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1、643附录A实例程序A.1Sierpinski镂垫程序/*two-dimensionalSierpinskigasket*//*generatedusingrandomlyselectedvertices*//*andbisection*/#include/*youmayhavetochangetheincludetoorelsewheredependingonwhereitisstoredonyoursystem*//*glut.husuallyhasincludedforgl.handglu.h*/voidmyinit(void){
2、/*attributes*/glClearColor(1.0,1.0,1.0,1.0);/*whitebackground*/glColor3f(1.0,0.0,0.0);/*drawinred*//*setupviewing*//*50.0×50.0cameracoordinatewindowwithoriginlowerleft*/glMatrixMode(GL_PROJECTION);glLoadIdentity();gluOrtho2D(0.0,50.0,0.0,50.0);glMatrixMode(GL_MODELVIEW);}voiddisplay(void){
3、/*Atriangle*/GLfloatvertices[3][2]={{0.0,0.0},{25.0,50.0},{50.0,0.0}};inti,j,k;intrand();/*standardrandomnumbergenerator*/GLfloatp[2]={7.5,5.0};/*anarbitraryinitialpointinsidetraingle*/glClear(GL_COLOR_BUFFER_BIT);/*clearthewindow*/glBegin(GL_POINTS);/*computeandplots5000newpoints*/for(k=0
4、;k<5000;k++){j=rand()%3;/*pickavertexatrandom*//*Computepointhalfwaybetweenselectedvertexandoldpoint*/643附录A实例程序p[0]=(p[0]+vertices[j][0])/2.0;p[1]=(p[1]+vertices[j][1])/2.0;/*plotnewpoint*/glVertex2fv(p);}glEnd();glFlush();/*clearbuffers*/}voidmain(intargc,char**argv){/*StandardGLUTinitia
5、lization*/glutInit(&argc,argv);glutInitDisplayMode(GLUT_SINGLE
6、GLUT_RGB);/*default,notneeded*/glutInitWindowSize(500,500);/*500×500pixelwindow*/glutInitWindowPosition(0,0);/*placewindowtopleftondisplay*/glutCreateWindow("SierpinskiGasket");/*windowtitle*/glutDisplayFunc(display);/*displayc
7、allbackinvokedwhenwindowopened*/myinit();/*setattributes*/glutMainLoop();/*entereventloop*/}A.2生成Sierpinski镂垫的递归程序/*RecursivesubdivisionoftriangletoformSierpinskigasket*//*numberofrecursivestepsgivenoncommandline*/#include#include/*initialtriangle*/GLfloatv[3][2]={{-1.
8、0,-0.58},{1.0,-0.58},{0.0,1.15}};intn;voidtriangle(GLfloat*a,GLfloat*b,GLfloat*c)/*displayonetriangle*/{glVertex2fv(a);glVertex2fv(b);glVertex2fv(c);}643附录A实例程序voiddivide_triangle(GLfloat*a,GLfloat*b,GLfloat*c,intm){/*trianglesubdivisionusingvertexnumbers*/GLf
