bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/g2d/nodes/connection/HighlightActionPointsAction.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2011 Association for Decentralized Information Management in\r
   3  * 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.scenegraph.g2d.nodes.connection;\r
  13 \r
  14 import java.awt.AlphaComposite;\r
  15 import java.awt.BasicStroke;\r
  16 import java.awt.Composite;\r
  17 import java.awt.Graphics2D;\r
  18 import java.awt.Stroke;\r
  19 import java.awt.geom.AffineTransform;\r
  20 import java.awt.geom.Rectangle2D;\r
  21 import java.awt.image.BufferedImage;\r
  22 import java.io.IOException;\r
  23 import java.net.URL;\r
  24 import java.util.ArrayList;\r
  25 import java.util.Collection;\r
  26 \r
  27 import javax.imageio.ImageIO;\r
  28 \r
  29 import org.simantics.diagram.connection.RouteGraph;\r
  30 import org.simantics.diagram.connection.RouteLineHalf;\r
  31 import org.simantics.diagram.connection.actions.IAction;\r
  32 import org.simantics.diagram.connection.rendering.IRouteGraphRenderer;\r
  33 \r
  34 /**\r
  35  * @author Tuukka Lehtonen\r
  36  */\r
  37 public class HighlightActionPointsAction implements IAction {\r
  38 \r
  39     public static enum Action {\r
  40         REMOVE,\r
  41         RECONNECT\r
  42     }\r
  43 \r
  44     public static class Pick {\r
  45         public static final Pick MISS = new Pick(null, null);\r
  46 \r
  47         Action                   action;\r
  48         RouteLineHalf            line;\r
  49 \r
  50         public Pick(Action action, RouteLineHalf line) {\r
  51             this.action = action;\r
  52             this.line = line;\r
  53         }\r
  54 \r
  55         public boolean hasAction(Action action) {\r
  56             return this.action == action;\r
  57         }\r
  58 \r
  59         public boolean hasResult() {\r
  60             return action != null && line != null;\r
  61         }\r
  62 \r
  63         public boolean matches(Action action, RouteLineHalf line) {\r
  64             if (this.action == null || this.line == null)\r
  65                 return false;\r
  66             return this.action.equals(action) && this.line.equals(line);\r
  67         }\r
  68     }\r
  69 \r
  70     static BufferedImage                cross;\r
  71     static BufferedImage                cut;\r
  72 \r
  73     static {\r
  74         cross = safeReadImage("cross.png");\r
  75         cut = safeReadImage("cut.png");\r
  76     }\r
  77 \r
  78     public static final Stroke          STROKE                  = new BasicStroke(0.1f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);\r
  79     public static final AlphaComposite  COMPOSITE               = AlphaComposite.SrcOver.derive(0.6f);\r
  80 \r
  81     public static final double          DEGENERATED_LINE_LENGTH = 1;\r
  82     public static final double          CUT_DIST_FROM_END       = 0.5;\r
  83 \r
  84     RouteGraph                          rg;\r
  85 \r
  86     transient Collection<RouteLineHalf> lhs                     = new ArrayList<RouteLineHalf>();\r
  87     transient AffineTransform           transform               = new AffineTransform();\r
  88     transient AffineTransform           transform2              = new AffineTransform();\r
  89     transient Rectangle2D               rect                    = new Rectangle2D.Double();\r
  90 \r
  91     public HighlightActionPointsAction(RouteGraph rg) {\r
  92         this.rg = rg;\r
  93     }\r
  94 \r
  95     public void setRouteGraph(RouteGraph rg) {\r
  96         this.rg = rg;\r
  97     }\r
  98 \r
  99     @Override\r
 100     public void render(Graphics2D g, IRouteGraphRenderer renderer, double mouseX, double mouseY) {\r
 101         // Cannot perform cut or delete segment actions on connections between 2\r
 102         // terminals.\r
 103         boolean simpleConnection = (rg.isSimpleConnection() || rg.getTerminals().size() <= 2);\r
 104         boolean branchedConnection = rg.getTerminals().size() > 2;\r
 105 \r
 106         lhs.clear();\r
 107         rg.getLineHalves(lhs);\r
 108 \r
 109         AffineTransform preTr = g.getTransform();\r
 110         double viewScale = 1.0 / getScale(preTr);\r
 111         transform2.setToScale(viewScale, viewScale);\r
 112         Composite originalComposite = g.getComposite();\r
 113         g.setComposite(COMPOSITE);\r
 114 \r
 115         Pick pick = pickAction(rg, lhs, preTr, mouseX, mouseY);\r
