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From: "Zenko B. Klapko Jr." <zen1 AT comcast DOT net>
Subject: Re: allegro and math libraries
Newsgroups: comp.os.msdos.djgpp
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Date: Sat, 12 Jan 2002 00:06:25 GMT
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hello A. Sinan!

Thank you for responding to my post! I'm really greatful for the help it
gave me a new persepctive on the problem. Heres a revised edition for the
propeller spinning line if you want one point stationary then comment out
xang2 and yang2. 

-Zen
#include <math.h>
#include <conio.h>
#include <iostream.h>
#include <allegro.h>

void linerotate();

int main()
{
allegro_init();
set_gfx_mode(GFX_VESA1,800,600,0,0);
linerotate();
return 0;
};
/******************************************************************/
void linerotate()
{  double rad,rad2,xang,yang,xpos=100,ypos=100,xpos2=100,ypos2=100,xang2,yang2;

for(int ang=0;ang<=360;ang++)
{
 rad=ang*(3.14/180);
 rad2=(ang+180)*(3.14/180);
 xang=25*cos(rad)-25*sin(rad);
 yang=25*sin(rad)+25*cos(rad);
 xang2=25*cos(rad2)-25*sin(rad2);
 yang2=25*sin(rad2)+25*cos(rad2);
 xpos+=xang2;
 ypos+=yang2;
 xpos2+=xang;
 ypos2+=yang;
 
line(screen,int(xpos),int(ypos),int(xpos2),int(ypos2),3);
 if(getch()=='q')
   ang=359;
 xpos=100; ypos=100; xpos2=100; ypos2=100;
}
clear(screen);
};