mesh v2 at /v2/mesh

src2/geo/bounds.js

@@ -0,0 +1,133 @@
+/** Copyright 2014-2019 Stewart Allen -- All Rights Reserved */
+
+import { config, util } from './base.js';
+import { newPoint } from './point.js';
+
+export class Bounds {
+    constructor() {
+        this.minx = 10e7;
+        this.miny = 10e7;
+        this.maxx = -10e7;
+        this.maxy = -10e7;
+    }
+
+    set(minx, maxx, miny, maxy) {
+        this.minx = minx;
+        this.miny = miny;
+        this.maxx = maxx;
+        this.maxy = maxy;
+        return this;
+    }
+
+    clone() {
+        let b = new Bounds();
+        b.minx = this.minx;
+        b.miny = this.miny;
+        b.maxx = this.maxx;
+        b.maxy = this.maxy;
+        b.maxy = this.maxy;
+        return b;
+    }
+
+    equals(bounds, margin) {
+        if (!margin) margin = config.precision_offset;
+        return util.isCloseTo(this.minx, bounds.minx, margin) &&
+            util.isCloseTo(this.miny, bounds.miny, margin) &&
+            util.isCloseTo(this.maxx, bounds.maxx, margin) &&
+            util.isCloseTo(this.maxy, bounds.maxy, margin);
+    }
+
+    /**
+     * @returns {Number} absolute delta in x,y coordinate space
+     */
+    delta(bounds) {
+        return 0 +
+            Math.abs(this.minx - bounds.minx) +
+            Math.abs(this.miny - bounds.miny) +
+            Math.abs(this.maxx - bounds.maxx) +
+            Math.abs(this.maxy - bounds.maxy);
+    }
+
+    /**
+     * @param {Bounds} b
+     */
+    merge(b) {
+        this.minx = Math.min(this.minx, b.minx);
+        this.maxx = Math.max(this.maxx, b.maxx);
+        this.miny = Math.min(this.miny, b.miny);
+        this.maxy = Math.max(this.maxy, b.maxy);
+        return this;
+    }
+
+    /**
+     * @param {Point} p
+     */
+    update(p) {
+        this.minx = Math.min(this.minx, p.x);
+        this.maxx = Math.max(this.maxx, p.x);
+        this.miny = Math.min(this.miny, p.y);
+        this.maxy = Math.max(this.maxy, p.y);
+        return this;
+    }
+
+    contains(bounds) {
+        return bounds.isNested(this);
+    }
+
+    containsXY(x, y) {
+        return x >= this.minx && x <= this.maxx && y >= this.miny && y <= this.maxy;
+    }
+
+    containsOffsetXY(x, y, offset) {
+        return x >= this.minx - offset && x <= this.maxx + offset && y >= this.miny - offset && y <= this.maxy + offset;
+    }
+
+    /**
+     * @param {Bounds} parent
+     * @returns {boolean} true if fully inside parent bounds
+     */
+    isNested(parent, precision = config.precision_bounds) {
+        return (
+            this.minx >= parent.minx - precision && // min-x
+            this.maxx <= parent.maxx + precision && // max-x
+            this.miny >= parent.miny - precision && // min-y
+            this.maxy <= parent.maxy + precision // max-y
+        );
+    }
+
+    /**
+     * @param {Bounds} b
+     * @param {number} precision
+     * @returns {boolean}
+     */
+    overlaps(b, precision = config.precision_bounds) {
+        return (
+            Math.abs(this.centerx() - b.centerx()) * 2 - precision < this.width() + b.width() &&
+            Math.abs(this.centery() - b.centery()) * 2 - precision < this.height() + b.height()
+        );
+    }
+
+    width() {
+        return this.maxx - this.minx;
+    }
+
+    height() {
+        return this.maxy - this.miny;
+    }
+
+    center(z = 0) {
+        return newPoint(this.centerx(), this.centery(), z);
+    }
+
+    centerx() {
+        return this.minx + this.width() / 2;
+    }
+
+    centery() {
+        return this.miny + this.height() / 2;
+    }
+}
+
+export function newBounds() {
+    return new Bounds();
+}