Code Rain

       Code rain consists of N columns of "code", each column of "code" is composed of M codes, each "code" is regarded as an object, it has four properties, namely: x-coordinate, y-coordinate, speed, content. The speed of each column is different from the initial position to make a sense of staggering, but the speed of each "code" in each column is the same.

#include <bits/stdc++.h>
#include <Windows.h>

typedef struct{
	int x, y;
	char ch;
}RAINDROP;
 
const int BUFFER_SIZE = 50;
int WIDTH = 80;
int HEIGHT = 30;
const int RAIN_LENGTH = 18;
 
RAINDROP raindropLine[BUFFER_SIZE]; 
HANDLE HOUT = GetStdHandle(STD_OUTPUT_HANDLE);
void gotoxy(int x, int y){
	COORD pos;	
	pos.X = x;
	pos.Y = y;
	SetConsoleCursorPosition(HOUT, pos);
}
 
void show_cursor(BOOL hide){
	CONSOLE_CURSOR_INFO cciCursor;
	if (GetConsoleCursorInfo(HOUT, &cciCursor))
	{
		cciCursor.bVisible = hide;				
		SetConsoleCursorInfo(HOUT, &cciCursor);	
	}
}
 
void set_color(int color){
	SetConsoleTextAttribute(HOUT, color);		
}
 
int main(){
	CONSOLE_SCREEN_BUFFER_INFO info;
	GetConsoleScreenBufferInfo(HOUT, &info);	
	HEIGHT = info.srWindow.Bottom;			
	WIDTH = info.srWindow.Right;
	
	show_cursor(FALSE);
	srand((unsigned int)time(NULL));
	for (int i=0; i<BUFFER_SIZE; i++){
		raindropLine[i].x = rand()%WIDTH;
		raindropLine[i].y = rand()%HEIGHT;
		raindropLine[i].ch = ' '+i+rand() %2;		
	}
	
	while(true){
		GetConsoleScreenBufferInfo(HOUT, &info);	
		HEIGHT = info.srWindow.Bottom;
		WIDTH = info.srWindow.Right;
		for (int i=0; i<BUFFER_SIZE; ++i)
		{
			if (raindropLine[i].y <= HEIGHT)
			{
				gotoxy(raindropLine[i].x, raindropLine[i].y);
				set_color(FOREGROUND_GREEN);	
				putchar(raindropLine[i].ch);
			}
			gotoxy(raindropLine[i].x, raindropLine[i].y - RAIN_LENGTH);
			putchar(' ');
			raindropLine[i].y++;
			raindropLine[i].ch = ' '+i+rand() %2;
			if (raindropLine[i].y > HEIGHT + RAIN_LENGTH)		
			{
				raindropLine[i].x = rand() % WIDTH;
				raindropLine[i].y = rand() % HEIGHT;
			}
			if ( raindropLine[i].y <= HEIGHT)
			{
				gotoxy(raindropLine[i].x, raindropLine[i].y);
				set_color(FOREGROUND_GREEN|FOREGROUND_INTENSITY);	
				putchar(raindropLine[i].ch);
			}
		}
		Sleep(30);
	}
	getchar();
	return 0;
}