Hi Jason,
Looking at this piece of code, I would indeed say you shouldn't need to
correct, assuming there are no problems on the side of the Missle class
(there seems to be a typo in the name?) when setting the self.position.
Regards,
Ivo
On Tue, 2012-05-08 at 14:29 -0700, Jason wrote:
> I think this nailed it on the head. I did some relative coordinate
> correction and it seems to be working correctly. HOWEVER. the Missile
> is NOT a child of the Capitol Ship (CS) , it's a child of the same
> layer that the Capitol Ship belongs to.
>
> I passed in the parent layer to the CS, (thinking I could only add to
> the layers, not to other Sprites), then used that layer to add the
> missile to it. So I SHOULDN'T have to correct for relative
> positioning, correct?
>
> class CapitolShip(Sprite, Seeking):
> def __init__(self, center_x, center_y, radius, target,
> parentLayer):
> super( CapitolShip, self ).__init__('capitolShip.png')
> self.position = (center_x, center_y)
> self.cshape = cm.CircleShape(eu.Vector2(center_x, center_y),
> radius)
>
> self.target = target
>
> self.randomXRangeFromMS = random.randrange(-100, 100)
> self.randomYRangeFromMS = random.randrange(100, 200)
> self.schedule(self.seekAndDestroy)
>
> self.angle = 0
> self.schedule_interval(self.turnTowardsTarget,.3)
>
> self.schedule_interval(self.fire,2)
> self.parentLayer = parentLayer
> self.hasFired = False
>
>
> def fire(self, dt):
> if(not self.hasFired):
> self.parentLayer.add(Missle(self.position, 10,
> self.target),9)
> self.hasFired=True
>
> On May 6, 11:49 am, claudio canepa <[email protected]> wrote:
> > On Sun, May 6, 2012 at 2:50 PM, Jason <[email protected]> wrote:
> > > I'm writing a little game in cocos2d, trying to use the Bezier Action
> > > and Bezier path to make a Missile fired from a Capitol Ship the
> > > missile fly at the Mother Ship in a cool, loopy kinda way.
> >
> > > My problem seems to be what I think is a position isn't what Bezier
> > > thinks is a position. I give it the Mothership position, and the
> > > Missile starting position (wherever its Capitol Ship is at the time) ,
> > > and tell the Missile to make it's way to the Mothership.
> >
> > If all the entities are direct childs of a Gamelayer or some other node,
> > then a Bezier from missile.position (at spawn time) to mothership.position
> > (at spawn time) should provide a travel path from missile.position to
> > mothership.position.
> >
> > If thats not true (by example, if missile is child to capitol_ship) then
> > you have to do some coordinate changes: all the points in the bezier must
> > be in the same coordinate space.
> > There it can be handy the CocosNodes methods point_to_world,
> > point_to_local
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > > However, the Bezier Path seems to think 0, 0 is where ever the Missile
> > > has spawned, not absolute position on the screen.
> > > How can I get the Bezier Path to take absolute position? Here's the
> > > bit of code from the Missile class
> >
> > > def hitTarget(self):
> > > tx, ty = self.target.position
> > > mx, my = self.position
> > > # this bit of code makes the missile do weird things
> > > # path = BezPath( (mx, my), #first point
> > > # (tx, ty), #end point
> > > # (mx-10, my-20), #second point
> > > # (mx-20, my-30)) #third
> >
> > > #this bit of code makes the Missile spawn correctly, but will I have
> > > to calculate the relative position
> > > #of the mother ship to make it hit?
> > > path = BezPath( (0, 0), #first point
> > > (0, 0), #end point
> > > (-10, -20), #second point
> > > (-20, -30)) #third
> >
> > > self.do(BezAction(path, 2 ))
> >
> > > --
> >
> > You need to clarify the parent - child relationship to asses the correctnes
> > of your code
> >
> > claudio
> >
> > --
>
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