initial commit

js/geo-line.js

@@ -0,0 +1,114 @@
+"use strict";
+
+var gs_base_line = {
+    copyright:"stewart allen <stewart@neuron.com> -- all rights reserved"
+};
+
+(function() {
+
+    if (!self.base) self.base = {};
+    if (self.base.Line) return;
+
+    /**
+     *
+     * @param {Point} p1
+     * @param {Point} p2
+     * @param {String} [key]
+     * @constructor
+     */
+    function Line(p1, p2, key) {
+        if (!key) key = [p1.key, p2.key].join('-');
+        this.p1 = p1;
+        this.p2 = p2;
+        this.key = key;
+        this.coplanar = false;
+        this.edge = false;
+        this.del = false;
+    }
+
+    var    BASE = self.base,
+        LiP = Line.prototype;
+
+    BASE.Line = Line;
+    BASE.newLine = newLine;
+    BASE.newOrderedLine = newOrderedLine;
+
+    /** ******************************************************************
+     * Line Prototype Functions
+     ******************************************************************* */
+
+    /**
+     * @returns {number}
+     */
+    LiP.length = function() {
+        return Math.sqrt(this.length2());
+    };
+
+    /**
+     * @returns {number} square of length
+     */
+    LiP.length2 = function() {
+        return this.p1.distToSq2D(this.p2);
+    };
+
+    /**
+     * @returns {Slope}
+     */
+    LiP.slope = function() {
+        return BASE.newSlope(this.p1.slopeTo(this.p2));
+    };
+
+    /**
+     * @returns {Line}
+     */
+    LiP.reverse = function() {
+        var t = this.p1;
+        this.p1 = this.p2;
+        this.p2 = t;
+        return this;
+    };
+
+    /**
+     * @returns {Point}
+     */
+    LiP.midpoint = function() {
+        return this.p1.midPointTo(this.p2);
+    };
+
+    /**
+     * @param {Line} line
+     * @returns {boolean}
+     */
+    LiP.isCollinear = function(line) {
+        var p1 = this.p1,
+            p2 = this.p2,
+            p3 = line.p1,
+            p4 = line.p2,
+            d1x = (p2.x - p1.x),
+            d1y = (p2.y - p1.y),
+            d2x = (p4.x - p3.x),
+            d2y = (p4.y - p3.y);
+
+        return Math.abs( (d2y * d1x) - (d2x * d1y) ) < 0.000001;
+    };
+
+    /** ******************************************************************
+     * Connect to base and Helpers
+     ******************************************************************* */
+
+    /**
+     *
+     * @param {Point} p1
+     * @param {Point} p2
+     * @param {String} [key]
+     * @returns {Line}
+     */
+    function newLine(p1, p2, key) {
+        return new Line(p1, p2, key);
+    }
+
+    function newOrderedLine(p1, p2, key) {
+        return p1.key < p2.key ? newLine(p1,p2,key) : newLine(p2,p1,key);
+    }
+
+})();