Android(安卓)OpenGL之二图像旋转实例

实现GLSurfaceView.Renderer：

public class MyRenderer implements GLSurfaceView.Renderer {

   //GLSurfaceView的被创建时回调该方法
   @Override
   public void onSurfaceCreated(GL10 gl, EGLConfig config) {
       //GL10 is a Interface, GL10 gl???
       gl.glDisable(GL10.GL_DITHER);//关闭抗抖动,
   }

   //GLSurfaceView的大小改变后回调该方法
   @Override
   public void onSurfaceChanged(GL10 gl, int width, int height) {
       // TODO Auto-generated method stub

   }

   //Renderer对象调用该方法绘制GLSurfaceView的当前帧
   @Override
   public void onDrawFrame(GL10 gl) {
       // TODO Auto-generated method stub

   }

}

具体代码如下：：：

public class MyRenderer implements Renderer {

   float[] triangleData = new float[] { 0.1f, 0.6f, 0.0f, -0.3f, 0.0f, 0.0f,
           0.3f, 0.1f, 0.0f };
   int[] triangleColor = new int[] { 65535, 0, 0, 0, 0, 65535, 0, 0, 0, 0,
           65535, 0 };
   float[] rectData = new float[] { 0.4f, 0.4f, 0.0f, 0.4f, -0.4f, 0.0f,
           -0.4f, 0.4f, 0.0f, -0.4f, -0.4f, 0.0f };
   int[] rectColor = new int[] { 0, 65535, 0, 0, 0, 0, 65535, 0, 65535, 0, 0,
           0, 65535, 65535, 0, 0 };
   float[] rectData2 = new float[] { -0.4f, 0.4f, 0.0f, 0.4f, 0.4f, 0.0f,
           0.4f, -0.4f, 0.0f, -0.4f, -0.4f, 0.0f };
   float[] pentacle = new float[] { 0.4f, 0.4f, 0.0f, -0.2f, 0.3f, 0.0f, 0.5f,
           0.0f, 0f, -0.4f, 0.0f, 0f, -0.1f, -0.3f, 0f };

   FloatBuffer triangleDataBuffer;
   IntBuffer triangleColorBuffer;
   FloatBuffer rectDataBuffer;
   IntBuffer rectColorBuffer;
   FloatBuffer rectDataBuffer2;
   FloatBuffer pentacleBuffer;
   private float rotate;

   public MyRenderer() {
       triangleDataBuffer = FloatBuffer.wrap(triangleData);
       rectDataBuffer = FloatBuffer.wrap(rectData);
       rectDataBuffer2 = FloatBuffer.wrap(rectData2);
       pentacleBuffer = FloatBuffer.wrap(pentacle);
       triangleColorBuffer = IntBuffer.wrap(triangleColor);
       rectColorBuffer = IntBuffer.wrap(rectColor);
   }

   @Override
   public void onSurfaceCreated(GL10 gl, EGLConfig config) {
       gl.glDisable(GL10.GL_DITHER);
       gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
       gl.glClearColor(0, 0, 0, 0);
       gl.glShadeModel(GL10.GL_SMOOTH);
       gl.glEnable(GL10.GL_DEPTH_TEST);
       gl.glDepthFunc(GL10.GL_LEQUAL);
   }

   @Override
   public void onSurfaceChanged(GL10 gl, int width, int height) {
       // 设置3d视图的大小以及位置
       gl.glViewport(0, 0, width, height);
       // 将当前矩阵模型设置为投影矩阵
       gl.glMatrixMode(GL10.GL_PROJECTION);
       // 初始化单位矩阵
       gl.glLoadIdentity();
       // 计算透视高度/高度比
       float ratio = (float) width / height;
       gl.glFrustumf(-ratio, ratio, -1, 1, 1, 10);
   }

   @Override
   public void onDrawFrame(GL10 gl) {
       // 清除屏幕缓存和深度缓存
       gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
       // 启用顶点坐标数据
       gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
       // 启用顶点颜色数据
       gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
       // 设置当前矩阵堆栈为模型堆栈
       gl.glMatrixMode(GL10.GL_MODELVIEW);

       // 重置当前模型视图矩阵
       gl.glLoadIdentity();
       gl.glTranslatef(-0.32f, 0.35f, -1f);
       // 设置顶点的位置
       gl.glVertexPointer(3, GL10.GL_FLOAT, 0, triangleDataBuffer);
       // 设置顶点颜色数据
       gl.glColorPointer(4, GL10.GL_FIXED, 0, triangleColorBuffer);

       // 根据顶点数画图
       gl.glDrawArrays(GL10.GL_TRIANGLES, 0, 3);

       // 重置当前模型视图矩阵
       gl.glLoadIdentity();
       gl.glTranslatef(0.6f, 0.8f, -1.5f);
       gl.glRotatef(rotate, 0f, 0f, 0.1f);
       // 设置顶点的位置
       gl.glVertexPointer(3, GL10.GL_FLOAT, 0, rectDataBuffer);
       // 设置顶点颜色数据
       gl.glColorPointer(4, GL10.GL_FIXED, 0, rectColorBuffer);
       // 根据顶点数画图
       gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4);

       // 重置当前模型视图矩阵
       gl.glLoadIdentity();
       gl.glTranslatef(-0.4f, -0.5f, -1.5f);
       gl.glRotatef(rotate, 0f, 0.2f, 0f);
       // 设置顶点的位置
       gl.glVertexPointer(3, GL10.GL_FLOAT, 0, rectDataBuffer2);
       // 根据顶点数画图
       gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 4);

       // 重置当前模型视图矩阵
       gl.glLoadIdentity();
       gl.glTranslatef(0.4f, -0.5f, -1.5f);
       // 使用纯色填充
       gl.glColor4f(1.0f, 0.2f, 0.2f, 0.0f);
       gl.glDisableClientState(GL10.GL_COLOR_ARRAY);
       // 设置顶点的位置
       gl.glVertexPointer(3, GL10.GL_FLOAT, 0, pentacleBuffer);
       // 根据顶点数画图
       gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 5);
       // 绘制结束
       gl.glFinish();
       gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
       // 旋转度加1
       rotate += 1;
   }

}

public class RotateRPolygon extends Activity {
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       GLSurfaceView glView = new GLSurfaceView(this);
       MyRenderer myRender = new MyRenderer();
       glView.setRenderer(myRender);
       setContentView(glView);
   }
}

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