JSci.swing.JLineTrace Maven / Gradle / Ivy

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JSci is a set of open source Java packages. The aim is to encapsulate scientific methods/principles in the most natural way possible. As such they should greatly aid the development of scientific based software. It offers: abstract math interfaces, linear algebra (support for various matrix and vector types), statistics (including probability distributions), wavelets, newtonian mechanics, chart/graph components (AWT and Swing), MathML DOM implementation, ... Note: some packages, like javax.comm, for the astro and instruments package aren't listed as dependencies (not available).

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package JSci.swing;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Point2D;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Iterator;
import java.util.List;
import java.util.ArrayList;
import JSci.awt.*;import JSci.maths.ExtraMath;

/**
* A line trace Swing component.
* @version 1.4
* @author Mark Hale
*/
public final class JLineTrace extends JDoubleBufferedComponent {
        /**
        * Data points.
        */
        private final List dataPoints = new ArrayList();
        /**
        * Sampling interval.
        */
        private float samplingInterval;
        /**
        * Axis numbering.
        */
        private boolean numbering=true;
        private NumberFormat xNumberFormat = new DecimalFormat("##0.0");
        private NumberFormat yNumberFormat = new DecimalFormat("##0.0");
        /**
        * Origin.
        */
        private Point origin=new Point();
        /**
        * Min and max data points.
        */
        private float minX,minY,maxX,maxY;
        /**
        * Axis scaling.
        */
        private float xScale,yScale;
        private final float xIncPixels = 40.0f;
        private final float yIncPixels = 40.0f;
        /**
        * Padding.
        */
        private final int scalePad=5;
        private final int axisPad=25;
        private int leftAxisPad;
        /**
        * Constructs a line trace.
        */
        public JLineTrace(float minx,float maxx,float miny,float maxy) {
                addMouseMotionListener(new MouseLineAdapter());
                setXExtrema(minx,maxx);
                setYExtrema(miny,maxy);
                setSamplingInterval(0.2f);
        }
        /**
        * Gets the data sampled by this line trace.
        */
        public Graph2DModel getModel() {
                final Point2DListModel model=new Point2DListModel();
                model.setData(dataPoints);
                return model;
        }
        /**
        * Turns axis numbering on/off.
        */
        public final void setNumbering(boolean flag) {
                numbering=flag;
                leftAxisPad=axisPad;
                if(numbering && getFont() != null) {
                        // adjust leftAxisPad to accomodate y-axis numbering
                        final FontMetrics metrics = getFontMetrics(getFont());
                        final int maxYNumLen = metrics.stringWidth(yNumberFormat.format(maxY));
                        final int minYNumLen = metrics.stringWidth(yNumberFormat.format(minY));
                        int yNumPad = Math.max(minYNumLen, maxYNumLen);
                        if(minX<0.0f) {
                                final int negXLen = (int)((Math.max(getSize().width,getMinimumSize().width)-2*(axisPad+scalePad))*minX/(minX-maxX));
                                yNumPad = Math.max(yNumPad-negXLen, 0);
                        }
                        leftAxisPad += yNumPad;
                }
        }
        public void addNotify() {
                super.addNotify();
                // getFont() is now not null
                // recalculate padding
                setNumbering(numbering);
        }
        /**
        * Sets the display format used for axis numbering.
        * Convenience method.
        * @see #setXNumberFormat(NumberFormat)
        * @see #setYNumberFormat(NumberFormat)
        */
        public final void setNumberFormat(NumberFormat format) {
                xNumberFormat = format;
                yNumberFormat = format;
                setNumbering(numbering);
        }
        /**
        * Sets the display format used for x-axis numbering.
        */
        public final void setXNumberFormat(NumberFormat format) {
                xNumberFormat = format;
                setNumbering(numbering);
        }
        /**
        * Sets the display format used for y-axis numbering.
        */
        public final void setYNumberFormat(NumberFormat format) {
                yNumberFormat = format;
                setNumbering(numbering);
        }
        /**
        * Sets the minimum/maximum values on the x-axis.
        */
        public void setXExtrema(float min,float max) {
                if(max-->