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| <template> <div class="container"> <CesiumMap /> <div class="handle"> <el-button @click="showRealTimeLngLat"> 鼠标悬停时(实时)显示地图的(经纬度)位置 </el-button> <br /> <el-button @click="pickEntity">拾取Entity</el-button> <br /> <el-button @click="drillDownPick"> Drill-Down(逐层) Picking(拾取) </el-button> <br /> <el-button @click="pickGlbModel">拾取(模型)位置(经纬度及高度)</el-button> </div> </div> </template>
<script setup> import useCSViewerStore from "@/stores/csViewer.js"; import { toFixed } from "@/utils/math"; import CESIUM_LOGO_PNG from "@/assets/images/Cesium_Logo_overlay.png";
const cvs = useCSViewerStore();
let viewer, scene, handler;
onMounted(() => { viewer = cvs.viewer; scene = viewer.scene; scene.globe.depthTestAgainstTerrain = false; if (scene.pickPositionSupported) { ElMessage.success('当前浏览器支持鼠标拾取位置') } else { ElMessage.warning('当前浏览器不支持鼠标拾取位置') } });
onBeforeUnmount(() => { reset(); });
function showRealTimeLngLat() { reset(); const entity = viewer.entities.add({ label: { show: false, showBackground: true, font: "14px monospace", horizontalOrigin: Cesium.HorizontalOrigin.LEFT, verticalOrigin: Cesium.VerticalOrigin.TOP, pixelOffset: new Cesium.Cartesian2(15, 0), }, });
handler = new Cesium.ScreenSpaceEventHandler(scene.canvas); handler.setInputAction(function (movement) {
const cartesian = viewer.camera.pickEllipsoid( movement.endPosition, scene.globe.ellipsoid ); if (cartesian) { const cartographic = Cesium.Cartographic.fromCartesian(cartesian); const longitudeString = cartographic.longitude ? toFixed(Cesium.Math.toDegrees(cartographic.longitude), 2) : ""; const latitudeString = cartographic.latitude ? toFixed(Cesium.Math.toDegrees(cartographic.latitude), 2) : ""; entity.position = cartesian; entity.label.show = true; entity.label.text = `经度: ${longitudeString}\u00B0` + `\n纬度: ${latitudeString}\u00B0`; } else { entity.label.show = false; } }, Cesium.ScreenSpaceEventType.MOUSE_MOVE); }
function pickEntity() { reset(); const entity = viewer.entities.add({ position: Cesium.Cartesian3.fromDegrees(104.2, 35.13), billboard: { image: CESIUM_LOGO_PNG, }, });
handler = new Cesium.ScreenSpaceEventHandler(scene.canvas); handler.setInputAction(function (movement) { const pickedObject = scene.pick(movement.endPosition); if (Cesium.defined(pickedObject) && pickedObject.id === entity) { entity.billboard.scale = 2.0; entity.billboard.color = Cesium.Color.YELLOW; } else { entity.billboard.scale = 1.0; entity.billboard.color = Cesium.Color.WHITE; } }, Cesium.ScreenSpaceEventType.MOUSE_MOVE); }
const pickedEntities = new Cesium.EntityCollection();
const pickColor = Cesium.Color.YELLOW.withAlpha(0.5);
function drillDownPick() { reset();
const redEntity = viewer.entities.add({ polygon: { hierarchy: Cesium.Cartesian3.fromDegreesArray([ 104.2, 35.13, 114.2, 35.13, 114.2, 45.13, 104.2, 45.13, ]), height: 0, }, });
makeProperty(redEntity, Cesium.Color.RED.withAlpha(0.5));
const blueEntity = viewer.entities.add({ polygon: { hierarchy: Cesium.Cartesian3.fromDegreesArray([ 99.2, 39.13, 111.2, 39.13, 111.2, 45.13, 99.2, 45.13, ]), height: 0, }, }); makeProperty(blueEntity, Cesium.Color.BLUE.withAlpha(0.5));
const greenEntity = viewer.entities.add({ polygon: { hierarchy: Cesium.Cartesian3.fromDegreesArray([ 107.2, 41.13, 119.2, 41.13, 119.2, 35.13, 107.2, 35.13, ]), height: 0, }, }); makeProperty(greenEntity, Cesium.Color.GREEN.withAlpha(0.5)); handler = new Cesium.ScreenSpaceEventHandler(scene.canvas); handler.setInputAction(function (movement) { const pickedObjects = scene.drillPick(movement.endPosition); if (Cesium.defined(pickedObjects)) { pickedEntities.removeAll(); for (let i = 0; i < pickedObjects.length; ++i) { const entity = pickedObjects[i].id; pickedEntities.add(entity); } } }, Cesium.ScreenSpaceEventType.MOUSE_MOVE); }
function makeProperty(entity, color) {
const colorProperty = new Cesium.CallbackProperty((time, result) => { if (pickedEntities.contains(entity)) { return pickColor.clone(result); } return color.clone(result); }, false); entity.polygon.material = new Cesium.ColorMaterialProperty(colorProperty); }
function pickGlbModel() { reset(); const modelEntity = viewer.entities.add({ name: "牛奶卡车", position: Cesium.Cartesian3.fromDegrees(104.2, 35.13), model: { uri: "./SampleData/models/CesiumMilkTruck/CesiumMilkTruck.glb", }, }); viewer.zoomTo(modelEntity);
const labelEntity = viewer.entities.add({ label: { show: false, showBackground: true, font: "14px monospace", horizontalOrigin: Cesium.HorizontalOrigin.LEFT, verticalOrigin: Cesium.VerticalOrigin.TOP, pixelOffset: new Cesium.Cartesian2(15, 0), }, });
handler = new Cesium.ScreenSpaceEventHandler(scene.canvas); handler.setInputAction(function (movement) { let foundPosition = false;
const scene = viewer.scene;
if (scene.mode !== Cesium.SceneMode.MORPHING) { if (scene.pickPositionSupported) { const cartesian = viewer.scene.pickPosition(movement.endPosition);
if (Cesium.defined(cartesian)) { const cartographic = Cesium.Cartographic.fromCartesian(cartesian);
const longitudeString = cartographic.longitude ? toFixed(Cesium.Math.toDegrees(cartographic.longitude), 2) : ""; const latitudeString = cartographic.latitude ? toFixed(Cesium.Math.toDegrees(cartographic.latitude), 2) : ""; const heightString = cartographic.height ? toFixed(cartographic.height, 2) : "";
labelEntity.position = cartesian; labelEntity.label.show = true; labelEntity.label.text = `经度: ${longitudeString}\u00B0` + `\n纬度: ${latitudeString}\u00B0` + `\n海拔: ${heightString}m`;
labelEntity.label.eyeOffset = new Cesium.Cartesian3( 0.0, 0.0, -cartographic.height * (scene.mode === Cesium.SceneMode.SCENE2D ? 1.5 : 1.0) );
foundPosition = true; } } }
if (!foundPosition) { labelEntity.label.show = false; } }, Cesium.ScreenSpaceEventType.MOUSE_MOVE); }
function reset() { viewer.camera.flyHome(0); viewer.entities.removeAll(); handler = handler && handler.destroy(); }
</script>
<style lang="scss" scoped> .container { position: relative; height: 100%; overflow: hidden;
.handle { position: absolute; right: 10px; top: 10px; text-align: right;
.el-button { margin-right: 0; margin-bottom: 12px; } } } </style>
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