function getColorArray() {
  var array = new Array(
    [new RColor(255, 0, 0), new RColor(255, 0, 0), new RColor(160, 32, 240), new RColor(0, 255, 0),],
    [new RColor(128, 0, 128), new RColor(77, 255, 77), new RColor(200, 96, 255), new RColor(160, 32, 240),],
    [new RColor(255, 153, 77), new RColor(255, 153, 77), new RColor(128, 255, 255), new RColor(0, 255, 255),],
    [new RColor(77, 255, 255), new RColor(77, 255, 255), new RColor(255, 255, 128), new RColor(255, 255, 0),],
    [new RColor(148, 121, 253), new RColor(148, 121, 253), new RColor(255, 192, 128), new RColor(255, 165, 0),]
  );
  return array;
}
/** 随机获取预设颜色中的一种 */
function randomColorSingle() {
  var array = randomColor();
  return array[Math.floor(Math.random() * array.length)];
}
/** 随机获取预设颜色的一组颜色 */
function randomColorArray() {
  var array = getColorArray();
  return array[Math.floor(Math.random() * array.length)];
}
/** 已知圆上两点的坐标及半径，求圆心的坐标 */
function getRoundCenter(x1, y1, x2, y2, r, reversed) {
  // 两点的中点
  var midX = (x1 + x2) / 2;
  var midY = (y1 + y2) / 2;
  // 两点间的距离 d
  var d = Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));
  // 圆心坐标 (h, k)
  var cx = midX + (reversed > 0 ? 1 : -1) * Math.sqrt(Math.pow(r, 2) - Math.pow(d / 2, 2)) * (y1 - y2) / d;
  var cy = midY + (reversed > 0 ? 1 : -1) * Math.sqrt(Math.pow(r, 2) - Math.pow(d / 2, 2)) * (x2 - x1) / d;
  return [cx, cy];
}
/** 已知圆心和圆上一点的坐标，求圆上一点和圆心之间的角度 */
function calculateAngle(cx, cy, px, py) {
  var dx = px - cx;
  var dy = py - cy;
  var theta = Math.atan2(dy, dx);
  var degrees = (theta * 180) / Math.PI;
  return (degrees + 360) % 360;
}
/** 已知圆的半径和角度，就弧长 */
function calculateArcLength(radius, angle) {
  // 将角度转换为弧度
  // var angleInRadians = (angle * Math.PI) / 180;
  // 计算弧长
  return radius * deg2rad(angle);
}
/** 已知A,B,C,D 四个坐标，就AB和CD相交的交点坐标 */
function lineCrossoverPoint(A, B, C, D) {
  var Ax = A[0];
  var Ay = A[1];
  var Bx = B[0];
  var By = B[1];
  var Cx = C[0];
  var Cy = C[1];
  var Dx = D[0];
  var Dy = D[1];
  var m1 = (By - Ay) / (Bx - Ax);
  var m2 = (Dy - Cy) / (Dx - Cx);
  var b1 = Ay - m1 * Ax;
  var b2 = Cy - m2 * Cx;
  var intersectionX = (b2 - b1) / (m1 - m2);
  var intersectionY = m1 * intersectionX + b1;
  return [intersectionX, intersectionY];
}
/** 已知A、B两点，求AB连接与x轴的夹角度数 */
function getLineAngle(origin, target) {
  var x1 = origin[0];
  var y1 = origin[1];
  var x2 = target[0];
  var y2 = target[1];
  var theta = Math.atan((y2 - y1) / (x2 - x1));
  var angle = rad2deg(theta);
  // 将角度调整到 0 到 180 度范围内
  angle += 180;
  return angle % 180;
}
/** 已知AB两点，得到{ "drift": A->B的偏移量, "angle": A->B的偏移角度, "vertical": A->B的垂直方向偏移量, "vertical_angle": A->B的垂直方向偏角度 } */
function computeOffset(origin, target) {
  var x1 = origin[0];
  var y1 = origin[1];
  var x2 = target[0];
  var y2 = target[1];
  // 0°至180°
  var angle = getLineAngle(origin, target);
  var drift_x = (x1 - x2 > 0 ? -1 : 1) * Math.abs(Math.cos(deg2rad(angle)));
  var drift_y = (y1 - y2 > 0 ? -1 : 1) * Math.abs(Math.sin(deg2rad(angle)));
  // -90° 至 90°
  var vAngle = angle - 90;
  var vertical_x = Math.abs(Math.cos(deg2rad(vAngle)));
  var vertical_y = (vAngle > 0 ? 1 : -1) * Math.abs(Math.sin(deg2rad(vAngle)));
  return { "drift": [drift_x, drift_y], "angle": angle, "vertical": [vertical_x, vertical_y], "vertical_angle": vAngle }
}
/** 通过文件路径file，获取文件名称 */
function getFileName(file) {
  if (!file) {
    return "";
  }
  var match = file.toString().match(/\/([^\/]+)$/);
  return match ? match[1] : null;
}
/** 生成图层的名称 统一格式 */
function getLayername(prefix, filePath) {
  return (prefix || "Other") + "-" + Math.floor(Math.random() * 100) + "-" + getFileName(filePath);
}
/** 格式化输出当前时间 */
function formatDateTime() {
  var now = new Date();

  var year = now.getFullYear();
  var month = String(now.getMonth() + 1).padStart(2, '0');
  var day = String(now.getDate()).padStart(2, '0');

  var hours = String(now.getHours()).padStart(2, '0');
  var minutes = String(now.getMinutes()).padStart(2, '0');
  var seconds = String(now.getSeconds()).padStart(2, '0');
  return year + "-" + month + "-" + day + " " + hours + ":" + minutes + ":" + seconds;
}
/** 格式化桩号 格式：K000+000.000 */
function formatStake(middleX) {
  var m = (round(middleX * 1000) / 1000);
  var mk = Math.floor(m / 1000);
  return "K" + mk.toString() + "+" + (round((middleX - mk * 1000) * 1000) / 1000).toString();
}