Leaflet.tiledImageOverlay

Leaflet插件，实现单图的瓦片形式加载，缩放不切换层级
a Leaflet plugin providing a layer extended from L.LayerGroup.
it can be used to show a single zoom tileLayer, you can zoom in and out.

why this

高分辨率图片 在移动端浏览器比如微信浏览器中有时候会显示不出来 ，于是L.imageOverlay满足不了需要
a high resolution pic will not show in some moblie phones from time to time using L.imageOverlay.

demo

click me

requirements

• Leaflet 版本: 不小于1.0.0
• Leaflet version: above 1.0.0
• 无其他外部依赖
• no other external dependencies

usage

在leafet脚本加载之后加载L.tiledImageOverlay即可
just import script L.tiledImageOverlay after leaflet

use with options.tileUrl

const map = L.map(...args);
const options = {
    tileUrl: 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
    z: 13, // 某一层级， 可以考虑不传，那么tileUrl中也不要留z的位置
    startX: 4091, // 横向
    startY: 2723, // 竖向
    row: 4,
    col: 4,
    leftTop: [0, 0], // latlng
    // rightBottom: [-10, 10], // latlng, required when map crs is not L.CRS.Simple
    blockSize: 64, // 单个瓦片显示在手机屏幕上的尺寸，与实际瓦片大小无关
    autoFit: true,
    onAutoFit: function ({ minZoom, z, maxZoom, center, maxBounds }) {
        console.log('custom init here...');
        map.setView(center, z);
        map.setMaxBounds(maxBounds);
        map.setMinZoom(minZoom);
        map.setMaxZoom(maxZoom);
    },
    // debug: true,
};
L.tileImageOverlay(options).addTo(map);

u can also use with use with options.images or options.image, check files docs/demo-images.html and docs/demo-image.html

example

see docs/index.html

options

options.tileUrl

一个url模板字符串，用来结合x,y,z为每个瓦片拼出一个完整的图片地址, 和参数startX, startY, col, row, z配合使用
a url pattern to build an image url for per tile, working withstartX, startY, col, row, z

options.startX, options.col

决定tileUrl中x的取值: [options.startX, options.startX+options.col]
determine the range of x in tileUrl: [options.startX, options.startX+options.col]

options.startY, options.row

决定tileUrl中y的取值: [options.startY, options.startY+options.row]
determine the range of y in tileUrl: [options.startY, options.startY+options.row]

options.z

可选，如果tileUrl中有z，则需要传入此参数
only required when the tileUrl contains z

options.blockSize

单位是像素，每个瓦片实际上是一个L.imageOverlay，blockSize为其宽高
unit: px, the size of each tile as a L.imageOverlay

options.width, options.height

单位是像素，决定整个大图的宽高, 如果不传默认width=blockSize*col,height=blockSize*row
unit: px, the size of the big image, use width=blockSize*col,height=blockSize*row if omitted

options.leftTop

左上角坐标，默认[0,0]
leftTop corner latlng, default is [0, 0]

options.rightBottom

右下角坐标。 地图的crs 不是 L.CRS.Simple的时候需要设定，如果不设定将会使用options.leftTop和options.width, options.height算出options.rightBottom
rightBottom corner latlng, required when map crs is not L.CRS.Simple, will be calculated with options.leftTop and options.width, options.height if omitted

options.autoFit, options.onAutoFit

autoFit为真则地图会自动缩放至最合适层级(根据当前窗口大小和大图大小)，并限制最大最小层级和最大边界， 若需自定义则传入onAutoFit，接收参数为推荐层级和边界({minZoom, z, maxZoom, center, maxBounds})
if autoFit is true, the map will auto fixbounds , set min and max zoom, and set maxbounds. if u dont like it, use onAutoFit to do your logic with your map, which accept recommended args like {minZoom, z, maxZoom, center, maxBounds}

options.images

一个包含所有(用到的)瓦片地址的数组
an array of url string
e.g. [row1col1,row1col2,...,row2col1,...]
如果你不喜欢tileUrl，可以使用images，row，col组合来决定所有的瓦片来源
if u dont like tileUrl, u can use images, row, col

options.image (type: Image)

只要一张图 just one single image 如果你也不喜欢images,可以使用image，blockSize组合，将自动将大图切片，然后使用canvas呈现出来
注意需要额外引入L.canvasOverlay.min.js, 而且你需要在image加载完成之后传入，见docs/demo-image.html
if u dont like images either, u can use image, blockSize, the image will be cut into pieces according to blockSize and show in canvas
attention: u should import L.canvasOverlay.min.js before using opt.image, and u need to call L.tiledImageOverlay after your image is loaded, see docs/demo-image.html for details

dev

just run gulp