Pourquoi mon appli testée OpenGL es android ne rend-elle rien en plus d'un écran rouge?

Question

Pour une raison quelconque, mon code ici (ceci est la chose entière) ne rend rien en plus d'un écran rouge .. quelqu'un peut-il me dire pourquoi?

package com.ntu.way2fungames.earth.testbed; 

import java.nio.FloatBuffer; 

import javax.microedition.khronos.egl.EGLConfig; 
import javax.microedition.khronos.opengles.GL10; 

import android.app.Activity; 
import android.content.Context; 
import android.opengl.GLSurfaceView; 
import android.opengl.GLSurfaceView.Renderer; 
import android.os.Bundle; 

public class projectiles extends Activity { 
    GLSurfaceView lGLView; 
    Renderer lGLRenderer; 
    float projectilesX[]= new float[5001]; 
    float projectilesY[]= new float[5001]; 
    float projectilesXa[]= new float[5001]; 
    float projectilesYa[]= new float[5001]; 
    float projectilesTheta[]= new float[5001]; 
    float projectilesSpeed[]= new float[5001]; 
    private static FloatBuffer drawBuffer; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     SetupProjectiles(); 

     Context mContext = this.getWindow().getContext(); 
     lGLView= new MyView(mContext); 
     lGLRenderer= new MyRenderer(); 
     lGLView.setRenderer(lGLRenderer); 
     setContentView(lGLView); 
    } 

    private void SetupProjectiles() { 
     int i=0; 
     for (i=5000;i>0;i=i-1){ 
      projectilesX[i] = 240; 
      projectilesY[i] = 427; 

      float theta = (float) ((i/5000)*Math.PI*2); 
      projectilesXa[i] = (float) Math.cos(theta); 
      projectilesYa[i] = (float) Math.sin(theta); 
      projectilesTheta[i]= theta; 
      projectilesSpeed[i]= (float) (Math.random()+1); 
     } 

    } 

    public class MyView extends GLSurfaceView{ 

     public MyView(Context context) { 
      super(context); 
      // TODO Auto-generated constructor stub 
     } 

    } 

    public class MyRenderer implements Renderer{ 

     private float[] projectilecords = new float[] { 
       .0f, .5f, 0, 
       -.5f, 0f, 0, 
       .5f, 0f, 0, 
       0, -5f, 0, 

     }; 


     @Override 
     public void onDrawFrame(GL10 gl) { 

      gl.glClear(GL10.GL_COLOR_BUFFER_BIT);     
      gl.glMatrixMode(GL10.GL_MODELVIEW); 
      //gl.glLoadIdentity(); 
      gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); 
      for (int i=5000;i>4500;i=i-1){ 

       //drawing section 
       gl.glLoadIdentity(); 
       gl.glColor4f(.9f, .9f,.9f,.9f); 
       gl.glTranslatef(projectilesY[i], projectilesX[i],1);  
       gl.glVertexPointer(3, GL10.GL_FLOAT, 0, drawBuffer); 
       gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, 12); 


       //physics section 
       projectilesX[i]=projectilesX[i]+projectilesXa[i]; 
       projectilesY[i]=projectilesY[i]+projectilesYa[i]; 


      } 
      gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); 
     } 

     @Override 
     public void onSurfaceChanged(GL10 gl, int width, int height) { 
      if (height == 0) height = 1; 
      // draw on the entire screen 
      gl.glViewport(0, 0, width, height); 
      // setup projection matrix 
      gl.glMatrixMode(GL10.GL_PROJECTION); 
      gl.glLoadIdentity(); 
      gl.glOrthof(0,width,height,0, -100, 100); 

     } 

     @Override 
     public void onSurfaceCreated(GL10 gl, EGLConfig arg1) { 
      gl.glShadeModel(GL10.GL_SMOOTH); 
      gl.glClearColor(1f, .01f, .01f, 1f); 

      gl.glClearDepthf(1.0f); 
      gl.glEnable(GL10.GL_DEPTH_TEST); 
      gl.glDepthFunc(GL10.GL_LEQUAL); 

      gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST); 

      drawBuffer = FloatBuffer.wrap(projectilecords);   
     } 


    } 
} 

Answer 1

se trouve que le code d'initialisation du projectile a été brisé

int i=0; 
     for (i=5000;i>0;i=i-1){ 
      projectilesX[i] = 240; 
      projectilesY[i] = 427; 

      float theta = (float) ((i/5000)*Math.PI*2); 
      projectilesXa[i] = (float) Math.cos(theta); 
      projectilesYa[i] = (float) Math.sin(theta); 
      projectilesTheta[i]= theta; 
      projectilesSpeed[i]= (float) (Math.random()+1); 
     } 

ne sais pas exactement pourquoi, mais quand je l'ai remplacé avec

int i=0; 
     float pi2=(float)(Math.PI *2); 
     for (i=5000;i>0;i=i-1){ 
      projectilesX[i] = 160; 
      projectilesY[i] = 320; 

      float theta = (float)(Math.random()); 
      projectilesSpeed[i]= (float) (Math.random()+1); 
      projectilesXa[i] = (float) Math.cos(theta*pi2)*projectilesSpeed[i]; 
      projectilesYa[i] = (float) Math.sin(theta*pi2)*projectilesSpeed[i]; 
      projectilesTheta[i]= (float) (theta*360); 

     } 

choses ont commencé à travailler ...