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

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