bundles/org.simantics.graphviz/src/org/simantics/graphviz/internal/xdot/Shapes.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.graphviz.internal.xdot;\r
  13 \r
  14 import java.awt.geom.Ellipse2D;\r
  15 import java.awt.geom.Path2D;\r
  16 \r
  17 public class Shapes {\r
  18         public static Path2D createPolyline(double[] p) {\r
  19                 Path2D path = new Path2D.Double();\r
  20                 path.moveTo(p[0], -p[1]);\r
  21                 for(int i=2;i<p.length;i+=2)\r
  22                         path.lineTo(p[i], -p[i+1]);\r
  23                 return path;\r
  24         }\r
  25         \r
  26         public static Path2D createPolygon(double[] p) {\r
  27                 Path2D path = createPolyline(p);\r
  28                 path.closePath();\r
  29                 return path;\r
  30         }\r
  31         \r
  32         public static Path2D createBSpline(double[] p) {\r
  33                 Path2D.Double path = new Path2D.Double();\r
  34                 path.moveTo(p[0], p[1]);\r
  35                 double cp2x = 0.5 * (p[2] + p[4]);\r
  36                 double cp2y = 0.5 * (p[3] + p[5]);\r
  37                 double newCp1x = (2.0/3.0) * p[4] + (1.0/3.0) * p[6];\r
  38                 double newCp1y = (2.0/3.0) * p[5] + (1.0/3.0) * p[7];\r
  39                 path.curveTo(\r
  40                                 p[2], p[3],\r
  41                                 cp2x, cp2y,\r
  42                                 0.5*(cp2x + newCp1x), 0.5*(cp2y + newCp1y)                              \r
  43                                 );\r
  44                 for(int i=4;i<p.length-8;i+=2) {\r
  45                         double cp1x = newCp1x;\r
  46                         double cp1y = newCp1y;\r
  47                         cp2x = (1.0/3.0) * p[i] + (2.0/3.0) * p[i+2];\r
  48                         cp2y = (1.0/3.0) * p[i+1] + (2.0/3.0) * p[i+3];\r
  49                         newCp1x = (2.0/3.0) * p[i+2] + (1.0/3.0) * p[i+4];\r
  50                         newCp1y = (2.0/3.0) * p[i+3] + (1.0/3.0) * p[i+5];\r
  51                         path.curveTo(\r
  52                                         cp1x, cp1y,\r
  53                                         cp2x, cp2y,\r
  54                                         0.5*(cp2x + newCp1x), 0.5*(cp2y + newCp1y)                              \r
  55                                         );      \r
  56                 }       \r
  57                 {\r
  58                         double cp1x = newCp1x;\r
  59                         double cp1y = newCp1y;\r
  60                         cp2x = (1.0/3.0) * p[p.length-8] + (2.0/3.0) * p[p.length-6];\r
  61                         cp2y = (1.0/3.0) * p[p.length-7] + (2.0/3.0) * p[p.length-5];\r
  62                         newCp1x = 0.5 * (p[p.length-6] + p[p.length-4]);\r
  63                         newCp1y = 0.5 * (p[p.length-5] + p[p.length-3]);\r
  64                         path.curveTo(\r
  65                                         cp1x, cp1y,\r
  66                                         cp2x, cp2y,\r
  67                                         0.5*(cp2x + newCp1x), 0.5*(cp2y + newCp1y)                              \r
  68                                         );\r
  69                         path.curveTo(\r
  70                                         newCp1x, newCp1y,\r
  71                                         p[p.length-4], p[p.length-3],\r
  72                                         p[p.length-2], p[p.length-1]                            \r
  73                                         );\r
  74                 }\r
  75                 return path;\r
  76         }\r
  77         \r
  78         public static Path2D createCubicSegments(double[] p) {\r
  79                 Path2D.Double path = new Path2D.Double();\r
  80                 path.moveTo(p[0], -p[1]);\r
  81                 for(int i=2;i<p.length;i+=6) {\r
  82                         path.curveTo(p[i],-p[i+1],p[i+2],-p[i+3],p[i+4],-p[i+5]);\r
  83                 }\r
  84                 return path;\r
  85         }\r
  86         \r
  87         public static Ellipse2D createEllipse(double x, double y, double w, double h) {\r
  88                 return new Ellipse2D.Double(x-w, -y-h, w*2.0, h*2.0);\r
  89         }\r
  90 }\r