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<html>
<head>
<meta charset="utf-8" />
<meta
name="viewport"
content="initial-scale=1,maximum-scale=1,user-scalable=no"
/>
<!--
ArcGIS API for JavaScript, https://js.arcgis.com
For more information about the layers-custom-tilelayer sample, read the original sample description at developers.arcgis.com.
https://developers.arcgis.com/javascript/latest/sample-code/layers-custom-tilelayer/index.html
-->
<title>Custom TileLayer - 4.13</title>
<link
rel="stylesheet"
href="https://js.arcgis.com/4.13/esri/themes/light/main.css"
/>
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<script src="https://js.arcgis.com/4.13/"></script>
<script>
require([
"esri/Map",
"esri/request",
"esri/Color",
"esri/views/SceneView",
"esri/widgets/LayerList",
"esri/layers/BaseDynamicLayer",
"esri/layers/BaseTileLayer"
], function(
Map,
esriRequest,
Color,
SceneView,
LayerList,
BaseDynamicLayer,
BaseTileLayer
) {
// *******************************************************
// Custom tile layer class code
// Create a subclass of BaseTileLayer
// *******************************************************
var TintLayer = BaseTileLayer.createSubclass({
properties: {
urlTemplate: null,
tint: {
value: null,
type: Color
}
},
// generate the tile url for a given level, row and column
getTileUrl: function(level, row, col) {
return this.urlTemplate
.replace("{z}", level)
.replace("{x}", col)
.replace("{y}", row);
},
// This method fetches tiles for the specified level and size.
// Override this method to process the data returned from the server.
fetchTile: function(level, row, col) {
// call getTileUrl() method to construct the URL to tiles
// for a given level, row and col provided by the LayerView
var url = this.getTileUrl(level, row, col);
// request for tiles based on the generated url
return esriRequest(url, {
responseType: "image"
}).then(
function(response) {
// when esri request resolves successfully
// get the image from the response
var image = response.data;
var width = this.tileInfo.size[0];
var height = this.tileInfo.size[0];
// create a canvas with 2D rendering context
var canvas = document.createElement("canvas");
var context = canvas.getContext("2d");
canvas.width = width;
canvas.height = height;
// Apply the tint color provided by
// by the application to the canvas
if (this.tint) {
// Get a CSS color string in rgba form
// representing the tint Color instance.
context.fillStyle = this.tint.toCss();
context.fillRect(0, 0, width, height);
// Applies "difference" blending operation between canvas
// and steman tiles. Difference blending operation subtracts
// the bottom layer (canvas) from the top layer (tiles) or the
// other way round to always get a positive value.
context.globalCompositeOperation = "difference";
}
// Draw the blended image onto the canvas.
context.drawImage(image, 0, 0, width, height);
return canvas;
}.bind(this)
);
}
});
// *******************************************************
// Start of JavaScript application
// *******************************************************
// *******************************************************
// Create a subclass of BaseDynamicLayer
// *******************************************************
var CustomWMSLayer = BaseDynamicLayer.createSubclass({
properties: {
mapUrl: null,
mapParameters: null
},
// Override the getImageUrl() method to generate URL
// to an image for a given extent, width, and height.
getImageUrl: function(extent, width, height) {
var urlVariables = this._prepareQuery(
this.mapParameters,
extent,
width,
height
);
var queryString = this._joinUrlVariables(urlVariables);
return this.mapUrl + "?" + queryString;
},
// Prepare query parameters for the URL to an image to be generated
_prepareQuery: function(queryParameters, extent, width, height) {
var wkid = extent.spatialReference.isWebMercator
? 3857
: extent.spatialReference.wkid;
var replacers = {
width: width,
height: height,
wkid: wkid,
xmin: extent.xmin,
xmax: extent.xmax,
ymin: extent.ymin,
ymax: extent.ymax
};
var urlVariables = this._replace({}, queryParameters, replacers);
return urlVariables;
},
// replace the url variables with the application provided values
_replace: function(urlVariables, queryParameters, replacers) {
Object.keys(queryParameters).forEach(function(key) {
urlVariables[key] = Object.keys(replacers).reduce(function(
previous,
replacerKey
) {
return previous.replace(
"{" + replacerKey + "}",
replacers[replacerKey]
);
},
queryParameters[key]);
});
return urlVariables;
},
// join the url parameters
_joinUrlVariables: function(urlVariables) {
return Object.keys(urlVariables).reduce(function(previous, key) {
return (
previous + (previous ? "&" : "") + key + "=" + urlVariables[key]
);
}, "");
}
});
// *******************************************************
// end of custom dynamic layer
// *******************************************************
var wmsLayer = new CustomWMSLayer({
mapUrl: "https://geobretagne.fr/geoserver/cadastre/ows",
mapParameters: {
SERVICE: "WMS",
REQUEST: "GetMap",
FORMAT: "image/png",
TRANSPARENT: "TRUE",
STYLES: "",
VERSION: "1.3.0",
LAYERS: "CP.CadastralParcel",
WIDTH: "{width}",
HEIGHT: "{height}",
CRS: "EPSG:{wkid}",
BBOX: "{xmin},{ymin},{xmax},{ymax}"
}
});
// Create a new instance of the TintLayer and set its properties
var stamenTileLayer = new TintLayer({
urlTemplate:
"https://stamen-tiles.a.ssl.fastly.net/toner/{z}/{x}/{y}.png",
tint: new Color("#004FBB"),
title: "Stamen Toner"
});
// add the new instance of the custom tile layer the map
var map = new Map({
layers: [stamenTileLayer, wmsLayer]
});
// create a new scene view and add the map
var view = new SceneView({
container: "viewDiv",
map: map,
center: [-4.489643,48.3871035],
zoom: 17
});
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>
Also see: Tab Triggers