org.cesiumjs.cs.core

Class Intersections2D

java.lang.Object

org.cesiumjs.cs.core.Intersections2D

@JsType(isNative=true,
        namespace="Cesium",
        name="Intersections2D")
public class Intersections2D
extends Object

Contains functions for operating on 2D triangles.

Author:

Serge Silaev aka iSergio

Constructor Summary

Constructors

Constructor and Description
Intersections2D()

Method Summary

Modifier and Type	Method and Description
static double[]	clipTriangleAtAxisAlignedThreshold(double threshold, boolean keepAbove, double u0, double u1, double u2) Splits a 2D triangle at given axis-aligned threshold value and returns the resulting polygon on a given side of the threshold.
static double[]	clipTriangleAtAxisAlignedThreshold(double threshold, boolean keepAbove, double u0, double u1, double u2, double[] result) Splits a 2D triangle at given axis-aligned threshold value and returns the resulting polygon on a given side of the threshold.
static Cartesian3	computeBarycentricCoordinates(double x, double y, double x1, double y1, double x2, double y2, double x3, double y3) Compute the barycentric coordinates of a 2D position within a 2D triangle.
static Cartesian3	computeBarycentricCoordinates(double x, double y, double x1, double y1, double x2, double y2, double x3, double y3, Cartesian3 result) Compute the barycentric coordinates of a 2D position within a 2D triangle.
static Cartesian2	computeLineSegmentLineSegmentIntersection(double x00, double y00, double x01, double y01, double x10, double y10, double x11, double y11) Compute the intersection between 2 line segments
static Cartesian2	computeLineSegmentLineSegmentIntersection(double x00, double y00, double x01, double y01, double x10, double y10, double x11, double y11, Cartesian2 result) Compute the intersection between 2 line segments

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Intersections2D

public Intersections2D()

Method Detail

clipTriangleAtAxisAlignedThreshold

@JsMethod
public static double[] clipTriangleAtAxisAlignedThreshold(double threshold,
                                                                    boolean keepAbove,
                                                                    double u0,
                                                                    double u1,
                                                                    double u2)

Splits a 2D triangle at given axis-aligned threshold value and returns the resulting polygon on a given side of the threshold. The resulting polygon may have 0, 1, 2, 3, or 4 vertices.

Parameters:

threshold - The threshold coordinate value at which to clip the triangle.

keepAbove - true to keep the portion of the triangle above the threshold, or false to keep the portion below.

u0 - The coordinate of the first vertex in the triangle, in counter-clockwise order.

u1 - The coordinate of the second vertex in the triangle, in counter-clockwise order.

u2 - The coordinate of the third vertex in the triangle, in counter-clockwise order.

Returns:

The polygon that results after the clip, specified as a list of vertices. The vertices are specified in counter-clockwise order. Each vertex is either an index from the existing list (identified as a 0, 1, or 2) or -1 indicating a new vertex not in the original triangle. For new vertices, the -1 is followed by three additional numbers: the index of each of the two original vertices forming the line segment that the new vertex lies on, and the fraction of the distance from the first vertex to the second one.

clipTriangleAtAxisAlignedThreshold

@JsMethod
public static double[] clipTriangleAtAxisAlignedThreshold(double threshold,
                                                                    boolean keepAbove,
                                                                    double u0,
                                                                    double u1,
                                                                    double u2,
                                                                    double[] result)

Splits a 2D triangle at given axis-aligned threshold value and returns the resulting polygon on a given side of the threshold. The resulting polygon may have 0, 1, 2, 3, or 4 vertices.

Parameters:

threshold - The threshold coordinate value at which to clip the triangle.

keepAbove - true to keep the portion of the triangle above the threshold, or false to keep the portion below.

u0 - The coordinate of the first vertex in the triangle, in counter-clockwise order.

u1 - The coordinate of the second vertex in the triangle, in counter-clockwise order.

u2 - The coordinate of the third vertex in the triangle, in counter-clockwise order.

result - The array into which to copy the result. If this parameter is not supplied, a new array is constructed and returned.

