FLASH: URGENT: Still working on collision

[George Gleissner]

Howdy,

I'm still trying to make this collision thing happen. I am working in Flash

5 and using the HitTest

method. However, I am confused on how to reference my objects.


Here's the basic setup:

Two boats travel across the screen in the background.  Standing on the dock

the player has to throw

crabs into the back of the boats(using a square for the hit area).


The crabs are set up like this:

Crab: instance name crab(movie clip:onstage)

	>Crab (motion clip:library)


Then there are two instances of the boat movie clip: leftboat and rightboat

(these move via ActionScript)

Leftboat (instance)

	>Boat (movieclip)

		>Boattarget(movie clip on boat timeline/instance name: tbox)


So basically, do I refernce the instances or the symbols themselves? And

where do I put the code;

in the main timeline, the symbols, or the instances?


Thanks,

George Gleissner

Web Production Specialist

Association of Legal Administrators

847.247.5572

ggleissneralanet [dot] org

-----Original Message-----

From: Gregg Caines [

gcneometrixsystems [dot] com (mailto:gcneometrixsystems [dot] com)

]

Sent: Monday, October 30, 2000 3:47 PM

To:

flasherchinwag [dot] com

Subject: Re: FLASH: ActionScript Help



Well collision detection requires that you know the coordinates

of each point on the entire perimeter of the object.  The easiest

method is to make the perimeters for the objects simple squares

and create some algorithm to check if the two squares overlap.

You'll need to use width, height, x, and y properties and you'll

need to check for collision with each of the four corners.

The corners for a movie clip will be at these coordinates:

(x,y)

(x+width,y)

(x,y+height)

(x+width,y+height)


For example, you'll know if a given corner of MC1 is inside MC2

if both of its coordinates are greater than or equal to the coordinates

of MC2's upper left corner and less than or equal to the coordinates

of MC2's lower right corner.  You'll need to test all 4 corners too...


Also, if the movie clips are different sizes, make sure you're testing

the corners of the smaller one.


Hopefully that makes a little sense...


---------------------------------------------------

Gregg Caines

n e o m e t r i x  systems inc.

http://www.neometrixsystems.com

gcainesneometrixsystems [dot] com

> I tried that and it did work, however I am having trouble associating that

> set of variables with the set from another object to determine collision.

>

> The second object is also a motion clip which moves across the screen via

> ActionScript.

>

> So, basically I can get the coordinates for both objects, I just don't

know

> how to make them

> talk to each other.

>

> Thanks,

> George Gleissner

> Web Production Specialist

> Association of Legal Administrators

> 847.247.5572

>

ggleissneralanet [dot] org

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flasher is generously supported by...

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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 November 27-29, 2000, LONDON, National Film Theatre


   Produced by United Digital Artists and lynda.com

-Sponsored by Macromedia, Adobe Systems and Apple Computer

-http://www.flashforward2000.com  or UK tel. +44 (0870) 751 1526

       Register before November 10 and save £200

            http:// www.flashforward2000.com

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  To unsubscribe or change your list settings go to

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