 116 \r
 117         if (!simpleConnection) {\r
 118             double crossW = cross.getWidth()*viewScale*.5;\r
 119             double crossH = cross.getHeight()*viewScale*.5;\r
 120 \r
 121             // Render line removal markers\r
 122             for (RouteLineHalf lh : lhs) {\r
 123 //                if (lh.getLine().getLength() < DEGENERATED_LINE_LENGTH)\r
 124 //                    continue;\r
 125 //                if (!lh.getLine().isTransient())\r
 126 //                    continue;\r
 127                 if (lh.getLine().getTerminal() == null)\r
 128                     continue;\r
 129                 double x = lh.getLink().getX();\r
 130                 double y = lh.getLink().getY();\r
 131                 if (lh.getLine().isHorizontal()) {\r
 132                     x = (lh.getLine().getBegin().getX() + lh.getLine().getEnd().getX()) * .5;\r
 133                 } else {\r
 134                     y = (lh.getLine().getBegin().getY() + lh.getLine().getEnd().getY()) * .5;\r
 135                 }\r
 136 \r
 137                 boolean hit = pick.matches(Action.REMOVE, lh);\r
 138 \r
 139                 if (hit)\r
 140                     g.setComposite(originalComposite);\r
 141                 transform.setToTranslation(x-crossW, y-crossH);\r
 142                 g.transform(transform);\r
 143                 g.drawImage(cross, transform2, null);\r
 144                 g.setTransform(preTr);\r
 145                 if (hit)\r
 146                     g.setComposite(COMPOSITE);\r
 147             }\r
 148         }\r
 149 \r
 150         // Render reconnection markers if the connection is branched.\r
 151         if (branchedConnection) {\r
 152             double cutW = cut.getWidth()*viewScale*.5;\r
 153             double cutH = cut.getHeight()*viewScale*.5;\r
 154 \r
 155             final double dist = CUT_DIST_FROM_END;\r
 156             for (RouteLineHalf lh : lhs) {\r
 157                 if (lh.getLine().getLength() < DEGENERATED_LINE_LENGTH*3)\r
 158                     continue;\r
 159                 double x = lh.getLink().getX();\r
 160                 double y = lh.getLink().getY();\r
 161                 if (lh.getLine().isHorizontal()) {\r
 162                     if (lh.getLink() == lh.getLine().getBegin())\r
 163                         x += dist*2;\r
 164                     else\r
 165                         x -= dist*2;\r
 166                 } else {\r
 167                     if (lh.getLink() == lh.getLine().getBegin())\r
 168                         y += dist*2;\r
 169                     else\r
 170                         y -= dist*2;\r
 171                 }\r
 172 \r
 173                 boolean hit = pick.matches(Action.RECONNECT, lh);\r
 174 \r
 175                 if (hit)\r
 176                     g.setComposite(originalComposite);\r
 177                 transform.setToTranslation(x-cutW, y-cutH);\r
 178                 if (!lh.getLine().isHorizontal()) {\r
 179                     transform.rotate(Math.PI/2, cutW, cutH);\r
 180                 }\r
 181                 g.transform(transform);\r
 182                 g.drawImage(cut, transform2, null);\r
 183                 g.setTransform(preTr);\r
 184                 if (hit)\r
 185                     g.setComposite(COMPOSITE);\r
 186             }\r
 187         }\r
 188 \r
 189         g.setComposite(originalComposite);\r
 190     }\r
 191 \r
 192     public Pick pickAction(RouteGraph rg, AffineTransform viewTr, double mouseX, double mouseY) {\r
 193         boolean branchedConnection = rg.getTerminals().size() > 2;\r
 194         boolean simpleConnection = (rg.isSimpleConnection() || rg.getTerminals().size() <= 2);\r
 195         if (!branchedConnection || simpleConnection)\r
 196             return null;\r
 197 \r
 198         lhs.clear();\r
 199         return pickAction(rg, rg.getLineHalves(lhs), viewTr, mouseX, mouseY);\r
 200     }\r
 201 \r
 202     public Pick pickAction(RouteGraph rg, Collection<RouteLineHalf> lhs, AffineTransform viewTr, double mouseX, double mouseY) {\r
 203         boolean branchedConnection = rg.getTerminals().size() > 2;\r
 204         boolean simpleConnection = (rg.isSimpleConnection() || rg.getTerminals().size() <= 2);\r
 205         if (!branchedConnection || simpleConnection || viewTr == null)\r
 206             return Pick.MISS;\r
 207 \r
 208         lhs.clear();\r
 209         rg.getLineHalves(lhs);\r
