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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 loop limit symbol of flowchart diagrams.
37   */
38  public class FlowchartLoopLimitPainter extends AbstractFlowchartPainter {
39  
40    /**
41     * Determines if this painter will paint a flowchart loop start symbol
42     * or a flowchart loop end symbol.
43     */
44    private final boolean isLoopStart;
45  
46    /**
47     * Initializes a new <code>FlowchartLoopLimitPainter</code> instance
48     * for loop start visualization.
49     */
50    public FlowchartLoopLimitPainter() {
51      this(true);
52    }
53  
54    /**
55     * Initializes a new <code>FlowchartLoopLimitPainter</code> instance
56     * for loop start or loop end visualization.
57     * @param isStart if <code>true</code>, this painter will paint the flowchart
58     * loop start symbol; otherwise it will paint the flowchart loop end symbol.
59     */
60    public FlowchartLoopLimitPainter(boolean isStart) {
61      this.isLoopStart = isStart;
62    }
63  
64    protected Shape newShape( NodeRealizer context ) {
65      double height = context.getHeight();
66      double width = context.getWidth();
67      double x = context.getX();
68      double y = context.getY();
69      double borderDistance = Math.min(Math.min(10, width/2), height/2);
70  
71      GeneralPath shape = new GeneralPath();
72      if (isLoopStart) {
73        shape.moveTo((float)(x + borderDistance), (float)y);
74        shape.lineTo((float)(x + width - borderDistance), (float)y);
75        shape.lineTo((float)(x+ width), (float)(y + borderDistance));
76        shape.lineTo((float)(x + width), (float)(y + height));
77        shape.lineTo((float)x, (float)(y + height));
78        shape.lineTo((float)x, (float)(y + borderDistance));
79        shape.closePath();
80      } else { //is loop end
81        shape.moveTo((float) x, (float) y);
82        shape.lineTo((float)(x + width), (float) y);
83        shape.lineTo((float)(x + width), (float)(y + height - borderDistance));
84        shape.lineTo((float)(x + width - borderDistance), (float)(y + height));
85        shape.lineTo((float)(x + borderDistance), (float)(y + height));
86        shape.lineTo((float) x, (float)(y + height -borderDistance));
87        shape.closePath();
88      }
89      return shape;
90    }
91  }
92