弹球程序

#include <stdio.h>

#define COL 64
#define ROW 20

#define BGCOLOR ' '
#define FGCOLOR '*'

#define X 10
#define Y 10
#define W 6
#define H 3

#define X_INC 1
#define Y_INC 1

static int color = 0;

void init(int *bg, int row, int col, char color);
void draw(int *bg, int row, int col,
          int x, int y, int w, int h, int color);
void move(int *x, int *y, int w, int h,
          int *x_inc, int *y_inc);
//void show(int *bg, int row, int col);

//void show(int (*arr)[COL], int row);
void show(int arr[][COL], int row);

int main(void)
{
    int background[ROW][COL];
    int x, y, w, h;
    int x_inc, y_inc;

    x = X;
    y = Y;
    w = W;
    h = H;
    x_inc = X_INC;
    y_inc = Y_INC;

    while (1)
    {
        init((int *)background, ROW, COL, BGCOLOR);
        draw((int *)background, ROW, COL,
             x, y, w, h, FGCOLOR);
        //show((int *)background, ROW, COL);
        show(background, ROW);
        move(&x, &y, w, h, &x_inc, &y_inc);

        usleep(100000);
    }

    return 0;
}

void init(int *bg, int row, int col, char color)
{
    int i, j;

    for (i = 0; i < row; ++i)
    {
        for (j = 0; j < col; ++j)
        {
            bg[i * col + j] = color;
        }
    }
}

void draw(int *bg, int row, int col,
          int x, int y, int w, int h, int color)
{
    int i, j;

    for (i = y; i < y + h; ++i)
    {
        for (j = x; j < x + w; ++j)
        {
            bg[i * col + j] = color;
        }
    }
}

void show(int bg[][COL], int row)
{
    int i, j;

    for (i = 0; i < row; ++i)
    {
        for (j = 0; j < COL; ++j)
        {
            if (*(bg[i] + j) == FGCOLOR)
            {
                printf("\033[3%dm%c\033[0m", color, *(bg[i] + j));
            }
            else
            {
                printf("%c", *(bg[i] + j));
            }
        }
    }
    fflush(stdout);
}

void move(int *x, int *y, int w, int h,
          int *x_inc, int *y_inc)
{
    if (*x + *x_inc < 0 || *x + w + *x_inc > COL)
    {
        color += 1;
        color %= 8;
        *x_inc = -(*x_inc);
    }
    if (*y + *y_inc < 0 || *y + h + *y_inc > ROW)
    {
        color += 1;
        color %= 8;
        *y_inc = -(*y_inc);
    }

    *x += *x_inc;
    *y += *y_inc;
}

基本思路：

1. 初始化二维数组BG 和 FG

2. 设置移动点 x 和 y  对移动点进行操作：

 （1） “+”法移动

 （2）如果“—”移动超过边界，并进行“—”操作， 就是对内存进行变化，一变到底