Quelle API utiliser ?

Tu as l'air de souhaiter quelque chose de relativement personnalisable.
Je pense que tu peux utiliser directement JAVA 2D par contre en effet, tu partiras d'une base vierge et il faudra tout faire à la mano.
Cela dit, c'est un excellent exercice !

Voilà un petit exemple que j'avais réaliser en réponse à un autre post.
Ce n'est pas ce que tu souhaites réaliser, mais ca donne un exemple de ce qu'il est possible de faire en peu de code :
Code:
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import java.awt.AWTException;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferedImage;
import java.text.DecimalFormat;
import java.text.NumberFormat;
 
import javax.swing.*;
 
@SuppressWarnings("serial")
public class RegleEcran extends JFrame implements MouseMotionListener, MouseListener {
	private int x, y, x_start_point, y_start_point;
	private NumberFormat nf = new DecimalFormat("#.00");
	private final static Font LEGENDE = new Font("Sans Serif, Helvetica, Arial", Font.ROMAN_BASELINE, 10);
	private BufferedImage image=null;
 
	public RegleEcran () {
		x_start_point=-1;
		y_start_point=-1;
 
		addMouseMotionListener(this);
		addMouseListener(this);
		setUndecorated(true);
	}
 
	public void setImage(BufferedImage image){
		this.image = image;
	}
 
	@Override
	public void paint(Graphics g) {
		super.paint(g);
 
		Graphics2D g2d = (Graphics2D)g;
		g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
 
		if(image!= null){
			g2d.drawImage(image, 0, 0, this);
		}
 
		if(x_start_point!=-1){
			// ligne
			g2d.setColor(Color.RED);
			g2d.drawLine(x_start_point, y_start_point, x, y);
 
			// croix
			g2d.setColor(Color.WHITE);
			g2d.setStroke(new BasicStroke(3));
			g2d.drawLine(x_start_point, y_start_point-3, x_start_point, y_start_point+3);
			g2d.drawLine(x_start_point-3, y_start_point, x_start_point+3, y_start_point);
			g2d.drawLine(x, y-3, x, y+3);
			g2d.drawLine(x-3, y, x+3, y);
 
			g2d.setColor(Color.BLACK);
			g2d.setStroke(new BasicStroke(1));
			g2d.drawLine(x_start_point, y_start_point-3, x_start_point, y_start_point+3);
			g2d.drawLine(x_start_point-3, y_start_point, x_start_point+3, y_start_point);
			g2d.drawLine(x, y-3, x, y+3);
			g2d.drawLine(x-3, y, x+3, y);
 
			// legendes
			g2d.setColor(new Color(127,127,127,127));
			g2d.fillRect(x_start_point-60, y_start_point, 50, 35);
			g2d.fillRect(x+10, y, 72, 95);
 
			g2d.setColor(Color.BLACK);
			g2d.setFont(LEGENDE);
 
			g2d.drawString("x : " + (x_start_point), x_start_point-55, y_start_point+15);
			g2d.drawString("y : " + (y_start_point), x_start_point-55, y_start_point+27);
 
			g2d.drawString("x : " + (x), x+15, y+15);
			g2d.drawString("y : " + (y), x+15, y+27);
 
			g2d.drawString("h : " + (x - x_start_point), x+15, y+45);
			g2d.drawString("v : " + (y - y_start_point), x+15, y+57);
 
			g2d.drawString("° : " + nf.format(-(Math.toDegrees(Math.atan2(y-y_start_point , x-x_start_point)))), x+15, y+75);			
			g2d.drawString("d : " + nf.format((Math.sqrt(Math.pow((x - x_start_point),2)+Math.pow((y - y_start_point),2)))), x+15, y+87);
		}
	}
 
	// Listeners
	public void mouseDragged(MouseEvent e) {
		x = e.getX();
		y = e.getY();
		repaint();
	}
 
	public void mouseMoved(MouseEvent e) {}
 
	public void mouseClicked(MouseEvent e) {}
 
	public void mouseEntered(MouseEvent e) {}
 
	public void mouseExited(MouseEvent e) {}
 
	public void mousePressed(MouseEvent e) {
		x_start_point=e.getX();
		y_start_point=e.getY();
		x = e.getX();
		y = e.getY();
		repaint();		
	}
 
	public void mouseReleased(MouseEvent e) {}
 
	// Main
	public static void main(String[] args) throws AWTException {
		RegleEcran frame = new RegleEcran();
 
		Toolkit leKit = frame.getToolkit();
		Dimension tailleFenetre = leKit.getScreenSize();
 
		Rectangle screenRect = new Rectangle(tailleFenetre);
		//creer le screenshot
		Robot robot = new Robot();
		BufferedImage image = robot.createScreenCapture(screenRect);
 
		frame.setImage(image);
		frame.setBounds(0, 0, tailleFenetre.width, tailleFenetre.height);
		frame.setVisible(true);
		Cursor main = new Cursor(Cursor.CROSSHAIR_CURSOR);
		frame.setCursor(main);
 
	}
}