node_modules/potpack/index.js - master - mastercond/CascadeStudio

node_modules/potpack/index.js
124 строки4 KB
Johnathon Selstad
Atlas the UVs into a Proper UV Map with potpack
06 мар 2021, 03:29
06 мар 2021, 03:299789e69
/*
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 (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define(factory) :
(global.potpack = factory());
}(this, (function () { 'use strict';

function potpack(boxes) {

    // calculate total box area and maximum box width
    var area = 0;
    var maxWidth = 0;

    for (var i$1 = 0, list = boxes; i$1 < list.length; i$1 += 1) {
        var box = list[i$1];

        area += box.w * box.h;
        maxWidth = Math.max(maxWidth, box.w);
    }

    // sort the boxes for insertion by height, descending
    boxes.sort(function (a, b) { return b.h - a.h; });

    // aim for a squarish resulting container,
    // slightly adjusted for sub-100% space utilization
    var startWidth = Math.max(Math.ceil(Math.sqrt(area / 0.95)), maxWidth);

    // start with a single empty space, unbounded at the bottom
    var spaces = [{x: 0, y: 0, w: startWidth, h: Infinity}];

    var width = 0;
    var height = 0;

    for (var i$2 = 0, list$1 = boxes; i$2 < list$1.length; i$2 += 1) {
        // look through spaces backwards so that we check smaller spaces first
        var box$1 = list$1[i$2];

        for (var i = spaces.length - 1; i >= 0; i--) {
            var space = spaces[i];

            // look for empty spaces that can accommodate the current box
            if (box$1.w > space.w || box$1.h > space.h) { continue; }

            // found the space; add the box to its top-left corner
            // |-------|-------|
            // |  box  |       |
            // |_______|       |
            // |         space |
            // |_______________|
            box$1.x = space.x;
            box$1.y = space.y;

            height = Math.max(height, box$1.y + box$1.h);
            width = Math.max(width, box$1.x + box$1.w);

            if (box$1.w === space.w && box$1.h === space.h) {
                // space matches the box exactly; remove it
                var last = spaces.pop();
                if (i < spaces.length) { spaces[i] = last; }

            } else if (box$1.h === space.h) {
                // space matches the box height; update it accordingly
                // |-------|---------------|
                // |  box  | updated space |
                // |_______|_______________|
                space.x += box$1.w;
                space.w -= box$1.w;

            } else if (box$1.w === space.w) {
                // space matches the box width; update it accordingly
                // |---------------|
                // |      box      |
                // |_______________|
                // | updated space |
                // |_______________|
                space.y += box$1.h;
                space.h -= box$1.h;

            } else {
                // otherwise the box splits the space into two spaces
                // |-------|-----------|
                // |  box  | new space |
                // |_______|___________|
                // | updated space     |
                // |___________________|
                spaces.push({
                    x: space.x + box$1.w,
                    y: space.y,
                    w: space.w - box$1.w,
                    h: box$1.h
                });
                space.y += box$1.h;
                space.h -= box$1.h;
            }
            break;
        }
    }

    return {
        w: width, // container width
        h: height, // container height
        fill: (area / (width * height)) || 0 // space utilization
    };
}

return potpack;

})));