PolygonPipeline

Methods

<static> cleanUp

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> computeArea2D

DOC_TBA

Throws:

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

<static> computeSubdivision

DOC_TBA

Parameters:

Name	Type	Argument	Description
positions	DOC_TBA		DOC_TBA
indices	DOC_TBA		DOC_TBA
granularity	Number	<optional>	DOC_TBA

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> earClip2D

DOC_TBA

Throws:

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

<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> scaleToGeodeticHeight

DOC_TBA

Throws:

DeveloperError : ellipsoid is required.

<static> wrapLongitude

Subdivides a Polygon such that no triangles cross the ±180 degree meridian of an ellipsoid.

Parameters:

Name	Type	Description
positions	Array	The Cartesian positions of triangles that make up a polygon.
indices	Array	The indices of positions in the positions array that make up triangles

Throws:

• DeveloperError : positions and indices are required
• DeveloperError : At least three indices are required.
• DeveloperError : The number of indices must be divisable by three.

Returns:

Object The full set of indices, including those for positions added for newly created triangles

Example

var positions = [new Cartesian3(-1, -1, 0), new Cartesian3(-1, 1, 2), new Cartesian3(-1, 2, 2)];
var indices = [0, 1, 2];
indices = PolygonPipeline.wrapLongitude(positions, indices);

See:

• Polygon