求一简单的C语言动画程序。

追问：大哥，这是简单的啊 ？ 能不能换个十几行的，还有注释什么的？ 麻烦你了，最好是网上没有的。谢谢了···

答案：#include <math.h> 
#include <stdio.h> 
#include <graphics.h> 
#include <dos.h> 

#define pi 3.1415926535 

double ca3mm1(double m1,double m2); 
double ca3fm1(double cosine,double sine); 
double ca5fm2(double a6m,double a5m,double a4m,double a4f,int shang); 
double ca6fm2(double a4m ,double a4f,double a5m , double a5f); 
char inbox(int x,int y,int x1,int y1); 
char buf(); 

main() 
{ 
double m=3.0; 
double xo=100.0,yo=200.0,a1=30.0,t1=pi; 
double xc=xo+m*a1,yc=yo; 
double a2=8.0,a3,a4=25.0,a5=30.0,a6=20.0,a7=35.0; 
double t2,t3,t4,t5,t6,t7; 
double xo1=xo+m*150,yo1=yo; 
double xc1=xo1-m*a1,yc1=yo1; 
double i,j,k; 
double l1; 
double n=116.1,nt; 
initscreen(); 

setfillstyle(SOLID_FILL,DARKGRAY); 
bar(0,0,640,480); 
mybutton(10,10,"BEGIN",1,0); 
mybutton(500,10,"EXIT",1,0); 
line(0,69,640,69); 
mouseinit(); 
changemousecross(); 
setmou易做图y(320,20); 
mouseshow(); 
setmousearea(0,0,640,60); 
do{ 
if(inbox(10,10,70,26)&&button()==1) 
{mousehide(); 
mybutton(10,10,"BEGIN",0,0); 
mouseshow(); 
mousehold(); 
mousehide(); 
mybutton(10,10,"BEGIN",1,7); 
mouseshow(); 
break; 
} 
if(inbox(500,10,555,26)&&button()==1) 
{mousehide(); 
mybutton(500,10,"EXIT",0,0); 
mouseshow(); 
mousehold(); 
mousehide(); 
mybutton(500,10,"EXIT",1,7); 
mouseshow(); 
exit(0); 
} 
if(buf()==56) 
for(i=0;i<10000;i++){ 
switch (buf()){ 
case 18:{ 
mousehide(); 
mybutton(500,10,"EXIT",0,0); 
mouseshow(); 
delay(4000); 
mousehide(); 
mybutton(500,10,"EXIT",1,7); 
mouseshow(); 
exit(0); 
} 
case 48: { 
mousehide(); 
mybutton(10,10,"BEGIN",0,0); 
mouseshow(); 
delay(4000); 
mousehide(); 
mybutton(10,10,"BEGIN",1,7); 
mouseshow(); 
goto run; 
} 
default:break; 
} 
} 
}while(1); 
run: 
drawjijia(xo,yo,1); 
drawjijia(xc,yc,1); 
drawjijia(xo1,yo1,1); 
drawjijia(xc1,yc1,1); 
setwritemode(1); 
do{ 
for(i=0;i<360.0;i+=1.0) 
{ 
t2=i; 
a3=ca3mm1(a1*cos(t1)+a2*cos(t2*pi/180.0),a1*sin(t1)+a2*sin(t2*pi/180.0)); 
t3=ca3fm1(a1*cos(t1)+a2*cos(t2*pi/180.0),a1*sin(t1)+a2*sin(t2*pi/180.0)); 
a4=a3; 
t4=t3; 
t5=ca5fm2(a6,a5,a4,t4,0); 
t6=ca6fm2(a4,t4,a5,t5); 
t7=t6-90.0; 
l1=xc1-xc-2*m*a7*cos(t7*pi/180); 
nt=(asin(l1/2/(n/2))*180/pi)-90.0; 
drawline(xo,yo,a2,t2,m,LIGHTGRAY); 
drawline(xo+m*a2*cos(t2*pi/180),yo-m*a2*sin(t2*pi/180),a5,t5,m,LIGHTGRAY); 
drawline(xc,yc,a6,t6,m,LIGHTGRAY); 
drawline(xc,yc,a7,t7,m,LIGHTGRAY); 
drawline1(xo1,yo1,a2,t2,m,LIGHTGRAY); 
drawline1(xo1+m*a2*cos((180-t2)*pi/180),yo1-m*a2*sin((180-t2)*pi/180),a5,t5,m,LIGHTGRAY); 
drawline1(xc1,yc1,a6,t6,m,LIGHTGRAY); 
drawline1(xc1,yc1,a7,t7,m,LIGHTGRAY); 
for(j=-1;j<20;j++) 
{ drawline(xc+m*a7*cos(t7*pi/180),(yc-m*a7*sin(t7*pi/180)-j*n*sin(nt*pi/180)),n,nt,1.0,GREEN); 
drawline1(xc1-m*a7*cos(t7*pi/180),(yc1-m*a7*sin(t7*pi/180)-j*n*sin(nt*pi/180)),n,nt,1.0,DARKGRAY); 
} 
delay(300); 
drawline(xo,yo,a2,t2,m,LIGHTGRAY); 
drawline(xo+m*a2*cos(t2*pi/180.0),yo-m*a2*sin(t2*pi/180.0),a5,t5,m,LIGHTGRAY); 
drawline(xc,yc,a6,t6,m,LIGHTGRAY); 
drawline(xc,yc,a7,t7,m,LIGHTGRAY); 
drawline1(xo1,yo1,a2,t2,m,LIGHTGRAY); 
drawline1(xo1+m*a2*cos((180-t2)*pi/180),yo1-m*a2*sin((180-t2)*pi/180),a5,t5,m,LIGHTGRAY); 
drawline1(xc1,yc1,a6,t6,m,LIGHTGRAY); 
drawline1(xc1,yc1,a7,t7,m,LIGHTGRAY); 
for(j=-1;j<20;j++) 
{ drawline(xc+m*a7*cos(t7*pi/180),(yc-m*a7*sin(t7*pi/180)-j*n*sin(nt*pi/180)),n,nt,1.0,GREEN); 
drawline1(xc1-m*a7*cos(t7*pi/180),(yc1-m*a7*sin(t7*pi/180)-j*n*sin(nt*pi/180)),n,nt,1.0,DARKGRAY); 
} 
setwritemode(0); 
if(inbox(500,10,555,26)&&button()==1) 
{mousehide(); 
mybutton(500,10,"EXIT",0,0); 
mouseshow(); 
mousehold(); 
mousehide(); 
mybutton(500,10,"EXIT",1,7); 
mouseshow(); 
exit(0); 
} 
if(buf()==56) 
for(k=0;k<10000;k++){ 
switch (buf()){ 
case 18:{ 
mousehide(); 
mybutton(500,10,"EXIT",0,0); 
mouseshow(); 
delay(4000); 
mousehide(); 
mybutton(500,10,"EXIT",1,7); 
mouseshow(); 
exit(0); } 
default:break; 
} 
} 
setwritemode(1); 
} 
}while(1); 
} 

