bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/g2d/nodes/SelectionNode.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.scenegraph.g2d.nodes;
  13
  14 import java.awt.BasicStroke;
  15 import java.awt.Color;
  16 import java.awt.Graphics2D;
  17 import java.awt.geom.AffineTransform;
  18 import java.awt.geom.Rectangle2D;
  19
  20 import org.simantics.scenegraph.g2d.G2DNode;
  21 import org.simantics.scenegraph.utils.GeometryUtils;
  22
  23 public class SelectionNode extends G2DNode implements Decoration {
  24     /**
  25      *
  26      */
  27     private static final long serialVersionUID = -2879575230419873230L;
  28
  29     public transient static final BasicStroke SELECTION_STROKE = new BasicStroke(1.0f,
  30             BasicStroke.CAP_SQUARE, BasicStroke.CAP_SQUARE, 10.0f,
  31             new float[] { 5.0f, 5.0f }, 0.0f);
  32
  33     protected Rectangle2D bounds = null;
  34     protected Color color = null;
  35     protected transient Rectangle2D rect;
  36     protected transient BasicStroke scaledStroke;
  37     protected transient double previousScaleRecip = Double.NaN;
  38
  39     @SyncField({"transform", "bounds", "color"})
  40     public void init(AffineTransform transform, Rectangle2D bounds, Color color) {
  41         this.transform = transform;
  42         this.bounds = bounds;
  43         this.color = color;
  44     }
  45
  46     @Override
  47     public void render(Graphics2D g) {
  48         if (bounds == null) return;
  49
  50         // Prevent exceptions during rendering.
  51         if (transform.getDeterminant() == 0)
  52             return;
  53
  54         AffineTransform ot = g.getTransform();
  55
  56         g.setColor(color);
  57         g.transform(transform);
  58
  59         AffineTransform tx = g.getTransform();
  60         //System.out.println("tx: " + tx);
  61         double scale = GeometryUtils.getScale(tx);
  62         //System.out.println("scale: " + scale);
  63         double scaleRecip = 1.0 / scale;
  64         //System.out.println("scale: " + scaleRecip);
  65
  66         // Prevent stroke reallocation while panning.
  67         // Zooming will trigger reallocation.
  68         if (scaledStroke == null || scaleRecip != previousScaleRecip) {
  69             scaledStroke = GeometryUtils.scaleStroke( SELECTION_STROKE, (float) scaleRecip);
  70             previousScaleRecip = scaleRecip;
  71         }
  72         g.setStroke(scaledStroke);
  73
  74         double padding = 5.0 * scaleRecip;
  75         double paddingX = padding;
  76         double paddingY = padding;
  77
  78         if (rect == null)
  79             rect = new Rectangle2D.Double();
  80         rect.setFrame(bounds.getMinX() - paddingX, bounds.getMinY() - paddingY,
  81                 bounds.getWidth() + 2.0*paddingX, bounds.getHeight() + 2.0*paddingY);
  82         g.draw(rect);
  83
  84         g.setTransform(ot);
  85
  86     }
  87
  88     @Override
  89     public Rectangle2D getBoundsInLocal() {
  90         return bounds;
  91     }
  92 }