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96 lines
2.4 KiB
96 lines
2.4 KiB
export default class Quad {
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constructor(params) {
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/**
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* the center position of this quad
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* @type {number}
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*/
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this.xmid = params.xmid;
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/**
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* the center position of this quad
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* @type {number}
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*/
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this.ymid = params.ymid;
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/**
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* the length of this quad
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* @type {number}
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*/
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this.length = params.length;
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/**
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* the mass center of this quad
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* @type {number}
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*/
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this.massCenter = params.massCenter || [0, 0];
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/**
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* the mass of this quad
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* @type {number}
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*/
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this.mass = params.mass || 1;
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}
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getLength() {
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return this.length;
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}
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contains(x, y) {
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const halfLen = this.length / 2;
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return (x <= this.xmid + halfLen &&
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x >= this.xmid - halfLen &&
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y <= this.ymid + halfLen &&
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y >= this.ymid - halfLen);
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}
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// northwest quadrant
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// tslint:disable-next-line
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NW() {
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const x = this.xmid - this.length / 4;
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const y = this.ymid + this.length / 4;
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const len = this.length / 2;
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const params = {
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xmid: x,
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ymid: y,
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length: len,
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};
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const NW = new Quad(params);
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return NW;
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}
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// northeast
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// tslint:disable-next-line
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NE() {
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const x = this.xmid + this.length / 4;
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const y = this.ymid + this.length / 4;
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const len = this.length / 2;
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const params = {
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xmid: x,
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ymid: y,
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length: len,
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};
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const NE = new Quad(params);
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return NE;
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}
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// southwest
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// tslint:disable-next-line
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SW() {
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const x = this.xmid - this.length / 4;
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const y = this.ymid - this.length / 4;
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const len = this.length / 2;
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const params = {
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xmid: x,
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ymid: y,
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length: len,
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};
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const SW = new Quad(params);
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return SW;
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}
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// southeast
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// tslint:disable-next-line
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SE() {
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const x = this.xmid + this.length / 4;
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const y = this.ymid - this.length / 4;
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const len = this.length / 2;
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const params = {
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xmid: x,
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ymid: y,
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length: len,
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};
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const SE = new Quad(params);
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return SE;
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}
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}
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//# sourceMappingURL=quad.js.map
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