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/Dimension.ts

@@ -0,0 +1,58 @@
+import { Group, Geometry, Vector3, Line, Matrix4 } from "three";
+import { ColorMaterial } from "./ColorPalette";
+import { DbText } from "./Text";
+import { MoveMatrix } from "./GeUtils";
+
+/**
+ * 标注实体
+ * 
+ * @export
+ * @class Dimension
+ * @extends {Group}
+ */
+export class Dimension extends Group
+{
+
+    constructor(length: number, textHeight: number = 25, mirror: boolean = false, mirrorFoot: boolean = false)
+    {
+        super();
+        let footLength = 60;
+        if (mirrorFoot)
+        {
+            footLength = -footLength;
+        }
+
+        //针脚几何体
+        let lineGeo = new Geometry();
+        lineGeo.vertices.push(new Vector3(), new Vector3(0, footLength, 0));
+
+        //托盘几何体
+        let lineGeo2 = new Geometry();
+        lineGeo2.vertices.push(new Vector3(0, footLength), new Vector3(length, footLength, 0));
+
+        let material = ColorMaterial.GetLineMaterial(5)
+
+        let line1 = new Line(lineGeo, material);
+        let line2 = new Line(lineGeo, material);
+        line2.position.x = length;
+
+        let line3 = new Line(lineGeo2, material);
+
+        let text = new DbText(parseFloat(length.toFixed(2)).toString(), textHeight);
+        if (mirror)
+        {
+            let roMat = new Matrix4().makeRotationZ(Math.PI);
+            text.applyMatrix(roMat);
+            text.applyMatrix(MoveMatrix(new Vector3(length * 0.5, footLength - textHeight * 0.1)));
+        }
+        else
+        {
+            text.applyMatrix(MoveMatrix(new Vector3(length * 0.5, footLength * 1.1)));
+        }
+
+
+        this.add(text);
+
+        this.add(line1, line2, line3);
+    }
+}