android 2D编程示例.docxVIP

TextDemoActivity.javapackage com.Android.TestDemo;import android.app.Activity;??import android.opengl.GLSurfaceView;??import android.os.Bundle;?public class TextDemoActivity extends Activity {? OpenGLRender render=new OpenGLRender(); public void onCreate(Bundle savedInstanceState) {?super.onCreate(savedInstanceState);?GLSurfaceView gview=new GLSurfaceView(this);?gview.setRenderer(render);?setContentView(gview); }??}??复制代码OpenGLRender.javapackage com.Android.TestDemo;import java.util.Random;import javax.microedition.khronos.egl.EGLConfig;??import javax.microedition.khronos.opengles.GL10;??import android.opengl.GLSurfaceView.Renderer;public class OpenGLRender implements Renderer { private float _width = 320f;?? private float _height = 480f;?? int? ? ? ?? ? data_index=0; private float[] data_line=new float[1000*2]; Random rnd=new Random(); OpenGLRender() { for(int i=0;i1000;i++) { data_line[i*2]=rnd.nextFloat()*2-1;//(float)Math.sin((float)data_index/10);// data_line[i*2+1]=(float)i/500-1; data_index=(data_index+1)%1000; }? } //@Override?? public void onSurfaceCreated(GL10 gl, EGLConfig config) { // 启用阴影平滑 gl.glShadeModel(GL10.GL_SMOOTH); // 黑色背景 gl.glClearColor(0, 0, 0, 0); gl.glEnable(GL10.GL_TEXTURE_2D); // 禁用深度测试 gl.glDisable(GL10.GL_DEPTH_TEST); //设置投影矩阵 gl.glMatrixMode(GL10.GL_PROJECTION); //重置投影矩阵 gl.glLoadIdentity(); gl.glOrthof(0,_width,0,_height, 0, 100); gl.glMatrixMode(GL10.GL_MODELVIEW); }? //@Override?? public void onSurfaceChanged(GL10 gl, int width, int height) {?_width = width;???_height=height;? // float ratio = (float) width / height; //设置OpenGL场景的大小 gl.glViewport(0, 0, width, height); //设置投影矩阵 gl.glMatrixMode(GL10.GL_PROJECTION); //重置投影矩阵 gl.glLoadIdentity();? }?? //@Override?? public void onDrawFrame(GL10 gl) {? // 清除屏幕和深度缓存 gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); // 重置当前的模型观察矩阵 gl.glLoadIdentity(); gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); gl.glColor4f(1.0f, 0.0f, 0.0f, 0.0f); gl.glLineWidthx(2); gl.glVertexPointer(2,