PointPrimitive
查阅Mars3D API

internal constructor new Cesium.PointPrimitive()
engine/Source/Scene/PointPrimitive.js 43

A point is created and its initial properties are set by calling PointPrimitiveCollection#add. Do not call the constructor directly.
A graphical point positioned in the 3D scene, that is created and rendered using a PointPrimitiveCollection.
Performance:

Reading a property, e.g., PointPrimitive#show, is constant time. Assigning to a property is constant time but results in CPU to GPU traffic when PointPrimitiveCollection#update is called. The per-pointPrimitive traffic is the same regardless of how many properties were updated. If most pointPrimitives in a collection need to be updated, it may be more efficient to clear the collection with PointPrimitiveCollection#removeAll and add new pointPrimitives instead of modifying each one.

Throws:
  • DeveloperError : scaleByDistance.far must be greater than scaleByDistance.near
  • DeveloperError : translucencyByDistance.far must be greater than translucencyByDistance.near
  • DeveloperError : distanceDisplayCondition.far must be greater than distanceDisplayCondition.near
Demo:
参考:

成员(属性)

color : Color
engine/Source/Scene/PointPrimitive.js 325

Gets or sets the inner color of the point. The red, green, blue, and alpha values are indicated by value's red, green, blue, and alpha properties as shown in Example 1. These components range from 0.0 (no intensity) to 1.0 (full intensity).
使用示例s:
// Example 1. Assign yellow.
p.color = Cesium.Color.YELLOW;
// Example 2. Make a pointPrimitive 50% translucent.
p.color = new Cesium.Color(1.0, 1.0, 1.0, 0.5);

disableDepthTestDistance : number
engine/Source/Scene/PointPrimitive.js 427

Gets or sets the distance from the camera at which to disable the depth test to, for example, prevent clipping against terrain. When set to zero, the depth test is always applied. When set to Number.POSITIVE_INFINITY, the depth test is never applied.
默认值: 0.0

distanceDisplayCondition : DistanceDisplayCondition
engine/Source/Scene/PointPrimitive.js 398

Gets or sets the condition specifying at what distance from the camera that this point will be displayed.
默认值: undefined

id : *
engine/Source/Scene/PointPrimitive.js 451

Gets or sets the user-defined value returned when the point is picked.

outlineColor : Color
engine/Source/Scene/PointPrimitive.js 349

Gets or sets the outline color of the point.

outlineWidth : number
engine/Source/Scene/PointPrimitive.js 374

Gets or sets the outline width in pixels. This width adds to pixelSize, increasing the total size of the point.

pixelSize : number
engine/Source/Scene/PointPrimitive.js 291

Gets or sets the inner size of the point in pixels.

position : Cartesian3
engine/Source/Scene/PointPrimitive.js 175

Gets or sets the Cartesian position of this point.

scaleByDistance : NearFarScalar
engine/Source/Scene/PointPrimitive.js 219

Gets or sets near and far scaling properties of a point based on the point's distance from the camera. A point's scale will interpolate between the NearFarScalar#nearValue and NearFarScalar#farValue while the camera distance falls within the lower and upper bounds of the specified NearFarScalar#near and NearFarScalar#far. Outside of these ranges the point's scale remains clamped to the nearest bound. This scale multiplies the pixelSize and outlineWidth to affect the total size of the point. If undefined, scaleByDistance will be disabled.
使用示例s:
// Example 1.
// Set a pointPrimitive's scaleByDistance to scale to 15 when the
// camera is 1500 meters from the pointPrimitive and disappear as
// the camera distance approaches 8.0e6 meters.
p.scaleByDistance = new Cesium.NearFarScalar(1.5e2, 15, 8.0e6, 0.0);
// Example 2.
// disable scaling by distance
p.scaleByDistance = undefined;

show : boolean
engine/Source/Scene/PointPrimitive.js 152

Determines if this point will be shown. Use this to hide or show a point, instead of removing it and re-adding it to the collection.

translucencyByDistance : NearFarScalar
engine/Source/Scene/PointPrimitive.js 262

Gets or sets near and far translucency properties of a point based on the point's distance from the camera. A point's translucency will interpolate between the NearFarScalar#nearValue and NearFarScalar#farValue while the camera distance falls within the lower and upper bounds of the specified NearFarScalar#near and NearFarScalar#far. Outside of these ranges the point's translucency remains clamped to the nearest bound. If undefined, translucencyByDistance will be disabled.
使用示例s:
// Example 1.
// Set a point's translucency to 1.0 when the
// camera is 1500 meters from the point and disappear as
// the camera distance approaches 8.0e6 meters.
p.translucencyByDistance = new Cesium.NearFarScalar(1.5e2, 1.0, 8.0e6, 0.0);
// Example 2.
// disable translucency by distance
p.translucencyByDistance = undefined;

方法

computeScreenSpacePosition(scene, result) → Cartesian2
engine/Source/Scene/PointPrimitive.js 569

Computes the screen-space position of the point's origin. The screen space origin is the top, left corner of the canvas; x increases from left to right, and y increases from top to bottom.
参数名称 类型 描述信息
scene Scene The scene.
result Cartesian2 可选 The object onto which to store the result.
返回值:
The screen-space position of the point.
Throws:
使用示例:
console.log(p.computeScreenSpacePosition(scene).toString());

equals(other) → boolean
engine/Source/Scene/PointPrimitive.js 640

Determines if this point equals another point. Points are equal if all their properties are equal. Points in different collections can be equal.
参数名称 类型 描述信息
other PointPrimitive The point to compare for equality.
返回值:
true if the points are equal; otherwise, false.
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