xcode - Opengl Triangle instead of square -

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im trying create spinning square inside of xcode using opengl instead reason have spinning triangle?

i'm doing inside of sio2 dont think problem.

here triangle: http://img220.imageshack.us/img220/7051/snapzproxscreensnapz001.png

here code:

void templaterender( void ) {     const glfloat squarevertices[] ={         100.0f, -100.0f,         100.0f, -100.0f,         -100.0f, 100.0f,         100.0f, 100.0f,      };      const unsigned char squarecolors[] = {         255, 255, 0, 255,         0, 255, 255, 255,         0, 0, 0, 0,         255, 0, 255, 255,     };       glmatrixmode( gl_modelview );     glloadidentity();      glclear( gl_depth_buffer_bit | gl_color_buffer_bit );      // rendering code here...      sio2windowenter2d( sio2->_sio2window, 0.0f, 1.0f );     {         glvertexpointer( 2, gl_float, 0, squarevertices );         glenableclientstate(gl_vertex_array);         //set color array         glcolorpointer( 4, gl_unsigned_byte, 0, squarecolors );         glenableclientstate( gl_color_array );          gltranslatef( sio2->_sio2window->scl->x * 0.5f,                      sio2->_sio2window->scl->y * 0.5f, 0.0f );          static float rotz = 0.0f;         glrotatef( rotz, 0.0f, 0.0f, 1.0f );         rotz += 90.0f * sio2->_sio2window->d_time;         gldrawarrays(gl_triangle_strip, 0, 4);     }     sio2windowleave2d();     }

two of points same. therefore have provided 3 unique points have triangle.

the point missing -100.0f, -100.0f,


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