@antv/util/lib/matrix/angle-to.js

<h1 align="center">@antv/util</h1>

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.angleTo = angleTo;
var gl_matrix_1 = require("gl-matrix");
var direction_1 = require("./direction");
/**
 * 二维向量 v1 到 v2 的夹角
 * @param v1
 * @param v2
 * @param direct
 */
function angleTo(v1, v2, direct) {
    var ang = gl_matrix_1.vec2.angle(v1, v2);
    var angleLargeThanPI = (0, direction_1.direction)(v1, v2) >= 0;
    if (direct) {
        if (angleLargeThanPI) {
            return Math.PI * 2 - ang;
        }
        return ang;
    }
    if (angleLargeThanPI) {
        return ang;
    }
    return Math.PI * 2 - ang;
}
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