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TileStitcher class (anti-gap TileLayer)
Signed-off-by: Iván Sánchez Ortega <ivan@sanchezortega.es>
This commit is contained in:
Iván Sánchez Ortega
204
debug/tests/tile-stitcher.html
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204
debug/tests/tile-stitcher.html
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<!doctype html>
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<html>
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<head>
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<meta charset="utf-8" />
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<title>Leaflet debug page - Tile Events</title>
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<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=0" />
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<link rel="stylesheet" href="../../dist/leaflet.css" />
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<link rel="stylesheet" href="../css/screen.css" />
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<style>
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#map {
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margin: 0;
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width: auto;
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}
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.redTile {
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border: red 1px solid;
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line-height: 256px;
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text-align: center;
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}
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table {
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border-collapse: collapse;
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}
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table th,
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table td {
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border: 1px #444 solid;
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margin: 0;
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}
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</style>
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<script type="importmap">
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{
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"imports": {
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"leaflet": "../../dist/leaflet-src.js"
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}
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}
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</script>
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</head>
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<body>
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<p>
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Keep track of how many tileload/tileunload events are being fired. The
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counts should always match. See
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<a href="https://github.com/Leaflet/Leaflet/issues/4093">#4093</a>,
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<a href="https://github.com/Leaflet/Leaflet/issues/4193">#4193</a>
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</p>
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<div id="map"></div>
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<table>
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<tr>
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<th></th>
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<th>Start</th>
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<th>Load</th>
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<th>Error</th>
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<th>Unload</th>
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<th>Visible</th>
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<th>
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Grid load
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<tr>
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<th>Grid</th>
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<td id="grid-tileloadstart"></td>
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<td id="grid-tileload"></td>
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<td id="grid-tileerror"></td>
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<td id="grid-tileunload"></td>
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<td id="grid-visible"></td>
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<td id="grid-load">
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<tr>
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<th>Positron</th>
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<td id="positron-tileloadstart"></td>
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<td id="positron-tileload"></td>
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<td id="positron-tileerror"></td>
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<td id="positron-tileunload"></td>
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<td id="positron-visible"></td>
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<td id="positron-load"></td>
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</tr>
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</td>
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</tr>
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</th>
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</tr>
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</table>
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<p>start = unload + visible on screen</p>
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<div><button id="dc">DC</button>(flyTo)</div>
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<div><button id="sf">SF</button>(setView, 5 sec)</div>
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<div><button id="trd">TRD</button>(flyTo 20 sec)</div>
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<div><button id="lnd">LND</button>(fract. zoom)</div>
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<div><button id="kyiv">KIEV</button>(setView, fract. zoom)</div>
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<div><button id="mad">MAD</button>(fitBounds)</div>
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<div><button id="nul">NUL</button>(image overlay)</div>
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<div><button id="stop">stop</button></div>
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<script type="module">
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import {Map, TileStitcher, TileLayer, GridLayer, Point, DomUtil} from 'leaflet';
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const kyiv = [50.5, 30.5];
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const lnd = [51.51, -0.12];
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const sf = [37.77, -122.42];
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const dc = [38.91, -77.04];
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const trd = [63.41, 10.41];
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const madBounds = [
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[40.7, -4.19],
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[40.12, -3.31],
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];
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const map = new Map('map', {
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center: [35, -122],
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zoom: 5.75,
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// zoom: 5,
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zoomSnap: 0.25,
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fadeAnimation: true,
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});
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const positron = new TileLayer('https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png');
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const grid = window.grid = new TileStitcher({
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attribution: 'Grid Layer',
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// tileSize: new Point(150, 80)
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tileSize: new Point(256, 256),
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zIndex: 5,
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});
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grid.createTile = function(coords, done) {
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var canvas = document.createElement('canvas');
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var tileSize = grid.getTileSize();
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canvas.setAttribute('width', tileSize.x);