drawline(double xo,double yo,double mo,double fujiao,double m,int color) 
{ 
double x,y; 
x=(xo+m*mo*cos(fujiao*pi/180)); 
y=(yo-m*mo*sin(fujiao*pi/180)); 
setcolor(color); 
line (xo,yo,x,y); 
} 
drawline1(double xo,double yo,double mo,double fujiao,double m,int color) 
{ 
double x,y; 
x=(xo-m*mo*cos(fujiao*pi/180)); 
y=(yo-m*mo*sin(fujiao*pi/180)); 
setcolor(color); 
line (xo,yo,x,y); 
} 
drawjijia(double x,double y,int shang) 
{ 
setcolor(RED); 
if (shang==1){ 
circle(x,y,3); 
line(x-3.0,y+3.0,x-15.0,y+20.0); 
moveto(x-15,(int)(y+20)); 
lineto((int)(x+15),(int)(y+20)); 
moveto((int)(x+15),(int)(y+20)); 
lineto(x+3,y+3);} 
setcolor(RED); 
if (shang==0){ 
circle((int)x,(int)y,3); 
line (x-3,y-3,x-15,y-20); 
moveto(x-15,y-20); 
lineto(x+15,y-20); 
moveto(x+15,y-20); 
lineto(x+3,y-3); 
} 
} 
double ca3mm1(double m1,double m2) 
{ 
double temp; 
temp = sqrt(m1*m1 + m2*m2); 
return(temp); 
} 
double ca3fm1(double cosine,double sine) 
{ 
float temp; 
if (sine > 0 && cosine > 0) 
temp = atan(sine / cosine) * 180 / pi; 
if (sine > 0 && cosine < 0) 
temp = (atan(sine / cosine) + pi) * 180 / pi; 
if (sine < 0 && cosine < 0) 
temp = (atan(sine / cosine) + pi) * 180 / pi; 
if (sine < 0 && cosine > 0) 
temp = (atan(sine / cosine) + 2 * pi) * 180 / pi; 
return(temp); 
} 
double ca5fm2(double a6m,double a5m,double a4m,double a4f,int shang) 
{ 
double temp,sine1,cosine1; 
cosine1 = (a6m *a6m - a4m *a4m - a5m*a5m) / (2 * a4m * a5m); 
sine1 = sqrt(1 - cosine1 *cosine1); 
if (shang==0) 
sine1 = sine1*(-1); 
if (sine1 > 0 && cosine1 > 0) 
temp = a4f + (atan(sine1 / cosine1) * 180 / pi); 
if (sine1 > 0 && cosine1 < 0) 
temp = a4f + ((atan(sine1 / cosine1) + pi) * 180 / pi); 
if (sine1 < 0 && cosine1 < 0) 
temp = a4f + ((atan(sine1 / cosine1) + pi) * 180 / pi); 
if (sine1 < 0 && cosine1 > 0) 
temp = a4f + ((atan(sine1 / cosine1) + 2 * pi) * 180 / pi); 
return(temp); 
} 
double ca6fm2(double a4m ,double a4f,double a5m , double a5f) 
{ 
double temp,sine1,cosine1; 
sine1 = a4m * sin(a4f * pi / 180) + a5m * sin(a5f * pi / 180); 
cosine1 = a4m * cos(a4f * pi / 180) + a5m * cos(a5f * pi / 180); 

if (sine1 > 0 && cosine1 > 0) 
temp = (atan(sine1 / cosine1) * 180 / pi); 
if (sine1 > 0 && cosine1 < 0) 
temp = ((atan(sine1 / cosine1) + pi) * 180 / pi); 
if (sine1 < 0 && cosine1 < 0) 
temp = ((atan(sine1 / cosine1) + pi) * 180 / pi); 
if (sine1 < 0 && cosine1 > 0) 
temp = ((atan(sine1 / cosine1) + 2 * pi) * 180 / pi); 
return(temp); 
} 
initscreen() 
{ 
int gd=DETECT,gm; 
registerbgidriver(EGAVGA_driver); 
initgraph(&gd,&gm,""); 
}

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