collision error

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Last post 11/11/2008 4:11 AM by Jaeyoon. 7 replies.

11/8/2008 10:03 PM

Jaeyoon

(0)
Posts 22

collision error

Reply Quote

Im trying to get my icicles to fall when they get hit by a projectile. I have the icicles in an array. They are loaded across the top of the screen and i have the firing code going fine for my projectiles. But when the projectiles hit the icicles on the top of the screen, the projectiles die but the icicles dont fall.. Help plz.
here is my code: http://rafb.net/p/KhCm1s17.html

11/8/2008 10:26 PM

In reply to

FortisVenaliter Productions

(2004)
Posts 1,306

Re: collision error

Reply Quote

Do you update the position of the icicle anywhere else? Because it looks to me like you update it only for the one frame when it is colliding with the ball (and the velocity is still 0)

Regards,
Louis Ingenthron
Fortis Venaliter
Lead Developer of

FV Productions

11/9/2008 1:53 AM

In reply to

Jaeyoon

(0)
Posts 22

Re: collision error

Reply Quote

this is the only other code that affects icicleroof:

http://rafb.net/p/wctOuA35.html

I set the velocity in the update icicle method with the line:
icicle.velocity = new Vector2(0, (float)icicle.position.Y - 1.0f) * 2.0f;

11/9/2008 2:00 AM

In reply to

FortisVenaliter Productions

(2004)
Posts 1,306

Re: collision error

Reply Quote

Yep, but just setting the velocity won't do anything. Somewhere, you need to do
icicle.position += icicle.velocity;
every frame. Or, better yet,
icicle.position += icicle.velocity * (float)gameTime.ElapsedGameTime.TotalSeconds;

Regards,
Louis Ingenthron
Fortis Venaliter
Lead Developer of

FV Productions

11/9/2008 4:50 AM

In reply to

Jaeyoon

(0)
Posts 22

Re: collision error

Reply Quote

line 57 in the first link that i gave has the code: icicle.position += icicle.velocity; /? that statement is held in the updateProjectile method. I have updateProjectile; in the update method. So I dont understand why its not working. Will adding the gametime line make it work?

11/9/2008 8:11 AM

In reply to

FortisVenaliter Productions

(2004)
Posts 1,306

Re: collision error

Reply Quote

Because, if I read it right, it will only update the icicle velocity for the one frame that it is collided with a projectile.

Regards,
Louis Ingenthron
Fortis Venaliter
Lead Developer of

FV Productions

11/9/2008 4:36 PM

In reply to

Jaeyoon

(0)
Posts 22

Re: collision error

Reply Quote

So then in order to fix that should i just put the icicle.position += icicle.velocity; directly into the update method instead of a separate method that is called by the update method?

11/11/2008 4:11 AM

In reply to

Jaeyoon

(0)
Posts 22

Re: collision error

Reply Quote

Ok so here is what i tried:
I put the statement:
foreach( gameobject icicle in icicles)
{
if (icicle.hit)
{
icicle.position += icicle.velocity;
}
}

and its still not working. I thought the update method does this statement during each frame so then i dont understand how it could be adding it for only the one frame that the projectile collides with the icicle.

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