text: //
  //  OpenGLES_Ch7_2ViewController.h
  //  OpenGLES_Ch7_2
  //
  
  #import <GLKit/GLKit.h>
  
  @interface OpenGLES_Ch7_2ViewController : GLKViewController
  
  - (IBAction)takeAngle0From:(UISlider *)sender;
  - (IBAction)takeAngle1From:(UISlider *)sender;  
  - (IBAction)takeAngle2From:(UISlider *)sender;  
  
  @end
  