feature: generate pdf from actor

src/elements/blank.ts

@@ -0,0 +1,29 @@
+import { AbstractElement } from './abstract-element';
+import jsPDF from 'jspdf';
+import { Box } from './box';
+
+export class Blank extends Box {
+  constructor(x: number, y: number, w: number, h: number) {
+    super(x, y, w, h);
+  }
+
+  public static heightBlank(h: number) {
+    return new Blank(0, 0, 0, h);
+  }
+
+  public getCheckNewPageHeight(doc?: jsPDF): number {
+    return this.getHeight(doc);
+  }
+
+  public prepareRender(doc: jsPDF, _maxWidth?: number): jsPDF {
+    return doc;
+  }
+
+  public render(doc: jsPDF, _maxWidth?: number): jsPDF {
+    return doc;
+  }
+
+  public getElements(): AbstractElement[] {
+    return [this];
+  }
+}