This code is a simple drawing app that allows the user to draw on a grid. The user can choose between black and white mode, and eraser mode. The size of the grid can be resized by clicking on the "Resize" button.
To use the app, click on the "Clear" button to clear the grid. Then, click on the "BW" or "Eraser" button to select the desired mode. Finally, click and drag on the grid to draw.