Sightline

new Cesium.Sightline(scene)

Line of sight analysis, that is, through-view analysis, establishes line-of-sight analysis based on observer points and target points, and analyzes the results in the scene.
Name Type Description
scene Scene Scene object.
Throws:
Example:
//Create a visual analysis
var sightline = new Cesium.Sightline(scene);
Demo:

Members

hiddenColor : Color

Gets or sets the invisible part of the color of the view.
Example:
var sightline = new Cesium.Sightline(scene);
var color = new Cesium.Color(1, 0, 0);
//Set the color of the invisible part
sightline .hiddenColor = color;
//Get the color of the invisible part
var value= sightline .hiddenColor ;

viewPosition : Array

Gets or sets the observer's location. The position is represented by an array of longitude, latitude, and elevation.
Example:
var sightline = new Cesium.Sightline(scene);
//Set the observer's position
sightline .viewPosition   = [120, 40, 100];
//Get the observer's location
var value= sightline .viewPosition;

visibleColor : Color

Gets or sets the visible portion of the color of the view.
Example:
var sightline = new Cesium.Sightline(scene);
var color = new Cesium.Color(0, 1, 0);
//Set the visible part of the color
sightline .visibleColor = color;
//Get visible part color
var value= sightline .visibleColor ;

Methods

addTargetPoint(options) → Boolean

Add a target point.
Name Type Description
options Object The object has the following properties.
Name Type Description
position Array Location information, represented by an array of longitude, latitude, and elevation。
name String The name of the target point.
Returns:
Returns true if the addition succeeds, otherwise returns false.
Example:
var sightline = new Cesium.Sightline(scene);
sightline.addTargetPoint({
postion : [120, 40, 50],
name : “first”
               });

build()

Perform a visual analysis.
Example:
var sightline = new Cesium.Sightline(scene);
sightline.build();

getBarrierPoint(name, func) → Object

Get obstacles.
Name Type Description
name String Target point name.
func Object Callback.
Returns:
Object.isViewer，Object.position Look through the latitude and longitude.

getObjectIds() → Object

Get a set of IDS collections that analyze all obstacle objects.
Returns:
Returns a k-v object, the key is the S3M layer ID, and the value is the object IDS array.

getVisibleInViewport(index) → Boolean

Get the layer's corresponding viewport visibility.
Name Type Description
index Number index.
Returns:
visible
Throws:

removeAllTargetPoint()

Remove all target points.
Example:
var sightline = new Cesium.Sightline(scene);
sightline.removeAllTargetPoint();

removeTargetPoint(name) → Boolean

Remove the target point of the specified name.
Name Type Description
name String The name of the target point to be removed.
Returns:
Returns true if the removal succeeds, otherwise returns false.
Example:
var sightline = new Cesium.Sightline(scene);
var flag = sightline.removeTargetPoint(“first”);

setVisibleInViewport(index)

Set the layer to correspond to viewport visibility.
Name Type Description
index Number index.
Throws: