mjset.java

Java 语言实现的计算器

	}

	public void mousePressed(MouseEvent e) {
		mx0=e.getX(); my0=e.getY(); // set first point
	}

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

	// implement the two methods in interface MouseMotionListener
	public void mouseMoved(MouseEvent e) {
		int xm=e.getX(),ym=e.getY();

		if(xm<w && ym<h)
			p.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
		else p.setCursor(Cursor.getDefaultCursor());
		if(mj) {
			a=a1+xm*xyr; b=b2-ym*xyr;
			xavl.setText(nfm.format(a)); ybvl.setText(nfm.format(b));
		}
		else {
			x=x1+xm*xyr; y=y2-ym*xyr;
			xavl.setText(nfm.format(x)); ybvl.setText(nfm.format(y));
		}
	}

	public void mouseDragged(MouseEvent e) { // draw temporal shape
		if(drag) drawRectangle(); else drag=true;
		mx=e.getX(); my=e.getY();
		drawRectangle();
	}

	// implement the three methods in interface KeyListener
	public void keyPressed(KeyEvent e) {
		int key=e.getKeyCode();
		if(key==KeyEvent.VK_ESCAPE) esc=true;
	}

	public void keyReleased(KeyEvent e) {}

	public void keyTyped(KeyEvent e) {}


	// implement the single method in interface Runnable
	public void run(){
		setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
		if(mj) drawMJSet(a1,a2,b1,b2); else drawMJSet(x1,x2,y1,y2);
		setCursor(Cursor.getDefaultCursor());
	}

	// method of create thread and start drawing
	void threadDraw() {
		Thread runDraw=new Thread(this);
		runDraw.start();
	}

	// method of drawing xor rectangle
	void drawRectangle() {
		mx1=mx0; my1=my0; mx2=mx; my2=my;
		g=p.getGraphics();
		g.setColor(grayCol);
		g.setXORMode(bgCol);
		if(mx1>mx2) {t=mx1; mx1=mx2; mx2=t;}
		if(my1>my2) {t=my1; my1=my2; my2=t;}
		g.drawRect(mx1,my1,mx2-mx1,my2-my1);
	}

	// method of drawing Mandelbrot set or Julia set
	void drawMJSet(double x1,double x2,double y1,double y2) {
		int i,j,k;
		double x,y,a,b,xx,yy,aa,bb,xr=(x2-x1)/w,yr=(y2-y1)/h;

		d=p.getSize();
		w=d.width; h=d.height;
		xr=(x2-x1)/w; yr=(y2-y1)/h;

		g=p.getGraphics();
		g.setColor(bgCol);
		g.fillRect(0,0,w,h);
		img=new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);
		ig=img.getGraphics();
		ig.setColor(bgCol);
		ig.fillRect(0,0,w,h);
		if(xr>yr) {xyr=xr; h=(int)((y2-y1)/xyr+0.5);}
		else {xyr=yr; w=(int)((x2-x1)/xyr+0.5);}

		for(i=0;i<w;i++) {
			for(j=0;j<h;j++) {
				k=0;
				if(mj){x=x0; y=y0; a=a1+i*xyr; b=b1+j*xyr;}
				else  {a=a0; b=b0; x=x1+i*xyr; y=y1+j*xyr;}
				do {
					xx=x*x-y*y+a; yy=2*x*y+b;
					x=xx; y=yy;
					k++;
					if(k==n) break;
				} while(x*x+y*y<4);
				if(k==n) img.setRGB(i,h-j-1,bw?blckCol:whtCol);
				else img.setRGB(i,h-j-1,randCol?rndCol[k]:stdCol[k%ncol]);
			}
			g.drawImage(img,i,0,1,h,i,0,1,h,null);
			if(esc) {esc=false; break;}
		}
	}

	// method of create color objects
	void setRndCol() {
		int i,red,green,blue;

		rndCol=new int[n];
		Random rndm=new Random(0);
		for(i=0;i<n;i++) {
			red=rndm.nextInt(256);
			green=rndm.nextInt(256);
			blue=rndm.nextInt(256);
			if((red==255 && green==255 && blue==255) || (red==0 && green==0 && blue==0)) i--;
			else rndCol[i]=(red<<16)+(green<<8)+blue;
		}
		rndColSet=true;
	}

	// method of set label's text
	void setLabelText() {
		if(mj) {
			mjl.setText(" Mandelbrot Set ");
			xa0l.setText(" x0:"); xa0vl.setText(nf.format(x0));
			yb0l.setText(" y0:"); yb0vl.setText(nf.format(y0));
			dxal.setText("a:["+nf.format(a1)+","+nf.format(a2)+"]");
			dybl.setText("b:["+nf.format(b1)+","+nf.format(b2)+"]");
			xal.setText(" a:"); ybl.setText(" b:");
		}
		else {
			mjl.setText(" Julia Set ");
			xa0l.setText(" a0:"); xa0vl.setText(nf.format(a0));
			yb0l.setText(" b0:"); yb0vl.setText(nf.format(b0));
			dxal.setText("x:["+nf.format(x1)+","+nf.format(x2)+"]");
			dybl.setText("y:["+nf.format(y1)+","+nf.format(y2)+"]");
			xal.setText(" x:"); ybl.setText(" y:");
		}
	}

