Re: [pygame] Some Platforms

[Manuel <frame_256@xxxxxxxxxxxx>]

Kris, what you say is already implemented.
See my other reply for physics, and thanks.

El Domingo, 20 de Febrero de 2005 19:26, Kris Schnee escribió:
> Manuel wrote:
> > Hello Matt
> >
> > Of course, ANY help is welcome, i've recently changed my code from:
> > 	sprite always asking; I'm on the platform??
> > for:
> > 	platfom sayig, you are not on me, so start falling
> >
> > This adds more complexity, but could be used for some games.
> > For example, if you want a sprite to always be on the platform, the
> > simpler version is well, but what happens if a platform just disappear or
> > rapidly change it's position?? the sprites on it have to start falling.
> > Of course this is ugly for elevators, like in Abuse, when it does not
> > matter how the elevator falls, the player should always be on it.
>
> I haven't played enough with collisions in Pygame to give advice on what
> commands to use, but this is the method I think I used elsewhere, once:
>
> Give each object an X speed and a Y speed.
> Every so often, have the world run this code:
> --For each object in the world:
> ----object.Y_speed -= GRAVITY
> ----If object.Y_Speed > MAX_FALLING_SPEED: set it to MAX_FALLING_SPEED.
> ----Change object's X and Y position by [speed] units.
> ----If object's new position is inside another object: Move it back.
> (Really you'd want to only move it back until it's no longer
> overlapping. You could even send the object a message that's it's hit
> something, so it can take damage or play a sound.)
>
> This is a simple but fairly realistic simulation of real physics. All
> objects' vertical speed in reality is constantly getting tugged
> downward. If you simulate motion this way, you get some cool effects
> "for free." For instance, if you create a ball with a certain X and Y
> speed, it will automatically move in an arc just like a real one. If you
> can make an elevator fall so fast the hero gets slammed against the
> ceiling, players will think that's cool!
>
> With your "moment of science,"
> Kris