plugins/net.mograsim.logic.model/src/net/mograsim/logic/model/model/components/OrientationCalculator.java

   1 package net.mograsim.logic.model.model.components;
   2
   3 /**
   4  * This class simplifies the calculation of coordinates, especially for model components.
   5  * <p>
   6  * Supply it with the original width and height and an orientation, and use the methods {@link #newX(double, double)} and
   7  * {@link #newY(double, double)} to retrieve the new coordinates, relative to the upper left corner of {@link Orientation#RIGHT}. The
   8  * {@link #height()} and {@link #width()} methods return the width and height in the new orientation.
   9  * <p>
  10  * This is meant to be used in the context of a a classic display coordinate system, as done in the {@link ModelComponent}s.
  11  *
  12  * @see Orientation
  13  * @author Christian Femers
  14  */
  15 public class OrientationCalculator
  16 {
  17         final Orientation o;
  18         final double oldWHalf;
  19         final double oldHHalf;
  20         final double w;
  21         final double h;
  22         final double wHalf;
  23         final double hHalf;
  24
  25         public OrientationCalculator(Orientation o, double width, double height)
  26         {
  27                 this.o = o;
  28                 this.oldWHalf = width / 2;
  29                 this.oldHHalf = height / 2;
  30
  31                 if (o.swapsWidthAndHeight())
  32                 {
  33                         w = height;
  34                         h = width;
  35                         wHalf = oldHHalf;
  36                         hHalf = oldWHalf;
  37                 } else
  38                 {
  39                         w = width;
  40                         h = height;
  41                         wHalf = oldWHalf;
  42                         hHalf = oldHHalf;
  43                 }
  44         }
  45
  46         /**
  47          * Returns the new height (that equals the old width if {@link Orientation#swapsWidthAndHeight()} is true)
  48          */
  49         public double height()
  50         {
  51                 return h;
  52         }
  53
  54         /**
  55          * Returns the new width (that equals the old height if {@link Orientation#swapsWidthAndHeight()} is true)
  56          */
  57         public double width()
  58         {
  59                 return w;
  60         }
  61
  62         public double newX(double x, double y)
  63         {
  64                 return (x - oldWHalf) * o.trans11 + (y - oldHHalf) * o.trans12 + wHalf;
  65         }
  66
  67         public double newY(double x, double y)
  68         {
  69                 return (x - oldWHalf) * o.trans21 + (y - oldHHalf) * o.trans22 + hHalf;
  70         }
  71
  72         public final Orientation getOrientation()
  73         {
  74                 return o;
  75         }
  76 }