How to use Eraser and Undo?

[duongxinh2003]

Anyone can help me how to use eraser and undo path? Thanks!

[winthesky]

eraser like this:

    public JButton getEraserButton() {
        if (eraserButton == null) {
            eraserButton = new JButton("eraser");
            eraserButton.addActionListener(e -> {
                deactivateTool();
                activeTool = PaintToolBuilder.create(PaintToolType.ERASER)
                        .makeActiveOnCanvas(getImageCanvas())
                        .withStroke(StrokeBuilder.withShape().ofRectangle(20, 20).build())
                        .build();
            });
        }
        return eraserButton;
    }

undo like this:
canvas.undo();