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4    * 72070 Tuebingen, Germany. All rights reserved.
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28  package demo.view.flowchart.painters;
29  
30  import y.view.NodeRealizer;
31  
32  import java.awt.Shape;
33  import java.awt.geom.GeneralPath;
34  
35  /**
36   * Draws the message symbols of flowchart diagrams.
37   * There are two types of messages: user messages and network messages.
38   */
39  public class FlowchartMessagePainter extends AbstractFlowchartPainter{
40  
41    /**
42     * Determines if this painter will paint a flowchart user message symbol
43     * or a flowchart network message symbol.
44     */
45    private final boolean isUserMessage;
46  
47    /**
48     * Initializes a new <code>FlowchartMessagePainter</code> instance for
49     * user message or network message visualization.
50     * @param type if <code>true</code>, this painter will paint the user message
51     * symbol; otherwise it will paint the network message symbol.
52     */
53    public FlowchartMessagePainter( boolean type ) {
54      isUserMessage = type;
55    }
56  
57    protected Shape newShape( NodeRealizer context ) {
58      double x = context.getX();
59      double y = context.getY();
60      double height = context.getHeight();
61      double width = context.getWidth();
62      double borderDistance = Math.min(FLOWCHART_DEFAULT_MESSAGE_INCLINATION *height, FLOWCHART_DEFAULT_MESSAGE_INCLINATION *width);
63  
64      GeneralPath shapePath = new GeneralPath();
65      if (isUserMessage) {
66        shapePath.moveTo((float) x, (float) y);
67        shapePath.lineTo((float) (x + width - borderDistance), (float) y);
68        shapePath.lineTo((float) (x + width), (float) (y + height*0.5));
69        shapePath.lineTo((float) (x + width - borderDistance), (float)(y + height));
70        shapePath.lineTo((float) x, (float) (y + height));
71        shapePath.closePath();
72      } else { // is network message
73        shapePath.moveTo((float) x, (float) y);
74        shapePath.lineTo((float) (x + width), (float) y);
75        shapePath.lineTo((float) (x + width), (float) (y + height));
76        shapePath.lineTo((float) x, (float) (y + height));
77        shapePath.lineTo((float) (x + borderDistance), (float) (y + height*0.5));
78        shapePath.closePath();
79      }
80      return shapePath;
81    }
82  }
83