- Run the CustomSelectedComponent sample below which draws 4 letters and sets UI scale to floating point value 1.5 
- Click mouse on the second letter.
The letter is repainted with different color.
The resulted repainted letter is shifted to one pixel left.

See the screenshots:
custom-component.png - initial component
custom-component-selected - the second letter is repainted and shifted to one pixel left

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import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class CustomSelectedComponent {

    private static final int W = 40;
    private static final int H = 60;
    private static float SCALE = 1.5f;

    static class CustomPanel extends JPanel {

        static final Color DRAW_COLOR = Color.PINK;
        static final Color REDRAW_COLOR = Color.MAGENTA;
        final int w;
        final int h;
        boolean redraw = false;

        public CustomPanel(int w, int h) {
            super(new FlowLayout());
            this.w = w;
            this.h = h;

            addMouseListener(new MouseAdapter() {

                @Override
                public void mousePressed(MouseEvent e) {
                    int x = e.getX();
                    int y = e.getY();
                    int xx = 0;
                    int yy = 0;
                    if (x < w) {
                        redraw = true;
                    } else if (x < 2 * w) {
                        redraw = true;
                        xx = w;
                        yy = 0;
                    } else {
                        redraw = false;
                    }

                    if (redraw) {
                        repaint(xx - 1, yy - 1, w + 2, h + 2);
                    } else {
                        repaint();
                    }
                }
            });
        }

        @Override
        public void paint(Graphics g) {
            super.paint(g);
            int w2 = 2 * w;
            int h2 = 2 * h;

            g.setColor(redraw ? REDRAW_COLOR : DRAW_COLOR);
            g.drawLine(0, 0, w2, 0);
            g.drawLine(0, 0, 0, h2);
            g.drawLine(w2, 0, w2, h2);
            g.drawLine(0, h2, w2, h2);
            g.drawLine(w, 0, w, h2);
            g.drawLine(0, h, w2, h);
            paintLetter(g, 0, 0);
            paintLetter(g, w, 0);
            paintLetter(g, 0, h);
            paintLetter(g, w, h);
        }

        private void paintLetter(Graphics g, int x, int y) {
            int w_2 = w / 2;
            int w_4 = w / 4;
            int h_2 = h / 2;
            g.drawLine(x + w_2, y, x, y + h);
            g.drawLine(x + w_2, y, x + w, y + h);
            g.drawLine(x + w_4, y + h_2, x + w_4 + w_2, y + h_2);
        }
    }

    public static void main(String[] args) {

        System.setProperty("sun.java2d.uiScale", Float.toString(SCALE));

        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame();
            frame.setSize(300, 300);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            JPanel panel = new CustomPanel(W, H);
            frame.getContentPane().add(panel);
            frame.setVisible(true);
        });
    }
}
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