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add maxSpeed parameter to Layout.ForceDirected constructor

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This commit is contained in:
mwcz 2016-07-19 14:38:01 -04:00
parent 559a400331
commit e490969ea0
1 changed files with 5 additions and 1 deletions
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6
springy.js
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@ -327,12 +327,13 @@
// -----------
var Layout = Springy.Layout = {};
Layout.ForceDirected = function(graph, stiffness, repulsion, damping, minEnergyThreshold) {
Layout.ForceDirected = function(graph, stiffness, repulsion, damping, minEnergyThreshold, maxSpeed) {
this.graph = graph;
this.stiffness = stiffness; // spring stiffness constant
this.repulsion = repulsion; // repulsion constant
this.damping = damping; // velocity damping factor
this.minEnergyThreshold = minEnergyThreshold || 0.01; //threshold used to determine render stop
this.maxSpeed = maxSpeed || Infinity; // nodes aren't allowed to exceed this speed
this.nodePoints = {}; // keep track of points associated with nodes
this.edgeSprings = {}; // keep track of springs associated with edges
@ -451,6 +452,9 @@
// Is this, along with updatePosition below, the only places that your
// integration code exist?
point.v = point.v.add(point.a.multiply(timestep)).multiply(this.damping);
if (point.v.magnitude() > this.maxSpeed) {
point.v = point.v.normalise().multiply(this.maxSpeed);
}
point.a = new Vector(0,0);
});
};