@math.gl/polygon/dist/utils.js

Polygon/polyline processing utilities

// math.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
export function push(target, source) {
    const size = source.length;
    const startIndex = target.length;
    // dedupe, if source is the same point as the last vertex
    if (startIndex > 0) {
        let isDuplicate = true;
        for (let i = 0; i < size; i++) {
            if (target[startIndex - size + i] !== source[i]) {
                isDuplicate = false;
                break;
            }
        }
        if (isDuplicate) {
            return false;
        }
    }
    for (let i = 0; i < size; i++) {
        target[startIndex + i] = source[i];
    }
    return true;
}
export function copy(target, source) {
    const size = source.length;
    for (let i = 0; i < size; i++) {
        target[i] = source[i];
    }
}
export function getPointAtIndex(positions, index, size, offset, out = []) {
    const startI = offset + index * size;
    for (let i = 0; i < size; i++) {
        out[i] = positions[startI + i];
    }
    return out;
}
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