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RiverRegulation/common/plugin/map/ol/v6.5.0/examples/canvas-gradient-pattern.html

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<h4 id="title">Styling feature with CanvasGradient or CanvasPattern</h4>
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<span class="badge-group">
<a
href="./index.html?q=canvas" class="badge badge-info">canvas</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="canvas"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./canvas-tiles.html&quot;&gt;Canvas Tiles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./earthquake-custom-symbol.html&quot;&gt;Earthquakes with custom symbols&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-negative.html&quot;&gt;Icon Pixel Operations&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./render-geometry.html&quot;&gt;Render geometries to a canvas&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./canvas-gradient-pattern.html&quot;&gt;Styling feature with CanvasGradient or CanvasPattern&lt;/a&gt;"
tabindex="0"
>5</a>
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<a
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><a
class="badge badge-info tag-modal-toggle text-white"
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data-target="#tag-example-list"
data-title="gradient"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./canvas-gradient-pattern.html&quot;&gt;Styling feature with CanvasGradient or CanvasPattern&lt;/a&gt;"
tabindex="0"
>1</a>
</span>
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<a
href="./index.html?q=pattern" class="badge badge-info">pattern</a
><a
class="badge badge-info tag-modal-toggle text-white"
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data-target="#tag-example-list"
data-title="pattern"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./canvas-gradient-pattern.html&quot;&gt;Styling feature with CanvasGradient or CanvasPattern&lt;/a&gt;"
tabindex="0"
>1</a>
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&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./animated-gif.html&quot;&gt;Animated GIF&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./polygon-styles.html&quot;&gt;Custom Polygon Styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./earthquake-clusters.html&quot;&gt;Earthquake Clusters&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./heatmap-earthquakes.html&quot;&gt;Earthquakes Heatmap&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./kml-earthquakes.html&quot;&gt;Earthquakes in KML&lt;/a&gt;
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&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-negative.html&quot;&gt;Icon Pixel Operations&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-scale.html&quot;&gt;Icon Scale&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon.html&quot;&gt;Icon Symbolizer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./regularshape.html&quot;&gt;Regular Shapes&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./style-renderer.html&quot;&gt;Style renderer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./canvas-gradient-pattern.html&quot;&gt;Styling feature with CanvasGradient or CanvasPattern&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./kml-timezones.html&quot;&gt;Timezones in KML&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./topojson.html&quot;&gt;TopoJSON&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./zoomslider.html&quot;&gt;Zoom Sliders&lt;/a&gt;"
tabindex="0"
>16</a>
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<p id="shortdesc">Example showing the countries vector layer styled with patterns and gradients.</p>
<div id="docs"><p>This example creates a <a href="https://developer.mozilla.org/en-US/docs/Web/API/CanvasPattern"><code>CanvasPattern</code></a> and a <a href="https://developer.mozilla.org/en/docs/Web/API/CanvasGradient"><code>CanvasGradient</code></a>. The countries are loaded from a GeoJSON file. A style function determines for each country whether to use a fill with the CanvasGradient (rainbow colors) or a CanvasPattern (repeating stacked circles). <strong>Note</strong>: For seamless repeat patterns, image width and height of the pattern image must be a factor of two (2, 4, 8, ..., 512).</p>
</div>
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<div class="row-fluid">
<h5 class="source-heading">main.js</h5>
<pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
import GeoJSON from &#x27;ol/format/GeoJSON&#x27;;
import Map from &#x27;ol/Map&#x27;;
import VectorLayer from &#x27;ol/layer/Vector&#x27;;
import VectorSource from &#x27;ol/source/Vector&#x27;;
import View from &#x27;ol/View&#x27;;
import {DEVICE_PIXEL_RATIO} from &#x27;ol/has&#x27;;
import {Fill, Stroke, Style} from &#x27;ol/style&#x27;;
import {fromLonLat} from &#x27;ol/proj&#x27;;
var canvas &#x3D; document.createElement(&#x27;canvas&#x27;);
var context &#x3D; canvas.getContext(&#x27;2d&#x27;);
// Gradient and pattern are in canvas pixel space, so we adjust for the
// renderer&#x27;s pixel ratio
var pixelRatio &#x3D; DEVICE_PIXEL_RATIO;
// Generate a rainbow gradient
var gradient &#x3D; (function () {
var grad &#x3D; context.createLinearGradient(0, 0, 512 * pixelRatio, 0);
grad.addColorStop(0, &#x27;red&#x27;);
grad.addColorStop(1 / 6, &#x27;orange&#x27;);
grad.addColorStop(2 / 6, &#x27;yellow&#x27;);
grad.addColorStop(3 / 6, &#x27;green&#x27;);
grad.addColorStop(4 / 6, &#x27;aqua&#x27;);
grad.addColorStop(5 / 6, &#x27;blue&#x27;);
grad.addColorStop(1, &#x27;purple&#x27;);
return grad;
})();
// Generate a canvasPattern with two circles on white background
var pattern &#x3D; (function () {
canvas.width &#x3D; 8 * pixelRatio;
canvas.height &#x3D; 8 * pixelRatio;
// white background
context.fillStyle &#x3D; &#x27;white&#x27;;
context.fillRect(0, 0, canvas.width, canvas.height);
// outer circle
context.fillStyle &#x3D; &#x27;rgba(102, 0, 102, 0.5)&#x27;;
context.beginPath();
context.arc(4 * pixelRatio, 4 * pixelRatio, 3 * pixelRatio, 0, 2 * Math.PI);
context.fill();
// inner circle
context.fillStyle &#x3D; &#x27;rgb(55, 0, 170)&#x27;;
context.beginPath();
context.arc(4 * pixelRatio, 4 * pixelRatio, 1.5 * pixelRatio, 0, 2 * Math.PI);
context.fill();
return context.createPattern(canvas, &#x27;repeat&#x27;);
})();
// Generate style for gradient or pattern fill
var fill &#x3D; new Fill();
var style &#x3D; new Style({
fill: fill,
stroke: new Stroke({
color: &#x27;#333&#x27;,
width: 2,
}),
});
/**
* The styling function for the vector layer, will return an array of styles
* which either contains the aboove gradient or pattern.
