原文链接及内容
使用图标的宽度和高度属性的示例。用输入框中的值来调整图标实际的宽度和高度。
main.js代码如下：
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| import Feature from 'ol/Feature.js';
import Map from 'ol/Map.js';
import Point from 'ol/geom/Point.js';
import TileJSON from 'ol/source/TileJSON.js';
import VectorSource from 'ol/source/Vector.js';
import View from 'ol/View.js';
import {Icon, Style} from 'ol/style.js';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
const widthInput = document.getElementById('width-input');
const heightInput = document.getElementById('height-input');
const clearWidthButton = document.getElementById('clear-width-button');
const clearHeightButton = document.getElementById('clear-height-button');
const scaleSpan = document.getElementById('scale');
const iconFeature = new Feature({
geometry: new Point([0, 0]),
name: 'Null Island',
population: 4000,
rainfall: 500,
});
const iconStyle = new Style({
image: new Icon({
src: 'data/icon.png',
width: widthInput.value,
height: heightInput.value,
}),
});
iconFeature.setStyle(iconStyle);
const image = iconStyle.getImage().getImage();
image.addEventListener('load', () => {
scaleSpan.innerText = formatScale(iconStyle.getImage().getScale());
});
widthInput.addEventListener('input', (event) => {
iconStyle.getImage().setWidth(event.target.value);
iconFeature.changed();
scaleSpan.innerText = formatScale(iconStyle.getImage().getScale());
});
heightInput.addEventListener('input', (event) => {
iconStyle.getImage().setHeight(event.target.value);
iconFeature.changed();
scaleSpan.innerText = formatScale(iconStyle.getImage().getScale());
});
clearWidthButton.addEventListener('click', () => {
widthInput.value = undefined;
iconStyle.getImage().setWidth(undefined);
scaleSpan.innerText = formatScale(iconStyle.getImage().getScale());
iconFeature.changed();
});
clearHeightButton.addEventListener('click', () => {
heightInput.value = undefined;
iconStyle.getImage().setHeight(undefined);
scaleSpan.innerText = formatScale(iconStyle.getImage().getScale());
iconFeature.changed();
});
const vectorSource = new VectorSource({
features: [iconFeature],
});
const vectorLayer = new VectorLayer({
source: vectorSource,
});
const rasterLayer = new TileLayer({
source: new TileJSON({
url: 'https://a.tiles.mapbox.com/v3/aj.1x1-degrees.json?secure=1',
crossOrigin: '',
}),
});
new Map({
layers: [rasterLayer, vectorLayer],
target: document.getElementById('map'),
view: new View({
center: [0, 0],
zoom: 3,
}),
});
function formatScale(scale) {
return Array.isArray(scale)
? '[' + scale?.map((v) => v.toFixed(2)).join(', ') + ']'
: scale;
}
|
界面布局文件index.html代码如下：
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| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Icon Symbolizer width and height</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0/dist/css/bootstrap.min.css">
<link rel="stylesheet" href="node_modules/ol/ol.css">
<style>
.map {
width: 100%;
height: 400px;
}
</style>
</head>
<body>
<div id="map" class="map"><div id="popup"></div></div>
<div class="controls">
<div style="margin: 1em 0;">
<label for="width">Width:</label>
<input id="width-input" name="width" type="number" value="40"/>
<button id="clear-width-button">clear</button>
</div>
<div style="margin: 1em 0;">
<label for="height">Height:</label>
<input id="height-input" name="height" type="number" value="40"/>
<button id="clear-height-button">clear</button>
</div>
<div style="margin: 1em 0;">
<label for="height">Scale approx.:</label>
<span id="scale"></span>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/elm-pep@1.0.6/dist/elm-pep.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0/dist/js/bootstrap.bundle.min.js"></script>
<script type="module" src="main.js"></script>
</body>
</html>
|
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