미디어위키:CategoryNav.js

/* =========================================
COASTLINE: BLACK ICE - CategoryNav
대문 카테고리 SVG 네비 생성기
========================================= */

/*
새 공통 기능에는 프로젝트 접두사를 사용하지 않는다.
window.CLBI.categoryNav는 기존 Common.js 호출과의 호환을 위해서만 유지한다.
*/

(function () {
    'use strict';

    var SVG_NS = 'http://www.w3.org/2000/svg';
    var XLINK_NS = 'http://www.w3.org/1999/xlink';

    var ITEMS = [
        { key: 'era', label: '시대', title: '시대' },
        { key: 'settings', label: '설정', title: '설정' },
        { key: 'project', label: '프로젝트', title: '프로젝트:소개' },
        { key: 'corporations', label: '기업 및 공동체', title: '기업_및_공동체' },
        { key: 'military', label: '군, 정치집단', title: '군_정치집단' }
    ];

    var BUTTON_GAP = 2;
    var OUTER_BORDER = 1;
    var INSET_LINE_OFFSET = 1.5;

    /* NEWS recent item height baseline: 36px. */

    function buildPath(title) {
        if (typeof window.buildWikiPath === 'function') {
            return window.buildWikiPath(title);
        }

        return '/index.php/' + encodeURI(String(title || '').replace(/ /g, '_'));
    }

    function readWidth(element) {
        if (!element) return 0;

        var rect = element.getBoundingClientRect ? element.getBoundingClientRect() : null;
        var width = rect ? Math.floor(rect.width || 0) : 0;

        if (!width && element.clientWidth) {
            width = Math.floor(element.clientWidth);
        }

        return width || 0;
    }

    function getRenderableWidth(nav, mount) {
        var candidates = [
            nav,
            mount,
            mount ? mount.parentElement : null,
            mount ? mount.closest('.main-portal') : null,
            document.querySelector('.liberty-content-main .mw-parser-output'),
            document.querySelector('.liberty-content-main'),
            document.querySelector('.liberty-content')
        ];

        for (var i = 0; i < candidates.length; i++) {
            var width = readWidth(candidates[i]);

            if (width > 0) return width;
        }

        if (document.documentElement && document.documentElement.clientWidth) {
            return Math.max(320, Math.floor(document.documentElement.clientWidth - 48));
        }

        return 1200;
    }

    function calculateGeometry(width) {
        var usableWidth = Math.max(320, Math.floor(width || 0));
        var count = ITEMS.length;
        var height = 36;
        var cut = Math.round((usableWidth / count) * 0.0675);
        var top = [];
        var bottom = [];
        var half = count / 2;
        var i;

        cut = Math.max(9, Math.min(15, cut));

        for (i = 0; i <= count; i++) {
            var x = Math.round((usableWidth * i) / count);

            if (i === 0 || i === count || i === half) {
                top.push(x);
                bottom.push(x);
            } else if (i < half) {
                top.push(x - cut);
                bottom.push(x);
            } else {
                top.push(x);
                bottom.push(x - cut);
            }
        }

        return {
            width: usableWidth,
            height: height,
            count: count,
            cut: cut,
            top: top,
            bottom: bottom,
            gap: BUTTON_GAP
        };
    }

    function createSvgElement(name) {
        return document.createElementNS(SVG_NS, name);
    }

    function roundCoordinate(value) {
        return Math.round(value * 100) / 100;
    }

    function pointsToString(points) {
        return points.map(function (point) {
            return roundCoordinate(point[0]) + ',' + roundCoordinate(point[1]);
        }).join(' ');
    }

    function getSegmentPoints(index, geometry) {
        var halfGap = geometry.gap / 2;
        var leftOffset = index === 0 ? 0 : halfGap;
        var rightOffset = index === geometry.count - 1 ? 0 : halfGap;

        return [
            [geometry.top[index] + leftOffset, 0],
            [geometry.top[index + 1] - rightOffset, 0],
            [geometry.bottom[index + 1] - rightOffset, geometry.height],
            [geometry.bottom[index] + leftOffset, geometry.height]
        ];
    }

    function getCentroid(points) {
        var totalX = 0;
        var totalY = 0;

