package?contour;
/*--------------------------------------------------------------------
File?“ContourPlot.java“:
--------------------------------------------------------------------*/
import?java.awt.*;
import?java.io.*;

//----------------------------------------------------------
//?“ContourPlot“?is?the?most?important?class.?It?is?a
//?user-interface?component?which?parses?the?data?draws
//?the?contour?plot?and?returns?a?string?of?results.
//----------------------------------------------------------
public?class?ContourPlot?extends?Canvas?{

	//?Below?constant?data?members:
	final?static?boolean	SHOW_NUMBERS	=?true;
	final?static?int	BLANK		=?32
				OPEN_SUITE	=?（int）‘{‘
				CLOSE_SUITE	=?（int）‘}‘
				BETWEEN_ARGS	=?（int）‘‘
				N_CONTOURS	=?10
				PLOT_MARGIN	=?20
				WEE_BIT		=??3
				NUMBER_LENGTH	=??3;
	final?static?double	Z_MAX_MAX	=?1.0E+10
				Z_MIN_MIN	=?-Z_MAX_MAX;
	final?static?String?EOL	=
		System.getProperty（“line.separator“）;

	//?Below?data?members?which?store?the?grid?steps
	//?the?z?values?the?interpolation?flag?the?dimensions
	//?of?the?contour?plot?and?the?increments?in?the?grid:
	int		xSteps?ySteps;
	float		z[][];
	boolean		logInterpolation?=?false;
	Dimension	d;
	double		deltaX?deltaY;

	//?Below?data?members?most?of?which?are?adapted?from
	//?Fortran?variables?in?Snyder‘s?code:
	int	ncv?=?N_CONTOURS;
	int	l1[]?=?new?int[4];
	int	l2[]?=?new?int[4];
	int	ij[]?=?new?int[2];
	int	i1[]?=?new?int[2];
	int	i2[]?=?new?int[2];
	int	i3[]?=?new?int[6];
	int	ibkeyicurjcuriijjelleixiedgeiflagniks;
	int	cntrIndexprevIndex;
	int	idirnxidirk;
	double	z1z2cvalzMaxzMin;
	double	intersect[]	=?new?double[4];
	double	xy[]		=?new?double[2];
	double	prevXY[]	=?new?double[2];
	float	cv[]		=?new?float[ncv];
	boolean	jump;

	//-------------------------------------------------------
	//?A?constructor?method.
	//-------------------------------------------------------
	public?ContourPlot（int?x?int?y）?{
		super（）;
		xSteps?=?x;
		ySteps?=?y;
		setForeground（Color.black）;
		setBackground（Color.white）;
	}

	//-------------------------------------------------------
	int?sign（int?a?int?b）?{
		a?=?Math.abs（a）;
		if?（b?		else		return??a;
	}

	//-------------------------------------------------------
	//?“InvalidData“?sets?the?first?two?components?of?the
	//?contour?value?array?to?equal?values?thus?preventing
	//?subsequent?drawing?of?the?contour?plot.
	//-------------------------------------------------------
	void?InvalidData（）?{
		cv[0]?=?（float）0.0;
		cv[1]?=?（float）0.0;
	}

	//-------------------------------------------------------
	//?“GetExtremes“?scans?the?data?in?“z“?in?order
	//?to?assign?values?to?“zMin“?and?“zMax“.
	//-------------------------------------------------------
	void?GetExtremes（）?throws?ParseMatrixException?{
		int	ij;
		double	here;

		zMin?=?z[0][0];
		zMax?=?zMin;
		for?（i?=?0;?i?