Imagery Adjustment_viewModel.html

<!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, maximum-scale=1, minimum-scale=1, user-scalable=no">
    <meta name="description" content="Adjust brightness, contrast, hue, saturation, and gamma of an imagery layer.">
    <meta name="cesium-sandcastle-labels" content="Showcases">
    <title>Imagery Adjustment</title>

    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script type="text/javascript" src="../../../ThirdParty/requirejs-2.1.20/require.js"></script>
    <script type="text/javascript">
    require.config({
        baseUrl : '../../../Source',
        waitSeconds : 60
    });
    </script>
</head>

<body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html">
<style>
    @import url(../templates/bucket.css);
    #toolbar {
        background: rgba(100, 100, 100, 0.8);
        padding: 4px;
        border-radius: 4px;
    }
    #toolbar input {
        vertical-align: middle;
        padding-top: 2px;
        padding-bottom: 2px;
    }
</style>
<div id="cesiumContainer" class="fullSize"></div>
<div id="loadingOverlay"><h1>Loading...</h1></div>
<div id="toolbar">
<table>
    <tbody>
    <tr>
        <td>亮度</td>
        <td>
            <input type="range" min="0" max="3" step="0.02" data-bind="value: brightness, valueUpdate: 'input'">
            <input type="text" size="5" data-bind="value: brightness">
        </td>
    </tr>
    <tr>
        <td>对比度</td>
        <td>
            <input type="range" min="0" max="3" step="0.02" data-bind="value: contrast, valueUpdate: 'input'">
            <input type="text" size="5" data-bind="value: contrast">
        </td>
    </tr>
    <tr>
        <td>色调</td>
        <td>
            <input type="range" min="0" max="3" step="0.02" data-bind="value: hue, valueUpdate: 'input'">
            <input type="text" size="5" data-bind="value: hue">
        </td>
    </tr>
    <tr>
        <td>饱和度</td>
        <td>
            <input type="range" min="0" max="3" step="0.02" data-bind="value: saturation, valueUpdate: 'input'">
            <input type="text" size="5" data-bind="value: saturation">
        </td>
    </tr>
    <tr>
        <td>伽马</td>
        <td>
            <input type="range" min="0" max="3" step="0.02" data-bind="value: gamma, valueUpdate: 'input'">
            <input type="text" size="5" data-bind="value: gamma">
        </td>
    </tr>
    </tbody>
</table>
</div>
<script id="cesium_sandcastle_script">
function startup(Cesium) {
    'use strict';
    //Sandcastle_Begin
    Cesium.Ion.defaultAccessToken = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiIzNDhhYmQxOC1mYzMwLTRhYmEtOTI5Ny1iNGExNTQ3ZTZhODkiLCJpZCI6NTQ1NCwic2NvcGVzIjpbImFzciIsImdjIl0sImlhdCI6MTU0MzM3Mzc0NH0.RU6ynAZcwQvdfygt_N_j2rb2lpsuyyROzdaLQg0emAg';
    var viewer = new Cesium.Viewer('cesiumContainer');
    var imageryLayers = viewer.imageryLayers;

    // 视图模型跟踪我们的迷你应用程序的状态。
    var viewModel = {
        brightness: 0,
        contrast: 0,
        hue: 0,
        saturation: 0,
        gamma: 0
    };
    // 将视图模型成员转换为剔除的可观测值。
    Cesium.knockout.track(viewModel);

    // 将视图模型绑定到调用它的UI的dom元素。
    var toolbar = document.getElementById('toolbar');
    Cesium.knockout.applyBindings(viewModel, toolbar);

    // 使活动图像层成为视图模型的订阅者。
    function subscribeLayerParameter(name) {
        Cesium.knockout.getObservable(viewModel, name).subscribe(
            function(newValue) {
                if (imageryLayers.length > 0) {
                    var layer = imageryLayers.get(0);
                    layer[name] = newValue;
                }
            }
        );
    }
    subscribeLayerParameter('brightness');
    subscribeLayerParameter('contrast');
    subscribeLayerParameter('hue');
    subscribeLayerParameter('saturation');
    subscribeLayerParameter('gamma');

    // 使视图模型对底层更改做出反应。
    function updateViewModel() {
        if (imageryLayers.length > 0) {
            var layer = imageryLayers.get(0);
            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();
    //Sandcastle_End
    Sandcastle.finishedLoading();
}
if (typeof Cesium !== 'undefined') {
    startup(Cesium);
} else if (typeof require === 'function') {
    require(['Cesium'], startup);
}
</script>
</body>
</html>
Imagery Adjustment_viewModel.html

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