PolygonPipeline

Methods

<static> computeArea2D

DOC_TBA

Throws:

• DeveloperError : positions is required.
• DeveloperError : At least three positions are required.

<static> computeSubdivision

Subdivides positions and raises points to the surface of the ellipsoid.

Parameters:

Name	Type	Argument	Default	Description
positions	Array			An array of Cartesian3 positions of the polygon.
indices	Array			An array of indices that determines the triangles in the polygon.
granularity	Number	<optional>	CesiumMath.RADIANS_PER_DEGREE	The distance, in radians, between each latitude and longitude. Determines the number of positions in the buffer.

Throws:

• DeveloperError : positions is required.
• DeveloperError : indices is required.
• DeveloperError : At least three indices are required.
• DeveloperError : The number of indices must be divisable by three.
• DeveloperError : Granularity must be greater than zero.

<static> computeWindingOrder2D

DOC_TBA

Throws:

• DeveloperError : positions is required.
• DeveloperError : At least three positions are required.

Returns:

WindingOrder DOC_TBA

<static> eliminateHoles

Given a polygon defined by an outer ring with one or more inner rings (holes), return a single list of points representing a polygon defined by the outer ring with the inner holes removed.

Parameters:

Name	Type	Description
outerRing	Array	An array of Cartesian points defining the outer boundary of the polygon.
innerRings	Array	An array of arrays of Cartesian points, where each array represents a hole in the polygon.

Throws:

• DeveloperError : outerRing is required.
• DeveloperError : outerRing must not be empty.
• DeveloperError : innerRings is required.

Returns:

A single list of Cartesian points defining the polygon, including the eliminated inner ring.

Example

// Simplifying a polygon with multiple holes.
outerRing = PolygonPipeline.eliminateHoles(outerRing, innerRings);
polygon.setPositions(outerRing);

<static> removeDuplicates

DOC_TBA Cleans up a simple polygon by removing duplicate adjacent positions and making the first position not equal the last position.

Throws:

• DeveloperError : positions is required.
• DeveloperError : At least three positions are required.

<static> scaleToGeodeticHeight

Scales each position of a geometry's position attribute to a height, in place.

Parameters:

Name	Type	Argument	Default	Description
geometry	Geometry			The geometry whose positions are to be scaled.
height	Number	<optional>	0.0	The desired height to add to the positions of the geometry.
ellipsoid	Ellipsoid	<optional>	Ellipsoid.WGS84	The ellipsoid on which the positions lie.
scaleToSurface	Boolean	<optional>	true	true if the positions need to be scaled to the surface before the height is added.

Returns:

Geometry The same geometry whose positions where scaled.

<static> triangulate

Triangulate a polygon

Parameters:

Name	Type	Description
positions	Array	Cartesian2 array containing the vertices of the polygon

Throws:

• DeveloperError : positions is required.
• DeveloperError : At least three positions are required.

Returns:

Array - Index array representing triangles that fill the polygon