c语言写的 下雨程序，使用了链表

#include <stdio.h> #include <stdlib.h> #include <conio.h> #include <time.h> #include <dos.h> #include <graphics.h> #define LEN sizeof(struct rainDrop) int rainDropNumber=60; int downSpeed=20; struct rainDrop *head; struct rainCircle { int x; int y; int r; int curR; int rainCircleStep; }; struct rainDrop { int startX; int startY; int endY; int curX; int curY; int rainColor; int rainLineStep; int rainLineLength; int status; struct rainCircle water; struct rainDrop *next; }; void initgraphics(void) { int gmode,gdriver; gdriver=DETECT; registerbgidriver(EGAVGA_driver); initgraph(&gdriver,&gmode,""); } struct rainDrop *creatDrop(void) { struct rainDrop *p; p=(struct rainDrop *)malloc(LEN); p->startX=rand()%640; p->startY=rand()%430; p->endY=430+rand()%50; p->curX=p->startX; p->curY=p->startY; p->rainLineStep=8; p->rainColor=rand()%15+1; p->rainLineLength=rand()%10+5; p->status=0; p->water.x=p->startX; p->water.y=p->endY; p->water.r=rand()%40; p->water.curR=rand()%2; p->water.rainCircleStep=rand()%2+1; p->next=NULL; return(p); } void recreatDrop(struct rainDrop *p) { p->startX=rand()%640; p->startY=rand()%430; p->endY=430+rand()%50; p->curX=p->startX; p->curY=p->startY; p->rainLineStep=8; p->rainColor=rand()%15+1; p->rainLineLength=rand()%10+5; p->status=0; p->water.x=p->startX; p->water.y=p->endY; p->water.r=rand()%40; p->water.curR=rand()%2; p->water.rainCircleStep=rand()%2+1; } void creatRain(void) { struct rainDrop *p1,*p2; int i; p1=p2=creatDrop(); head=p1; for(i=0;i<rainDropNumber;i++) { p2=creatDrop(); p1->next=p2; p1=p2; } } void updateRainLineData(struct rainDrop *p) { if(p->rainLineStep%5==0) p->rainLineStep++; p->curY+=p->rainLineStep; p->startY=p->curY-p->rainLineLength; } void drawRainLine(struct rainDrop *p) { setcolor(p->rainColor); line(p->startX,p->startY,p->curX,p->curY); } void clearRainLine(struct rainDrop *p) { setcolor(BLACK); line(p->startX,p->startY,p->curX,p->curY); } void rainDropDown(struct rainDrop *p) { if(p->curY>=p->endY) { clearRainLine(p); p->status=1; } else { clearRainLine(p); updateRainLineData(p); drawRainLine(p); } } void updateRainCircleData(struct rainDrop *p) { p->water.curR+=p->water.rainCircleStep; } void drawRainCircle(struct rainDrop *p) { setcolor(p->rainColor); circle(p->water.x,p->water.y,p->water.curR); } void clearRainCircle(struct rainDrop *p) { setcolor(BLACK); circle(p->water.x,p->water.y,p->water.curR); } void fallToWater(struct rainDrop *p) { if(p->water.curR>=p->water.r) { clearRainCircle(p); recreatDrop(p); } else { clearRainCircle(p); updateRainCircleData(p); drawRainCircle(p); } } void rain(void) { struct rainDrop *p; p=head; while(!kbhit()) { if(p==NULL) p=head; else { if(p->status==0) rainDropDown(p); else fallToWater(p); } delay(downSpeed); p=p->next; } } void clearAll(void) { struct rainDrop *p,*pf; p=head; while(p!=NULL) { pf=p; p=p->next; free(pf); } closegraph(); } main() { initgraphics(); printf("Input rainDrop Number:"); scanf("%d",&rainDropNumber); printf("Input down speed:"); scanf("%d",&downSpeed); randomize(); getch(); creatRain(); rain(); clearAll(); getch(); exit(0); }