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canvas.setAttribute('height', tileSize.y);
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var ctx = canvas.getContext('2d');
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ctx.fillStyle = 'rgba(245,245,220,0.3)';
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ctx.fillRect(0, 0, tileSize.x, tileSize.y);
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ctx.strokeStyle = 'green';
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ctx.fillStyle = 'green';
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ctx.strokeRect(2, 2, tileSize.x - 4, tileSize.y - 4);
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ctx.font = (tileSize.x / 10) + "px Sans"
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ctx.fillText( coords.x + "," + coords.y + "," + coords.z,
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tileSize.x / 4 + Math.random() * 10,
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tileSize.y * 3/4 + Math.random() * 10);
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// return canvas.toDataURL();
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setTimeout(()=>{done(null, canvas)}, Math.random() * 500);
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return canvas;
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};
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const gridCounts = {
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tileload: 0,
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tileerror: 0,
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tileloadstart: 0,
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tileunload: 0,
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load: 0,
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};
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const positronCounts = {
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tileload: 0,
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tileerror: 0,
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tileloadstart: 0,
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tileunload: 0,
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load: 0,
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};
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grid.on('tileerror', (ev) => {
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debugger;
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});
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grid.on('tileload tileunload tileerror tileloadstart load', (ev) => {
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document.getElementById(`grid-${ev.type}`).innerHTML = ++gridCounts[ev.type];
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document.getElementById('grid-visible').innerHTML = grid._container.querySelectorAll('.leaflet-tile').length;
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});
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positron.on('tileload tileunload tileerror tileloadstart load', (ev) => {
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document.getElementById(`positron-${ev.type}`).innerHTML = ++positronCounts[ev.type];
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document.getElementById('positron-visible').innerHTML = positron._container.querySelectorAll('.leaflet-tile').length;
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});
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map.addLayer(positron);
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map.addLayer(grid);
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document.getElementById('dc').onclick = function () {
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map.flyTo(dc, 10);
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};
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document.getElementById('sf').onclick = function () {
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map.setView(sf, 10, {duration: 5, animate: true});
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};
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document.getElementById('trd').onclick = function () {
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map.flyTo(trd, 10, {duration: 20});
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};
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document.getElementById('lnd').onclick = function () {
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map.flyTo(lnd, 9.25);
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};
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document.getElementById('kyiv').onclick = function () {
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map.setView(kyiv, 9.25);
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};
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document.getElementById('nul').onclick = function () {
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map.flyTo([0, 0], 10);
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};
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document.getElementById('mad').onclick = function () {
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map.fitBounds(madBounds);
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};
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document.getElementById('stop').onclick = function () {
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map.stop();
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};
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</script>
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</body>
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</html>
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235
src/layer/tile/TileStitcher.js
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235
src/layer/tile/TileStitcher.js
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import {GridLayer} from './GridLayer.js';
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import {TileLayer} from './TileLayer.js';
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import * as DomUtil from '../../dom/DomUtil.js';
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import {Point} from '../../geometry/Point.js';
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import {Bounds} from '../../geometry/Bounds.js';
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import Browser from '../../core/Browser.js';
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/*
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* @class TileStitcher
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* @inherits TileLayer
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*
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* Works as `TileLayer`, but implements logic to avoid [1-px gaps between tiles](https://github.com/Leaflet/Leaflet/issues/3575).
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*
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* Tiles are internally stitched into a 2D canvas (one such canvas per zoom level).
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*/
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export const TileStitcher = TileLayer.extend({
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_onUpdateLevel(z, zoom) {
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this._levels[z].canvas.style.zIndex = this.options.maxZoom - Math.abs(zoom - z);
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},
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_onRemoveLevel(z) {
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this._levels[z].canvas.remove();
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},
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_onCreateLevel(level) {
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level.canvas = DomUtil.create(
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'canvas',
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'leaflet-tile-container leaflet-zoom-animated',
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this._container
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);
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level.ctx = level.canvas.getContext('2d');
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this._resetCanvasSize(level);
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},
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_removeTile(key) {
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const tile = this._tiles[key],
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level = this._levels[tile.coords.z],
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tileSize = this.getTileSize();
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if (level) {
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// Where in the canvas should this tile go?
