1   /****************************************************************************
2    * This demo file is part of yFiles for Java 2.14.
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4    * 72070 Tuebingen, Germany. All rights reserved.
5    * 
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11   * demo is shipped with are allowed to use the demo source code as basis
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13   * governed by the rights and conditions as set out in the yFiles for Java
14   * license agreement.
15   * 
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28  package demo.view.entityrelationship.painters;
29  
30  import demo.view.flowchart.painters.FlowchartProcessPainter;
31  import y.view.GenericNodeRealizer;
32  import y.view.LineType;
33  import y.view.NodeRealizer;
34  
35  import java.awt.Shape;
36  import java.awt.geom.Rectangle2D;
37  
38  /**
39   * This is a painter to display small entity node for entity relationship diagrams (ERD).
40   *
41   * A small entity is used in the Chen notation and is displayed as a rectangle with a label.
42   * Weak entities are drawn with a double border.
43   */
44  public class ErdSmallEntityNodePainter extends FlowchartProcessPainter {
45    /**
46     * Calculates the interior shape for the specified node.
47     * @param context The node context
48     */
49    protected Shape newDecoration( final NodeRealizer context ) {
50      if (hasDoubleBorder(context)) {
51        final LineType lineType = context.getLineType();
52        final float lw = lineType.getLineWidth();
53  
54        final double offset = 2 + lw;
55  
56        final double x = context.getX();
57        final double y = context.getY();
58        final double width = context.getWidth();
59        final double height = context.getHeight();
60  
61        if (offset + lw < width * 0.5 && offset + lw < height * 0.5) {
62          return new Rectangle2D.Double(x + offset, y + offset, width - 2 * offset, height - 2 * offset);
63        } else {
64          return new Rectangle2D.Double(x, y, 0, 0);
65        }
66      } else {
67        return null;
68      }
69    }
70  
71    /**
72     * Tests if the style property {@link ErdRealizerFactory#DOUBLE_BORDER} is set for the context realizer.
73     * @param context The context node
74     * @return <code>true</code>, if style property border is set, <code>false</code> otherwise
75     */
76    protected boolean hasDoubleBorder(NodeRealizer context) {
77      return Boolean.TRUE.equals(((GenericNodeRealizer) context).getStyleProperty(ErdRealizerFactory.DOUBLE_BORDER));
78    }
79  }
80