bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/utils/ShapeStroke.java

   1 /*
   2 Copyright 2006 Jerry Huxtable
   3
   4 Licensed under the Apache License, Version 2.0 (the "License");
   5 you may not use this file except in compliance with the License.
   6 You may obtain a copy of the License at
   7
   8    http://www.apache.org/licenses/LICENSE-2.0
   9
  10 Unless required by applicable law or agreed to in writing, software
  11 distributed under the License is distributed on an "AS IS" BASIS,
  12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 See the License for the specific language governing permissions and
  14 limitations under the License.
  15  */
  16
  17 package org.simantics.scenegraph.utils;
  18
  19 import java.awt.Shape;
  20 import java.awt.Stroke;
  21 import java.awt.geom.AffineTransform;
  22 import java.awt.geom.FlatteningPathIterator;
  23 import java.awt.geom.GeneralPath;
  24 import java.awt.geom.PathIterator;
  25 import java.awt.geom.Rectangle2D;
  26
  27 /**
  28  * Taken from http://www.jhlabs.com/java/java2d/strokes/
  29  */
  30 public class ShapeStroke implements Stroke {
  31     private final Shape shapes[];
  32     private final float advance;
  33     //private final boolean stretchToFit = false;
  34     private final boolean repeat = true;
  35     private final AffineTransform t = new AffineTransform();
  36     private static final float FLATNESS = 1;
  37
  38     public ShapeStroke( Shape shapes, float advance ) {
  39         this( new Shape[] { shapes }, advance );
  40     }
  41
  42     public ShapeStroke( Shape shapes[], float advance ) {
  43         this.advance = advance;
  44         this.shapes = new Shape[shapes.length];
  45
  46         for ( int i = 0; i < this.shapes.length; i++ ) {
  47             Rectangle2D bounds = shapes[i].getBounds2D();
  48             t.setToTranslation( -bounds.getCenterX(), -bounds.getCenterY() );
  49             this.shapes[i] = t.createTransformedShape( shapes[i] );
  50         }
  51     }
  52
  53     @Override
  54     public Shape createStrokedShape( Shape shape ) {
  55         GeneralPath result = new GeneralPath();
  56         PathIterator it = new FlatteningPathIterator( shape.getPathIterator( null ), FLATNESS );
  57         float points[] = new float[6];
  58         float moveX = 0, moveY = 0;
  59         float lastX = 0, lastY = 0;
  60         float thisX = 0, thisY = 0;
  61         int type = 0;
  62         @SuppressWarnings("unused")
  63                 boolean first = false;
  64         float next = 0;
  65         int currentShape = 0;
  66         int length = shapes.length;
  67
  68         //float factor = 1;
  69
  70         while ( currentShape < length && !it.isDone() ) {
  71             type = it.currentSegment( points );
  72             switch( type ){
  73                 case PathIterator.SEG_MOVETO:
  74                     moveX = lastX = points[0];
  75                     moveY = lastY = points[1];
  76                     result.moveTo( moveX, moveY );
  77                     first = true;
  78                     next = 0;
  79                     break;
  80
  81                 case PathIterator.SEG_CLOSE:
  82                     points[0] = moveX;
  83                     points[1] = moveY;
  84                     // Fall into....
  85
  86                 case PathIterator.SEG_LINETO:
  87                     thisX = points[0];
  88                     thisY = points[1];
  89                     float dx = thisX-lastX;
  90                     float dy = thisY-lastY;
  91                     float distance = (float)Math.sqrt( dx*dx + dy*dy );
  92                     if ( distance >= next ) {
  93                         float r = 1.0f/distance;
  94                         float angle = (float)Math.atan2( dy, dx );
  95                         while ( currentShape < length && distance >= next ) {
  96                             float x = lastX + next*dx*r;
  97                             float y = lastY + next*dy*r;
  98                             t.setToTranslation( x, y );
  99                             t.rotate( angle );
 100                             result.append( t.createTransformedShape( shapes[currentShape] ), false );
 101                             next += advance;
 102                             currentShape++;
 103                             if ( repeat )
 104                                 currentShape %= length;
 105                         }
 106                     }
 107                     next -= distance;
 108                     first = false;
 109                     lastX = thisX;
 110                     lastY = thisY;
 111                     break;
 112             }
 113             it.next();
 114         }
 115
 116         return result;
 117     }
 118
 119 }