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Allow arbor to deal with a single node. #29

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Allow arbor to deal with a single node. #29

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10 changes: 8 additions & 2 deletions src/physics/physics.js
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Original file line number Diff line number Diff line change
Expand Up @@ -205,6 +205,11 @@

applyBarnesHutRepulsion:function(){
if (!_bounds.topleft || !_bounds.bottomright) return
var nParticles = 0;
for (var particle in active.particles)
nParticles++;
if (nParticles < 2) return

var bottomright = new Point(_bounds.bottomright)
var topleft = new Point(_bounds.topleft)

Expand Down Expand Up @@ -248,7 +253,7 @@
numParticles++
});

if (numParticles==0) return
if (numParticles < 2) return

var correction = centroid.divide(-numParticles)
$.each(active.particles, function(id, point) {
Expand Down Expand Up @@ -314,7 +319,8 @@
});

_energy = {sum:sum, max:max, mean:sum/n, n:n}
_bounds = {topleft:topleft||new Point(-1,-1), bottomright:bottomright||new Point(1,1)}
if (n > 1)
_bounds = {topleft:topleft||new Point(-1,-1), bottomright:bottomright||new Point(1,1)}
},

systemEnergy:function(timestep){
Expand Down