MySurface类

import java.io.IOException;import java.io.InputStream;import android.opengl.GLSurfaceView;import android.opengl.GLES20;import android.opengl.GLUtils;import android.view.MotionEvent;import javax.microedition.khronos.egl.EGLConfig;import javax.microedition.khronos.opengles.GL10;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;class MySurfaceView extends GLSurfaceView {    private final float TOUCH_SCALE_FACTOR = 180.0f/480;//角度缩放比例private float cameraX=0;//摄像机的位置private float cameraY=0;private float cameraZ=8;private float targetX=0;//看点private float targetY=-2;private float targetZ=-15;private float sightDis=30;//摄像机和目标的距离private float angdegElevation=45;//仰角private float angdegAzimuth=90;//方位角private float mPreviousY;//上次的触控位置Y坐标    private float mPreviousX;//上次的触控位置X坐标private SceneRenderer mRenderer;//场景渲染器    int textureId;      //系统分配的纹理id     boolean lightFlag=true;//光照旋转的标志位public MySurfaceView(Context context) {        super(context);        this.setEGLContextClientVersion(2); //设置使用OPENGL ES2.0        mRenderer = new SceneRenderer();//创建场景渲染器        setRenderer(mRenderer);//设置渲染器                setRenderMode(GLSurfaceView.RENDERMODE_CONTINUOUSLY);//设置渲染模式为主动渲染       }//触摸事件回调方法    @Override     public boolean onTouchEvent(MotionEvent e) {        float y = e.getY();        float x = e.getX();        switch (e.getAction()) {        case MotionEvent.ACTION_MOVE:            float dy = y - mPreviousY;//计算触控笔Y位移            float dx = x - mPreviousX;//计算触控笔X位移            angdegAzimuth += dx * TOUCH_SCALE_FACTOR;//设置沿y轴旋转角度            angdegElevation+= dy * TOUCH_SCALE_FACTOR;//设置沿x轴旋转角度                        //方位角            if(angdegAzimuth>=360){            angdegAzimuth=0;            }else if(angdegAzimuth<=0){            angdegAzimuth=360;            }            //仰角            if(angdegElevation>=85){            angdegElevation=85;            }else if(angdegElevation<=0){            angdegElevation=0;            }        }        mPreviousY = y;//记录触控笔位置        mPreviousX = x;//记录触控笔位置        return true;    }    private class SceneRenderer implements GLSurfaceView.Renderer     {   Building building;        public void onDrawFrame(GL10 gl)         {         //清除深度缓冲与颜色缓冲            GLES20.glClear( GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);                                     double angradElevation=Math.toRadians(angdegElevation);//仰角（弧度）        double angradAzimuth=Math.toRadians(angdegAzimuth);//方位角            cameraX=(float) (targetX+sightDis*Math.cos(angradElevation)*Math.cos(angradAzimuth));            cameraY=(float) (targetY+sightDis*Math.sin(angradElevation));            cameraZ=(float) (targetZ+sightDis*Math.cos(angradElevation)*Math.sin(angradAzimuth));                        MatrixState.setCamera(//设置camera位置             cameraX, //人眼位置的X            cameraY, //人眼位置的Y            cameraZ, //人眼位置的Z                        targetX, //人眼球看的点X            targetY, //人眼球看的点Y            targetZ, //人眼球看的点Z                        0,  //头的朝向            1,             0            );                        //保护现场            MatrixState.pushMatrix();            MatrixState.translate(0, 0, -15);        building.drawSelf(textureId);                        MatrixState.popMatrix();                    }           public void onSurfaceChanged(GL10 gl, int width, int height) {            //设置视窗大小及位置         GLES20.glViewport(0, 0, width, height);         //计算GLSurfaceView的宽高比            float ratio= (float) width / height;            //调用此方法计算产生透视投影矩阵            MatrixState.setProjectFrustum(-ratio, ratio, -1, 1, 4f, 100);//            //调用此方法产生摄像机9参数位置矩阵//            MatrixState.setCamera(0,0,8.0f,0f,0f,0f,0f,1.0f,0.0f);                     //初始化光源        MatrixState.setLightLocation(10 , 0 , -10);                              //启动一个线程定时修改灯光的位置        new Thread()        {public void run(){float redAngle = 0;while(lightFlag){//根据角度计算灯光的位置redAngle=(redAngle+5)%360;float rx=(float) (15*Math.sin(Math.toRadians(redAngle)));float rz=(float) (15*Math.cos(Math.toRadians(redAngle)));MatrixState.setLightLocation(rx, 0, rz);try {Thread.sleep(100);} catch (InterruptedException e) {  e.printStackTrace();}}}        }.start();        }        public void onSurfaceCreated(GL10 gl, EGLConfig config) {            //设置屏幕背景色RGBA            GLES20.glClearColor(0.0f,0.0f,0.0f, 1.0f);              //启用深度测试            GLES20.glEnable(GLES20.GL_DEPTH_TEST);    //设置为打开背面剪裁            GLES20.glEnable(GLES20.GL_CULL_FACE);            //初始化变换矩阵            MatrixState.setInitStack();                        //加载纹理            textureId=initTexture(R.drawable.white);                //创建对象            building=new Building(MySurfaceView.this,0.8f,8,8);                    }    }public int initTexture(int drawableId)//textureId{//生成纹理IDint[] textures = new int[1];GLES20.glGenTextures(1,          //产生的纹理id的数量textures,   //纹理id的数组0           //偏移量);    int textureId=textures[0];    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId);GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER,GLES20.GL_NEAREST);GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,GLES20.GL_TEXTURE_MAG_FILTER,GLES20.GL_LINEAR);GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S,GLES20.GL_CLAMP_TO_EDGE);GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T,GLES20.GL_CLAMP_TO_EDGE);                //通过输入流加载图片===============begin===================        InputStream is = this.getResources().openRawResource(drawableId);        Bitmap bitmapTmp;        try         {        bitmapTmp = BitmapFactory.decodeStream(is);        }         finally         {            try             {                is.close();            }             catch(IOException e)             {                e.printStackTrace();            }        }        //通过输入流加载图片===============end=====================                  //实际加载纹理        GLUtils.texImage2D        (        GLES20.GL_TEXTURE_2D,   //纹理类型，在OpenGL ES中必须为GL10.GL_TEXTURE_2D        0,   //纹理的层次，0表示基本图像层，可以理解为直接贴图        bitmapTmp,   //纹理图像        0  //纹理边框尺寸        );        bitmapTmp.recycle();   //纹理加载成功后释放图片                return textureId;}}