如何画圆？
不用grace.h,如何画圆？ 在数学中怎么画圆，在编程中就怎么画圆main.c
#include "screen.h"
#include <math.h>
void circle(screen_t *screen, size_t x, size_t y, size_t r) {
for(double i = 0; i < 2 * M_PI; i += M_PI / 180) {
screen_putchar(screen, x + (cos(i) * r) * 1.8, y + sin(i) * r, '0');
}
}
int main(void) {
screen_t *screen = screen_init(130, 41);
screen_draw_border(screen, '#');
circle(screen, screen->width / 2, screen->height / 2, 15);
screen_refresh(screen, stdout);
screen_deinit(screen);
return 0;
}
screen.h
#ifndef _SCREEN_H_
#define _SCREEN_H_
#include <stdio.h>
#include <stddef.h>
typedef struct {
size_t width, height;
char *buff;
} screen_t;
screen_t *screen_init(size_t width, size_t height);
void screen_deinit(screen_t *screen);
void screen_putchar(screen_t *screen, size_t x, size_t y, char ch);
void screen_refresh(screen_t *screen, FILE *fp);
void screen_draw_border(screen_t *screen, char ch);
#endif
screen.c
#include "screen.h"
#include <stdlib.h>
#include <string.h>
screen_t *screen_init(size_t width, size_t height) {
screen_t *screen = malloc(sizeof(*screen));
*screen = (screen_t){width, height, malloc(width * height)};
memset(screen->buff, ' ', screen->width * screen->height);
return screen;
}
void screen_deinit(screen_t *screen) {
free(screen->buff);
free(screen);
}
void screen_putchar(screen_t *screen, size_t x, size_t y, char ch) {
if(x < screen->width && y < screen->height)
screen->buff = ch;
}
void screen_refresh(screen_t *screen, FILE *fp) {
for(size_t y = 0; y < screen->height; ++y) {
for(size_t x = 0; x < screen->width; ++x) {
fputc(screen->buff, fp);
}
fputc('\n', fp);
}
}
void screen_draw_border(screen_t *screen, char ch) {
for(size_t y = 0; y < screen->height; ++y) {
for(size_t x = 0; x < screen->width; ++x) {
if(y == 0 || x == 0 || y == screen->height - 1 || x == screen->width - 1)
screen_putchar(screen, x, y, ch);
}
}
}
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
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