androidopengles球体坐标,AndroidOpenGL入门实例：绘制球体.docx

Android OpenGL入门实例&＃xff1a;绘制球体

相比曲线而言&＃xff0c;曲面的坐标计算要复杂许多。在其他OpenGL平台上&＃xff0c;绘制一个球体也就是一个GLU API 的事&＃xff0c;但是Android为上GLU被严重削减了&＃xff0c;总共不到10个API。不过我们可以很方便的将它们的源码拷贝过来。这里要说的是大家不必纠结于算法的实现(通过修改参数&＃xff0c;可以大致了解算法过程)&＃xff0c;在实际应用中&＃xff0c;都是通过3ds max建好模型然后导入到OpenGL中&＃xff0c;完全不必计算坐标值。

HYPERLINK "/archives/222" \l "viewSource" \o "view source" view source

HYPERLINK "/archives/222" \l "printSource" \o "print" print HYPERLINK "/archives/222" \l "about" \o "?" ?

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public class DrawSphere extends Activity implements GLSurfaceView.Renderer{

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Sphere mSphere;

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float xrot &＃61; 0.0f;

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float yrot &＃61; 0.0f;

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float perx &＃61; 0;

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float pery &＃61; 0;

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&＃64;Override

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public void onCreate(Bundle savedInstanceState) {

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super.onCreate(savedInstanceState);

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GLSurfaceView myView &＃61; new GLSurfaceView(this);

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myView.setRenderer(this);

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setContentView(myView);

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mSphere &＃61; new Sphere(40, 40, 2);

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// mSphere &＃61; new Sphere(6, 5, 2);

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// mSphere &＃61; new Sphere(12, 12, 2);

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}

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public void onDrawFrame(GL10 gl) {

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gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);

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gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

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gl.glLoadIdentity();

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GLU.gluLookAt(gl, 0, 0, 5, 0, 0, 0, 0, 1, 0);

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gl.glRotatef(xrot, 1, 0, 0);

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gl.glRotatef(yrot, 0, 1, 0);

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mSphere.draw(gl);

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}

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public void onSurfaceChanged(GL10 gl, int width, int height) {

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gl.glViewport(0, 0, width, height);

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gl.glMatrixMode(GL10.GL_PROJECTION);

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gl.glLoadIdentity();

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GLU.gluPerspective(gl, 45.0f, (float)width / (float)height, 0.1f, 100.0f);

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gl.glMatrixMode(GL10.GL_MODELVIEW);

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gl.glLoadIdentity();

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init(gl);

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}

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public void onSurfaceCreated(GL10 gl, EGLConfig config) {

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}

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&＃64;Override

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public boolean onTouchEvent(MotionEvent event){

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int action &＃61; event.getAction();

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float scalesize &＃61; 0.3f;

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switch(action){

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case MotionEvent.ACTION_DOWN:

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perx &＃61; event.getX();

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pery &＃61; event.getY();

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break;

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case MotionEvent.ACTION_MOVE:

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yrot