完成下列功能:

1.板件显示
2.板件选中状态
3.标注显示
4.相机控制.

src/Text.ts

@@ -0,0 +1,45 @@
+import { Font, FontLoader, Mesh, ShapeGeometry, Vector3 } 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("../node_modules/three/examples/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,0.1);
+        let geometry = new ShapeGeometry(shapes);
+
+        geometry.computeBoundingBox();
+
+        super(geometry,ColorMaterial.GetLineMaterial(5));
+
+        let center = geometry.boundingBox.getCenter(new Vector3());
+        this.applyMatrix(MoveMatrix(new Vector3(-center.x,0,0)));
+    }
+}