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const offset = new Point(tile.coords.x, tile.coords.y)
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.subtract(level.canvasRange.min)
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.scaleBy(this.getTileSize());
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level.ctx.clearRect(offset.x, offset.y, tileSize.x, tileSize.y);
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}
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GridLayer.prototype._removeTile.call(this, key);
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},
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_resetCanvasSize(level) {
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const buff = this.options.keepBuffer,
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pixelBounds = this._getTiledPixelBounds(this._map.getCenter()),
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tileRange = this._pxBoundsToTileRange(pixelBounds),
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tileSize = this.getTileSize();
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tileRange.min = tileRange.min.subtract([buff, buff]); // This adds the no-prune buffer
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tileRange.max = tileRange.max.add([buff + 1, buff + 1]);
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const pixelRange = new Bounds(
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tileRange.min.scaleBy(tileSize),
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tileRange.max.add([1, 1]).scaleBy(tileSize) // This prevents an off-by-one when checking if tiles are inside
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),
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neededSize = pixelRange.max.subtract(pixelRange.min);
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let mustRepositionCanvas = false;
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// Resize the canvas, if needed, and only to make it bigger.
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if (
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neededSize.x > level.canvas.width ||
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neededSize.y > level.canvas.height
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) {
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// Resizing canvases erases the currently drawn content, I'm afraid.
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// To keep it, dump the pixels to another canvas, then display it on
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// top. This could be done with getImageData/putImageData, but that
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// would break for tainted canvases (in non-CORS tilesets)
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const oldSize = {x: level.canvas.width, y: level.canvas.height};
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// console.info('Resizing canvas from ', oldSize, 'to ', neededSize);
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const tmpCanvas = DomUtil.create('canvas');
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tmpCanvas.style.width = `${tmpCanvas.width = oldSize.x }px`;
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tmpCanvas.style.height = `${tmpCanvas.height = oldSize.y }px`;
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tmpCanvas.getContext('2d').drawImage(level.canvas, 0, 0);
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// var data = level.ctx.getImageData(0, 0, oldSize.x, oldSize.y);
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level.canvas.style.width = `${level.canvas.width = neededSize.x }px`;
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level.canvas.style.height = `${level.canvas.height = neededSize.y }px`;
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level.ctx.drawImage(tmpCanvas, 0, 0);
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// level.ctx.putImageData(data, 0, 0, 0, 0, oldSize.x, oldSize.y);
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}
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// Translate the canvas contents if it's moved around
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if (level.canvasRange) {
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const offset = level.canvasRange.min
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.subtract(tileRange.min)
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.scaleBy(this.getTileSize());
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// console.info('Offsetting by ', offset);
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if (!Browser.safari) {
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// By default, canvases copy things "on top of" existing pixels, but we want
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// this to *replace* the existing pixels when doing a drawImage() call.
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// This will also clear the sides, so no clearRect() calls are needed to make room
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// for the new tiles.
