C语言 落雨字符，变色。

// CharacterRain.c


#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <windows.h>

int state[26];
int sleep = 100;//[100到1000]之间
int fcolor = 1;
int bcolor = BACKGROUND_GREEN;
int x1 = 10, y1 = 1, x2 = 10 + 26 + 2, y2 = 1 + 20;


void GotoXY(int x, int y)    //将光标移动到（x,y）位置
{
	HANDLE handle = GetStdHandle(STD_OUTPUT_HANDLE);    //获取标准输出设备句柄
	COORD pos = { x-1,y-1 };      //坐标位置
	SetConsoleCursorPosition(handle, pos);   //设置控制台光标位置
}

void HideCursor()
{
	CONSOLE_CURSOR_INFO cursor_info = { 1,0 };  //0表示隐藏光标
	SetConsoleCursorInfo(GetStdHandle(STD_OUTPUT_HANDLE), &cursor_info);
}


void DrawRectangle(int x, int y, int x2, int y2)
{
	int i;
	for (i = x; i <=x2; i = i + 2)
	{
		GotoXY(i, y);
		printf("■");
		GotoXY(i, y2);
		printf("■");
	}
	for (i = y; i < y2; i = i + 1)
	{
		GotoXY(x, i);
		printf("■");
		GotoXY(x2, i);
		printf("■");
	}
}
void Do() {
	HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);

	// 获取控制台屏幕缓冲区信息
	CONSOLE_SCREEN_BUFFER_INFO consoleInfo;
	if (GetConsoleScreenBufferInfo(hConsole, &consoleInfo))
	{
		// 设置控制台缓冲区大小
		COORD bufferSize = {
			consoleInfo.srWindow.Right - consoleInfo.srWindow.Left + 1,
			consoleInfo.srWindow.Bottom - consoleInfo.srWindow.Top + 1
		};
		SetConsoleScreenBufferSize(hConsole, bufferSize);

		// 设置文本属性
		SetConsoleTextAttribute(hConsole, bcolor | fcolor);

		// 清空屏幕并输出黄色的区域
		system("cls");
		for (int i = 0; i < bufferSize.Y; i++)
		{
			for (int j = 0; j < bufferSize.X; j++)
			{
				printf(" ");
			}
			printf("\n");
		}

		// 恢复原有文本属性
		SetConsoleTextAttribute(hConsole, consoleInfo.wAttributes);
	}
}
void change() {
	if (kbhit())
	{
		char ch = getch();
		if (ch == 'a') //改色
		{
			fcolor += 1;
			fcolor %= 4;
			if (!fcolor)
				fcolor = 1;
			SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), fcolor);
			
		}
		else if (ch == 'q') {
			exit(0);
		}
		else if (ch == 'b') {//减速
			sleep *= 2;
			sleep = sleep > 1000 ? 1000 : sleep;
		}
		else if (ch == 'c') {//加速
			sleep /= 2;
			sleep = sleep == 0 ? 100 : sleep;
		}
		else if (ch == 'd') {//背景色	
			fcolor = fcolor == BACKGROUND_GREEN ? BACKGROUND_BLUE : fcolor;
			Do();
			DrawRectangle(x1, y1, x2, y2);
			GotoXY(x1 + 2, y2 - 1);
			printf("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
		}
	}
}
 

int main()
{
	
	int i;
	char c;
	SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE),FOREGROUND_GREEN);
	system("mode con cols=80 lines=22");
	HideCursor(0);
	DrawRectangle(x1, y1, x2, y2);
	GotoXY(x1 + 2, y2 - 1);
	printf("ABCDEFGHIJKLMNOPQRSTUVWXYZ");	

	
	do
	{
		

		c = rand() % 26 + 'A';
		state[c - 'A'] = (state[c - 'A']==0?1:0);
		SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), fcolor + state[c - 'A']);

		for (i = y1 + 1; i < y2 - 1; i = i + 1)
		{
			change();
			GotoXY(x1 + c - 'A' + 2, i);
				printf("%c", c);
			Sleep(sleep);
			change();
			GotoXY(x1 + c - 'A' + 2, i);
			printf("");
		}
		GotoXY(x1 + c - 'A' + 2, i);
		printf("=");
		Sleep(200);
		GotoXY(x1 + c - 'A' + 2, i);
		printf("%c", c);
	} while (1);
	return 0;
}