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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 GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* PlantUML distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see contactPoints = new HashSet<>();
for (Link link : sametailLinks) {
final SvekEdge line = bibliotekon.getLine(link);
final XPoint2D contact = line.getStartContactPoint();
contactPoints.add(contact);
}
final XRectangle2D rect = new XRectangle2D(minX, minY, shapeDim.getWidth(), shapeDim.getHeight());
final XPoint2D center = new XPoint2D(rect.getCenterX(), rect.getCenterY());
for (XPoint2D pt : contactPoints) {
final XPoint2D inter = intersection(rect, center, pt);
if (inter == null) {
// System.err.println("rect=" + rect);
// System.err.println("center=" + center);
// System.err.println("pt=" + pt);
assert false;
continue;
}
final double theta = Math.atan2(center.getX() - pt.getX(), -(center.getY() - pt.getY()));
final XPoint2D middle = drawExtends(ug, inter, theta);
drawLine(ug, middle, pt);
}
for (Link link : allButSametails) {
final SvekEdge line = bibliotekon.getLine(link);
final XPoint2D contact = link.getEntity1() == leaf ? line.getStartContactPoint()
: line.getEndContactPoint();
if (contact == null) {
// assert false;
continue;
}
final XPoint2D inter = intersection(rect, center, contact);
if (inter == null) {
// assert false;
continue;
}
drawLine(ug, inter, contact);
}
}
private XPoint2D drawExtends(UGraphic ug, XPoint2D contact, double theta) {
final UPolygon poly = new UPolygon();
poly.addPoint(0, 0);
poly.addPoint(7, 20);
poly.addPoint(-7, 20);
poly.rotate(theta);
final UTranslate translate = UTranslate.point(contact);
ug.apply(translate).draw(poly);
final XPoint2D p1 = translate.getTranslated(poly.getPoints().get(1));
final XPoint2D p2 = translate.getTranslated(poly.getPoints().get(2));
return new XPoint2D((p1.getX() + p2.getX()) / 2, (p1.getY() + p2.getY()) / 2);
}
static XPoint2D intersection(XRectangle2D rect, XPoint2D pt1, XPoint2D pt2) {
XPoint2D p;
p = intersection(new XPoint2D(rect.getMinX(), rect.getMinY()), new XPoint2D(rect.getMaxX(), rect.getMinY()),
pt1, pt2);
if (p != null)
return p;
p = intersection(new XPoint2D(rect.getMinX(), rect.getMaxY()), new XPoint2D(rect.getMaxX(), rect.getMaxY()),
pt1, pt2);
if (p != null)
return p;
p = intersection(new XPoint2D(rect.getMinX(), rect.getMinY()), new XPoint2D(rect.getMinX(), rect.getMaxY()),
pt1, pt2);
if (p != null)
return p;
p = intersection(new XPoint2D(rect.getMaxX(), rect.getMinY()), new XPoint2D(rect.getMaxX(), rect.getMaxY()),
pt1, pt2);
if (p != null)
return p;
return null;
}
static private XPoint2D intersection(XPoint2D pt1, XPoint2D pt2, XPoint2D pt3, XPoint2D pt4) {
// System.err.println("Checking intersection of " + pt1 + "-" + pt2 + " and " +
// pt3 + "-" + pt4);
return intersection(pt1.getX(), pt1.getY(), pt2.getX(), pt2.getY(), pt3.getX(), pt3.getY(), pt4.getX(),
pt4.getY());
}
private static final double epsilon = .001;
static private XPoint2D intersection(double x1, double y1, double x2, double y2, double x3, double y3, double x4,
double y4) {
final double d = (x1 - x2) * (y3 - y4) - (y1 - y2) * (x3 - x4);
if (d == 0)
return null;
final double xi = ((x3 - x4) * (x1 * y2 - y1 * x2) - (x1 - x2) * (x3 * y4 - y3 * x4)) / d;
final double yi = ((y3 - y4) * (x1 * y2 - y1 * x2) - (y1 - y2) * (x3 * y4 - y3 * x4)) / d;
final XPoint2D p = new XPoint2D(xi, yi);
if (xi + epsilon < Math.min(x1, x2) || xi - epsilon > Math.max(x1, x2))
return null;
if (xi + epsilon < Math.min(x3, x4) || xi - epsilon > Math.max(x3, x4))
return null;
if (yi + epsilon < Math.min(y1, y2) || yi - epsilon > Math.max(y1, y2))
return null;
if (yi + epsilon < Math.min(y3, y4) || yi - epsilon > Math.max(y3, y4))
return null;
return p;
}
private void drawLine(UGraphic ug, XPoint2D pt1, XPoint2D pt2) {
drawLine(ug, pt1.getX(), pt1.getY(), pt2.getX(), pt2.getY());
}
private void drawLine(UGraphic ug, double x1, double y1, double x2, double y2) {
final ULine line = new ULine(x2 - x1, y2 - y1);
ug.apply(new UTranslate(x1, y1)).draw(line);
}
}