#include <stdio.h>

#include "camera.h"

void init_camera(struct camera *cam)
{
	cam->pos.x   = cam->pos.y   = 0;
	cam->speed.x = cam->speed.y = 0;
	cam->zoom = 1;
	cam->zoom_rate = 1;
}

void move_camera(struct camera *cam, const double time)
{
	struct vector tmp;

	vector_scale(&cam->speed, time / cam->zoom, &tmp);
	vector_add(&cam->pos, &tmp, &cam->pos);

	cam->zoom *= pow(cam->zoom_rate, time);
}

void print_camera(const struct camera *cam)
{
	printf("cam pos (%.2f, %.2f), speed (%.2f, %.2f), zoom (%.2f, %.2f)\n",
	       cam->pos.x, cam->pos.y, cam->speed.x, cam->speed.y,
	       cam->zoom, cam->zoom_rate);
}