[求助]关于“火箭发射”这个程序的修改问题
在网上能找到火箭发射的这个程序，如下：#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 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;
int grdriver=DETECT;
int grmode;
initgraph(&grdriver,&grmode,"");
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;
}
/************************Draw the star ********************************/
void DrawStar(void)
{
int i,dotx,doty,height,width,color,maxcolor;
maxcolor=getmaxcolor();
width=getmaxx();
height=getmaxy();
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);
}
}
/****************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);
lineto(x0+rx+rightx,y0+righty);
moveto(x0+rx+rightx,y0+righty);
lineto(x0+rx+rightx+10,y0+righty+10);
circle(x0+rx+rightx+10,y0+righty+10,4);
moveto(x0,y0+ry);
lineto(x0,y0+centery1);
moveto(x0,y0+centery1);
lineto(x0,y0+centery1+10);
circle(x0,y0+centery1+10,4);
moveto(x0-rx,y0);
lineto(x0-rx-leftx,y0+lefty);
moveto(x0-rx-leftx,y0+lefty);
lineto(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);
ellipse(x0,y0-height,0,180,width1,3*width1);
moveto(x0+width1,y0); /*moveto center right side*/
lineto(x0+width1,y0-height);
moveto(x0+width1,y0);
lineto(x0+width2,y0+y2);
moveto(x0-width1,y0); /*moveto center left side*/
lineto(x0-width1,y0-height);
moveto(x0-width1,y0);
lineto(x0-width2,y0+y2);
moveto(x0+width2,y0+y3);/*moveto right bottom side*/
lineto(x0+width2,y0+y1);
moveto(x0+width2,y0+y3);
lineto(x0+width1,y0+y2);
moveto(x0-width2,y0+y3);/*moveto left bottom side*/
lineto(x0-width2,y0+y1);
moveto(x0-width2,y0+y3);
lineto(x0-width1,y0+y2);
moveto(x0,y0+y4); /*moveto the bottomest*/
lineto(x0+width1,y0+y2);
moveto(x0,y0+y4);
lineto(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);
}
其中我用红字标出来的那段段，如何修改为按一下键后，火箭就会自动上升，而按ESC键就能退出？（原本是要手动按键，火箭才能上升）
我试着去掉了里面的getch()（我用蓝色标记出了），可是按ESC却无法退出。
望大侠指教～
