VelocityVectorProperty

new Ditap.VelocityVectorProperty(position, normalize)

A Property which evaluates to a Cartesian3 vector based on the velocity of the provided PositionProperty.
Name Type Default Description
position PositionProperty optional The position property used to compute the velocity.
normalize boolean true optional Whether to normalize the computed velocity vector.
Example:
//Create an entity with a billboard rotated to match its velocity.
const position = new Ditap.SampledProperty();
position.addSamples(...);
const entity = viewer.entities.add({
  position : position,
  billboard : {
    image : 'image.png',
    alignedAxis : new Ditap.VelocityVectorProperty(position, true) // alignedAxis must be a unit vector
  }
}));

Members

readonly definitionChanged : Event

Gets the event that is raised whenever the definition of this property changes.

readonly isConstant : boolean

Gets a value indicating if this property is constant.

normalize : boolean

Gets or sets whether the vector produced by this property will be normalized or not.

position : Property|undefined

Gets or sets the position property used to compute the velocity vector.

Methods

equals(other) → boolean

Compares this property to the provided property and returns true if they are equal, false otherwise.
Name Type Description
other Property optional The other property.
Returns:
true if left and right are equal, false otherwise.

getValue(time, result) → Cartesian3

Gets the value of the property at the provided time.
Name Type Default Description
time JulianDate JulianDate.now() optional The time for which to retrieve the value. If omitted, the current system time is used.
result Cartesian3 optional The object to store the value into, if omitted, a new instance is created and returned.
Returns:
The modified result parameter or a new instance if the result parameter was not supplied.
packages/engine
packages/widgets