Physics like asteroides
- by user2933016
I try to make a ship that has the physic properties like asteroides.
I have this for now(All in Java):
Ship.class
public class Ship
{
public static final float sMaxHealth = 0.1F;
public static final float sMaxMoveVelocity = 5.0F;
public static final float sMaxAngleVelocity = 20.0F;
public static final float sRadius = 1.0F;
public static final float sMoveDeceleration = 10.0F;
public static final float sMoveAcceleration = 2.0F;
public static final float sAngleDeceleration = 15.0F;
public static final float sAngleAcceleration = 20.0F;
private float mHealth;
private float mXVelocity;
private float mYVelocity;
private float mAngleVelocity;
private float mX;
private float mY;
private float mAngle;
}
(I let the getter and setter away for now)
Controller code
// Player input
if(Gdx.input.isKeyPressed(Keys.UP))
{
mPlayer.setXVelocity(mPlayer.getXVelocity() + (float) Math.cos(mPlayer.getAngle()) * Ship.sMoveAcceleration);
mPlayer.setYVelocity(mPlayer.getYVelocity() + (float) Math.sin(mPlayer.getAngle()) * Ship.sMoveAcceleration);
}
if(Gdx.input.isKeyPressed(Keys.LEFT))
{
mPlayer.setAngleVelocity(mPlayer.getAngleVelocity() + Ship.sAngleAcceleration * pDeltaTime);
}
if(Gdx.input.isKeyPressed(Keys.RIGHT))
{
mPlayer.setAngleVelocity(mPlayer.getAngleVelocity() - Ship.sAngleAcceleration * pDeltaTime);
}
// X velocity
if(mPlayer.getXVelocity() < 0)
{
if(-mPlayer.getXVelocity() > Ship.sMaxMoveVelocity)
{
mPlayer.setXVelocity(-Ship.sMaxMoveVelocity);
}
mPlayer.setXVelocity(mPlayer.getXVelocity() + Ship.sMoveDeceleration * pDeltaTime);
if(mPlayer.getXVelocity() > 0)
{
mPlayer.setXVelocity(0);
}
}
else
if(mPlayer.getXVelocity() > 0)
{
if(mPlayer.getXVelocity() > Ship.sMaxMoveVelocity)
{
mPlayer.setXVelocity(Ship.sMaxMoveVelocity);
}
mPlayer.setXVelocity(mPlayer.getXVelocity() - Ship.sMoveDeceleration * pDeltaTime);
if(mPlayer.getXVelocity() < 0)
{
mPlayer.setXVelocity(0);
}
}
// Y velocity
if(mPlayer.getYVelocity() < 0)
{
if(-mPlayer.getYVelocity() > Ship.sMaxMoveVelocity)
{
mPlayer.setYVelocity(-Ship.sMaxMoveVelocity);
}
mPlayer.setYVelocity(mPlayer.getYVelocity() + Ship.sMoveDeceleration * pDeltaTime);
if(mPlayer.getYVelocity() > 0)
{
mPlayer.setYVelocity(0);
}
}
else
if(mPlayer.getYVelocity() > 0)
{
if(mPlayer.getYVelocity() > Ship.sMaxMoveVelocity)
{
mPlayer.setYVelocity(Ship.sMaxMoveVelocity);
}
mPlayer.setYVelocity(mPlayer.getYVelocity() - Ship.sMoveDeceleration * pDeltaTime);
if(mPlayer.getYVelocity() < 0)
{
mPlayer.setYVelocity(0);
}
}
// Angle velocity
if(mPlayer.getAngleVelocity() < 0)
{
if(-mPlayer.getAngleVelocity() > Ship.sMaxAngleVelocity)
{
mPlayer.setAngleVelocity(-Ship.sMaxAngleVelocity);
}
mPlayer.setAngleVelocity(mPlayer.getAngleVelocity() + Ship.sAngleDeceleration * pDeltaTime);
if(mPlayer.getAngleVelocity() > 0)
{
mPlayer.setAngleVelocity(0);
}
}
else
if(mPlayer.getAngleVelocity() > 0)
{
if(mPlayer.getAngleVelocity() > Ship.sMaxAngleVelocity)
{
mPlayer.setAngleVelocity(Ship.sMaxAngleVelocity);
}
mPlayer.setAngleVelocity(mPlayer.getAngleVelocity() - Ship.sAngleDeceleration * pDeltaTime);
if(mPlayer.getAngleVelocity() < 0)
{
mPlayer.setAngleVelocity(0);
}
}
mPlayer.setX(mPlayer.getX() + mPlayer.getXVelocity() * pDeltaTime);
mPlayer.setY(mPlayer.getY() + mPlayer.getYVelocity() * pDeltaTime);
mPlayer.setAngle(mPlayer.getAngle() + mPlayer.getAngleVelocity() * pDeltaTime);
Why the ship does not behave like in asteroides ?
What do I wrong?
