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/*
game/ship.cc
This file is part of the Osirion project and is distributed under
the terms and conditions of the GNU General Public License version 2
*/
// project headers
#include "game/ship.h"
#include "math/mathlib.h"
// C++ headers
#include <iostream>
using math::degrees360f;
using math::degrees180f;
namespace game {
Ship::Ship()
{
speed = 0;
yaw_current = 0;
yaw_target = yaw_current;
thrust_current = 0;
// ship specs
acceleration = 1.5f;
speed_max = 4.0f;
yaw_speed = 4.0f;
}
Ship::~Ship()
{
}
void Ship::set_yaw(float y)
{
yaw_target = degrees360f(y);
}
void Ship::set_thrust(float t)
{
if (t < 0)
thrust_current = 0;
else if (t > 1)
thrust_current = 1;
else
thrust_current = t;
}
void Ship::update(float elapsed)
{
// update yaw
float yaw_offset = degrees180f(yaw_target - yaw_current);
float d = yaw_speed * elapsed * yaw_offset;
yaw_current = degrees360f(yaw_current + d);
// update thrust
if (speed < thrust_current * speed_max) {
speed += acceleration * elapsed;
if (speed > thrust_current * speed_max) {
speed = thrust_current * speed_max;
}
} else if(speed > thrust_current * speed_max) {
speed -= acceleration * elapsed;
if (speed < 0) speed = 0;
}
// location TODO avoid sin/cos calculations
location.x += cosf(yaw_current * M_PI / 180) * speed * elapsed;
location.z -= sinf(yaw_current * M_PI / 180) * speed * elapsed;
}
} // namespace game
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