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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.awt;
import java.awt.*;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import JSci.maths.ExtraMath;
/**
* A histogram AWT component.
* The y-values are the counts for each bin.
* Each bin is specified by an interval.
* So that y[i] contains the counts for the bin from x[i-1] to x[i].
* The value of y[0] is disregarded.
* @version 1.0
* @author Mark Hale
*/
public class Histogram extends DoubleBufferedCanvas implements GraphDataListener {
/**
* Data model.
*/
protected Graph2DModel model;
/**
* Origin.
*/
protected Point origin = new Point();
/**
* Series colors.
*/
protected Color seriesColor[]={Color.blue,Color.green,Color.red,Color.yellow,Color.cyan,Color.lightGray,Color.magenta,Color.orange,Color.pink};
/**
* Axis numbering.
*/
protected boolean numbering = true;
protected NumberFormat xNumberFormat = new DecimalFormat("##0.0");
protected NumberFormat yNumberFormat = new DecimalFormat("##0.0");
protected boolean gridLines = false;
private final Color gridLineColor = Color.lightGray;
/**
* Axis scaling.
*/
private float xScale,yScale;
/**
* Axis extrema.
*/
private float minX, minY, maxX, maxY;
private boolean autoXExtrema=true, autoYExtrema=true;
private float xGrowth, yGrowth;
/**
* Axis numbering increment.
*/
private final float xIncPixels = 40.0f;
private final float yIncPixels = 40.0f;
private float xInc,yInc;
private boolean autoXInc=true,autoYInc=true;
/**
* Padding.
*/
protected final int scalePad=5;
protected final int axisPad=25;
protected int leftAxisPad;
/**
* Constructs a histogram.
*/
public Histogram(Graph2DModel gm) {
model=gm;
model.addGraphDataListener(this);
dataChanged(new GraphDataEvent(model));
}
/**
* Sets the data plotted by this graph to the specified data.
*/
public final void setModel(Graph2DModel gm) {
model.removeGraphDataListener(this);
model=gm;
model.addGraphDataListener(this);
dataChanged(new GraphDataEvent(model));
}
/**
* Returns the model used by this graph.
*/
public final Graph2DModel getModel() {
return model;
}
/**
* Implementation of GraphDataListener.
* Application code will not use this method explicitly, it is used internally.
*/
public void dataChanged(GraphDataEvent e) {
if(e.isIncremental()) {
Graphics g = getOffscreenGraphics();
if(g == null)
return;
final int series = e.getSeries();
if(series == GraphDataEvent.ALL_SERIES) {
model.firstSeries();
int n = 0;
do {
final int i = model.seriesLength() - 1;
incrementalRescale(model.getXCoord(i), model.getYCoord(i));
g.setColor(seriesColor[n]);
drawDataPoint(g, i);
n++;
} while(model.nextSeries());
} else {
model.firstSeries();
int n=0;
for(; nseriesColor.length) {
Color tmp[]=seriesColor;
seriesColor=new Color[n];
System.arraycopy(tmp,0,seriesColor,0,tmp.length);
for(int i=tmp.length; i maxX)
max = autoXExtrema ? Math.max(x, maxX+xGrowth) : maxX+xGrowth;
else
max = maxX;
rescaleX(min, max);
if(y < minY)
min = autoYExtrema ? Math.min(y, minY-yGrowth) : minY-yGrowth;
else
min = minY;
if(y > maxY)
max = autoYExtrema ? Math.max(y, maxY+yGrowth) : maxY+yGrowth;
else
max = maxY;
rescaleY(min, max);
}
/**
* Turns axis numbering on/off.
* Default is on.
*/
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;
}
rescale();
}
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);
}
/**
* Turns grid lines on/off.
* Default is off.
*/
public final void setGridLines(boolean flag) {
gridLines = flag;
redraw();
}
/**
* Sets the x-axis numbering increment.
* @param dx use 0.0f for auto-adjusting (default).
*/
public final void setXIncrement(float dx) {
if(dx < 0.0f) {
throw new IllegalArgumentException("Increment should be positive.");
} else if(dx == 0.0f) {
if(!autoXInc) {
autoXInc = true;
rescale();
}
} else {
autoXInc = false;
if(dx != xInc) {
xInc = dx;
rescale();
}
}
}
/**
* Returns the x-axis numbering increment.
*/
public final float getXIncrement() {
return xInc;
}
/**
* Sets the y-axis numbering increment.
* @param dy use 0.0f for auto-adjusting (default).
*/
public final void setYIncrement(float dy) {
if(dy < 0.0f) {
throw new IllegalArgumentException("Increment should be positive.");
} else if(dy == 0.0f) {
if(!autoYInc) {
autoYInc = true;
rescale();
}
} else {
autoYInc = false;
if(dy != yInc) {
yInc = dy;
rescale();
}
}
}
/**
* Returns the y-axis numbering increment.
*/
public final float getYIncrement() {
return yInc;
}
/**
* Sets the minimum/maximum values on the x-axis.
* Set both min and max to 0.0f for auto-adjusting (default).
*/
public final void setXExtrema(float min, float max) {
if(min==0.0f && max==0.0f) {
autoXExtrema=true;
// determine min and max from model
min=Float.POSITIVE_INFINITY;
max=Float.NEGATIVE_INFINITY;
float tmp;
model.firstSeries();
do {
for(int i=0;i-->