Computer Graphics

1
Computer Graphics

• CS 385
• February 14, 2005

2
3-dimensional gasket
3

• include ltstdlib.hgtinclude
  ltGL/glut.hgt/ define a point data type
  /typedef struct float x,y,z point

4

• include ltstdlib.h
• include ltGL/glut.hgt
• // define a point data type
• typedef struct float x,y,z point
• point vertices40,0,0,250,500,100,500,250,
  250,250,100,250
• // A tetrahedron
• int j
• point noo, old250,100,250

5

• include ltstdlib.h
• include ltGL/glut.hgt
• // define a point data type
• typedef struct float x,y,z point
• point vertices40,0,0,250,500,100,500,250,
  250,250,100,250
• // A tetrahedron
• int j
• point noo, old250,100,250
• void clear(void)
• glClear(GL_COLOR_BUFFER_BIT)

6

• include ltstdlib.h
• include ltGL/glut.hgt
• // define a point data type
• typedef struct float x,y,z point
• point vertices40,0,0,250,500,100,500,250,
  250,250,100,250
• // A tetrahedron
• int j
• point noo, old250,100,250
• void clear(void)
• glClear(GL_COLOR_BUFFER_BIT)
• void display(void)
• int rand()
• jrand()4 / pick a vertex at random /
• noo.x (old.xverticesj.x)/2
• noo.y (old.yverticesj.y)/2

7

• void mouse(int btn, int state, int x, int y)
• if(btnGLUT_LEFT_BUTTONstateGLUT_DOWN)
  glutIdleFunc(display)
• if(btnGLUT_MIDDLE_BUTTONstateGLUT_DOWN)
  glutIdleFunc(NULL)
• if(btnGLUT_RIGHT_BUTTONstateGLUT_DOWN)
  exit(0)

8

• void mouse(int btn, int state, int x, int y)
• if(btnGLUT_LEFT_BUTTONstateGLUT_DOWN)
  glutIdleFunc(display)
• if(btnGLUT_MIDDLE_BUTTONstateGLUT_DOWN)
  glutIdleFunc(NULL)
• if(btnGLUT_RIGHT_BUTTONstateGLUT_DOWN)
  exit(0)
• int main(int argc, char argv)
• glutInit(argc,argv)
• glutInitDisplayMode (GLUT_SINGLE GLUT_RGB)
• glutInitWindowSize(500,500)
• glutInitWindowPosition(0,0)
• glutCreateWindow("Sierpinski Gasket")
• glutIdleFunc (display)
• glutMouseFunc (mouse)
• glClearColor(.80, .80, .80, .80 ) / white
  background /
• glColor3f(1.0, 0.0, 0.0)