Pendulum using c in graphics


Levels of difficulty: / perform operation:

C Program

#include<graphics.h> 
#include<conio.h> 
#include<dos.h> 
#include<process.h> 
int cx=300,cy=100,r=300;
int x=0,y,p;
int path(int dtn) {
	int x1,y1;
	setcolor(15);
	if(x>=y) {
		return 0;
	}
	cleardevice();
	if(dtn==1) {
		circle(cx+x,cy+y,20);
		line(cx,cy,cx+x,cy+y);
	} else {
		circle(cx-x,cy+y,20);
		line(cx,cy,cx-x,cy+y);
	}
	delay(10);
	if(kbhit()) 
	        exit(0);
	x++;
	if(p<0) 
	        p+=2*x+1; else {
		y--;
		p+=2*(x-y)+1;
	}
	x1=x;
	y1=y;
	path(dtn);
	cleardevice();
	if(dtn==1) {
		circle(cx+x1,cy+y1,20);
		line(cx,cy,cx+x1,cy+y1);
	} else {
		circle(cx-x1,cy+y1,20);
		line(cx,cy,cx-x1,cy+y1);
	}
	delay(10);
	if(kbhit()) 
	        exit(0);
	return(0);
}
void main() {
	int gd=DETECT,gm=DETECT;
	initgraph(&gd,&gm,"");
	cleardevice();
	putpixel(300,100,4);
	while(1) {
		x=0;
		y=r;
		p=1-r;
		path(1);
		x=0;
		y=r;
		p=1-r;
		path(0);
	}
}





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