ol-proj-ch/dist/proj/common.js

china's gcj02 for openlayers

/*eslint-disable */
/**
 * whether two coordinates are equivalent
 * @param c1 {number[]} coordinate 1
 * @param c2 {number[]} coordinate 2
 * @return {boolean} equals or not
 * */
export var coordsEquals = function (c1, c2) {
    var diff = Math.abs(c1[0] - c2[0]) + Math.abs(c1[1] - c2[1]);
    return diff < 1E-4;
};
/**
 * transform a coordinate between more than two projection
 * projection1 -(f1)-> projection2 -(f2)-> projection3
 *
 * @param f1 {TransformFunction} the first transform
 * @param f2 {TransformFunction} the sconed transform
 * @return {TransformFunction} a new transformation func which can transform a coordinate from projection a to projection b and then projection c
 * */
export var transformChain = function (f1, f2) {
    return function (p0, p1, p2) {
        var tp = f1(p0, undefined, p2);
        return f2(tp, p1, p2);
    };
};
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