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PlantUML is a component that allows to quickly write diagrams from text.
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// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
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 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the Apache Software License.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
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 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this APACHE license.
 *
 * The generated images can then be used without any reference to the APACHE license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
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 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
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 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.jsondiagram;

import java.util.ArrayList;
import java.util.List;

import h.ST_Agedgeinfo_t;
import h.ST_bezier;
import h.ST_pointf;
import h.ST_splines;
import net.sourceforge.plantuml.klimt.UPath;
import net.sourceforge.plantuml.klimt.UStroke;
import net.sourceforge.plantuml.klimt.UTranslate;
import net.sourceforge.plantuml.klimt.color.HColor;
import net.sourceforge.plantuml.klimt.drawing.UGraphic;
import net.sourceforge.plantuml.klimt.geom.XPoint2D;
import net.sourceforge.plantuml.klimt.shape.UEllipse;

public class JsonCurve {

	private final List points = new ArrayList<>();
	private double maxX, maxY;
	private final Mirror xMirror;
	private final double veryFirstLine;

	private final XPoint2D sp;
	private final XPoint2D ep;

	public JsonCurve(ST_Agedgeinfo_t data, Mirror xMirror, double veryFirstLine) {
		this.veryFirstLine = veryFirstLine;
		this.xMirror = xMirror;
		final ST_splines splines = data.spl;
		if (splines.size != 1) {
			throw new IllegalStateException();
		}
		final ST_bezier beziers = splines.list.get__(0);
		for (int i = 0; i < beziers.size; i++) {
			final XPoint2D pt = getPoint(splines, i);
			maxX = Math.max(maxX, pt.getX());
			maxY = Math.max(maxY, pt.getY());
			points.add(pt);
		}

		if (beziers.sp.x == 0 && beziers.sp.y == 0) {
			sp = null;
		} else {
			sp = new XPoint2D(beziers.sp.x, beziers.sp.y);
		}
		if (beziers.ep.x == 0 && beziers.ep.y == 0) {
			ep = null;
		} else {
			ep = new XPoint2D(beziers.ep.x, beziers.ep.y);
		}

	}

	private XPoint2D getPoint(ST_splines splines, int i) {
		final ST_bezier beziers = splines.list.get__(0);
		final ST_pointf pt = beziers.list.get__(i);
		return new XPoint2D(pt.x, pt.y);
	}

	public void drawCurve(HColor color, UGraphic ug) {
		final UPath path = UPath.none();

		path.moveTo(getVeryFirst());
		path.lineTo(xMirror.invAndXYSwitch(points.get(0)));

		for (int i = 1; i < points.size(); i += 3) {
			final XPoint2D pt2 = xMirror.invAndXYSwitch(points.get(i));
			final XPoint2D pt3 = xMirror.invAndXYSwitch(points.get(i + 1));
			final XPoint2D pt4 = xMirror.invAndXYSwitch(points.get(i + 2));
			path.cubicTo(pt2, pt3, pt4);
		}
		ug.draw(path);

		if (ep != null) {
			final XPoint2D last = xMirror.invAndXYSwitch(points.get(points.size() - 1));
			final XPoint2D trueEp = xMirror.invAndXYSwitch(ep);
			new Arrow(last, trueEp).drawArrow(ug.apply(color.bg()));
		}
	}

	public void drawSpot(UGraphic ug) {
		final double size = 3;
		ug = ug.apply(UTranslate.point(getVeryFirst()).compose(new UTranslate(-size, -size)));
		ug.apply(UStroke.simple()).draw(UEllipse.build(2 * size, 2 * size));
	}

	private XPoint2D getVeryFirst() {
		return supp(xMirror.invAndXYSwitch(points.get(0)), xMirror.invAndXYSwitch(points.get(1)), veryFirstLine);

	}

	private static XPoint2D supp(XPoint2D center, XPoint2D direction, double len) {
		final double full = center.distance(direction);
		final double dx = (center.getX() - direction.getX()) / full;
		final double dy = (center.getY() - direction.getY()) / full;

		return new XPoint2D(center.getX() + dx * len, center.getY() + dy * len);

	}

	public double getMaxX() {
		return maxX;
	}

	public double getMaxY() {
		return maxY;
	}

}