	// method of do input dialog
	boolean doDlg() {
		ParamInfo prm=new ParamInfo(this,mj);
		if(dlg==null) dlg=new InputDlg(this,mj);

		if(dlg.showDlg(prm)) {
			if(mj) {
				x0=Double.parseDouble(prm.xa0s); y0=Double.parseDouble(prm.yb0s);
				a1=Double.parseDouble(prm.ax1s); a2=Double.parseDouble(prm.ax2s);
				b1=Double.parseDouble(prm.by1s); b2=Double.parseDouble(prm.by2s);
				if(a2<=a1) a2=a1+0.1; if(b2<=b1) b2=b1+0.1;
			}
			else {
				a0=Double.parseDouble(prm.xa0s); b0=Double.parseDouble(prm.yb0s);
				x1=Double.parseDouble(prm.ax1s); x2=Double.parseDouble(prm.ax2s);
				y1=Double.parseDouble(prm.by1s); y2=Double.parseDouble(prm.by2s);
				if(x2<=x1) x2=x1+0.1; if(y2<=y1) y2=y1+0.1;
			}
			return true;
		}
		return false;
	}
}

// ParamInfo class -- used for change parameters between input dialog and frame
class ParamInfo {
	public String xa0s,yb0s,ax1s,ax2s,by1s,by2s;
	NumberFormat nf=NumberFormat.getNumberInstance();

	public ParamInfo(MJSetFrame frm,boolean mj) {
		nf.setMaximumFractionDigits(8);
		if(mj) {
			xa0s=nf.format(frm.x0); yb0s=nf.format(frm.y0);
			ax1s=nf.format(frm.a1); ax2s=nf.format(frm.a2);
			by1s=nf.format(frm.b1); by2s=nf.format(frm.b2);
		}
		else {
			xa0s=nf.format(frm.a0); yb0s=nf.format(frm.b0);
			ax1s=nf.format(frm.x1); ax2s=nf.format(frm.x2);
			by1s=nf.format(frm.y1); by2s=nf.format(frm.y2);
		}
	}
}

// InputDlg class -- dialog for input parameters
class InputDlg extends JDialog implements ActionListener {
	JTextField xa0tf,yb0tf,ax1tf,ax2tf,by1tf,by2tf;
	JButton okBttn,cancelBttn;
	boolean ok;

	public InputDlg(MJSetFrame frm,boolean mj) {
		super(frm,"Input Parameters",true);
		Container cnt=getContentPane();

		JPanel p1=new JPanel();
		p1.setLayout(new BoxLayout(p1,BoxLayout.X_AXIS));
		Box b1,b2,bs,b3,b4;

		p1.add(Box.createHorizontalStrut(5));
		b1=new Box(BoxLayout.Y_AXIS);
		b1.add(Box.createVerticalStrut(8));
		b1.add(new JLabel(mj?"x0:":"a0:"));
		b1.add(Box.createVerticalStrut(4));
		b1.add(new JLabel(mj?"a1:":"x1:"));
		b1.add(Box.createVerticalStrut(4));
		b1.add(new JLabel(mj?"b1:":"y1:"));
		p1.add(b1);

		b2=new Box(BoxLayout.Y_AXIS);
		b2.add(Box.createVerticalStrut(5));
		b2.add(xa0tf=new JTextField(""));
		b2.add(ax1tf=new JTextField(""));
		b2.add(by1tf=new JTextField(""));
		p1.add(b2);


		p1.add(Box.createHorizontalStrut(10));

		b3=new Box(BoxLayout.Y_AXIS);
		b3.add(Box.createVerticalStrut(8));
		b3.add(new JLabel(mj?"y0:":"b0:"));
		b3.add(Box.createVerticalStrut(4));
		b3.add(new JLabel(mj?"a2:":"x2:"));
		b3.add(Box.createVerticalStrut(4));
		b3.add(new JLabel(mj?"b2:":"y2:"));
		p1.add(b3);

		b4=new Box(BoxLayout.Y_AXIS);
		b4.add(Box.createVerticalStrut(5));
		b4.add(yb0tf=new JTextField(""));
		b4.add(ax2tf=new JTextField(""));
		b4.add(by2tf=new JTextField(""));
		p1.add(b4);

		p1.add(Box.createHorizontalStrut(5));

		cnt.add("Center",p1);

		JPanel p2=new JPanel();
		okBttn=new JButton("OK"); p2.add(okBttn);
		okBttn.addActionListener(this);
		p2.add(new JSeparator(JSeparator.VERTICAL));
		cancelBttn=new JButton("Cancel"); p2.add(cancelBttn);
		cancelBttn.addActionListener(this);
		cnt.add("South",p2);

		setSize(240,140);
		setLocation(200,100);
		setResizable(false);
	}

	public void actionPerformed(ActionEvent e) {
		//Object src=e.getSource();
		if(e.getSource()==okBttn) ok=true; else ok=false;
		setVisible(false);
	}

	public boolean showDlg(ParamInfo prm) {
		xa0tf.setText(prm.xa0s); yb0tf.setText(prm.yb0s);
		ax1tf.setText(prm.ax1s); ax2tf.setText(prm.ax2s);
		by1tf.setText(prm.by1s); by2tf.setText(prm.by2s);
		show();
		if(ok) {
			prm.xa0s=xa0tf.getText(); prm.yb0s=yb0tf.getText();
			prm.ax1s=ax1tf.getText(); prm.ax2s=ax2tf.getText();
			prm.by1s=by1tf.getText(); prm.by2s=by2tf.getText();
		}
		return ok;
	}
}



// MJSet class -- main for draw Mandelbrot set and Julia set
public class MJSet {
	public static void main(String[] args){
		MJSetFrame frame=new MJSetFrame();
		frame.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {System.exit(0);}
		});
		frame.setVisible(true);
	}
}