net.sourceforge.plantuml.svek.image.RotatedEllipse Maven / Gradle / Ivy

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PlantUML is a component that allows to quickly write diagrams from text.

There is a newer version: 1.2024.8

// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
package net.sourceforge.plantuml.svek.image;

import net.sourceforge.plantuml.klimt.geom.XPoint2D;
import net.sourceforge.plantuml.klimt.shape.UEllipse;

public class RotatedEllipse {

	private final UEllipse ellipse;
	private final double beta;

	public RotatedEllipse(UEllipse ellipse, double beta) {
		this.ellipse = ellipse;
		this.beta = beta;
	}

	public double getA() {
		return ellipse.getWidth() / 2;
	}

	public double getB() {
		return ellipse.getHeight() / 2;
	}

	public double getBeta() {
		return beta;
	}

	public XPoint2D getPoint(double theta) {
		final double x = getA() * Math.cos(theta);
		final double y = getB() * Math.sin(theta);

		final double xp = x * Math.cos(beta) - y * Math.sin(beta);
		final double yp = x * Math.sin(beta) + y * Math.cos(beta);

		return new XPoint2D(xp, yp);
	}

	public double getOtherTheta(double theta1) {
		final double z = getPoint(theta1).getX();
		final double a = getA() * Math.cos(beta);
		final double b = getB() * Math.sin(beta);
		final double sum = 2 * a * z / (a * a + b * b);
		final double other = sum - Math.cos(theta1);
		return -Math.acos(other);
	}

	private double other(double[] all, double some) {
		final double diff0 = Math.abs(some - all[0]);
		final double diff1 = Math.abs(some - all[1]);

		if (diff0 > diff1) {
			return all[0];
		}
		return all[1];
	}

}