114 lines
2.5 KiB
JavaScript
114 lines
2.5 KiB
JavaScript
"use strict";
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var gs_base_line = {
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copyright:"stewart allen <stewart@neuron.com> -- all rights reserved"
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};
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(function() {
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if (!self.base) self.base = {};
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if (self.base.Line) return;
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/**
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*
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* @param {Point} p1
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* @param {Point} p2
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* @param {String} [key]
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* @constructor
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*/
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function Line(p1, p2, key) {
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if (!key) key = [p1.key, p2.key].join('-');
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this.p1 = p1;
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this.p2 = p2;
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this.key = key;
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this.coplanar = false;
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this.edge = false;
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this.del = false;
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}
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var BASE = self.base,
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LiP = Line.prototype;
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BASE.Line = Line;
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BASE.newLine = newLine;
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BASE.newOrderedLine = newOrderedLine;
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/** ******************************************************************
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* Line Prototype Functions
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******************************************************************* */
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/**
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* @returns {number}
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*/
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LiP.length = function() {
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return Math.sqrt(this.length2());
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};
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/**
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* @returns {number} square of length
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*/
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LiP.length2 = function() {
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return this.p1.distToSq2D(this.p2);
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};
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/**
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* @returns {Slope}
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*/
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LiP.slope = function() {
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return BASE.newSlope(this.p1.slopeTo(this.p2));
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};
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/**
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* @returns {Line}
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*/
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LiP.reverse = function() {
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var t = this.p1;
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this.p1 = this.p2;
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this.p2 = t;
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return this;
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};
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/**
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* @returns {Point}
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*/
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LiP.midpoint = function() {
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return this.p1.midPointTo(this.p2);
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};
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/**
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* @param {Line} line
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* @returns {boolean}
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*/
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LiP.isCollinear = function(line) {
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var p1 = this.p1,
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p2 = this.p2,
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p3 = line.p1,
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p4 = line.p2,
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d1x = (p2.x - p1.x),
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d1y = (p2.y - p1.y),
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d2x = (p4.x - p3.x),
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d2y = (p4.y - p3.y);
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return Math.abs( (d2y * d1x) - (d2x * d1y) ) < 0.000001;
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};
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/** ******************************************************************
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* Connect to base and Helpers
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******************************************************************* */
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/**
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*
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* @param {Point} p1
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* @param {Point} p2
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* @param {String} [key]
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* @returns {Line}
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*/
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function newLine(p1, p2, key) {
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return new Line(p1, p2, key);
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}
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function newOrderedLine(p1, p2, key) {
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return p1.key < p2.key ? newLine(p1,p2,key) : newLine(p2,p1,key);
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}
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})();
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