#include // use proper includes for your system#include #include gl.h>#include glut.h>const int screenHeight = 480;class GLintPoint{public: GLint x,y; };static GLintPoint conners[3];int random(int m){ return( rand()%m);}void drawDot(GLint x,GLint y){ //draw dot at integer point(x,y) glColor3f(1.0,0.0,0.0); glBegin(GL_POINTS); glVertex2i(x,y); glEnd();}

void Sierpinski(GLintPoint T[3]){ //GLintPoint T[3] = {{10,10},{300,30},{200,300}}; int index = random(3); GLintPoint point = T[index]; glClear(GL_COLOR_BUFFER_BIT); // clear the screen drawDot(point.x,point.y); for(int i = 0 ; i <1000 ; i++) { index = random(3); point.x=(point.x+T[index].x)/2; point.y=(point.y+T[index].y)/2; drawDot(point.x,point.y); } glFlush();}void myMouse(int button,int state,int x,int y){ glFlush(); static int numConners=0; if(button==GLUT_LEFT_BUTTON && state == GLUT_DOWN) { conners[numConners].x=x; conners[numConners].y=screenHeight-y; if(++numConners==3) { numConners=0; } }} void myKeyboard(unsigned char key, int mouseX, int mouseY){ if (key == 13) { Sierpinski(conners); } } //<<<<<<<<<<<<<<<<<<<<<<
>>>>>>>>>>>>>>>>>>> void myInit(void) { glClearColor(1.0,1.0,1.0,0.0); // background color is white glColor3f(0.0f, 0.0f, 0.0f); // drawing color is black glPointSize(2.0); // a ‘dot’ is 2 by 2 pixels glMatrixMode(GL_PROJECTION); // set “camera shape” glLoadIdentity(); gluOrtho2D(0.0,640.0, 0.0,480.0);}//<<<<<<<<<<<<<<<<<<<<<<<
>>>>>>>>>>>>>>>>void myDisplay(void){ glClear(GL_COLOR_BUFFER_BIT); // clear the screen // Sierpinski(); glFlush(); // send all output to display }//<<<<<<<<<<<<<<<<<<<<<<<
>>>>>>>>>>>>>>>>>>>>>void main(int argc, char** argv){ glutInit(&argc;, argv); // initialize the toolkit glutInitDisplayMode(GLUT_SINGLE GLUT_RGB); // set display mode glutInitWindowSize(640,480); // set window size glutInitWindowPosition(10,10); // set window position on screen glutCreateWindow(“Dot Plot of a Function”); // open the screen window glutDisplayFunc(myDisplay); // register redraw function glutMouseFunc(myMouse); glutKeyboardFunc(myKeyboard); myInit(); glutMainLoop(); // go into a perpetual loop}