3、Cesium学习之修改图层颜色
js代码都是https://sandcastle.cesium.com网站上的示例,直接复制到本地有些不能直接运行的1、实例//绑定地图容器var viewer = new Cesium.Viewer("cesiumContainer");//获取图层列表集合var imageryLayers = viewer.imageryLayers;//创建一个对象,其属性值是接下来要用的参数值,这么做更多
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js代码都是https://sandcastle.cesium.com网站上的示例,直接复制到本地有些不能直接运行的
1、实例
//绑定地图容器
var viewer = new Cesium.Viewer("cesiumContainer");
//获取图层列表集合
var imageryLayers = viewer.imageryLayers;
//创建一个对象,其属性值是接下来要用的参数值,这么做更多的是为了美观
var viewModel = {
//图层亮度,1.0使用未修改的图像颜色。小于1.0会使图像更暗,而大于1.0会使图像更亮
brightness: 0,
//图层对比度,1.0使用未修改的图像颜色。小于1.0会降低对比度,大于1.0会增加对比度。
contrast: 0,
//图层色调,单位为弧度,0表示使用未修改的图像颜色
hue: 0,
//图层饱和度,1.0使用未修改的图像颜色。小于1.0会降低饱和度,大于1.0会增加饱和度。
saturation: 0,
//应用于该图层的伽马校正,1.0使用未修改的图像颜色。
gamma: 0,
};
Cesium.knockout.track(viewModel);
var toolbar = document.getElementById("toolbar");
Cesium.knockout.applyBindings(viewModel, toolbar);
// 函数1
function subscribeLayerParameter(name) {
Cesium.knockout
.getObservable(viewModel, name)
.subscribe(function (newValue) {
if (imageryLayers.length > 0) {
//获取第一个图层
var layer = imageryLayers.get(0);
//name代表的是键名(比如hue、gamma等),修改这个值,注释1
layer[name] = newValue;
}
});
}
//这里调用函数1,结合注释1,就看懂了
subscribeLayerParameter("brightness");
subscribeLayerParameter("contrast");
subscribeLayerParameter("hue");
subscribeLayerParameter("saturation");
subscribeLayerParameter("gamma");
function updateViewModel() {
if (imageryLayers.length > 0) {
var layer = imageryLayers.get(0);
//下面这段代码,就是将图层的属性值和之前声明的对象中的属性值进行绑定,他变她也变,动态修改亮度,对比度,色调,饱和度,伽马校正
viewModel.brightness = layer.brightness;
viewModel.contrast = layer.contrast;
viewModel.hue = layer.hue;
viewModel.saturation = layer.saturation;
viewModel.gamma = layer.gamma;
}
}
imageryLayers.layerAdded.addEventListener(updateViewModel);
imageryLayers.layerRemoved.addEventListener(updateViewModel);
imageryLayers.layerMoved.addEventListener(updateViewModel);
updateViewModel();
2、亲测
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="https://cesium.com/downloads/cesiumjs/releases/1.79.1/Build/Cesium/Cesium.js"></script>
<link href="https://cesium.com/downloads/cesiumjs/releases/1.79.1/Build/Cesium/Widgets/widgets.css"
rel="stylesheet">
</head>
<style>
</style>
<div id="container">
<div style="position: fixed;z-index: 2000;color: white;background-color: rgba(255, 255, 255, 0.5);">
<div>
<span>brightness(亮度)</span><input type="range" min="0" max="3" step="0.01" value="1" name=""
id="brightness">
<input type="text" name="" id="brightnessText" value="1">
</div>
<div>
<span>contrast(对比度)</span><input type="range" min="0" max="3" step="0.01" value="1" name="" id="contrast">
<input type="text" name="" id="contrastText" value="1">
</div>
<span>hue(色调)</span><input type="range" min="0" max="3" step="0.01" value="0" name="" id="hue">
<input type="text" name="" id="hueText" value="0">
<div>
<span>saturation(饱和度)</span><input type="range" min="0" max="3" step="0.01" value="1" name=""
id="saturation">
<input type="text" name="" id="saturationText" value="1">
</div>
<div>
<span>gamma(伽马校正)</span><input type="range" min="0" max="3" step="0.01" value="1" name="" id="gamma">
<input type="text" name="" id="gammaText" value="1">
</div>
</div>
</div>
<body>
</body>
<script>
let viewer = new Cesium.Viewer('container')
</script>
<script>
let layer = viewer.imageryLayers.get(0)
document.getElementById('brightness').onchange = () => {
document.getElementById('brightnessText').value = document.getElementById('brightness').value
layer.brightness = document.getElementById('brightness').value
}
document.getElementById('contrast').onchange = () => {
document.getElementById('contrastText').value = document.getElementById('contrast').value
layer.contrast = document.getElementById('contrast').value
}
document.getElementById('saturation').onchange = () => {
document.getElementById('saturationText').value = document.getElementById('saturation').value
layer.saturation = document.getElementById('saturation').value
}
document.getElementById('hue').onchange = () => {
document.getElementById('hueText').value = document.getElementById('hue').value
layer.hue = document.getElementById('hue').value
}
document.getElementById('gamma').onchange = () => {
document.getElementById('gammaText').value = document.getElementById('gamma').value
layer.gamma = document.getElementById('gamma').value
}
</script>
</html>
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