What follows is the highlighted source code with comments. You can also download this file directly: PathDrawing.java.

/* * Copyright (C) 2012 W. Patrick Hooper <wphooper@gmail.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ package graphics; import geometry.LineSegment; import java.awt.Graphics2D; import java.awt.geom.AffineTransform; import java.awt.geom.Line2D; import path.EdgeIterator; import path.PolygonalPath; /** * This class contains a static method for drawing a polygonal path. * * @author W. Patrick Hooper <wphooper@gmail.com> */ public class PathDrawing { /** * Draw the image of the polygonal path p under the affine transform t. */ public static void drawPolygonalPath(Graphics2D g, AffineTransform t, PolygonalPath p) { // We now iterate over the segments in the path. EdgeIterator it = p.iterator(); while (it.hasNext()) { LineSegment s = it.next(); // Constuct a Line2D with the same start and end points. // The advantage of this object is that it can be drawn. Line2D line_segment = new Line2D.Double(s.startingPoint().re(), s.startingPoint().im(), s.endingPoint().re(), s.endingPoint().im()); // Convert the line segment into screen coordinates, then draw it. g.draw(t.createTransformedShape(line_segment)); } } }

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