打印圖形

char g_print_array[20][20] = {{0}};

struct my_point
{
    int i;
    int j;
};

- (int)print_array_init:(char)c
{
    int i = 0;
    int j = 0;
    for (i = 0; i < 20; i++)
    {
        for (j = 0; j < 20; j++)
        {
            g_print_array[i][j] = c;
        }
    }
    return 0;
}
- (int)print_array_show
{
    int i = 0;
    int j = 0;
    for (i = 0; i < 20; i++)
    {
        for (j = 0; j < 20; j++)
        {
            printf("%c", g_print_array[i][j]);
        }
        printf("\n");
    }
    return 0;
}

- (int)print_array_assign_with:(struct my_point)point
{
    g_print_array[point.i][point.j] = '-';
    return 0;
}

- (int)print_point_to_point:(struct my_point)from to:(struct my_point)to
{
    int line_step = to.i - from.i;
    int col_step = to.j - from.j;
    int cur_line = from.i;
    int cur_col = from.j;
    if (line_step > 0)
    {
        line_step = 1;
    }
    else if (line_step < 0)
    {
        line_step = -1;
    }
    else
    {
        line_step = 0;
    }
    if (col_step > 0)
    {
        col_step = 1;
    }
    else if (col_step < 0)
    {
        col_step = -1;
    }
    else
    {
        col_step = 0;
    }
    for (int step = 0; step < 20; step++)
    {
        g_print_array[cur_line][cur_col] = '.';
        
        if (cur_line != to.i)
        {
            cur_line = cur_line + line_step;
        }
        
        if (cur_col != to.j)
        {
            cur_col = cur_col + col_step;
        }
        
        if ((cur_line == to.i)&&(cur_col == to.j))
            break;
        
    }
    
    return 0;
}

調用

    struct my_point from_point = {19,19};
    struct my_point to_point = {3,7};

    struct my_point next_from_point = {3,13};
    struct my_point next_to_point = {27,13};

    [self print_array_init:' '];
    [self print_point_to_point:from_point to:to_point];
    [self print_point_to_point:next_from_point to:next_to_point];
    //[self print_array_assign_with:point];
    [self print_array_show];