//		 Gaurang Sinha
//	    gaurang85@rediffmail.com
//   gaurang.cjb.net -or- gaurang85.tripod.com
#include<stdio.h>
#include<conio.h>
#include<math.h>
#include<graphics.h>

#define ESC 0x1b
#define PI	3.14159265358979323846

void dwSin(float,float);
int s;

int main()
{
int gd=DETECT,gm;
float a,b;
A:
printf("\n\n Enter Wave Type :");
printf("\n 1. Sine Wave");
printf("\n 2. Cosine Wave");
printf("\n ::> ");
scanf("%d",&s);
if(s!=1&&s!=2)goto A;
printf("\n\nEnter Frequency & Amplitude : ");
scanf("%f%f",&a,&b);
initgraph(&gd,&gm,"C:\\TC\\BGI");
setbkcolor(BLACK);
setcolor(GREEN);	//Drawing Outer Border
line(1,1,1,469);
line(1,469,639,469);
line(639,469,639,1);
line(639,1,1,1);
setcolor(WHITE);	//Drawing Axis
line(0,240,640,240); 	//X Axis
line(320,0,320,469); 	//Y Axis
setcolor(RED);          //Sine Wave Color
dwSin(a,b);
getch();
return 0;
}

void dwSin(float freq,float amp)
{
int i;
long float var,val,tmp;
freq=freq*1.13;		//needs to be multiplied by 1.13 so that it'll fit on the screen
for(i=0;i<=720;i++)
{
	var=((i*PI)/180)*freq;	//Calculating radians ...
	if(s==1)
		val=amp*sin(var);       //Calculating corresponding sine/cosine value
	else if(s==2)
		val=amp*cos(var);
	val=(240-val);          //This is an constant added so that it'll draw sine wave on X-Axis
	putpixel(i,val,RED);	//Draws the corresponding pixel
}
}