help about collisions....

[bluemagica]

It is best to say here, that i am using as2 and have no idea about as3... now, the most common method to detect collision is using hitTest , but this takes the entire bounding box into consideration, thus making...err...rectangular collisions, not collision between actual shapes. So how do i check for collision between two shapes? at many places i have seen that "you should detect complex collision using mathematics", and they only give example of a square or circle as complex shape.....achieving this for irregular shapes seems quite hard, and it seems almost impossible for a animation sequence....so whats the walk-around?

[andrewProgrammer]

The hitTest uses a bounding box collision, but there is another way to use it. What it is is "movieClip.hitTest(x, y, true)". The "movieClip" is the movie clip that will be the collision-e (the one that gets hit). Inside of the "()" there is "x" which is the x-point in which will hit the collision-e. The "y" is the y-point in which will hit the collision-e. I don't know why there is the "true", but you have to have it or else it won't work. When you put the x and y together it makes one point. This point will be tested if is being touched by the EXACT shape of the collision-e (no matter how abnormal the shape).

I hope that this helped you. I have been coding for 2 years, and I have'nt been able to find a better collision test.

[bluemagica]

No andrew that isnt quite the solution i was looking for, as this method is for point vs shape, i want shape vs shape. bitmapdata.hitTest seems to be a potential solution to my work, but still, as far as i see, there is no shape vs shape collision in flash....

[ASWC]

bluemagica, if you don't want to use hitTest it's up to you but then you just have to write your own collision detections and I hope for you that you have a good understanding of this. if you don't, use hitTest and say thank you for andrewProgrammer advice instead of just refusing and being rude.

[rrh]

ASWC: That wasn't rude, that was a correction.

bluemagica: The reason the usual answer is vague stuff about detecting the collision through math is that there isn't one simple solution. The bitmapdata thing sounds promising. I haven't tried it, though, so I guarantee nothing.

[8bitjeff]

BitmapData will definitely do the job. It eats up a little more process time, but it works great. I have a tutorial on using it in AS2. You can read it here: http://www.8bitrocket.com/newsdisplay.aspx?newspage=2551

I have a new one on doing it in AS3 here: http://www.8bitrocket.com/newsdisplay.aspx?newspage=9947

And a slightly easier one that is a little older (still in AS3): http://http://www.8bitrocket.com/newsdisplay.aspx?newspage=6421

I hope this helps. It really isn't that difficult once you have all of your graphics in BitmapData objects.

[bluemagica]

Thanks to both of you, rrh, and 8bitjeff....i havent learned as3 yet, but the as2 one is pretty helpful...it seems i was in the right direction afterall, and thanks to your help i can make my game possible. Thanks again....

And ASWC, do you really consider reclarifying my question as rudeness?I was only telling andrew what i need actually, cause i believed, i might not have made myself clear in the first post.