 | | | hitTest question | hitTest question 2004-03-18 - By Jesse Warden
Back
Well, with another language, you'd have options, but with Flash, I only see
2, but I know games have been discussed on Flashcoders, so maybe you can get
some answers from the archives.
In the meantime, old school way is your array method:
mc_array = [one_mc, two_mc, three_mc];
function didHit(mc)
{
var i = mc_array.length;
while(i--){
if(mc.hitTest(mc_array[i])){
return mc_array[i];
}
}
return false;
}
var r = didHit(mc);
if(r != false){
// you hit r
trace(mc + " hit the mc: " + r);
}
Or, you could do a tilebased approach; you have a grid of tiles. Each mc
occupies a tile, and only one tile at a time. That way, you can simply check
the value of an multidimensional array.
if(md_array[3][3] == 1){
// occupied
}else if(md_array[3][3] == 0){
// open, move away!
}
-- --Original Message-- --
From: Jason Merrique [mailto:j.merrique@(protected)]
Sent: Thursday, March 18, 2004 07:14 AM
To: flashnewbie@(protected)
Subject: RE: [Flashnewbie] hitTest question
Oops, forgot something:
As a workaround, I had planned to put all the relevant mc's into an array,
and then cycle through the array doing a hitTest with each mc. I'm sure
there's a more efficient way though....
Cheers
Json
__ __
From: Jason Merrique [mailto:j.merrique@(protected)]
Sent: 18 March 2004 12:12
To: flashnewbie@(protected)
Subject: [Flashnewbie] hitTest question
Hi Chaps,
I've got a quick question:
MovieClip.hitTest()
Does the target need to be specific? i.e. Is it possible to have this return
true if MovieClip collides with *anything*?
The reason for asking is that I've created a movie in which lots of objects
are moving around (randomly) and I don't want them to overlap.
Thanks in advance!
Jason
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<DIV><SPAN class=211203513-18032004>Well, with another language, you'd have
options, but with Flash, I only see 2, but I know games have been discussed on
Flashcoders, so maybe you can get some answers from the archives.</SPAN></DIV>
<DIV><SPAN class=211203513-18032004></SPAN> </DIV>
<DIV><SPAN class=211203513-18032004>In the meantime, old school way is your
array method:</SPAN></DIV>
<DIV><SPAN class=211203513-18032004></SPAN> </DIV>
<DIV><SPAN class=211203513-18032004>mc_array = [one_mc, two_mc,
three_mc];</SPAN></DIV>
<DIV><SPAN class=211203513-18032004></SPAN> </DIV>
<DIV><SPAN class=211203513-18032004>function didHit(mc)</SPAN></DIV>
<DIV><SPAN class=211203513-18032004>{</SPAN></DIV>
<DIV><SPAN class=211203513-18032004> var i =
mc_array.length;</SPAN></DIV>
<DIV><SPAN class=211203513-18032004> while(i--){</SPAN></DIV>
<DIV><SPAN class=211203513-18032004>
if(mc.hitTest(mc_array[i])){</SPAN></DIV>
<DIV><SPAN
class=211203513-18032004>
return mc_array[i];</SPAN></DIV>
<DIV><SPAN class=211203513-18032004>
}</SPAN></DIV>
<DIV><SPAN class=211203513-18032004> }</SPAN></DIV>
<DIV><SPAN class=211203513-18032004> return
false;</SPAN></DIV>
<DIV><SPAN class=211203513-18032004>}</SPAN></DIV>
<DIV><SPAN class=211203513-18032004></SPAN> </DIV>
<DIV><SPAN class=211203513-18032004>var r = didHit(mc);</SPAN></DIV>
<DIV><SPAN class=211203513-18032004>if(r != false){</SPAN></DIV>
<DIV><SPAN class=211203513-18032004> // you hit r</SPAN></DIV>
<DIV><SPAN class=211203513-18032004> trace(mc + " hit the mc:
" + r);</SPAN></DIV>
<DIV><SPAN class=211203513-18032004>}</SPAN></DIV>
<DIV><SPAN class=211203513-18032004></SPAN> </DIV>
