添加关照、全局等高线、修改图层问题

static/sdk/three/jsm/libs/potpack.module.js

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+/**
+ * potpack - by [@mourner](https://github.com/mourner)
+ * 
+ * A tiny JavaScript function for packing 2D rectangles into a near-square container, 
+ * which is useful for generating CSS sprites and WebGL textures. Similar to 
+ * [shelf-pack](https://github.com/mapbox/shelf-pack), but static (you can't add items 
+ * once a layout is generated), and aims for maximal space utilization.
+ *
+ * A variation of algorithms used in [rectpack2D](https://github.com/TeamHypersomnia/rectpack2D)
+ * and [bin-pack](https://github.com/bryanburgers/bin-pack), which are in turn based 
+ * on [this article by Blackpawn](http://blackpawn.com/texts/lightmaps/default.html).
+ * 
+ * @license
+ * ISC License
+ * 
+ * Copyright (c) 2018, Mapbox
+ * 
+ * Permission to use, copy, modify, and/or distribute this software for any purpose
+ * with or without fee is hereby granted, provided that the above copyright notice
+ * and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+ * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+ * THIS SOFTWARE.
+ */
+
+function potpack(boxes) {
+
+	// calculate total box area and maximum box width
+	let area = 0;
+	let maxWidth = 0;
+	
+	for (const box of boxes) {
+		area += box.w * box.h;
+		maxWidth = Math.max(maxWidth, box.w);
+	}
+	
+	// sort the boxes for insertion by height, descending
+	boxes.sort((a, b) => b.h - a.h);
+	
+	// aim for a squarish resulting container,
+	// slightly adjusted for sub-100% space utilization
+	const startWidth = Math.max(Math.ceil(Math.sqrt(area / 0.95)), maxWidth);
+	
+	// start with a single empty space, unbounded at the bottom
+	const spaces = [{x: 0, y: 0, w: startWidth, h: Infinity}];
+	
+	let width = 0;
+	let height = 0;
+	
+	for (const box of boxes) {
+		// look through spaces backwards so that we check smaller spaces first
+		for (let i = spaces.length - 1; i >= 0; i--) {
+			const space = spaces[i];
+			
+			// look for empty spaces that can accommodate the current box
+			if (box.w > space.w || box.h > space.h) continue;
+			
+			// found the space; add the box to its top-left corner
+			// |-------|-------|
+			// |  box  |       |
+			// |_______|       |
+			// |         space |
+			// |_______________|
+			box.x = space.x;
+			box.y = space.y;
+			
+			height = Math.max(height, box.y + box.h);
+			width = Math.max(width, box.x + box.w);
+			
+			if (box.w === space.w && box.h === space.h) {
+				// space matches the box exactly; remove it
+				const last = spaces.pop();
+				if (i < spaces.length) spaces[i] = last;
+			
+			} else if (box.h === space.h) {
+				// space matches the box height; update it accordingly
+				// |-------|---------------|
+				// |  box  | updated space |
+				// |_______|_______________|
+				space.x += box.w;
+				space.w -= box.w;
+			
+			} else if (box.w === space.w) {
+				// space matches the box width; update it accordingly
+				// |---------------|
+				// |      box      |
+				// |_______________|
+				// | updated space |
+				// |_______________|
+				space.y += box.h;
+				space.h -= box.h;
+			
+			} else {
+				// otherwise the box splits the space into two spaces
+				// |-------|-----------|
+				// |  box  | new space |
+				// |_______|___________|
+				// | updated space     |
+				// |___________________|
+				spaces.push({
+					x: space.x + box.w,
+					y: space.y,
+					w: space.w - box.w,
+					h: box.h
+				});
+				space.y += box.h;
+				space.h -= box.h;
+			}
+			break;
+		}
+	}
+	
+	return {
+		w: width, // container width
+		h: height, // container height
+		fill: (area / (width * height)) || 0 // space utilization
+	};
+}
+
+export { potpack };