通过这段代码进行修改JavaScript：// A simple demo of 3D Tiles feature picking with hover and select behavior
// Building data courtesy of NYC OpenData portal: http://www1.nyc.gov/site/doitt/initiatives/3d-building.page
const viewer = new Cesium.Viewer("cesiumContainer", {
terrain: Cesium.Terrain.fromWorldTerrain(),
});
viewer.scene.globe.depthTestAgainstTerrain = true;
// Set the initial camera view to look at
Manhattan
const initialPosition = Cesium.Cartesian3.fromDegrees(
-74.01881302800248,
40.69114333714821,
753,
);
const initialOrientation = new Cesium.HeadingPitchRoll.fromDegrees(
21.27879878293835,
-21.34390550872461,
0.0716951918898415,
);
viewer.scene.camera.setView({
destination: initialPosition,
orientation: initialOrientation,
endTransform: Cesium.Matrix4.IDENTITY,
});
// Load the NYC buildings tileset
try {
const tileset = await Cesium.Cesium3DTileset.fromIonAssetId(75343);
viewer.scene.primitives.add(tileset);
} catch (error) {
console.log(`Error loading tileset: ${error}`);
}
// HTML overlay for showing feature name on mouseover
const nameOverlay = document.createElement("div");
viewer.container.appendChild(nameOverlay);
nameOverlay.className = "backdrop";
nameOverlay.style.display = "none";
nameOverlay.style.position = "absolute";
nameOverlay.style.bottom = "0";
nameOverlay.style.left = "0";
nameOverlay.style["pointer-events"] = "none";
nameOverlay.style.padding = "4px";
nameOverlay.style.backgroundColor = "black";
// Information
about the currently selected feature
const selected = {
feature: undefined,
originalColor: new Cesium.Color(),
};
// An entity object which will hold info
about the currently selected feature for infobox display
const selectedEntity = new Cesium.Entity();
// Get default left click handler for when a feature is not picked on left click
const clickHandler = viewer.screenSpaceEventHandler.getInputAction(
Cesium.ScreenSpaceEventType.LEFT_CLICK,
);
// Update the 'nameOverlay' for the given picked feature,
// at the given (screen) position.
function updateNameOverlay(pickedFeature, position) {
if (!Cesium.defined(pickedFeature)) {
nameOverlay.style.display = "none";
return;
}
// A feature was picked, so show its overlay content
nameOverlay.style.display = "block";
nameOverlay.style.bottom = `${viewer.canvas.clientHeight - position.y}px`;
nameOverlay.style.left = `${position.x}px`;
const name = pickedFeature.getProperty("BIN");
nameOverlay.textContent = name;
}
// Create the HTML that will be put into the info box that shows
// information
about the currently selected feature
function createPickedFeatureDescription(pickedFeature) {
const description =
`${
'<table class="cesium-infoBox-defaultTable"><tbody>' +
"<tr><th>BIN</th><td>"
}${pickedFeature.getProperty("BIN")}</td></tr>` +
`<tr><th>DOITT ID</th><td>${pickedFeature.getProperty(
"DOITT_ID",
)}</td></tr>` +
`<tr><th>SOURCE ID</th><td>${pickedFeature.getProperty(
"SOURCE_ID",
)}</td></tr>` +
`<tr><th>Longitude</th><td>${pickedFeature.getProperty(
"Longitude",
)}</td></tr>` +
`<tr><th>Latitude</th><td>${pickedFeature.getProperty(
"Latitude",
)}</td></tr>` +
`<tr><th>Height</th><td>${pickedFeature.getProperty("Height")}</td></tr>` +
`<tr><th>Terrain Height (Ellipsoid)</th><td>${pickedFeature.getProperty(
"TerrainHeight",
)}</td></tr>` +
`</tbody></table>`;
return description;
}
// If silhouettes are supported, silhouette features in blue on mouse over and silhouette green on mouse click.
