import Constant from "../Constant";
import { dataService } from "./DataService";
const orthoBase = 10;
const maxSize = 800; //模型最大占据像素

export default class CameraService {
  constructor() {
    this.aspect = Constant.cadImg_Width / Constant.cadImg_Height;
    this.top = null;
    this.bottom = null;
    this.left = null;
    this.right = null;
  }

  //modelSize:{x,y,z}
  getCurrentScale(modelSize) {
    let angle = dataService.getAngle();
    modelSize = modelSize.clone().applyEuler(new THREE.Euler(0, angle, 0));
    var n = Math.max(
      Math.abs(modelSize.x),
      Math.abs(modelSize.z) * this.aspect
    ); //视口宽高比 >= 1 情况下，模型所占最大视口尺寸
    let screenSize = Math.min(
      Constant.cadImg_Width / Constant.ratio,
      Constant.cadImg_Height / Constant.ratio
    );
    let ratio = Math.max((screenSize * 1.2) / maxSize, 1.2);
    let currentScale = (n / 2 / orthoBase) * ratio; //根据模型所占最大视口尺寸调整缩放

    return currentScale;
  }

  setCamera(currentScale) {
    let cameraLeft = -10 * currentScale;
    let cameraRight = 10 * currentScale;
    let cameraTop = (10 * currentScale) / this.aspect;
    let cameraBottom = (-10 * currentScale) / this.aspect;

    this.top = cameraTop;
    this.bottom = cameraBottom;
    this.left = cameraLeft;
    this.right = cameraRight;
  }
}

const cameraService = new CameraService();
export { cameraService };