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CesiumJS 案例 P20：监听鼠标滚轮、监听鼠标左键按下与松开、监听鼠标右键按下与松开、监听鼠标左击落点

article 2024/11/5 4:03:50

CesiumJS

CesiumJS 是一个开源的 JavaScript 库，它用于在网页中创建和控制 3D 地球仪（地图）

CesiumJS 官网：https://www.cesium.com/
CesiumJS 下载地址：https://www.cesium.com/platform/cesiumjs/
CesiumJS API 文档：https://cesium.com/learn/cesiumjs/ref-doc/index.html

一、监听鼠标滚轮

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>ScreenSpaceEventHandler - 监听鼠标滚轮</title>
        <link rel="stylesheet" href="../js/Cesium-1.112/Build/Cesium/Widgets/widgets.css" />
        <style>
            * {
                margin: 0;
                padding: 0;
                box-sizing: border-box;
            }

            html,
            body {
                width: 100%;
                height: 100%;
            }

            .container {
                width: 100%;
                height: 100%;
            }
        </style>
    </head>

    <body>
        <div id="container"></div>
    </body>

    <script src="../js/Cesium-1.112/Build/Cesium/Cesium.js"></script>
    <script>
        const viewer = new Cesium.Viewer("container");

        const handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);

        handler.setInputAction((delta) => {
            console.log("滚动量为：", delta);
        }, Cesium.ScreenSpaceEventType.WHEEL);
    </script>
</html>

二、监听鼠标左键按下与松开

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>ScreenSpaceEventHandler - 监听鼠标左键按下与松开</title>
        <link rel="stylesheet" href="../js/Cesium-1.112/Build/Cesium/Widgets/widgets.css" />
        <style>
            * {
                margin: 0;
                padding: 0;
                box-sizing: border-box;
            }

            html,
            body {
                width: 100%;
                height: 100%;
            }

            .container {
                width: 100%;
                height: 100%;
            }
        </style>
    </head>

    <body>
        <div id="container"></div>
    </body>

    <script src="../js/Cesium-1.112/Build/Cesium/Cesium.js"></script>
    <script>
        const viewer = new Cesium.Viewer("container");

        const handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);

        handler.setInputAction((click) => {
            console.log("鼠标左键按下了！！！位置为：", click.position.x, click.position.y);
        }, Cesium.ScreenSpaceEventType.LEFT_DOWN);

        handler.setInputAction((click) => {
            console.log("鼠标左键松开了，位置为：", click.position.x, click.position.y);
        }, Cesium.ScreenSpaceEventType.LEFT_UP);
    </script>
</html>

三、监听鼠标右键按下与松开

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>ScreenSpaceEventHandler - 监听鼠标右键按下与松开</title>
        <link rel="stylesheet" href="../js/Cesium-1.112/Build/Cesium/Widgets/widgets.css" />
        <style>
            * {
                margin: 0;
                padding: 0;
                box-sizing: border-box;
            }

            html,
            body {
                width: 100%;
                height: 100%;
            }

            .container {
                width: 100%;
                height: 100%;
            }
        </style>
    </head>

    <body>
        <div id="container"></div>
    </body>

    <script src="../js/Cesium-1.112/Build/Cesium/Cesium.js"></script>
    <script>
        const viewer = new Cesium.Viewer("container");

        const handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);

        handler.setInputAction((click) => {
            console.log("鼠标右键按下了！！！位置为：", click.position.x, click.position.y);
        }, Cesium.ScreenSpaceEventType.RIGHT_DOWN);

        handler.setInputAction((click) => {
            console.log("鼠标右键松开了，位置为：", click.position.x, click.position.y);
        }, Cesium.ScreenSpaceEventType.RIGHT_UP);
    </script>
</html>

四、监听鼠标左击落点

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>ScreenSpaceEventHandler - 监听鼠标左击落点</title>
        <link rel="stylesheet" href="../js/Cesium-1.112/Build/Cesium/Widgets/widgets.css" />
        <style>
            * {
                margin: 0;
                padding: 0;
                box-sizing: border-box;
            }

            html,
            body {
                width: 100%;
                height: 100%;
            }

            .container {
                width: 100%;
                height: 100%;
            }
        </style>
    </head>

    <body>
        <div id="container"></div>
    </body>

    <script src="../js/Cesium-1.112/Build/Cesium/Cesium.js"></script>
    <script>
        const viewer = new Cesium.Viewer("container");

        const handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);

        handler.setInputAction(function (click) {
            // 获取左击位置的射线
            const pickRay = viewer.camera.getPickRay(click.position);

            // 在地球表面找到与射线相交的点
            const pickPosition = viewer.scene.globe.pick(pickRay, viewer.scene);

            if (Cesium.defined(pickPosition)) {
                // 如果找到了交点，将其转换为地理坐标（Cartographic）
                const cartographic = Cesium.Ellipsoid.WGS84.cartesianToCartographic(pickPosition);

                // 这里转换成直观的地理度数坐标
                console.log("左击落点在地球球面，地理坐标为：", Cesium.Math.toDegrees(cartographic.longitude), Cesium.Math.toDegrees(cartographic.latitude));
            } else {
                console.log("左击落点不在地球球面");
            }
        }, Cesium.ScreenSpaceEventType.LEFT_CLICK);
    </script>
</html>