// If silhouettes are not supported, change the feature color to yellow on mouse over and green on mouse click.
if (Cesium.PostProcessStageLibrary.isSilhouetteSupported(viewer.scene)) {
// Silhouettes are supported
const silhouetteBlue =
Cesium.PostProcessStageLibrary.createEdgeDetectionStage();
silhouetteBlue.uniforms.color = Cesium.Color.BLUE;
silhouetteBlue.uniforms.
length = 0.01;
silhouetteBlue.selected = [];
const silhouetteGreen =
Cesium.PostProcessStageLibrary.createEdgeDetectionStage();
silhouetteGreen.uniforms.color = Cesium.Color.LIME;
silhouetteGreen.uniforms.
length = 0.01;
silhouetteGreen.selected = [];
viewer.scene.postProcessStages.add(
Cesium.PostProcessStageLibrary.createSilhouetteStage([
silhouetteBlue,
silhouetteGreen,
]),
);
// Silhouette a feature blue on hover.
viewer.screenSpaceEventHandler.setInputAction(function onMouseMove(movement) {
// If a feature was previously highlighted, undo the highlight
silhouetteBlue.selected = [];
// Pick a new feature
const pickedFeature = viewer.scene.pick(movement.endPosition);
updateNameOverlay(pickedFeature, movement.endPosition);
if (!Cesium.defined(pickedFeature)) {
return;
}
// Highlight the feature if it's not already selected.
if (pickedFeature !== selected.feature) {
silhouetteBlue.selected = [pickedFeature];
}
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
// Silhouette a feature on selection and show metadata in the InfoBox.
viewer.screenSpaceEventHandler.setInputAction(function onLeftClick(movement) {
// If a feature was previously selected, undo the highlight
silhouetteGreen.selected = [];
// Pick a new feature
const pickedFeature = viewer.scene.pick(movement.position);
if (!Cesium.defined(pickedFeature)) {
clickHandler(movement);
return;
}
// Select the feature if it's not already selected
if (silhouetteGreen.selected[0] === pickedFeature) {
return;
}
// Save the selected feature's original color
const highlightedFeature = silhouetteBlue.selected[0];
if (pickedFeature === highlightedFeature) {
silhouetteBlue.selected = [];
}
// Highlight newly selected feature
silhouetteGreen.selected = [pickedFeature];
// Set feature infobox description
viewer.selectedEntity = selectedEntity;
selectedEntity.description = createPickedFeatureDescription(pickedFeature);
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
} else {
// Silhouettes are not supported. Instead, change the feature color.
// Information
about the currently highlighted feature
const highlighted = {
feature: undefined,
originalColor: new Cesium.Color(),
};
// Color a feature yellow on hover.
viewer.screenSpaceEventHandler.setInputAction(function onMouseMove(movement) {
// If a feature was previously highlighted, undo the highlight
if (Cesium.defined(highlighted.feature)) {
highlighted.feature.color = highlighted.originalColor;
highlighted.feature = undefined;
}
// Pick a new feature
const pickedFeature = viewer.scene.pick(movement.endPosition);
updateNameOverlay(pickedFeature, movement.endPosition);
if (!Cesium.defined(pickedFeature)) {
return;
}
// Highlight the feature if it's not already selected.
if (pickedFeature !== selected.feature) {
highlighted.feature = pickedFeature;
Cesium.Color.clone(pickedFeature.color, highlighted.originalColor);
pickedFeature.color = Cesium.Color.YELLOW;
}
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
// Color a feature on selection and show metadata in the InfoBox.
viewer.screenSpaceEventHandler.setInputAction(function onLeftClick(movement) {
// If a feature was previously selected, undo the highlight
if (Cesium.defined(selected.feature)) {
selected.feature.color = selected.originalColor;
selected.feature = undefined;
}
// Pick a new feature
const pickedFeature = viewer.scene.pick(movement.position);
if (!Cesium.defined(pickedFeature)) {
clickHandler(movement);
return;
}
// Select the feature if it's not already selected
if (selected.feature === pickedFeature) {
return;
}
selected.feature = pickedFeature;
// Save the selected feature's original color
if (pickedFeature === highlighted.feature) {
Cesium.Color.clone(highlighted.originalColor, selected.originalColor);
highlighted.feature = undefined;
} else {
Cesium.Color.clone(pickedFeature.color, selected.originalColor);
}
// Highlight newly selected feature
pickedFeature.color = Cesium.Color.LIME;
// Set feature infobox description
viewer.selectedEntity = selectedEntity;
selectedEntity.description = createPickedFeatureDescription(pickedFeature);
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
} html：
<style>
@import url(../templates/bucket.css);
</style>
<div id="cesiumContainer" class="fullSize"></div>
<div id="loadingOverlay"><h1>Loading...</h1></div>
<div id="toolbar"></div>
本文介绍了在Allegro软件中如何查看网络信息，并解释了关键指标如etchlength（实际走线长度）和ManhattanLength（直角边之和长度）的概念及意义，通过Percentmanhattan百分比评估布线效率。
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