git.gag.com Git - debian/openrocket/blob - core/src/net/sf/openrocket/gui/figureelements/CPCaret.java

   1 package net.sf.openrocket.gui.figureelements;
   2
   3 import java.awt.Color;
   4 import java.awt.geom.Area;
   5 import java.awt.geom.Ellipse2D;
   6
   7 /**
   8  * A mark indicating the position of the center of pressure.  It is a red filled circle
   9  * inside a slightly larger red circle.
  10  *
  11  * @author Sampo Niskanen <sampo.niskanen@iki.fi>
  12  */
  13
  14 public class CPCaret extends Caret {
  15         private static final float RADIUS = 7;
  16
  17         private static Area caret = null;
  18
  19         /**
  20          * Create a new CPCaret at the specified coordinates.
  21          */
  22         public CPCaret(double x, double y) {
  23                 super(x,y);
  24         }
  25
  26         /**
  27          * Returns the Area object of the caret.  The Area object is created only once,
  28          * after which new copies are cloned from it.
  29          */
  30         @Override
  31         protected Area getCaret() {
  32                 if (caret != null) {
  33                         return (Area)caret.clone();
  34                 }
  35
  36                 Ellipse2D.Float e = new Ellipse2D.Float(-RADIUS,-RADIUS,2*RADIUS,2*RADIUS);
  37                 caret = new Area(e);
  38
  39                 caret.subtract(new Area(new Ellipse2D.Float(-RADIUS*0.9f,-RADIUS*0.9f,
  40                                 2*0.9f*RADIUS,2*0.9f*RADIUS)));
  41
  42                 caret.add(new Area(new Ellipse2D.Float(-RADIUS*0.75f,-RADIUS*0.75f,
  43                                 2*0.75f*RADIUS,2*0.75f*RADIUS)));
  44
  45                 return (Area) caret.clone();
  46         }
  47
  48
  49         /**
  50          * Return the color of the caret (red).
  51          */
  52         @Override
  53         protected Color getColor() {
  54                 return Color.RED;
  55         }
  56 }