public class SquareRenderer extends AbstractRenderer
{
   //A raw native buffer to hold the point coordinates
   private FloatBuffer mFVertexBuffer;

   //A raw native buffer to hold indices
   //allowing a reuse of points.
   private ShortBuffer mIndexBuffer;
   private int numOfIndices = 0;
   private int sides = 4;

   public SquareRenderer(Context context)
   {
      prepareBuffers(sides);
   }
   private void prepareBuffers(int sides)
   {
      RegularPolygon t = new RegularPolygon(0,0,0,0.5f,sides);
      //RegularPolygon t = new RegularPolygon(1,1,0,1,sides);
      this.mFVertexBuffer = t.getVertexBuffer();
      this.mIndexBuffer = t.getIndexBuffer();
      this.numOfIndices = t.getNumberOfIndices();
      this.mFVertexBuffer.position(0);
      this.mIndexBuffer.position(0);
   }
   //overriden method
   protected void draw(GL10 gl)
   {
      prepareBuffers(sides);
      gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mFVertexBuffer);
      gl.glDrawElements(GL10.GL_TRIANGLES, this.numOfIndices,
      GL10.GL_UNSIGNED_SHORT, mIndexBuffer);
   }
}