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collision detection

Started by lemonstix Jul 31, 2002 at 8:20 AM 8 replies 900+ views

Original Post

Jul 31, 2002 at 8:20 AM

I am wondering how to do collision detection for my very simple 2D game (top view). I have created a graphical map but the user can travel anywhere in it, regardless of trees or any other obstacles. I have tried looking in the tutorials, but none of them are easy enough to understand. Could someone explain this to me? one of the problems is that the two objects colliding are not just two rectangles. one is the user, the other is a map...it''s just a picture. Will this not work? SHould I create a ASCII version of the map? Any help would be great

JOL

Jul 31, 2002 at 8:26 AM

you could use rectangles anyway, just put them on the right spot (on the map).
it is quite easy to use circles too (check for distance to a centerpos)
you can also make the detection using multiple rectangles and circles for each object.

the easiest way would be to have a rectagular grid of numbers that is combined with the map and where there is a number you will collide and where there is a zero you don''t...

think about it some and you''ll figure it out.

Samith

Jul 31, 2002 at 9:09 AM

if its a big map per pixel collision detection would be pretty slow. i would suggest just putting rectangles on the map and testing those.

Sam Johnston (Samith)

Amma

Jul 31, 2002 at 9:20 AM

That''s easy

Map[100, 100] (In tiles)

Player pos = {23, 86} (In pixels)

How to get the tile beneath the player
---------------------------------------
TheTile = Map[ ((PlayerPosX / TileDX) * TileDX), ((PlayerPosY / TileDY) * TileDY) ]

You can now check if the Tile is one that the player may step over or not.

Look at my old 2D games at http://tmb.united.net.kg

-----------------------------
AM

rmdeboer82

Jul 31, 2002 at 3:18 PM

hyt

coriolis666

Jul 31, 2002 at 11:34 PM

Collision detection is easy. Try it on SDL.

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