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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/awt/java2d/Segment.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/awt/java2d/Segment.java')
-rw-r--r-- | libjava/classpath/gnu/java/awt/java2d/Segment.java | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/awt/java2d/Segment.java b/libjava/classpath/gnu/java/awt/java2d/Segment.java new file mode 100644 index 000000000..1d9a57001 --- /dev/null +++ b/libjava/classpath/gnu/java/awt/java2d/Segment.java @@ -0,0 +1,158 @@ +/* Segment.java -- Abstract segment used for BasicStroke + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath 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, or (at your option) +any later version. + +GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.awt.java2d; + +import java.awt.geom.Point2D; + +public abstract class Segment implements Cloneable +{ + // Start and end points of THIS segment + public Point2D P1; + public Point2D P2; + + // Segments can be linked together internally as a linked list + public Segment first; + public Segment next; + public Segment last; + + // Half the stroke width + protected double radius; + + /** + * Create a new, empty segment + */ + public Segment() + { + P1 = P2 = null; + first = this; + next = null; + last = this; + } + + /** + * Add a segment to the polygon + * @param newsegment segment to add + */ + public void add(Segment newsegment) + { + newsegment.first = first; + last.next = newsegment; + last = last.next.last; + } + + /** + * Reverses the orientation of the whole polygon + */ + public void reverseAll() + { + reverse(); + first = last; + Segment v = next; + Segment former = this; + next = null; + + while (v != null) + { + v.reverse(); + v.last = this; + Segment oldnext = v.next; + v.next = former; + + former = v; + v = oldnext; // move to the next in list + } + } + + public String toString() + { + return "Segment:"+P1+", "+P2; + } + + /** + * Get the normal vector to the slope of the line. + * @return vector of length radius, normal to the (x0,y0)-(x1,y1) vector) + */ + protected double[] normal(double x0, double y0, double x1, double y1) + { + double dx = (x1 - x0); + double dy = (y1 - y0); + if( dy == 0 ) + { + dy = radius * ((dx > 0)?1:-1); + dx = 0; + } + else if( dx == 0 ) + { + dx = radius * ((dy > 0)?-1:1); + dy = 0; + } + else + { + double N = Math.sqrt(dx * dx + dy * dy); + double odx = dx; + dx = -radius * dy / N; + dy = radius * odx / N; + } + return new double[]{ dx, dy }; + } + + /** + * Reverse the current segment + */ + public abstract void reverse(); + + /** + * Get the "top" and "bottom" segments of a segment. + * First array element is p0 + normal, second is p0 - normal. + */ + public abstract Segment[] getDisplacedSegments(double radius); + + /** + * Returns the coordinates of the first control point, or the start point + * for a line segment. + */ + public abstract double[] cp1(); + + /** + * Returns the coordinates of the second control point, or the end point + * for a line segment. + */ + public abstract double[] cp2(); + +} |