Airfoil.java

package uk.co.flyingsquirrels.aero;

import flanagan.interpolation.CubicSpline;

/**
 * Interpolates data from an AirfoilTable
 */
public class Airfoil {

	private final CubicSpline cl;
	private final CubicSpline cd;
	private final CubicSpline cm;
	private final AirfoilTable table;

	public Airfoil(AirfoilTable table) {
		this.table = table;
		double[] alpha = table.getAlpha();
		cl = createSpline(alpha, table.getCl());
		cd = createSpline(alpha, table.getCd());
		cm = createSpline(alpha, table.getCm());
	}

	private CubicSpline createSpline(double[] alpha, double[] cy) {
		CubicSpline spline = new CubicSpline(alpha, cy);
		spline.calcDeriv();
		return spline;
	}

	public double getCl(double alpha) {
		return cl.interpolate(alpha);
	}

	public double getCd(double alpha) {
		return cd.interpolate(alpha);
	}

	public double getCm(double alpha) {
		return cm.interpolate(alpha);
	}

	public String getName() {
		return table.getName();
	}
	
	public long getReynolds() {
		return table.getReynolds();
	}
}