mesh v2 at /v2/mesh

src2/geo/line.js

@@ -0,0 +1,56 @@
+/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
+
+export class Line {
+    constructor(p1, p2, key) {
+        if (!key) key = [p1.key, p2.key].join(';');
+        this.p1 = p1;
+        this.p2 = p2;
+        this.key = key;
+    }
+
+    length() {
+        return Math.sqrt(this.length2());
+    }
+
+    /**
+     * @returns {number} square of length
+     */
+    length2() {
+        return this.p1.distToSq2D(this.p2);
+    }
+
+    slope() {
+        return base.newSlope(this.p1.slopeTo(this.p2));
+    }
+
+    reverse() {
+        let t = this.p1;
+        this.p1 = this.p2;
+        this.p2 = t;
+        return this;
+    }
+
+    midpoint() {
+        return this.p1.midPointTo(this.p2);
+    }
+
+    isCollinear(line) {
+        let 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) ) < 0.0001;
+    }
+}
+
+export function newLine(p1, p2, key) {
+    return new Line(p1, p2, key);
+}
+
+export function newOrderedLine(p1, p2, key) {
+    return p1.key < p2.key ? newLine(p1,p2,key) : newLine(p2,p1,key);
+}