DrawMandel

    @Override
    public void paintComponent(Graphics g){
        super.paintComponent(g);
        if(isZooming){
            fractal.draw();
            if (zoom!=null){
                Graphics2D g2d = (Graphics2D)g;
                g2d.draw(zoom);
        }
        }
        else{
        fractal = new MandelDrawer(imageDetails, getSize(), g);
        fractal.draw();
        }

MandelDrawer{
private bufImg;
//calculate mandelbrot assign to bufImg

draw(){
g.drawImage(bufImg, 0, 0, null);
}