程序运行后会在屏幕上用triplex_font显示“press any key for set off”，下方是用基本的线条画出的发射架（有点粗糙），即程序中的drawgun()函数，当按下任意键后，将在发射架上方出现一个用横线填充的飞机，同
时背景被繁星填充，此时必须按住任意键不放，否则飞机将不会发射。发射完成后，即飞机坐标小于0，将出现一句话："successfully!!!,press esc to quit",若中途按esc退出，则飞机y坐标不小于0，将出现"failue,..."这句话。
#include<graphics.h>
#include<conio.h>
#include<stdio.h>
#include<stdlib.h>
#include<alloc.h>
#define esc 0x1b/*esc的ascii码，十六进制*/
void installgraph(void);/*图形程序加载函数的说名语句*/
void drawgun(void); /*画发射架函数的说明语句*/
void drawplan(void); /*画飞机函数的说明语句*/
void drawstar(void); /*画星函数的说明语句*/
void *buf; /*全局变量，用于存储飞机的图像*/
int x0=300; /*以下是飞机的位置初始化参数*/
int y0=340;
int width1=5;
int width2=20;
int height=25;
int y1=8;
int y2=15;
int y3=23;
int y4=38;
/*主函数开始*/
main()
{
int size;
int i=0;
int key;
int station;
installgraph();
setbkcolor(black);
cleardevice();/*图形驱动程序和屏幕初始化工作完成*/
setcolor(blue);/*设置字的颜色*/
settextstyle(triplex_font,0,4);/*设置字体*/
outtextxy(80,100,"ready!...any key to set off !!!");
drawgun(); /*画出发射架*/
getch(); /*if press key,clear the words and start*/
cleardevice();
drawgun();
drawplan();
drawstar();
setcolor(lightred);/*define result words color*/
do{ /*程序主循环开始，用于运动飞机，方法是用异或的方式在屏幕上连续画出飞机 的图像，每画一次，新图像和来的位置相差两个像素点。
这个值是可调的，值越大，飞机飞行的速度越快*/
putimage(x0-width2,y0-height-3*width1-i,buf,xor_put);
i+=2;
putimage(x0-width2,y0-height-3*width1-i,buf,xor_put);
key=getch();
if(y0-height-3*width1-i==0)
outtextxy(60,100,"successfully!!! press esc to quit");
if(key==esc){
if(y0-height-3*width1-i>0){
cleardevice();
outtextxy(100,100,"failue. what did you do?");
outtextxy(130,300,"press any key to quit.");
getch();
}
}
}while(key!=esc);
free(buf);
closegraph();
return 0;
}
/*****************install the graphics library***********************/
void installgraph(void)
{
int grdriver=detect;
int grmode;
int errorcode;
char *errormsg;
registerbgidriver(egavga_driver);
registerbgifont(triplex_font);
initgraph(&grdriver,&grmode,"");
errorcode=graphresult();
errormsg=grapherrormsg(errorcode);
if(errorcode!=grok){
printf("graphics error: %s\n",errormsg);
printf("press any key to exit.\n");
getch();
exit(1);
}
}
/************************draw the star ********************************/
void drawstar(void)
{
int seed=2000;
int i,dotx,doty,height,width,color,maxcolor;
maxcolor=getmaxcolor();
width=getmaxx();
height=getmaxy();
srand(seed);
for(i=0;i<250;i++){
dotx=i+random(width-1);
doty=i+random(height-1);
color=random(maxcolor);
setcolor(color);
putpixel(dotx,doty,color);
circle(dotx+1,doty+1,1);
}
srand(seed);
}
/****************draw the bottom gun********************/
void drawgun(void)
{
int x0=300;
int y0=430;
int height=45;
int rx=20;
int ry=5;
int rightx,righty,leftx,lefty;
int centery1=30;
rightx=righty=leftx=lefty=12;
setcolor(lightgreen);
ellipse(x0,y0,180,360,rx,ry);
ellipse(x0,y0-height,0,360,rx,ry);
line(x0+rx,y0,x0+rx,y0-height);
line(x0-rx,y0,x0-rx,y0-height);
moveto(x0+rx,y0);
l.neto(x0+rx+rightx,y0+righty);
moveto(x0+rx+rightx,y0+righty);
l.neto(x0+rx+rightx+10,y0+righty+10);
circle(x0+rx+rightx+10,y0+righty+10,4);
moveto(x0,y0+ry);
l.neto(x0,y0+centery1);
moveto(x0,y0+centery1);
l.neto(x0,y0+centery1+10);
circle(x0,y0+centery1+10,4);
moveto(x0-rx,y0);
l.neto(x0-rx-leftx,y0+lefty);
moveto(x0-rx-leftx,y0+lefty);
l.neto(x0-rx-leftx-10,y0+lefty+10);
circle(x0-rx-leftx-10,y0+lefty+10,4);
line(x0-rx-leftx,y0+lefty,x0,y0+centery1);
line(x0,y0+centery1,x0+rx+rightx,y0+righty);
}
/*****************draw the plan fly to the sky***********************/
void drawplan(void)
{
int size;
setcolor(lightred);
setfillstyle(1,blue);
ellipse(x0,y0-height,0,180,width1,3*width1);
moveto(x0+width1,y0); /*moveto center right side*/
l.neto(x0+width1,y0-height);
moveto(x0+width1,y0);
l.neto(x0+width2,y0+y2);
moveto(x0-width1,y0); /*moveto center left side*/
l.neto(x0-width1,y0-height);
moveto(x0-width1,y0);
l.neto(x0-width2,y0+y2);
moveto(x0+width2,y0+y3);/*moveto right bottom side*/
l.neto(x0+width2,y0+y1);
moveto(x0+width2,y0+y3);
l.neto(x0+width1,y0+y2);
moveto(x0-width2,y0+y3);/*moveto left bottom side*/
l.neto(x0-width2,y0+y1);
moveto(x0-width2,y0+y3);
l.neto(x0-width1,y0+y2);
moveto(x0,y0+y4); /*moveto the bottomest*/
l.neto(x0+width1,y0+y2);
moveto(x0,y0+y4);
l.neto(x0-width1,y0+y2);
setfillstyle(2,lightred); /*fill the plan with a style */
floodfill(x0,y0,lightred);
size=imagesize(x0-width2-1,y0-height-3*width1,
x0+width2+1,y0+y4);
buf=malloc(size);
if(!buf){
printf("no enough memory!");
exit(0);
}
getimage(x0-width2,y0-height-3*width1,x0+width2,y0+y4,buf);
}
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