/*-----------------------------------
    fields.c -- 定义并使用字段
-----------------------------------*/

#include <stdio.h>

//线的样式
#define SOLID    0
#define DOTTED    1
#define DASHED    2

//三原色
#define BLUE    4
#define GREEN    2
#define RED        1

//混合色
#define BLACK    (BLUE & GREEN & RED)
#define YELLOW    (RED | GREEN)
#define MAGENTA    (RED | BLUE)
#define CYAN    (GREEN | BLUE)
#define WHITE    (RED | GREEN | BLUE)

const char *colors[] =
{
    "black", "red", "green", "yellow", "blue", "magenta", "cyan", "white"
};

struct box_props
{
    unsigned int opaque : 1;
    unsigned int fill_color : 3;
    unsigned int : 4;
    unsigned int show_border : 1;
    unsigned int border_color : 3;
    unsigned int border_style : 2;
    unsigned int : 2;
};

void show_settings(const struct box_props *pb);

int main()
{
    //创建并初始化 box_props 结构
    struct box_props box = {true, YELLOW, true, GREEN, DASHED};

    printf("Original box settings:\n");
    show_settings(&box);

    box.opaque = false;
    box.fill_color = WHITE;
    box.border_color = MAGENTA;
    box.border_style = SOLID;

    printf("\nModified box settings:\n");
    show_settings(&box);

    return 0;
}

void show_settings(const struct box_props *pb)
{
    printf("Box is %s.\n", pb->opaque ? "opaque" : "transparent");

    printf("The fill color is %s.\n", colors[pb->fill_color]);

    printf("Border %s.\n", pb->show_border ? "shown" : "not shown");

    printf("The border color is %s.\n", colors[pb->border_color]);

    printf("The border style is ");
    switch (pb->border_style)
    {
    case SOLID:
        printf("solid.\n");
        break;

    case DOTTED:
        printf("dotted.\n");
        break;

    case DASHED:
        printf("dashed.\n");
        break;

    default:
        printf("unknown type.\n");
        break;
    }
}