3d

3d 辅助函数

rotatePoint

旋转平面 x y 轴，xy 坐标 3d 旋转，3d 旋转时使用

const mapRotate = {
  rx: 35,
  ry: 15,
  rz: -15,
};
const mapCenterXY = [103.001033, 30.659462];
const projection = {
  project: (point: number[]) =>
    rotatePoint(
      [
        (point[0] / 180) * Math.PI,
        -Math.log(Math.tan((Math.PI / 2 + (point[1] / 180) * Math.PI) / 2)),
      ],
      mapCenterXY,
      mapRotate.rx,
      mapRotate.ry,
      mapRotate.rz
    ),
  unproject: (point: number[]) => {
    const reversePoint = rotatePoint(
      point,
      mapCenterXY,
      -mapRotate.rx,
      -mapRotate.ry,
      -mapRotate.rz
    );
    return [
      (reversePoint[0] * 180) / Math.PI,
      ((2 * 180) / Math.PI) * Math.atan(Math.exp(reversePoint[1])) - 90,
    ];
  },
};