        points.forEach(function (point) {
            totalX += point[0];
            totalY += point[1];
        });

        return [totalX / points.length, totalY / points.length];
    }

    function intersectLines(lineA, lineB) {
        var p = lineA.point;
        var r = lineA.direction;
        var q = lineB.point;
        var s = lineB.direction;
        var cross = r[0] * s[1] - r[1] * s[0];

        if (Math.abs(cross) < 0.000001) {
            return [p[0], p[1]];
        }

        var qMinusP = [q[0] - p[0], q[1] - p[1]];
        var t = (qMinusP[0] * s[1] - qMinusP[1] * s[0]) / cross;

        return [p[0] + t * r[0], p[1] + t * r[1]];
    }

    function insetPolygon(points, distance) {
        var center = getCentroid(points);
        var shiftedLines = [];
        var count = points.length;
        var i;

        for (i = 0; i < count; i++) {
            var start = points[i];
            var end = points[(i + 1) % count];
            var dx = end[0] - start[0];
            var dy = end[1] - start[1];
            var length = Math.sqrt(dx * dx + dy * dy) || 1;
            var normal = [-dy / length, dx / length];
            var midpoint = [(start[0] + end[0]) / 2, (start[1] + end[1]) / 2];
            var towardCenter = [center[0] - midpoint[0], center[1] - midpoint[1]];

            if (normal[0] * towardCenter[0] + normal[1] * towardCenter[1] < 0) {
                normal[0] *= -1;
                normal[1] *= -1;
            }

            shiftedLines.push({
                point: [
                    start[0] + normal[0] * distance,
                    start[1] + normal[1] * distance
                ],
                direction: [dx, dy]
            });
        }

        return shiftedLines.map(function (line, index) {
            var previous = shiftedLines[(index + count - 1) % count];
            return intersectLines(previous, line);
        });
    }

    function createPolygon(className, points) {
        var polygon = createSvgElement('polygon');
        polygon.setAttribute('class', className);
        polygon.setAttribute('points', pointsToString(points));
        return polygon;
    }

    function createEdgeLine(className, start, end) {
        var line = createSvgElement('line');

        line.setAttribute('class', className);
        line.setAttribute('x1', roundCoordinate(start[0]));
        line.setAttribute('y1', roundCoordinate(start[1]));
        line.setAttribute('x2', roundCoordinate(end[0]));
        line.setAttribute('y2', roundCoordinate(end[1]));
        line.setAttribute('vector-effect', 'non-scaling-stroke');
        line.setAttribute('pointer-events', 'none');

        return line;
    }

    function createSegment(item, index, geometry) {
        var anchor = createSvgElement('a');
        var outerPoints = getSegmentPoints(index, geometry);
        var surfacePoints = insetPolygon(outerPoints, OUTER_BORDER);
        var insetPoints = insetPolygon(outerPoints, INSET_LINE_OFFSET);
        var outer = createPolygon('portal-cat-edge', outerPoints);
        var surface = createPolygon('portal-cat-surface', surfacePoints);
        var topEdge = createEdgeLine('portal-cat-inset portal-cat-inset-top', insetPoints[0], insetPoints[1]);
        var rightEdge = createEdgeLine('portal-cat-inset portal-cat-inset-right', insetPoints[1], insetPoints[2]);
        var bottomEdge = createEdgeLine('portal-cat-inset portal-cat-inset-bottom', insetPoints[2], insetPoints[3]);
        var leftEdge = createEdgeLine('portal-cat-inset portal-cat-inset-left', insetPoints[3], insetPoints[0]);
        var hit = createPolygon('portal-cat-hit', outerPoints);
        var text = createSvgElement('text');
        var href = buildPath(item.title);
        var center = getCentroid(surfacePoints);

        anchor.setAttribute('class', 'portal-cat-anchor');
        anchor.setAttribute('href', href);
        anchor.setAttributeNS(XLINK_NS, 'xlink:href', href);
        anchor.setAttribute('aria-label', item.label);
        anchor.setAttribute('data-category-key', item.key);

        outer.setAttribute('pointer-events', 'none');
        surface.setAttribute('pointer-events', 'none');
        hit.setAttribute('pointer-events', 'all');

