Pen Tool

The Pen Tool allows the user to add freehand notes and drawings to the Graphics View. This makes the Pen Tool particularly useful when using GeoGebra for presentations or with multimedia interactive whiteboards. To add a freehand note onto a selected region of the Graphics View, draw a rectangle with the Move Tool first, or select an existing image first to draw into it. To finish, select another tool.

GeoGebra stores the notes you have traced in the Graphic View as an image, so you can do any image operations with it (move, rotate, delete, etc.).

The default color of the pen is black, but you can change the pen properties (color, style, and thickness) using the Styling Bar, selecting the first little icon displayed on the Graphics View bar.

Erasing

To erase a portion of your notes created in the Graphic View with the Pen Tool, press and hold the right mouse button while moving it on the notes you want to delete. Erasing is completed when you release the mouse button.
In order to delete the image in which your freehand drawings are stored, activate showing of Auxiliary objects in the Algebra View. There you'll find the picture name, e.g. pic1. Right click on the picture name, then select Delete from the appearing context menu.