?? gasket.c
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/* gasket.c */
/* E. Angel, Interactive Computer Graphics */
/* A Top-Down Approach with OpenGL, Third Edition */
/* Addison-Wesley Longman, 2003 */
/* Two-Dimensional Sierpinski Gasket *//* Generated Using Randomly Selected Vertices *//* And Bisection */#include <GL/glut.h>void myinit(void){ /* attributes */ glClearColor(1.0, 1.0, 1.0, 1.0); /* white background */ glColor3f(1.0, 0.0, 0.0); /* draw in red *//* set up viewing *//* 500 x 500 window with origin lower left */ glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0.0, 500.0, 0.0, 500.0); glMatrixMode(GL_MODELVIEW);}void display( void ){/* define a point data type */ typedef GLfloat point2[2]; point2 vertices[3]={{0.0,0.0},{250.0,500.0},{500.0,0.0}}; /* A triangle */ int i, j, k; int rand(); /* standard random number generator */ point2 p ={75.0,50.0}; /* An arbitrary initial point inside traingle */ glClear(GL_COLOR_BUFFER_BIT); /*clear the window *//* compute and plots 5000 new points */ for( k=0; k<5000; k++) { j=rand()%3; /* pick a vertex at random */ /* Compute point halfway between selected vertex and old point */ p[0] = (p[0]+vertices[j][0])/2.0; p[1] = (p[1]+vertices[j][1])/2.0; /* plot new point */ glBegin(GL_POINTS); glVertex2fv(p); glEnd(); } glFlush(); /* clear buffers */ }void main(int argc, char** argv){/* Standard GLUT initialization */ glutInit(&argc,argv); glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); /* default, not needed */ glutInitWindowSize(500,500); /* 500 x 500 pixel window */ glutInitWindowPosition(0,0); /* place window top left on display */ glutCreateWindow("Sierpinski Gasket"); /* window title */ glutDisplayFunc(display); /* display callback invoked when window opened */ myinit(); /* set attributes */ glutMainLoop(); /* enter event loop */}
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