 210 \r
 211         RouteLineHalf selected = null;\r
 212         Action selectedAction = null;\r
 213         double nearest = Double.MAX_VALUE;\r
 214         double viewScale = 1.0 / getScale(viewTr);\r
 215 \r
 216         if (!simpleConnection) {\r
 217             double crossW = cross.getWidth()*viewScale*.5;\r
 218             double crossH = cross.getHeight()*viewScale*.5;\r
 219 \r
 220             // Render line removal markers\r
 221             for (RouteLineHalf lh : lhs) {\r
 222 //                if (lh.getLine().getLength() < DEGENERATED_LINE_LENGTH)\r
 223 //                    continue;\r
 224 //                if (!lh.getLine().isTransient())\r
 225 //                    continue;\r
 226                 if (lh.getLine().getTerminal() == null)\r
 227                     continue;\r
 228                 double x = lh.getLink().getX();\r
 229                 double y = lh.getLink().getY();\r
 230                 if (lh.getLine().isHorizontal()) {\r
 231                     x = (lh.getLine().getBegin().getX() + lh.getLine().getEnd().getX()) * .5;\r
 232                 } else {\r
 233                     y = (lh.getLine().getBegin().getY() + lh.getLine().getEnd().getY()) * .5;\r
 234                 }\r
 235 \r
 236                 rect.setFrameFromCenter(x, y, x-crossW, y-crossH);\r
 237                 boolean hit = rect.contains(mouseX, mouseY);\r
 238                 if (hit) {\r
 239                     double distSq = distSq(x, y, mouseX, mouseY);\r
 240                     if (distSq < nearest) {\r
 241                         nearest = distSq;\r
 242                         selected = lh;\r
 243                         selectedAction = Action.REMOVE;\r
 244                     }\r
 245                 }\r
 246             }\r
 247         }\r
 248 \r
 249         // Render reconnection markers if the connection is branched.\r
 250         if (branchedConnection) {\r
 251             double cutW = cut.getWidth()*viewScale*.5;\r
 252             double cutH = cut.getHeight()*viewScale*.5;\r
 253 \r
 254             final double dist = CUT_DIST_FROM_END;\r
 255             for (RouteLineHalf lh : lhs) {\r
 256                 if (lh.getLine().getLength() < DEGENERATED_LINE_LENGTH*3)\r
 257                     continue;\r
 258                 double x = lh.getLink().getX();\r
 259                 double y = lh.getLink().getY();\r
 260                 if (lh.getLine().isHorizontal()) {\r
 261                     if (lh.getLink() == lh.getLine().getBegin())\r
 262                         x += dist*2;\r
 263                     else\r
 264                         x -= dist*2;\r
 265                 } else {\r
 266                     if (lh.getLink() == lh.getLine().getBegin())\r
 267                         y += dist*2;\r
 268                     else\r
 269                         y -= dist*2;\r
 270                 }\r
 271 \r
 272                 rect.setFrameFromCenter(x, y, x-cutW, y-cutH);\r
 273                 boolean hit = rect.contains(mouseX, mouseY);\r
 274                 if (hit) {\r
 275                     double distSq = distSq(x, y, mouseX, mouseY);\r
 276                     if (distSq < nearest) {\r
 277                         nearest = dist;\r
 278                         selected = lh;\r
 279                         selectedAction = Action.RECONNECT;\r
 280                     }\r
 281                 }\r
 282             }\r
 283         }\r
 284 \r
 285         return selected == null ? Pick.MISS : new Pick(selectedAction, selected);\r
 286     }\r
 287 \r
 288     private static double distSq(double x1, double y1, double x2, double y2) {\r
 289         double dx = x2 - x1;\r
 290         double dy = y2 - y1;\r
 291         return dx * dx + dy * dy;\r
 292     }\r
 293 \r
 294     private static double getScale(AffineTransform at)\r
 295     {\r
 296         double m00 = at.getScaleX();\r
 297         double m11 = at.getScaleY();\r
 298         double m10 = at.getShearY();\r
 299         double m01 = at.getShearX();\r
 300 \r
 301         return Math.sqrt(Math.abs(m00*m11 - m10*m01));\r
 302     }\r
 303 \r
 304     private static BufferedImage safeReadImage(String name) {\r
 305         try {\r
 306             URL url = HighlightActionPointsAction.class.getResource(name);\r
 307             return ImageIO.read(url);\r
 308         } catch (IOException e) {\r
 309             return null;\r
 310         }\r
 311     }\r
 312 \r
 313 }\r