*
* @param {import(&quot;../src/ol/Feature.js&quot;).default} feature The feature to style.
* @return {Style} The style to use for the feature.
*/
var getStackedStyle &#x3D; function (feature) {
var id &#x3D; feature.getId();
fill.setColor(id &gt; &#x27;J&#x27; ? gradient : pattern);
return style;
};
// Create a vector layer that makes use of the style function above…
var vectorLayer &#x3D; new VectorLayer({
source: new VectorSource({
url: &#x27;data/geojson/countries.geojson&#x27;,
format: new GeoJSON(),
}),
style: getStackedStyle,
});
// … finally create a map with that layer.
var map &#x3D; new Map({
layers: [vectorLayer],
target: &#x27;map&#x27;,
view: new View({
center: fromLonLat([16, 48]),
zoom: 3,
}),
});
</code></pre>
</div>
<div class="row-fluid">
<h5 class="source-heading">index.html</h5>
<pre><code id="example-html-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
&lt;head&gt;
&lt;meta charset="UTF-8"&gt;
&lt;title&gt;Styling feature with CanvasGradient or CanvasPattern&lt;/title&gt;
&lt;!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer --&gt;
&lt;script src="https://unpkg.com/elm-pep"&gt;&lt;/script&gt;
&lt;style&gt;
.map {
width: 100%;
height:400px;
}
#map {
/* Image craeted by tatyana, from https://sftextures.com/2014/10/22/blue-sky-with-blurred-white-clouds-seamless-textures/ */
background-image: url(data:image/jpeg;base64,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
background-repeat: repeat;
}
&lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
&lt;script src="main.js"&gt;&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;</code></pre>
</div>
<div class="row-fluid">
<h5 class="source-heading">package.json</h5>
<pre><code id="example-pkg-source" class="language-json">{
&quot;name&quot;: &quot;canvas-gradient-pattern&quot;,
&quot;dependencies&quot;: {
&quot;ol&quot;: &quot;6.5.0&quot;
},
&quot;devDependencies&quot;: {
&quot;parcel&quot;: &quot;^2.0.0-beta.1&quot;
},
&quot;scripts&quot;: {
&quot;start&quot;: &quot;parcel index.html&quot;,
&quot;build&quot;: &quot;parcel build --public-url . index.html&quot;
}
}</code></pre>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.bundle.min.js"></script>
<script src="./resources/prism/prism-1.20.0.min.js"></script>
<script src="./resources/common.js"></script>
<script src="common.js"></script>
<script src="canvas-gradient-pattern.js"></script>
<script>
$('#tag-example-list').on('show.bs.modal', function (event) {
const button = $(event.relatedTarget); // Button that triggered the modal
const title = button.data('title');
const content = button.data('content');
const modal = $(this)
modal.find('.modal-title').text(title);
modal.find('.modal-body').html(content);
});
var packageUrl = 'https://raw.githubusercontent.com/openlayers/openlayers.github.io/build/package.json';
fetch(packageUrl).then(function(response) {
return response.json();
}).then(function(json) {
var latestVersion = json.version;
document.getElementById('latest-version').innerHTML = latestVersion;
var url = window.location.href;
var branchSearch = url.match(/\/([^\/]*)\/examples\//);
var cookieText = 'dismissed=-' + latestVersion + '-';
var dismissed = document.cookie.indexOf(cookieText) != -1;
if (branchSearch && !dismissed && /^v[0-9\.]*$/.test(branchSearch[1]) && '6.5.0' != latestVersion) {
var link = url.replace(branchSearch[0], '/latest/examples/');
fetch(link, {method: 'head'}).then(function(response) {
var a = document.getElementById('latest-link');
a.href = response.status == 200 ? link : '../../latest/examples/';
});
var latestCheck = document.getElementById('latest-check');
latestCheck.style.display = '';
document.getElementById('latest-dismiss').onclick = function() {
latestCheck.style.display = 'none';
document.cookie = cookieText;
}
}
});
</script>
</body>
</html>