src/main/java/eu/svjatoslav/sixth/e3d/gui/UserRelativityTracker.java

   1 /*
   2  * Sixth 3D engine. Copyright ©2012-2018, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 3 of the GNU Lesser General Public License
   6  * or later as published by the Free Software Foundation.
   7  *
   8  */
   9
  10
  11 package eu.svjatoslav.sixth.e3d.gui;
  12
  13 import eu.svjatoslav.sixth.e3d.math.GeometryCoordinate;
  14 import eu.svjatoslav.sixth.e3d.geometry.Point3D;
  15 import eu.svjatoslav.sixth.e3d.math.TransformPipe;
  16
  17 public class UserRelativityTracker {
  18
  19     private final static int minimalSliceFactor = 5;
  20     public GeometryCoordinate center = new GeometryCoordinate();
  21     public GeometryCoordinate right;
  22     public GeometryCoordinate down;
  23
  24     public UserRelativityTracker() {
  25
  26     }
  27
  28     public void analyze(final TransformPipe transformPipe,
  29                         final RenderingContext renderingContext) {
  30
  31         center.transform(transformPipe, renderingContext);
  32
  33         if (right != null) {
  34             right.transform(transformPipe, renderingContext);
  35             down.transform(transformPipe, renderingContext);
  36         }
  37     }
  38
  39     public void enableOrientationTracking() {
  40         right = new GeometryCoordinate(new Point3D(10, 0, 0));
  41         down = new GeometryCoordinate(new Point3D(0, 10, 0));
  42     }
  43
  44     public double getAngleXY() {
  45         return center.transformedCoordinate
  46                 .getAngleXY(down.transformedCoordinate);
  47     }
  48
  49     public double getAngleXZ() {
  50         return center.transformedCoordinate
  51                 .getAngleXZ(right.transformedCoordinate);
  52     }
  53
  54     public double getAngleYZ() {
  55         return center.transformedCoordinate
  56                 .getAngleYZ(down.transformedCoordinate);
  57     }
  58
  59     public double getDistanceToUser() {
  60         return center.transformedCoordinate.getVectorLength();
  61     }
  62
  63     public double proposeSliceFactor() {
  64         final double distanceToCamera = getDistanceToUser();
  65
  66         double proposedSliceFactor = distanceToCamera / 5;
  67
  68         if (proposedSliceFactor < minimalSliceFactor)
  69             proposedSliceFactor = minimalSliceFactor;
  70
  71         return proposedSliceFactor;
  72     }
  73
  74 }