#include "snapshot.h"

#include "player.h"

vec2
dp_player_calculate_acceleration(const struct player *p)
{
	vec2 acc, dec;
	int x = 0, y = 0;

	if (p->input & INPUT_UP)
	{
		y -= 1;
	}
	if (p->input & INPUT_DOWN)
	{
		y += 1;
	}

	if (p->input & INPUT_LEFT)
	{
		x -= 1;
	}
	if (p->input & INPUT_RIGHT)
	{
		x += 1;
	}

	acc = dp_vec2_new((float)x, (float)y);
	acc = dp_vec2_normal(acc);
	acc = dp_vec2_mul(acc, PLAYER_ACCELERATION);

	dec = dp_vec2_mul(p->vel, -1.0f * PLAYER_DRAG);

	return dp_vec2_add(acc, dec);
}