import { Font, FontLoader, Mesh, ShapeGeometry, Vector3, Shape } from "three";
import { ColorMaterial } from "./ColorPalette";
import { MoveMatrix } from "./GeUtils";

class FontLoaderUtil
{
  private static defFont: Font;
  static Load(): Font
  {
    if (!this.defFont)
    {
      const f = require("../resources/fonts/helvetiker_regular.typeface.json");
      let loader = new FontLoader();
      this.defFont = loader.parse(f);
    }
    return this.defFont;
  }
}

export class DbText extends Mesh
{
  /**
   *
   * 构造一个文本对象,8位点(中心点下面)在0点
   * @param {string} str 数字字符串
   * @param {number} height 文本高度
   * @memberof DbText
   */
  constructor(str: string, height: number = 5)
  {
    let font = FontLoaderUtil.Load();

    let shapes: THREE.Shape[] = font.generateShapes(str, height);
    let geometry = new ShapeGeometry(shapes);

    geometry.computeBoundingBox();

    super(geometry, ColorMaterial.GetBasicMaterial(5));

    let center = geometry.boundingBox.getCenter(new Vector3());
    this.applyMatrix4(MoveMatrix(new Vector3(-center.x, 0, 0)));
  }
}