package com.bn.Sample9_1;
import android.opengl.GLSurfaceView;
import android.opengl.GLES20;
import android.view.MotionEvent;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
import android.content.Context;
class MySurfaceView extends GLSurfaceView
{
private final float TOUCH_SCALE_FACTOR = 180.0f/320;//角度缩放比例
private SceneRenderer mRenderer;//场景渲染器
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
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
mRenderer.yAngle += dx * TOUCH_SCALE_FACTOR;//设置绕y轴旋转角度
mRenderer.xAngle+= dy * TOUCH_SCALE_FACTOR;//设置绕x轴旋转角度
requestRender();//重绘画面
}
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
{
float yAngle;//绕Y轴旋转的角度
float xAngle; //绕X轴旋转的角度
//从指定的obj文件中加载对象
LoadedObjectVertexOnly lovo;
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);
//坐标系推远
MatrixState.pushMatrix();
MatrixState.translate(0, -2f, -25f); //ch.obj
//绕Y轴、Z轴旋转
MatrixState.rotate(yAngle, 0, 1, 0);
MatrixState.rotate(xAngle, 1, 0, 0);
//若加载的物体不为空则绘制物体
if(lovo!=null)
{
lovo.drawSelf();
}
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, 2, 100);
//调用此方法产生摄像机9参数位置矩阵
MatrixState.setCamera(0,0,0,0f,0f,-1f,0f,1.0f,0.0f);
}
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);
//打开深度检测
GLES20.glEnable(GLES20.GL_DEPTH_TEST);
//打开背面剪裁
GLES20.glEnable(GLES20.GL_CULL_FACE);
//初始化变换矩阵
MatrixState.setInitStack();
//加载要绘制的物体
lovo=LoadUtil.loadFromFile("ch.obj", MySurfaceView.this.getResources(),MySurfaceView.this);
}
}
}