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

   1 /*
   2  * Sixth 3D engine. Author: Svjatoslav Agejenko.
   3  * This project is released under Creative Commons Zero (CC0) license.
   4  *
   5 *
   6  */
   7
   8
   9 package eu.svjatoslav.sixth.e3d.gui;
  10
  11 import eu.svjatoslav.sixth.e3d.geometry.Point3D;
  12 import eu.svjatoslav.sixth.e3d.math.GeometryCoordinate;
  13 import eu.svjatoslav.sixth.e3d.math.TransformPipe;
  14
  15 public class UserRelativityTracker {
  16
  17     private final static int minimalSliceFactor = 5;
  18     public GeometryCoordinate center = new GeometryCoordinate();
  19     public GeometryCoordinate right;
  20     public GeometryCoordinate down;
  21
  22     public UserRelativityTracker() {
  23
  24     }
  25
  26     public void analyze(final TransformPipe transformPipe,
  27                         final RenderingContext renderingContext) {
  28
  29         center.transform(transformPipe, renderingContext);
  30
  31         if (right != null) {
  32             right.transform(transformPipe, renderingContext);
  33             down.transform(transformPipe, renderingContext);
  34         }
  35     }
  36
  37     public void enableOrientationTracking() {
  38         right = new GeometryCoordinate(new Point3D(10, 0, 0));
  39         down = new GeometryCoordinate(new Point3D(0, 10, 0));
  40     }
  41
  42     public double getAngleXY() {
  43         return center.transformedCoordinate
  44                 .getAngleXY(down.transformedCoordinate);
  45     }
  46
  47     public double getAngleXZ() {
  48         return center.transformedCoordinate
  49                 .getAngleXZ(right.transformedCoordinate);
  50     }
  51
  52     public double getAngleYZ() {
  53         return center.transformedCoordinate
  54                 .getAngleYZ(down.transformedCoordinate);
  55     }
  56
  57     public double getDistanceToUser() {
  58         return center.transformedCoordinate.getVectorLength();
  59     }
  60
  61     public double proposeSliceFactor() {
  62         final double distanceToCamera = getDistanceToUser();
  63
  64         double proposedSliceFactor = distanceToCamera / 5;
  65
  66         if (proposedSliceFactor < minimalSliceFactor)
  67             proposedSliceFactor = minimalSliceFactor;
  68
  69         return proposedSliceFactor;
  70     }
  71
  72 }