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/*
Author: Shahab Faruqi
Dated: 17 September 2001
Description: This program calculates sine, cosine and tangent waveforms.
You can adjust the frequency and amplitude of the waves by
changing the 2 arguments to sinewave(), cosinewave() and
tanwave() functions.
NOTE: Your graphics library must be installed. All *.bgi and
*.chr files must be located in the c:\tc\bgi directory. If
they are situated elsewhere change the location in the
initgraph() function.
Copyright: Public Domain
*/
#include<math.h>
#include<stdlib.h>
#include<graphics.h>
#include<conio.h>
double x=0,sinx,cosx,tanx,multi;
int ay,ax,newx=0,ox,oy,maxx,maxy,midy;
void sinewave(int,int);
void cosinewave(int,int);
void tanwave(int,int);
int distance(double,double);
int distance_tan(double,double);
void sinewave(int xmult,int ymult)
{
x=0;
newx=0;
ox=oy=0;
maxx=getmaxx();
midy=getmaxy()/2;
while(newx<maxx)
{
while(1)
{
if(x>3.142)
break;
sinx=sin(x);
multi=sinx*ymult;
ay=multi;
ax=newx+x*xmult;
moveto(ox,midy-oy);
lineto(ax,midy-ay);
x+=0.01;
ox=ax;
oy=ay;
}
newx=ax;
x=0;
while(1)
{
if(x>3.142)
break;
sinx=sin(x);
multi=sinx*ymult;
ay=multi;
ax=newx+x*xmult;
moveto(ox,midy+oy);
lineto(ax,midy+ay);
x+=0.01;
ox=ax;
oy=ay;
}
newx=ax;
x=0;
}
}
void cosinewave(int xmult,int ymult)
{
x=0;
newx=0;
ox=oy=0;
maxx=getmaxx();
midy=getmaxy()/2;
while(newx<maxx)
{
while(1)
{
if(x>3.14000)
break;
cosx=cos(x);
multi=cosx*ymult;
ay=multi;
ax=newx+x*xmult;
moveto(ox,midy-oy);
if(distance(ax,midy-ay)==0)
lineto(ax,midy-ay);
x+=0.01;
ox=ax;
oy=ay;
}
newx=ax;
x=0;
while(1)
{
if(x>3.1420)
break;
cosx=cos(x);
multi=cosx*ymult;
ay=multi;
ax=newx+x*xmult;
moveto(ox,midy+oy);
if(distance(ax,midy+ay)==0)
lineto(ax,midy+ay);
x+=0.01;
ox=ax;
oy=ay;
}
newx=ax;
x=0;
}
}
void tanwave(int xmult,int ymult)
{
x=0;
newx=0;
ox=oy=0;
maxx=getmaxx();
midy=getmaxy()/2;
while(newx<maxx)
{
while(1)
{
if(x>3.14000)
break;
tanx=tan(x);
multi=tanx*ymult;
ay=multi;
ax=newx+x*xmult;
moveto(ox,midy-oy);
if(distance_tan(ax,midy-ay)==0)
lineto(ax,midy-ay);
x+=0.01;
ox=ax;
oy=ay;
}
newx=ax;
x=0;
while(1)
{
if(x>3.1420)
break;
tanx=tan(x);
multi=tanx*ymult;
ay=multi;
ax=newx+x*xmult;
moveto(ox,midy+oy);
if(distance_tan(ax,midy+ay)==0)
lineto(ax,midy+ay);
x+=0.01;
ox=ax;
oy=ay;
}
newx=ax;
x=0;
}
}
int distance(double x,double y)
{
int xx=getx(),yy=gety();
double r;
x-=xx;
y-=yy;
x*=x;
y*=y;
r=sqrt(x+y);
if(r>1.0)return 1;
else return 0;
}
int distance_tan(double x,double y)
{
int xx=getx(),yy=gety();
double r;
x-=xx;
y-=yy;
x*=x;
y*=y;
r=sqrt(x+y);
if(r>100.0)return 1;
else return 0;
}
void main()
{
int a=DETECT,b;
initgraph(&a,&b,"c:\\tc\\bgi");
setlinestyle(0,0,1);
setcolor(14);
line(1,0,1,getmaxy());
line(1,getmaxy()/2,getmaxx(),getmaxy()/2);
sinewave(30,100);/*Change the arguments to change the frequency and
amplitude of the wave respectively*/
getch();
cleardevice();
line(1,0,1,getmaxy());
line(1,getmaxy()/2,getmaxx(),getmaxy()/2);
cosinewave(30,100);/*Change the arguments to change the frequency and
amplitude of the wave respectively*/
getch();
cleardevice();
line(1,0,1,getmaxy());
line(1,getmaxy()/2,getmaxx(),getmaxy()/2);
tanwave(30,100);/*Change the arguments to change the frequency and
amplitude of the wave respectively*/
getch();
closegraph();
}