0f,
// RIGHT
2.0f, -1.5f, 8.0f,
2.0f, 1.5f, 8.0f,
2.0f, -1.5f, 12.0f,
2.0f, 1.5f, 12.0f,
// TOP
-2.0f, 1.5f, 12.0f,
2.0f, 1.5f, 12.0f,
-2.0f, 1.5f, 8.0f,
2.0f, 1.5f, 8.0f,
// BOTTOM
-2.0f, -1.5f, 12.0f,
-2.0f, -1.5f, 8.0f,
2.0f, -1.5f, 12.0f,
2.0f, -1.5f, 8.0f,
};
final static float camTexCoords[] = new float[] {
// Camera preview
0.0f, 0.0f,
0.9375f, 0.0f,
0.0f, 0.625f,
0.9375f, 0.625f,
// BACK
0.9375f, 0.0f,
0.9375f, 0.625f,
0.0f, 0.0f,
0.0f, 0.625f,
// LEFT
0.9375f, 0.0f,
0.9375f, 0.625f,
0.0f, 0.0f,
0.0f, 0.625f,
// RIGHT
0.9375f, 0.0f,
0.9375f, 0.625f,
0.0f, 0.0f,
0.0f, 0.625f,
// TOP
0.0f, 0.0f,
0.9375f, 0.0f,
0.0f, 0.625f,
0.9375f, 0.625f,
// BOTTOM
0.9375f, 0.0f,
0.9375f, 0.625f,
0.0f, 0.0f,
0.0f, 0.625f
};
}
我想改变我的学位观点......我该怎么做？我假设我使用glrotate但我怎么样？ （仅在x轴上）
//只是澄清我实际上是在寻找视图转换，以便我周围的世界根据相机设备的方向旋转X度。
答案 0 :(得分：1)
如果要旋转整个视图，可以尝试旋转画布。
canvas.rotate(90); // 90 degrees
如果你没有canvas，请实现它从View继承的onDraw方法：
onDraw(Canvas canvas) {
canvas.rotate(90); // 90 degrees
}
希望这有效。