Performance:
For best performance, prefer a few collections, each with many points, to many collections with only a few points each. Organize collections so that points with the same update frequency are in the same collection, i.e., points that do not change should be in one collection; points that change every frame should be in another collection; and so on.
| Name | Type | Description | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
options |
object |
optional
Object with the following properties:
|
Example:
// Create a pointPrimitive collection with two points
const points = scene.primitives.add(new Cesium.PointPrimitiveCollection());
points.add({
position : new Cesium.Cartesian3(1.0, 2.0, 3.0),
color : Cesium.Color.YELLOW
});
points.add({
position : new Cesium.Cartesian3(4.0, 5.0, 6.0),
color : Cesium.Color.CYAN
});See:
Members
-
Default Value:
BlendOption.OPAQUE_AND_TRANSLUCENT
绘制该图元中每个绘制命令的包围球。
-
Default Value:
false
PointPrimitiveCollection#get 配合使用，
以遍历集合中的所有点。
modelMatrix : Matrix4
Transforms.eastNorthUpToFixedFrame 所返回的矩阵）可使用局部参考系。
-
Default Value:
Matrix4.IDENTITYExample:
const center = Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883);
pointPrimitives.modelMatrix = Cesium.Transforms.eastNorthUpToFixedFrame(center);
pointPrimitives.add({
color : Cesium.Color.ORANGE,
position : new Cesium.Cartesian3(0.0, 0.0, 0.0) // center
});
pointPrimitives.add({
color : Cesium.Color.YELLOW,
position : new Cesium.Cartesian3(1000000.0, 0.0, 0.0) // east
});
pointPrimitives.add({
color : Cesium.Color.GREEN,
position : new Cesium.Cartesian3(0.0, 1000000.0, 0.0) // north
});
pointPrimitives.add({
color : Cesium.Color.CYAN,
position : new Cesium.Cartesian3(0.0, 0.0, 1000000.0) // up
});See:
-
Default Value:
true
Methods
Performance:
Calling add is expected constant time. However, the collection's vertex buffer
is rewritten - an O(n) operation that also incurs CPU to GPU overhead. For
best performance, add as many pointPrimitives as possible before calling update.
| Name | Type | Description |
|---|---|---|
options |
object | optional 描述该点属性的模板，如示例 1 所示。 |
Returns:
Throws:
-
DeveloperError : 此对象已被销毁，即已调用 destroy()。
Examples:
// Example 1: Add a point, specifying all the default values.
const p = pointPrimitives.add({
show : true,
position : Cesium.Cartesian3.ZERO,
pixelSize : 10.0,
color : Cesium.Color.WHITE,
outlineColor : Cesium.Color.TRANSPARENT,
outlineWidth : 0.0,
id : undefined
});// Example 2: Specify only the point's cartographic position.
const p = pointPrimitives.add({
position : Cesium.Cartesian3.fromDegrees(longitude, latitude, height)
});See:
| Name | Type | Description |
|---|---|---|
pointPrimitive |
PointPrimitive | optional 要检查的点。 |
Returns:
对象一旦被销毁便不应再使用；调用除
isDestroyed 以外的任何函数都会引发 DeveloperError 异常。因此，
请像示例中那样将返回值（undefined）赋给该对象。
Throws:
-
DeveloperError : 此对象已被销毁，即已调用 destroy()。
Example:
pointPrimitives = pointPrimitives && pointPrimitives.destroy();See:
PointPrimitiveCollection#length 配合使用，
以遍历集合中的所有点。
Performance:
Expected constant time. If points were removed from the collection and
PointPrimitiveCollection#update was not called, an implicit O(n)
operation is performed.
| Name | Type | Description |
|---|---|---|
index |
number | 点的从零开始的索引。 |
Returns:
Throws:
-
DeveloperError : 此对象已被销毁，即已调用 destroy()。
Example:
// Toggle the show property of every point in the collection
const len = pointPrimitives.length;
for (let i = 0; i < len; ++i) {
const p = pointPrimitives.get(i);
p.show = !p.show;
}See:
Returns:
true，否则返回 false。
Performance:
Calling remove is expected constant time. However, the collection's vertex buffer
is rewritten - an O(n) operation that also incurs CPU to GPU overhead. For
best performance, remove as many points as possible before calling update.
If you intend to temporarily hide a point, it is usually more efficient to call
PointPrimitive#show instead of removing and re-adding the point.
| Name | Type | Description |
|---|---|---|
pointPrimitive |
PointPrimitive | 要移除的点。 |
Returns:
true；如果在集合中未找到该点则返回 false。
Throws:
-
DeveloperError : 此对象已被销毁，即已调用 destroy()。
Example:
const p = pointPrimitives.add(...);
pointPrimitives.remove(p); // Returns trueSee:
Performance:
O(n). It is more efficient to remove all the points
from a collection and then add new ones than to create a new collection entirely.
Throws:
-
DeveloperError : 此对象已被销毁，即已调用 destroy()。
Example:
pointPrimitives.add(...);
pointPrimitives.add(...);
pointPrimitives.removeAll();