Add scalable image feature

src/file/drawing/inline/extent/extent.ts

@@ -2,14 +2,23 @@ import { XmlComponent } from "file/xml-components";
 import { ExtentAttributes } from "./extent-attributes";
 
 export class Extent extends XmlComponent {
+    private attributes: ExtentAttributes;
+
     constructor(x: number, y: number) {
         super("wp:extent");
 
-        this.root.push(
-            new ExtentAttributes({
-                cx: x,
-                cy: y,
-            }),
-        );
+        this.attributes = new ExtentAttributes({
+            cx: x,
+            cy: y,
+        });
+
+        this.root.push(this.attributes);
+    }
+
+    public setXY(x: number, y: number): void {
+        this.attributes.set({
+            cx: x,
+            cy: y,
+        });
     }
 }