bundles/org.simantics.g2d/src/org/simantics/g2d/element/handler/impl/Scaleable.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.g2d.element.handler.impl;\r
  13 \r
  14 import java.awt.geom.AffineTransform;\r
  15 import java.awt.geom.Point2D;\r
  16 import java.util.Collection;\r
  17 \r
  18 import org.simantics.g2d.canvas.ICanvasContext;\r
  19 import org.simantics.g2d.element.ElementHints;\r
  20 import org.simantics.g2d.element.IElement;\r
  21 import org.simantics.g2d.element.handler.Scale;\r
  22 import org.simantics.g2d.element.handler.Validator;\r
  23 \r
  24 /**\r
  25  * Handler for an element that can be freely scaled.\r
  26  * \r
  27  * @author Toni Kalajainen\r
  28  */\r
  29 public class Scaleable implements Scale, Validator {\r
  30 \r
  31     private static final long serialVersionUID = -4033716332747863703L;\r
  32 \r
  33     Double aspectRatio;\r
  34 \r
  35     public Scaleable(Double aspectRatio)\r
  36     {\r
  37         this.aspectRatio = aspectRatio;\r
  38     }\r
  39 \r
  40     @Override\r
  41     public Double getFixedAspectRatio(IElement e) {\r
  42         return aspectRatio;\r
  43     }\r
  44 \r
  45     @Override\r
  46     public Point2D getScale(IElement e) {\r
  47         AffineTransform at = e.getHint(ElementHints.KEY_TRANSFORM);\r
  48         return _getScale(at);\r
  49     }   \r
  50 \r
  51     @Override\r
  52     public void setScale(IElement e, Point2D newScale) {\r
  53         Point2D oldScale = getScale(e);\r
  54         double sx = newScale.getX() / oldScale.getX();\r
  55         double sy = newScale.getY() / oldScale.getY();\r
  56         AffineTransform at = e.getHint(ElementHints.KEY_TRANSFORM);\r
  57         at = new AffineTransform(at);\r
  58         at.scale(sx, sy);\r
  59         e.setHint(ElementHints.KEY_TRANSFORM, at);\r
  60     }\r
  61 \r
  62     @Override\r
  63     public Point2D getMaximumScale(IElement e) {\r
  64         return null;\r
  65     }\r
  66 \r
  67     @Override\r
  68     public Point2D getMinimumScale(IElement e) {\r
  69         return null;\r
  70     }\r
  71 \r
  72     private static Point2D _getScale(AffineTransform at) {\r
  73         double m00 = at.getScaleX();\r
  74         double m11 = at.getScaleY();\r
  75         double m10 = at.getShearY();\r
  76         double m01 = at.getShearX();\r
  77         // Project unit vector to canvas\r
  78         double sx = Math.sqrt( m00*m00+m10*m10 );\r
  79         double sy = Math.sqrt( m01*m01+m11*m11 );\r
  80         return new Point2D.Double(sx, sy);\r
  81     }\r
  82 \r
  83     @Override\r
  84     public void validate(final IElement e, final ICanvasContext ctx, Collection<Issue> lst) {\r
  85         /*\r
  86                 if (aspectRatio!=null)\r
  87                 {\r
  88                         // Validate aspect ratio\r
  89                         final Point2D scale = getScale(e);\r
  90                         double currentRatio = scale.getX() / scale.getY();\r
  91                         if (Math.abs(currentRatio - aspectRatio)>0.000001)\r
  92                         {\r
  93                                 lst.add(new Issue() {\r
  94                                         @Override\r
  95                                         public String getMessage() {\r
  96                                                 return "Aspect ratio is wrong";\r
  97                                         }\r
  98                                         @Override\r
  99                                         public void addSuggestions(Collection<Suggestion> suggestionList) {\r
 100                                                 suggestionList.add(new Suggestion() {\r
 101                                                         @Override\r
 102                                                         public boolean fix() {\r
 103                                                                 double newSx = scale.getX();\r
 104                                                                 double newSy = newSx * aspectRatio;\r
 105                                                                 Point2D newScale = new Point2D.Double(newSx, newSy);\r
 106                                                                 setScale(e, newScale);\r
 107                                                                 ctx.setDirty();\r
 108                                                                 return true;\r
 109                                                         }\r
 110                                                         @Override\r
 111                                                         public String getMessage() {\r
 112                                                                 return "Scale height, keep width";\r
 113                                                         }});\r
 114                                         }});\r
 115                         }\r
 116                         // TODO min scale validator\r
 117                         // TODO max scale validator\r
 118                 }\r
 119          */\r
 120     }\r
 121 \r
 122 \r
 123 }\r