Returns:

The polygon that results after the clip, specified as a list of vertices. The vertices are specified in counter-clockwise order. Each vertex is either an index from the existing list (identified as a 0, 1, or 2) or -1 indicating a new vertex not in the original triangle. For new vertices, the -1 is followed by three additional numbers: the index of each of the two original vertices forming the line segment that the new vertex lies on, and the fraction of the distance from the first vertex to the second one.

computeBarycentricCoordinates

@JsMethod
public static Cartesian3 computeBarycentricCoordinates(double x,
                                                                 double y,
                                                                 double x1,
                                                                 double y1,
                                                                 double x2,
                                                                 double y2,
                                                                 double x3,
                                                                 double y3)

Compute the barycentric coordinates of a 2D position within a 2D triangle.

Parameters:

x - The x coordinate of the position for which to find the barycentric coordinates.

y - The y coordinate of the position for which to find the barycentric coordinates.

x1 - The x coordinate of the triangle's first vertex.

y1 - The y coordinate of the triangle's first vertex.

x2 - The x coordinate of the triangle's second vertex.

y2 - The y coordinate of the triangle's second vertex.

x3 - The x coordinate of the triangle's third vertex.

y3 - The y coordinate of the triangle's third vertex.

Returns:

The barycentric coordinates of the position within the triangle.

computeBarycentricCoordinates

@JsMethod
public static Cartesian3 computeBarycentricCoordinates(double x,
                                                                 double y,
                                                                 double x1,
                                                                 double y1,
                                                                 double x2,
                                                                 double y2,
                                                                 double x3,
                                                                 double y3,
                                                                 Cartesian3 result)

Compute the barycentric coordinates of a 2D position within a 2D triangle.

Parameters:

x - The x coordinate of the position for which to find the barycentric coordinates.

y - The y coordinate of the position for which to find the barycentric coordinates.

x1 - The x coordinate of the triangle's first vertex.

y1 - The y coordinate of the triangle's first vertex.

x2 - The x coordinate of the triangle's second vertex.

y2 - The y coordinate of the triangle's second vertex.

x3 - The x coordinate of the triangle's third vertex.

y3 - The y coordinate of the triangle's third vertex.

result - The instance into to which to copy the result. If this parameter is undefined, a new instance is created and returned.

Returns:

The barycentric coordinates of the position within the triangle.

computeLineSegmentLineSegmentIntersection

@JsMethod
public static Cartesian2 computeLineSegmentLineSegmentIntersection(double x00,
                                                                             double y00,
                                                                             double x01,
                                                                             double y01,
                                                                             double x10,
                                                                             double y10,
                                                                             double x11,
                                                                             double y11)

Compute the intersection between 2 line segments

Parameters:

x00 - The x coordinate of the first line's first vertex.

y00 - The y coordinate of the first line's first vertex.

x01 - The x coordinate of the first line's second vertex.

y01 - The y coordinate of the first line's second vertex.

x10 - The x coordinate of the second line's first vertex.

y10 - The y coordinate of the second line's first vertex.

x11 - The x coordinate of the second line's second vertex.

y11 - The y coordinate of the second line's second vertex.

Returns:

The intersection point, undefined if there is no intersection point or lines are coincident.

computeLineSegmentLineSegmentIntersection

@JsMethod
public static Cartesian2 computeLineSegmentLineSegmentIntersection(double x00,
                                                                             double y00,
                                                                             double x01,
                                                                             double y01,
                                                                             double x10,
                                                                             double y10,
                                                                             double x11,
                                                                             double y11,
                                                                             Cartesian2 result)

Compute the intersection between 2 line segments

Parameters:

x00 - The x coordinate of the first line's first vertex.

y00 - The y coordinate of the first line's first vertex.

x01 - The x coordinate of the first line's second vertex.

y01 - The y coordinate of the first line's second vertex.

x10 - The x coordinate of the second line's first vertex.

y10 - The y coordinate of the second line's first vertex.

x11 - The x coordinate of the second line's second vertex.

y11 - The y coordinate of the second line's second vertex.

result - The instance into to which to copy the result. If this parameter is undefined, a new instance is created and returned.

Returns:

The intersection point, undefined if there is no intersection point or lines are coincident.