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Merge pull request #85 from mwcz/max-speed

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add maxSpeed parameter to Layout.ForceDirected constructor
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Dennis Hotson 2016-12-29 10:22:56 +11:00 committed by GitHub
commit 6158298c9e
1 changed files with 5 additions and 1 deletions
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springy.js
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@ -327,12 +327,13 @@
// ----------- // -----------
var Layout = Springy.Layout = {}; 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.graph = graph;
this.stiffness = stiffness; // spring stiffness constant this.stiffness = stiffness; // spring stiffness constant
this.repulsion = repulsion; // repulsion constant this.repulsion = repulsion; // repulsion constant
this.damping = damping; // velocity damping factor this.damping = damping; // velocity damping factor
this.minEnergyThreshold = minEnergyThreshold || 0.01; //threshold used to determine render stop 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.nodePoints = {}; // keep track of points associated with nodes
this.edgeSprings = {}; // keep track of springs associated with edges this.edgeSprings = {}; // keep track of springs associated with edges
@ -451,6 +452,9 @@
// Is this, along with updatePosition below, the only places that your // Is this, along with updatePosition below, the only places that your
// integration code exist? // integration code exist?
point.v = point.v.add(point.a.multiply(timestep)).multiply(this.damping); 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); point.a = new Vector(0,0);
}); });
}; };