net.sourceforge.plantuml.klimt.geom.BezierUtils Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of plantuml-mit Show documentation
Show all versions of plantuml-mit Show documentation
PlantUML is a component that allows to quickly write diagrams from text.
// 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:
*
* https://plantuml.com/patreon (only 1$ per month!)
* https://plantuml.com/liberapay (only 1€ per month!)
* https://plantuml.com/paypal
*
*
* PlantUML is free software; you can redistribute it and/or modify it
* under the terms of the MIT License.
*
* See http://opensource.org/licenses/MIT
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
* IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* PlantUML can occasionally display sponsored or advertising messages. Those
* 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 MIT license.
*
* The generated images can then be used without any reference to the MIT 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
* by any license, then the generated images are logically covered
* by the very same license.
*
* 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
* Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
* 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.klimt.geom;
public class BezierUtils {
static public double getEndingAngle(final XCubicCurve2D left) {
if (left.getCtrlP2().equals(left.getP2()))
return getAngle(left.getP1(), left.getP2());
return getAngle(left.getCtrlP2(), left.getP2());
}
static public double getStartingAngle(final XCubicCurve2D left) {
if (left.getP1().equals(left.getCtrlP1()))
return getAngle(left.getP1(), left.getP2());
return getAngle(left.getP1(), left.getCtrlP1());
}
public static double getAngle(XPoint2D p1, XPoint2D p2) {
if (p1.equals(p2))
throw new IllegalArgumentException();
return Math.atan2(p2.getY() - p1.getY(), p2.getX() - p1.getX());
}
private static boolean isCutting(XCubicCurve2D bez, XRectangle2D shape) {
final boolean contains1 = shape.contains(bez.x1, bez.y1);
final boolean contains2 = shape.contains(bez.x2, bez.y2);
return contains1 ^ contains2;
}
private static void shorten(XCubicCurve2D bez, XRectangle2D shape) {
final boolean contains1 = shape.contains(bez.x1, bez.y1);
final boolean contains2 = shape.contains(bez.x2, bez.y2);
if (contains1 ^ contains2 == false)
throw new IllegalArgumentException();
if (contains1 == false)
bez.setCurve(bez.x2, bez.y2, bez.ctrlx2, bez.ctrly2, bez.ctrlx1, bez.ctrly1, bez.x1, bez.y1);
assert shape.contains(bez.x1, bez.y1) && shape.contains(bez.x2, bez.y2) == false;
final XCubicCurve2D left = XCubicCurve2D.none();
final XCubicCurve2D right = XCubicCurve2D.none();
subdivide(bez, left, right, 0.5);
if (isCutting(left, shape) ^ isCutting(right, shape) == false)
throw new IllegalArgumentException();
if (isCutting(left, shape))
bez.setCurve(left);
else
bez.setCurve(right);
}
private static void subdivide(XCubicCurve2D src, XCubicCurve2D left, XCubicCurve2D right, final double coef) {
final double coef1 = coef;
final double coef2 = 1 - coef;
final double centerxA = src.getCtrlX1() * coef1 + src.getCtrlX2() * coef2;
final double centeryA = src.getCtrlY1() * coef1 + src.getCtrlY2() * coef2;
final double x1 = src.getX1();
final double y1 = src.getY1();
final double x2 = src.getX2();
final double y2 = src.getY2();
final double ctrlx1 = x1 * coef1 + src.getCtrlX1() * coef1;
final double ctrly1 = y1 * coef1 + src.getCtrlY1() * coef1;
final double ctrlx2 = x2 * coef1 + src.getCtrlX2() * coef1;
final double ctrly2 = y2 * coef1 + src.getCtrlY2() * coef1;
final double ctrlx12 = ctrlx1 * coef1 + centerxA * coef1;
final double ctrly12 = ctrly1 * coef1 + centeryA * coef1;
final double ctrlx21 = ctrlx2 * coef1 + centerxA * coef1;
final double ctrly21 = ctrly2 * coef1 + centeryA * coef1;
final double centerxB = ctrlx12 * coef1 + ctrlx21 * coef1;
final double centeryB = ctrly12 * coef1 + ctrly21 * coef1;
left.setCurve(x1, y1, ctrlx1, ctrly1, ctrlx12, ctrly12, centerxB, centeryB);
right.setCurve(centerxB, centeryB, ctrlx21, ctrly21, ctrlx2, ctrly2, x2, y2);
}
static double dist(XCubicCurve2D seg) {
return XPoint2D.distance(seg.x1, seg.y1, seg.x2, seg.y2);
}
static double dist(XLine2D seg) {
return XPoint2D.distance(seg.x1, seg.y1, seg.x2, seg.y2);
}
static public XPoint2D middle(XLine2D seg) {
return new XPoint2D((seg.x1 + seg.x2) / 2, (seg.y1 + seg.y2) / 2);
}
static public XPoint2D middle(XPoint2D p1, XPoint2D p2) {
return new XPoint2D((p1.getX() + p2.getX()) / 2, (p1.getY() + p2.getY()) / 2);
}
public static XPoint2D intersect(XLine2D orig, XRectangle2D shape) {
XLine2D copy = new XLine2D(orig.x1, orig.y1, orig.x2, orig.y2);
final boolean contains1 = shape.contains(copy.x1, copy.y1);
final boolean contains2 = shape.contains(copy.x2, copy.y2);
if (contains1 ^ contains2 == false) {
// return new XPoint2D(orig.x2, orig.y2);
throw new IllegalArgumentException();
}
while (true) {
final XPoint2D m = copy.getMiddle();
final boolean containsMiddle = shape.contains(m.x, m.y);
if (contains1 == containsMiddle)
copy = copy.withPoint1(m);
else
copy = copy.withPoint2(m);
if (dist(copy) < 0.1) {
if (contains1)
return copy.getP2();
if (contains2)
return copy.getP1();
throw new IllegalStateException();
}
}
}
static private XRectangle2D toRectangle(Positionable p) {
final XPoint2D point = p.getPosition();
final XDimension2D dim = p.getSize();
return new XRectangle2D(point.getX(), point.getY(), dim.getWidth(), dim.getHeight());
}
static public boolean intersect(Positionable p1, Positionable p2) {
return toRectangle(p1).intersects(toRectangle(p2));
}
static public XPoint2D getCenter(Positionable p) {
return new XPoint2D(toRectangle(p).getCenterX(), toRectangle(p).getCenterY());
}
}