Add examples and refactor code

Add examples and refactor code

Example/examples.js

@@ -0,0 +1,17 @@
+import * as Svg from './examples/Svg';
+import * as Rect from './examples/Rect';
+import * as Circle from './examples/Circle';
+import * as Ellipse from './examples/Ellipse';
+import * as Line from './examples/Line';
+import * as Polygon from './examples/Polygon';
+import * as Polyline from './examples/Polyline';
+
+export {
+    Svg,
+    Rect,
+    Circle,
+    Ellipse,
+    Line,
+    Polygon,
+    Polyline
+};