This demo shows the use of the jt_vectors library to implement a version of Spacewar!, one of the first computer games ever created. Orbital movement and complex collision detection of irregular shapes is demonstrated.
See the Pointing the Way to Vectors article for background information and discussion of the techniques used.
ID:113634
 Jul 26 2009, 10:00 pm
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May 23 2011, 4:31 pm
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Tsfreaks
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Wicked good stuff
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This demo has a runtime error that happens in a loop on line 281 of file VectorDemo3.dm:
Line 281: "for(h in ourshape.hull)" of check collision proc: "[code]proc/check_collision() // check ship-sun collision // note this is simple check if ship is too close to sun if(pos.Magnitude2() < 576) // 24**2 explode(1) del(src) // check ship-ship collision // will check to see if any of our ship's vertices are inside the other ship // note this is not sufficient to test for collision, but other ship will also // test the same thing against us, which is sufficient var/mob/ship/S for(S in orange(1,src)) // look within 1 tile for ship objects break if(!S) // no other ship in range, so end return var/vector/h var/vector/offset = pos.SubVector(S.pos) // this is the shape of the other ship (on it's current heading) var/shape/othershape = S.shapes[S.heading_state] // this is the shape of our ship var/shape/ourshape = shapes[heading_state] var/hit = FALSE // check each of our hull vertices // see if they lie inside the hull shape of the other ship for(h in ourshape.hull) h = h.AddVector(offset) if(othershape.pointInShape(h)) hit = TRUE break if(hit) // we found a collision, blow up both ships explode() S.explode() del(S) del(src)[/code]" Checking out this demo for potential ideas in a space game. | |