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level.ctx.globalCompositeOperation = 'copy';
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level.ctx.drawImage(level.canvas, offset.x, offset.y);
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level.ctx.globalCompositeOperation = 'source-over';
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} else {
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// Safari clears the canvas when copying from itself :-(
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if (!this._tmpCanvas) {
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const t = (this._tmpCanvas = DomUtil.create('canvas'));
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t.width = level.canvas.width;
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t.height = level.canvas.height;
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this._tmpContext = t.getContext('2d');
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}
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this._tmpContext.clearRect(
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0,
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0,
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level.canvas.width,
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level.canvas.height
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);
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this._tmpContext.drawImage(level.canvas, 0, 0);
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level.ctx.clearRect(0, 0, level.canvas.width, level.canvas.height);
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level.ctx.drawImage(this._tmpCanvas, offset.x, offset.y);
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}
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mustRepositionCanvas = true; // Wait until new properties are set
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}
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level.canvasRange = tileRange;
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level.canvasPxRange = pixelRange;
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level.canvasOrigin = pixelRange.min;
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// console.log('Canvas tile range: ', level, tileRange.min, tileRange.max );
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// console.log('Canvas pixel range: ', pixelRange.min, pixelRange.max );
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// console.log('Level origin: ', level.origin );
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if (mustRepositionCanvas) {
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this._setCanvasZoomTransform(
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level,
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this._map.getCenter(),
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this._map.getZoom()
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);
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}
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},
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// / set transform/position of canvas, in addition to the transform/position of the individual tile container
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_setZoomTransform(level, center, zoom) {
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TileLayer.prototype._setZoomTransform.call(this, level, center, zoom);
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if (level.canvas) {
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this._setCanvasZoomTransform(level, center, zoom);
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}
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},
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// This will get called twice:
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// * From _setZoomTransform
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// * When the canvas has shifted due to a new tile being loaded
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_setCanvasZoomTransform(level, center, zoom) {
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const scale = this._map.getZoomScale(zoom, level.zoom),
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translate = level.canvasOrigin
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.multiplyBy(scale)
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.subtract(this._map._getNewPixelOrigin(center, zoom))
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.round();
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DomUtil.setTransform(level.canvas, translate, scale);
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},
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_onOpaqueTile(tile) {
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// Guard against an NS_ERROR_NOT_AVAILABLE (or similar) exception
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// when a non-image-tile has been loaded (e.g. a WMS error).
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// Checking for tile.el.complete is not enough, as it has been
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// already marked as loaded and ready somehow.
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try {
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this.dumpPixels(tile.coords, tile.el);
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} catch (ex) {
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return this.fire('tileerror', {
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error: `Could not copy tile pixels: ${ ex}`,
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tile,
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coods: tile.coords,
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});
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}
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// If dumping the pixels was successful, then hide the tile.
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// Do not remove the tile itself, as it is needed to check if the whole
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// level (and its canvas) should be removed (via level.el.children.length)
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tile.el.style.display = 'none';
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},
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// @section Extension methods
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// @uninheritable
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// @method dumpPixels(coords: Object, imageSource: CanvasImageSource): this
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// Dumps pixels from the given `CanvasImageSource` into the layer, into
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// the space for the tile represented by the `coords` tile coordinates (an object
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// like `{x: Number, y: Number, z: Number}`; the image source must have the
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// same size as the `tileSize` option for the layer.
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dumpPixels(coords, imageSource) {
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const level = this._levels[coords.z],
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tileSize = this.getTileSize();
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if (!level.canvasRange) {
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return;
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}
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// Check if the tile is inside the currently visible map bounds
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// There is a possible race condition when tiles are loaded after they
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// have been panned outside of the map.
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if (!level.canvasRange.contains(coords)) {
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this._resetCanvasSize(level);
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}
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// Where in the canvas should this tile go?
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const offset = new Point(coords.x, coords.y)
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.subtract(level.canvasRange.min)
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.scaleBy(this.getTileSize());
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level.ctx.drawImage(imageSource, offset.x, offset.y, tileSize.x, tileSize.y);
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// Consider the tile as complete - should happen automatically for images,
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// but canvases (or `CanvasImageSource`s other than `HTMLImageElement`s)
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// need this property to be set manually in order for pruning to work.
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imageSource.complete ??= true;
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// TODO: Clear the pixels of other levels' canvases where they overlap
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// this newly dumped tile.
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return this;
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},
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});
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@ -3,3 +3,4 @@ import {TileLayer} from './TileLayer.js';
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import {TileLayerWMS} from './TileLayer.WMS.js';
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TileLayer.WMS = TileLayerWMS;
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export {TileLayer};
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export {TileStitcher} from './TileStitcher.js';
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Reference in New Issue
Block a user