/*
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*/
package functions;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.StreamTokenizer;
import java.io.Writer;
/**
*
* @author true
*/
public class TabulatedFunctions {
private TabulatedFunctions() {
}
public static TabulatedFunction tabulate(Function function, double leftX, double rightX, int pointsCount) {
if (leftX < function.getLeftDomainBorder() || rightX > function.getRightDomainBorder()) {
throw new IllegalArgumentException("Wrong X domain.");
}
FunctionPoint[] functionPoints = new FunctionPoint[pointsCount];
double delta = (rightX - leftX) / (pointsCount - 1);
for (int i = 0; i < pointsCount; i++) {
functionPoints[i] = new FunctionPoint(leftX + i * delta, function.getFunctionValue(leftX + i * delta));
}
return new ArrayTabulatedFunction(functionPoints);
}
public static void outputTabulatedFunction(TabulatedFunction function, OutputStream out) throws IOException {
DataOutputStream outStream = new DataOutputStream(out);
int pointsCount = function.getPointsCount();
outStream.writeInt(pointsCount);
for (int i = 0; i < pointsCount; i++) {
outStream.writeDouble(function.getPointX(i));
outStream.writeDouble(function.getPointY(i));
}
}
public static TabulatedFunction inputTabulatedFunction(InputStream in) throws IOException {
DataInputStream inStream = new DataInputStream(in);
int pointsCount = inStream.readInt();
FunctionPoint[] points = new FunctionPoint[pointsCount];
for (int i = 0; i < pointsCount; i++) {
points[i] = new FunctionPoint();
points[i].x = inStream.readDouble();
points[i].y = inStream.readDouble();
}
return new ArrayTabulatedFunction(points);
}
public static void writeTabulatedFunction(TabulatedFunction function, Writer out) {
PrintWriter outPrint = new PrintWriter(out);
int pointsCount = function.getPointsCount();
outPrint.println(pointsCount);
for (int i = 0; i < pointsCount; i++) {
outPrint.print(function.getPointX(i));
outPrint.print(' ');
outPrint.println(function.getPointY(i));
}
}
public static TabulatedFunction readTabulatedFunction(Reader in) throws IOException {
StreamTokenizer inTokenizer = new StreamTokenizer(in);
inTokenizer.nextToken();
int pointsCount = (int) inTokenizer.nval;
FunctionPoint[] points = new FunctionPoint[pointsCount];
for (int i = 0; i < pointsCount; i++) {
points[i] = new FunctionPoint();
inTokenizer.nextToken();
points[i].x = inTokenizer.nval;
inTokenizer.nextToken();
points[i].y = inTokenizer.nval;
}
return new ArrayTabulatedFunction(points);
}
}