[已解决]如何画圆？

qsy78

不用grace.h,如何画圆？

最佳答案

月排行榜 / 总排行榜

人造人

2021-10-14 22:04:28

在数学中怎么画圆，在编程中就怎么画圆

main.c

1. #include "screen.h"
   
2. #include <math.h>
   
3. 
   
4. void circle(screen_t *screen, size_t x, size_t y, size_t r) {
   
5.     for(double i = 0; i < 2 * M_PI; i += M_PI / 180) {
   
6.         screen_putchar(screen, x + (cos(i) * r) * 1.8, y + sin(i) * r, '0');
   
7.     }
   
8. }
   
9. 
   
10. int main(void) {
    
11.     screen_t *screen = screen_init(130, 41);
    
12.     screen_draw_border(screen, '#');
    
13.     circle(screen, screen->width / 2, screen->height / 2, 15);
    
14.     screen_refresh(screen, stdout);
    
15.     screen_deinit(screen);
    
16.     return 0;
    
17. }
    

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screen.h

1. #ifndef _SCREEN_H_
   
2. #define _SCREEN_H_
   
3. 
   
4. #include <stdio.h>
   
5. #include <stddef.h>
   
6. 
   
7. typedef struct {
   
8.     size_t width, height;
   
9.     char *buff;
   
10. } screen_t;
    
11. 
    
12. screen_t *screen_init(size_t width, size_t height);
    
13. void screen_deinit(screen_t *screen);
    
14. void screen_putchar(screen_t *screen, size_t x, size_t y, char ch);
    
15. void screen_refresh(screen_t *screen, FILE *fp);
    
16. void screen_draw_border(screen_t *screen, char ch);
    
17. 
    
18. #endif
    

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screen.c

1. #include "screen.h"
   
2. #include <stdlib.h>
   
3. #include <string.h>
   
4. 
   
5. screen_t *screen_init(size_t width, size_t height) {
   
6.     screen_t *screen = malloc(sizeof(*screen));
   
7.     *screen = (screen_t){width, height, malloc(width * height)};
   
8.     memset(screen->buff, ' ', screen->width * screen->height);
   
9.     return screen;
   
10. }
    
11. 
    
12. void screen_deinit(screen_t *screen) {
    
13.     free(screen->buff);
    
14.     free(screen);
    
15. }
    
16. 
    
17. void screen_putchar(screen_t *screen, size_t x, size_t y, char ch) {
    
18.     if(x < screen->width && y < screen->height)
    
19.         screen->buff[y * screen->width + x] = ch;
    
20. }
    
21. 
    
22. void screen_refresh(screen_t *screen, FILE *fp) {
    
23.     for(size_t y = 0; y < screen->height; ++y) {
    
24.         for(size_t x = 0; x < screen->width; ++x) {
    
25.             fputc(screen->buff[y * screen->width + x], fp);
    
26.         }
    
27.         fputc('\n', fp);
    
28.     }
    
29. }
    
30. 
    
31. void screen_draw_border(screen_t *screen, char ch) {
    
32.     for(size_t y = 0; y < screen->height; ++y) {
    
33.         for(size_t x = 0; x < screen->width; ++x) {
    
34.             if(y == 0 || x == 0 || y == screen->height - 1 || x == screen->width - 1)
    
35.                 screen_putchar(screen, x, y, ch);
    
36.         }
    
37.     }
    
38. }
    

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跳转到最佳答案楼层

人造人

在数学中怎么画圆，在编程中就怎么画圆

main.c

1. #include "screen.h"
   
2. #include <math.h>
   
3. 
   
4. void circle(screen_t *screen, size_t x, size_t y, size_t r) {
   
5.     for(double i = 0; i < 2 * M_PI; i += M_PI / 180) {
   
6.         screen_putchar(screen, x + (cos(i) * r) * 1.8, y + sin(i) * r, '0');
   
7.     }
   
8. }
   
9. 
   
10. int main(void) {
    
11.     screen_t *screen = screen_init(130, 41);
    
12.     screen_draw_border(screen, '#');
    
13.     circle(screen, screen->width / 2, screen->height / 2, 15);
    
14.     screen_refresh(screen, stdout);
    
15.     screen_deinit(screen);
    
16.     return 0;
    
17. }
    

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screen.h

1. #ifndef _SCREEN_H_
   
2. #define _SCREEN_H_
   
3. 
   
4. #include <stdio.h>
   
5. #include <stddef.h>
   
6. 
   
7. typedef struct {
   
8.     size_t width, height;
   
9.     char *buff;
   
10. } screen_t;
    
11. 
    
12. screen_t *screen_init(size_t width, size_t height);
    
13. void screen_deinit(screen_t *screen);
    
14. void screen_putchar(screen_t *screen, size_t x, size_t y, char ch);
    
15. void screen_refresh(screen_t *screen, FILE *fp);
    
16. void screen_draw_border(screen_t *screen, char ch);
    
17. 
    
18. #endif
    

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screen.c

1. #include "screen.h"
   
2. #include <stdlib.h>
   
3. #include <string.h>
   
4. 
   
5. screen_t *screen_init(size_t width, size_t height) {
   
6.     screen_t *screen = malloc(sizeof(*screen));
   
7.     *screen = (screen_t){width, height, malloc(width * height)};
   
8.     memset(screen->buff, ' ', screen->width * screen->height);
   
9.     return screen;
   
10. }
    
11. 
    
12. void screen_deinit(screen_t *screen) {
    
13.     free(screen->buff);
    
14.     free(screen);
    
15. }
    
16. 
    
17. void screen_putchar(screen_t *screen, size_t x, size_t y, char ch) {
    
18.     if(x < screen->width && y < screen->height)
    
19.         screen->buff[y * screen->width + x] = ch;
    
20. }
    
21. 
    
22. void screen_refresh(screen_t *screen, FILE *fp) {
    
23.     for(size_t y = 0; y < screen->height; ++y) {
    
24.         for(size_t x = 0; x < screen->width; ++x) {
    
25.             fputc(screen->buff[y * screen->width + x], fp);
    
26.         }
    
27.         fputc('\n', fp);
    
28.     }
    
29. }
    
30. 
    
31. void screen_draw_border(screen_t *screen, char ch) {
    
32.     for(size_t y = 0; y < screen->height; ++y) {
    
33.         for(size_t x = 0; x < screen->width; ++x) {
    
34.             if(y == 0 || x == 0 || y == screen->height - 1 || x == screen->width - 1)
    
35.                 screen_putchar(screen, x, y, ch);
    
36.         }
    
37.     }
    
38. }
    

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人造人

我就是问一下
不用grace.h,如何画圆？那使用grace.h,如何画圆？

完全没有听说过 grace.h 这个头文件，你是不是又因为不认真写错单词了？
你想写的是这个？
graphics.h