Example usage for com.google.common.geometry S2Point add

Introduction

In this page you can find the example usage for com.google.common.geometry S2Point add.

Prototype

public static S2Point add(final S2Point p1, final S2Point p2) 

Source Link

Usage

From source file:org.geosde.cassandra.GeometryTestCase.java

S2Point samplePoint(S2Cap cap) {
    // We consider the cap axis to be the "z" axis. We choose two other axes
    // to//w  w  w .  j a v  a2s .co m
    // complete the coordinate frame.

    S2Point z = cap.axis();
    S2Point x = z.ortho();
    S2Point y = S2Point.crossProd(z, x);

    // The surface area of a spherical cap is directly proportional to its
    // height. First we choose a random height, and then we choose a random
    // point along the circle at that height.

    double h = rand.nextDouble() * cap.height();
    double theta = 2 * S2.M_PI * rand.nextDouble();
    double r = Math.sqrt(h * (2 - h)); // Radius of circle.

    // (cos(theta)*r*x + sin(theta)*r*y + (1-h)*z).Normalize()
    return S2Point.normalize(
            S2Point.add(S2Point.add(S2Point.mul(x, Math.cos(theta) * r), S2Point.mul(y, Math.sin(theta) * r)),
                    S2Point.mul(z, (1 - h))));
}

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