        text.setAttribute('class', 'portal-cat-label');
        text.setAttribute('x', Math.round(center[0]));
        text.setAttribute('y', Math.round(geometry.height / 2) + 1);
        text.setAttribute('font-size', '12');
        text.setAttribute('font-weight', '700');
        text.setAttribute('text-anchor', 'middle');
        text.setAttribute('dominant-baseline', 'middle');
        text.setAttribute('pointer-events', 'none');
        text.textContent = item.label;

        anchor.appendChild(outer);
        anchor.appendChild(surface);
        anchor.appendChild(topEdge);
        anchor.appendChild(rightEdge);
        anchor.appendChild(bottomEdge);
        anchor.appendChild(leftEdge);
        anchor.appendChild(hit);
        anchor.appendChild(text);

        return anchor;
    }

    function clearNode(node) {
        while (node.firstChild) node.removeChild(node.firstChild);
    }

    function buildSvg(width) {
        var geometry = calculateGeometry(width);
        var svg = createSvgElement('svg');

        svg.setAttribute('class', 'portal-category-svg');
        svg.setAttribute('viewBox', '0 0 ' + geometry.width + ' ' + geometry.height);
        svg.setAttribute('width', '100%');
        svg.setAttribute('height', '100%');
        svg.setAttribute('preserveAspectRatio', 'none');
        svg.setAttribute('aria-hidden', 'false');

        ITEMS.forEach(function (item, index) {
            svg.appendChild(createSegment(item, index, geometry));
        });

        return {
            svg: svg,
            key: geometry.width + '|' + geometry.height + '|' + geometry.cut + '|' + geometry.gap + '|' + ITEMS.length
        };
    }

    function renderSvgIntoNav(nav, mount) {
        var result = buildSvg(getRenderableWidth(nav, mount));

        if (nav.__categoryNavRenderKey === result.key && nav.querySelector('svg')) return;

        nav.__categoryNavRenderKey = result.key;
        clearNode(nav);
        nav.appendChild(result.svg);
    }

    function scheduleRender(nav, mount) {
        if (!nav || nav.__categoryNavFrame) return;

        nav.__categoryNavFrame = window.requestAnimationFrame(function () {
            nav.__categoryNavFrame = null;
            renderSvgIntoNav(nav, mount);
        });
    }

    function renderCategoryNavMount(mount) {
        if (!mount) return;

        if (mount.__categoryNavObserver) {
            mount.__categoryNavObserver.disconnect();
            mount.__categoryNavObserver = null;
        }

        clearNode(mount);

        var nav = document.createElement('nav');
        nav.className = 'portal-category-nav';
        nav.setAttribute('aria-label', 'Main categories');

        mount.appendChild(nav);
        mount.setAttribute('data-category-nav-rendered', '1');

        scheduleRender(nav, mount);
        window.setTimeout(function () { scheduleRender(nav, mount); }, 80);
        window.setTimeout(function () { scheduleRender(nav, mount); }, 250);

        if (window.ResizeObserver) {
            var observer = new ResizeObserver(function () {
                scheduleRender(nav, mount);
            });

            observer.observe(mount);
            observer.observe(nav);
            mount.__categoryNavObserver = observer;
        } else {
            window.addEventListener('resize', function () {
                scheduleRender(nav, mount);
            });
        }
    }

    function renderAllCategoryNavs(root) {
        var scope = root || document;
        var mounts = scope.querySelectorAll('[data-component="category-nav"]');

        Array.prototype.forEach.call(mounts, function (mount) {
            renderCategoryNavMount(mount);
        });
    }

    window.CLBI = window.CLBI || {};
    window.CLBI.categoryNav = {
        init: renderAllCategoryNavs,
        renderMount: renderCategoryNavMount
    };

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', function () {
            renderAllCategoryNavs(document);
        });
    } else {
        renderAllCategoryNavs(document);
    }

    if (window.mw && mw.hook) {
        mw.hook('wikipage.content').add(function ($content) {
            var root = $content && $content[0] ? $content[0] : document;
            renderAllCategoryNavs(root);
        });
    }
}());