2.2.1 代码重构

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

//全局变量
int high, width;
int ball_x, ball_y;
int ball_vx, ball_vy;

//数据初始化
void startup() {
    high = 15;
    width = 20;
    ball_x = 0;
    ball_y = width / 2;
    ball_vx = 1;
    ball_vy = 1;
}

//清屏函数
void gotoxy(int x, int y) {
    HANDLE handle = GetStdHandle(STD_OUTPUT_HANDLE);
    COORD pos;
    pos.X = x;
    pos.Y = y;
    SetConsoleCursorPosition(handle, pos);
}

//消除光标
void HideCursor() {
    CONSOLE_CURSOR_INFO cursor_info = { 1,0 };//第二个值为0表示隐藏光标
    SetConsoleCursorInfo(GetStdHandle(STD_OUTPUT_HANDLE), &cursor_info);
}

//显示函数
void show() {
    gotoxy(0, 0);
    int i, j;
    for (int i = 0; i < high; i++) {
        for (int j = 0; j < width; j++) {
            if ((i == ball_x) && (j == ball_y))
                printf("O");
            else
                printf(" ");
        }
        printf("\n");
    }
}

//与用户输入无关的更新
void updateWithoutInput() {
    ball_x += ball_vx;
    ball_y += ball_vy;
    
    if ((ball_x == 0) || (ball_x == high - 1))
        ball_vx *= -1;
    if ((ball_y == 0) || (ball_y == width - 1))
        ball_vy *= -1;
    Sleep(50);
}

//与用户输入有关的更新
void updateWithInput() {

}

//主函数
int main() {
    HideCursor();
    startup();
    while (true) {
        show();
        updateWithoutInput();
        updateWithInput();
    }
    return 0;
}