package ComplPlane;

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

/**
 * <p>Überschrift: Übung Java</p>
 * <p>Beschreibung: Applet-Beispiel, Darstellung der komplexen
 *    Zahlenebene, MouseClick- und MouseMotion-Events werden über innere 
 *    und anonyme Adapterklassen behandelt. 
 *    Zusätzlich Operatoren und Darstellung des komplexen Winkels.
 * </p>
 * <p>Copyright: (c) 2003</p>
 * <p>Organisation: </p>
 * @author Wolfgang Konen
 * @version 1.0
 */
 
public  class GUIComplexPlane3 extends Applet
{
    static final int I_KONJ=1, I_HOCH2=2, I_HOCH3=3;
	int istate;
	double re;
	double im;
	TextField tfRe;
	TextField tfIm;
	Choice cbox;
	MyWindow win;

	public GUIComplexPlane3() {
		this.re=0.0;
		this.im=0.0;
	}

	public void init() {
//        enableEvents(AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK);
		setBackground(Color.white);
		
		// Einlesen der Initialparameter aus HTML-Datei
		String strRe = getParameter("Realteil");
		String strIm = getParameter("Imagteil");
		if (strRe==null) strRe = "0.0";
		if (strIm==null) strIm = "0.0";
		this.re = Double.valueOf(strRe).doubleValue();
		this.im = Double.valueOf(strIm).doubleValue();
		this.setLayout(null);
		tfRe = new TextField(strRe);
		tfIm = new TextField(strIm);
		this.add(tfRe);
		tfRe.setBounds(107,252,40,20);
		this.add(tfIm);
		tfIm.setBounds(107,272,40,20);
		Label lRe = new Label("Real:");
		lRe.setBounds( 63,252,35,20);
		lRe.setBackground(new Color(250,250,230));
		this.add(lRe);
		Label lIm = new Label("Imag:");
		lIm.setBounds( 63,272,35,20);
		lIm.setBackground(new Color(250,250,230));
		this.add(lIm);
		Label lChoice = new Label("Operator:");
		lChoice.setBounds(50,20,60,20);
		this.add(lChoice);
		cbox = new Choice();
		cbox.setBounds(120,20,90,20);
		cbox.addItem("konjugieren");
		cbox.addItem("Quadrat");
		cbox.addItem("hoch 3");
		cbox.addItemListener(new MyItemListener());
		this.add(cbox);
		cbox.select("konjugieren");
		istate = I_KONJ;
		
		this.addMouseMotionListener(new MouseMotionAdapter() {
			public void mouseDragged(MouseEvent evt) {
				int X = evt.getX();
				int Y = evt.getY();
				re = win.sx(X);
				im = win.sy(Y);
				repaint();
			}
		});
		this.addMouseListener(new MouseAdapter() {
			public void mousePressed(MouseEvent evt) {
				int X = evt.getX();
				int Y = evt.getY();
				re = win.sx(X);
				im = win.sy(Y);
				repaint();
			}
		});
	}
	
	class MyItemListener implements ItemListener {
		public void itemStateChanged(ItemEvent ie) {
			if (ie.getItem().equals("konjugieren")) istate=I_KONJ;
			if (ie.getItem().equals("Quadrat")) istate=I_HOCH2;
			if (ie.getItem().equals("hoch 3")) istate=I_HOCH3;
			repaint();
		}
	}
	
	public void paint(Graphics g)
	{
		int clip = 1;
		int width = getSize().width;
		int height = getSize().height;
		g.setColor(Color.black);
		g.drawRect(clip,clip, width-2*clip, height-2*clip );
		g.setClip(clip,clip,  width - 2*clip, height - 2* clip);
		double xmin=-3.0, xmax=3.0;
		double ymin=-3.0, ymax=3.0;
		this.setBackground(new Color(250,250,230));  // helles gelb
		this.win = new MyWindow(g,xmin,ymin,xmax,ymax);
		
		// Koordinatengitter malen
		for (double i=xmin; i<(xmax+1);i+=0.25) {
			g.setColor(new Color(200,200,250));
			if (i%1.0==0.0) g.setColor(new Color(40,170,40));
			if (i==0.0) g.setColor(Color.blue);
			win.line(i,ymin,i,ymax);
		}
		for (double i=xmin; i<(xmax+1);i+=0.25) {
			g.setColor(new Color(200,200,250));
			if (i%1.0==0.0) g.setColor(new Color(40,170,40));
			if (i==0.0) g.setColor(Color.blue);
			win.line(xmin,i,xmax,i);
		}
		
		// komplexe Zahl zeigen
		g.setColor(Color.red);
		win.line(0.0,0.0,re,im);
		win.point(re,im);
		tfRe.setText(new Double(re).toString());
		tfIm.setText(new Double(im).toString());
		
		// Winkel zeichnen
		double angle = Math.atan2(im,re)/Math.PI*180.0;
		if (angle<0.0) angle = 360.0+angle+1.0;
		win.arc(0,0,0.5,angle);

		// Operation berechnen
		double re2=0.0,im2=0.0;
		switch (istate) {
		case I_KONJ:
			re2=re;
			im2=-im;
			break;
		case I_HOCH2:
			re2 = (re*re)-(im*im);
			im2 = 2*re*im;
			break;
		case I_HOCH3:
			double re22,im22;
			re22 = (re*re)-(im*im);
			im22 = 2*re*im;
			re2 = re22*re - im22*im;
			im2 = re22*im + im22*re;
			break;
		}
		
		// Operand malen
		g.setColor(Color.black);
		win.line(0.0,0.0,re2,im2);
		win.point(re2,im2);
		
		// Winkel zeichnen
		double angle2 = Math.atan2(im2,re2)/Math.PI*180.0;
		if (angle2<0.0) angle2 = 360.0+angle2+1.0;
		win.arc(0,0,0.3,angle2);

                // diese Befehle sind streng verboten in paint():
		//		this.setVisible(true);
		//		this.setSize(600,400);
	}

/* --- obsolet ---	
	// einfache Methode, um auf Events zu reagieren
	public void processMouseEvent(MouseEvent evt)
	{
	    if(evt.getID() == MouseEvent.MOUSE_PRESSED)
		{
			int X = evt.getX();
			int Y = evt.getY();
            this.re = win.sx(X);
			this.im = win.sy(Y);
        	repaint();
		}
		super.processMouseEvent(evt);
	}
	public void processMouseMotionEvent(MouseEvent evt)
	{
	    if(evt.getID() == MouseEvent.MOUSE_DRAGGED)
		{
			int X = evt.getX();
			int Y = evt.getY();
            this.re = win.sx(X);
			this.im = win.sy(Y);
			repaint();
		}
		super.processMouseMotionEvent(evt);
	}}
    --- obsolet --- */

}