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32 lines
824 B
32 lines
824 B
/**
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* Created by Alex on 2/23/2015.
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*/
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function CentralGravitySolver(body, options) {
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this.body = body;
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this.options = options;
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}
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CentralGravitySolver.prototype.solve = function () {
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var dx, dy, distance, node, i;
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var nodes = this.body.calculationNodes;
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var gravity = this.options.centralGravity;
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var gravityForce = 0;
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for (i = 0; i < this.body.calculationNodeIndices.length; i++) {
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node = nodes[this.body.calculationNodeIndices[i]];
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node.damping = this.options.damping; // possibly add function to alter damping properties of clusters.
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dx = -node.x;
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dy = -node.y;
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distance = Math.sqrt(dx * dx + dy * dy);
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gravityForce = (distance == 0) ? 0 : (gravity / distance);
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node.fx = dx * gravityForce;
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node.fy = dy * gravityForce;
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}
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};
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module.exports = CentralGravitySolver;
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