/**
 * strophoide.java - jpq - 31/01/99
 * jdk1.2 - 22/03/99
 * main() ajouté le 19/12/17. Modifications le 15 et 22/09/22
 */

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import geo.*;

public class strophoide extends Panel implements MouseListener, MouseMotionListener {
	static final long serialVersionUID = 220922L;
	static Repere R;

// on definit ici les objets mathématiques
	static PointLibre O;
	static PointSurDroite P, A;
	static Cercle c;
	static DemiDroite AP;
	static Droite d, xpx, dAP;
	static Pt M, N;
	static Segment PM, PN, PO;
	int gw, gh;

	public strophoide() {
		setBackground (Color.WHITE);
		addMouseMotionListener (this);
		addMouseListener (this);
	}

	public void update (Graphics g) {
		paint (g);
	}

	public void paint (Graphics g) {
		g.setFont (new Font (Font.SANS_SERIF, Font.PLAIN, 10));
		g.setColor (getBackground());
		if (gw != getSize().width || gh != getSize().height) {
			gw = getSize().width;
			gh = getSize().height;

// on initialise ici les objets mathématiques
			if (R == null) {
				R = new Repere (gw / 2, gh / 2, gw, gh, 40.0, 40.0);
				O = new PointLibre (0.0, 0.0);
				xpx = new Droite (0.0, 1.0, 0.0);
				A = new PointSurDroite (1.0, 0.0, xpx);
				d = new Droite (1.0, 0.0, 0.0);
				P = new PointSurDroite (1.0, 1.0, d);
				dAP = new Droite();
				AP = new DemiDroite (A, P);
				c = new Cercle (0.0, P.y, Math.abs (P.y));
				M = new Pt();
				N = new Pt();
				PM = new Segment();
				PN = new Segment();
				PO = new Segment();
			} else {
				R.MAJ (R.X (O.x), R.Y (O.y), gw, gh, R.unitex, R.unitex);
				O.MAJ (0.0, 0.0);
			}
			g.fillRect (0, 0, R.XMAX, R.YMAX);
		}

// on trace dans la couleur du fond les objets liés
		if ((O.deplace) || (A.deplace)) {
			if (O.deplace) {
				R.MAJ (R.X (O.x), R.Y (O.y), gw, gh, R.unitex, R.unitex);
				O.MAJ (0.0, 0.0);
			}
			g.fillRect (0, 0, R.XMAX, R.YMAX);
		} else {
			P.trace ("P", R, g);
			A.trace ("A", R, g);
			M.traceNom ("M", R, g);
			N.traceNom ("N", R, g);
			P.trace ("P", R, g);
			c.trace ("", R, g);
			AP.trace ("", R, g);
			PM.trace ("", R, g);
			PO.trace ("", R, g);
			PN.trace ("", R, g);
		}

// on recalcule les objets liés
		c.MAJ (0.0, P.y, Math.abs (P.y));
		dAP.MAJ (A, P);
		AP.MAJ (A, P);
		Pt[] MNi = Pt.intersection (dAP, c);
		M = MNi [0];
		N = MNi [1];
		PM.MAJ (P, M);
		PN.MAJ (P, N);
		PO.MAJ (P, O);

// on trace
//		g.setColor (Color.BLACK);
//		R.cadre (g);

		g.setColor (Color.YELLOW);
		R.trace (g);


		g.setColor (Color.MAGENTA);
		c.trace ("", R, g);

		g.setColor (Color.CYAN);
		AP.trace ("", R, g);
		
		g.setColor (Color.BLUE);
		PM.trace ("", R, g);
		PO.trace ("", R, g);
		PN.trace ("", R, g);

		g.setColor (Color.BLACK);
		M.trace ("M", R, g);
		N.trace ("N", R, g);

		g.setColor (Color.RED);
		O.trace ("O", R, g);
		A.trace ("A", R, g);
		if (P.deplace)
			P.trace ("", R, g);
		else
			P.trace ("P", R, g);
	}

	public void mousePressed (MouseEvent e) {
		int X = e.getX();
		int Y =  e.getY();
		if (P.deplace = P.zone (X, Y, R)) {
			repaint();
		} else if (A.deplace = A.zone (X, Y, R)) {
		} else if (O.deplace = O.zone (X, Y, R)) {
		}
	}

	public void mouseDragged (MouseEvent e) {
		int X = e.getX();
		int Y =  e.getY();
		P.bouge (X, Y, R);
		A.bouge (X, Y, R);
		O.bouge (X, Y, R);
		repaint();
	}

	public void mouseReleased (MouseEvent e) {
		P.deplace = A.deplace = O.deplace = false;
		repaint();
	}

	public void mouseMoved (MouseEvent e) {
		int X = e.getX();
		int Y = e.getY();
		if (P != null && P.zone (X, Y, R) || A != null && A.zone (X, Y, R) || O != null && O.zone (X, Y, R)) {
			setCursor (new Cursor (Cursor.HAND_CURSOR));
		} else {
			setCursor (new Cursor (Cursor.DEFAULT_CURSOR));
		}
	}

	public void mouseClicked(MouseEvent e) {}
	public void mouseEntered(MouseEvent e) {}
	public void mouseExited(MouseEvent e) {}

	public static void main (String [] args) {
		strophoide s = new strophoide();
		JFrame f = new JFrame ("Strophoïde");
		f.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
		f.add (s);
		f.setSize (600, 600);
		f.setVisible (true);
	}

}