src/ball.c


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#include <stdlib.h>
#include <math.h>
#include <curses.h>

#include "ball.h"

struct ball *
new_ball(float x, float y, float speed, float dir)
{
	struct ball *b;

	b = malloc(sizeof(*b));
	if (b == NULL) {
		return NULL;
	}

	b->x = x;
	b->y = y;
	b->speed = speed;
	b->dir = dir;

	return b;
}

void
free_ball(struct ball *b)
{
	free(b);
}

void
clear_ball(struct ball *b)
{
	mvprintw((int) (b->y + 0.5), (int) (b->x + 0.5), " ");
}

void
update_ball(struct ball *b)
{
	b->x += cosf(b->dir) * b->speed;
	b->y += sinf(b->dir) * b->speed;
}

void
draw_ball(struct ball *b)
{
	mvprintw((int) (b->y + 0.5), (int) (b->x + 0.5), "o");
}