<DIV><SPAN class=211203513-18032004>Or, you could do a tilebased approach; you
have a grid of tiles. Each mc occupies a tile, and only one tile at a
time. That way, you can simply check the value of an multidimensional
array.</SPAN></DIV>
<DIV><SPAN class=211203513-18032004></SPAN> </DIV>
<DIV><SPAN class=211203513-18032004>if(md_array[3][3] == 1){</SPAN></DIV>
<DIV><SPAN class=211203513-18032004> // occupied</SPAN></DIV>
<DIV><SPAN class=211203513-18032004>}else if(md_array[3][3] == 0){</SPAN></DIV>
<DIV><SPAN class=211203513-18032004> // open, move
away!</SPAN></DIV>
<DIV><SPAN class=211203513-18032004>}</SPAN></DIV>
<DIV><SPAN class=211203513-18032004></SPAN> </DIV>
<DIV><SPAN class=211203513-18032004></SPAN> </DIV>
<DIV><SPAN class=211203513-18032004> </SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma>-- --Original Message-- --<BR><B>From:</B> Jason Merrique
[mailto:j.merrique@(protected)] <BR><B>Sent:</B> Thursday, March 18, 2004
07:14 AM<BR><B>To:</B> flashnewbie@(protected)<BR><B>Subject:</B>
RE: [Flashnewbie] hitTest question<BR><BR></FONT></DIV>
<DIV dir=ltr align=left><SPAN class=094251212-18032004>Oops, forgot
something:</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=094251212-18032004></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=094251212-18032004>As a workaround, I had
planned to put all the relevant mc's into an array, and then cycle through
the
array doing a hitTest with each mc. I'm sure there's a more efficient way
though....</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=094251212-18032004></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=094251212-18032004>Cheers</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=094251212-18032004></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=094251212-18032004>Json</SPAN></DIV>
<DIV> </DIV><BR>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma><B>From:</B> Jason Merrique
[mailto:j.merrique@(protected)] <BR><B>Sent:</B> 18 March 2004
12:12<BR><B>To:</B> flashnewbie@(protected)<BR><B>Subject:</B>
[Flashnewbie] hitTest question<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><SPAN class=330570512-18032004>Hi Chaps,</SPAN></DIV>
<DIV><SPAN class=330570512-18032004></SPAN> </DIV>
<DIV><SPAN class=330570512-18032004>I've got a quick question:</SPAN></DIV>
<DIV><SPAN class=330570512-18032004></SPAN> </DIV>
<DIV><SPAN class=330570512-18032004><SPAN class=heading1>MovieClip.hitTest(
)
</SPAN></SPAN></DIV>
<DIV><SPAN class=330570512-18032004><SPAN
class=heading1></SPAN></SPAN> </DIV>
<DIV><SPAN class=330570512-18032004><SPAN class=heading1>Does the target
need to be specific? i.e. Is it possible to have this return true if
MovieClip collides with *anything*?</SPAN></SPAN></DIV>
<DIV><SPAN class=330570512-18032004><SPAN
class=heading1></SPAN></SPAN> </DIV>
<DIV><SPAN class=330570512-18032004><SPAN class=heading1>The reason for
asking is that I've created a movie in which lots of objects are moving
around (randomly) and I don't want them to overlap.</SPAN></SPAN></DIV>
<DIV><SPAN class=330570512-18032004><SPAN
class=heading1></SPAN></SPAN> </DIV>
<DIV><SPAN class=330570512-18032004><SPAN class=heading1>Thanks in
advance!</SPAN></SPAN></DIV>
<DIV><SPAN class=330570512-18032004><SPAN
class=heading1></SPAN></SPAN> </DIV>
<DIV><SPAN class=330570512-18032004><SPAN
class=heading1>Jason</SPAN></SPAN></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY><
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