8.Pendulum(Animation).cpp

#include <GL/glut.h> #include <bits/stdc++.h> using namespace std; float angle=135; float inc=1.0; void initialize() {  glClearColor(1.0,1.0,1.0,0.0);  glClear(GL_COLOR_BUFFER_BIT);  glMatrixMode(GL_PROJECTION);  glLoadIdentity();  gluOrtho2D(-250,250,-250,250); } void midPoint(int x,int y,int r) {  int x1=0,y1=r;  float dp=1-r;  while(x1<=y1) { if(dp<=0) {      x1++;      dp+=(2*x1)+1;    }    else {      x1++;      y1--;      dp+=2*(x1-y1)+1;    }    glBegin(GL_POINTS);    glVertex2f(x1+x,y1+y);    glVertex2f(x1+x,y-y1);    glVertex2f(x-x1,y1+y);    glVertex2f(x-x1,y-y1);    glVertex2f(x+y1,y+x1);    glVertex2f(x+y1,y-x1);    glVertex2f(x-y1,y+x1);    glVertex2f(x-y1,y-x1);    glEnd();  }  glFlush(); } void delay(long long n) {  while(n>0) {    n--;  } } void display() {    glClear(GL_COLOR_BUFFER_BIT);    glColor3f(1.0,0.0,0.0); char ch;    glRasterPos2f(-70,220);    char msg[]={"Pendulum Clock"}; glClear(GL_COLOR_BUFFER_BIT); glColor3f(0.5,0.0,0.0); for(int i=0;msg[i]!='\0';++i) glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,msg[i]); glRasterPos2f(-5,175); ch='1'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch); glRasterPos2f(3,175); ch='2'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch); glRasterPos2f(50,155); ch='1'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch);
glRasterPos2f(70,130); ch='2'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch); glRasterPos2f(75,90); ch='3'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch); glRasterPos2f(70,55); ch='4'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch); glRasterPos2f(40,30); ch='5'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch); glRasterPos2f(-5,15); ch='6'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch); glRasterPos2f(-45,30); ch='7'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch); glRasterPos2f(-75,55); ch='8'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch); glRasterPos2f(-85,90); ch='9'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch); glRasterPos2f(-80,130); ch='1'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch); glRasterPos2f(-70,130); ch='0'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch); glRasterPos2f(-50,155); ch='1'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch); glRasterPos2f(-40,155); ch='1'; glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,ch); glColor3f(0.5,0.0,0.0);    midPoint(0,100,100); midPoint(0,100,60); if(angle>225) { angle=225;        inc=-inc; } if(angle<135) {        angle=135;        inc=-inc; } angle+=inc; double radian=angle*3.14/180; float y2=150*cos((double) radian); float x2=150*sin((double) radian); midPoint(x2,y2,30); glColor3f(0.0,0.0,0.0); glLineWidth(2); glBegin(GL_LINES); glVertex2f(0,0); glVertex2f(x2,y2); glVertex2f(0,100); glVertex2f(0,150); glVertex2f(0,100); glVertex2f(60,145); glEnd(); glFlush(); delay(7000000);
glutPostRedisplay();
} void keyboard(unsigned char key,int x,int y) { if(key==27)    exit(0); } int main(int argc,char **argv) { glutInit(&argc,argv); glutInitWindowSize(500, 500); glutInitWindowPosition(0, 0); glutCreateWindow("Pendulum Clock"); initialize(); glutDisplayFunc(display); glutKeyboardFunc(keyboard); glutMainLoop(); return 0; }