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  1. #include <gl/glut.h>
  2.  
  3. float X = 0;
  4. float Y = 0;
  5.  
  6. void display(void) {
  7.  
  8. 	glClear(GL_COLOR_BUFFER_BIT);
  9.  
  10. 	glBegin(GL_QUADS);
  11. 	glVertex2d(X-0.1,Y-0.1);
  12. 	glVertex2d(X-0.1,Y+0.1);
  13. 	glVertex2d(X+0.1,Y+0.1);
  14. 	glVertex2d(X+0.1,Y-0.1);
  15. 	if (X == 1.0 || X == -1.0) {//虚像
  16. 		glVertex2d(-X - 0.1, Y - 0.1);
  17. 		glVertex2d(-X - 0.1, Y + 0.1);
  18. 		glVertex2d(-X + 0.1, Y + 0.1);
  19. 		glVertex2d(-X + 0.1, Y - 0.1);
  20. 	}
  21. 	if (Y == 1.0 || Y == -1.0) {//虚像
  22. 		glVertex2d(X - 0.1,-Y - 0.1);
  23. 		glVertex2d(X - 0.1,-Y + 0.1);
  24. 		glVertex2d(X + 0.1,-Y + 0.1);
  25. 		glVertex2d(X + 0.1,-Y - 0.1);
  26. 	}
  27. 	glEnd();
  28.  
  29. 	glFlush();
  30.  
  31. }
  32. void keyboard(unsigned char key, int x, int y)
  33. {
  34. 	switch (key) {
  35. 	case 'a':
  36. 	case 127:
  37. 		X -= 0.2;
  38. 		break;
  39. 	case 'w':
  40. 	case 27:
  41. 		Y += 0.2;
  42. 		break;
  43. 	case 's':
  44. 	case' ':
  45. 		X += 0.2;
  46. 		break;
  47. 	case 'z':
  48. 	case 'E':
  49. 		Y -= 0.2;
  50. 		break;
  51.  
  52. 	default:
  53. 		break;
  54. 	}
  55. 	//入力補正
  56. 	if (X >  1.1)  X = -1;
  57. 	if (X < -1.1) X = 1;
  58. 	if (Y >  1.1)  Y = -1;
  59. 	if (Y < -1.1) Y = 1;
  60. 	//強制再描画
  61. 	glutPostRedisplay();
  62. }
  63.  
  64. int main(int argc, char *argv[])
  65. {
  66. 	glutInit(&argc, argv);
  67.  
  68. 	glutInitDisplayMode(GLUT_RGBA);
  69. 	glutInitWindowSize(640, 480);
  70. 	glutCreateWindow(argv[0]);
  71.  
  72. 	glutDisplayFunc(display);
  73. 	glutKeyboardFunc(keyboard);
  74.  
  75. 	glClearColor(0.0, 0.0, 1.0, 0.0);
  76.  
  77. 	glutMainLoop();
  78.  
  79. 	return 0;
  80. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.c:1:21: fatal error: gl/glut.h: No such file or directory
 #include <gl/glut.h>
                     ^
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/ux7k5i
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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