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 package eu.svjatoslav.sixth.e3d.gui;
   6
   7 import eu.svjatoslav.sixth.e3d.geometry.Point3D;
   8 import eu.svjatoslav.sixth.e3d.math.TransformsStack;
   9 import eu.svjatoslav.sixth.e3d.math.Vertex;
  10
  11 public class UserRelativityTracker {
  12
  13     private final static int minimalSliceFactor = 5;
  14     public Vertex center = new Vertex();
  15     public Vertex right;
  16     public Vertex down;
  17
  18     public UserRelativityTracker() {
  19
  20     }
  21
  22     public void analyze(final TransformsStack transformPipe,
  23                         final RenderingContext renderingContext) {
  24
  25         center.calculateLocationRelativeToViewer(transformPipe, renderingContext);
  26
  27         if (right != null) {
  28             right.calculateLocationRelativeToViewer(transformPipe, renderingContext);
  29             down.calculateLocationRelativeToViewer(transformPipe, renderingContext);
  30         }
  31     }
  32
  33     public void enableOrientationTracking() {
  34         right = new Vertex(new Point3D(10, 0, 0));
  35         down = new Vertex(new Point3D(0, 10, 0));
  36     }
  37
  38     public double getAngleXY() {
  39         return center.transformedCoordinate
  40                 .getAngleXY(down.transformedCoordinate);
  41     }
  42
  43     public double getAngleXZ() {
  44         return center.transformedCoordinate
  45                 .getAngleXZ(right.transformedCoordinate);
  46     }
  47
  48     public double getAngleYZ() {
  49         return center.transformedCoordinate
  50                 .getAngleYZ(down.transformedCoordinate);
  51     }
  52
  53     public double getDistanceToUser() {
  54         return center.transformedCoordinate.getVectorLength();
  55     }
  56
  57     public double proposeSliceFactor() {
  58         final double distanceToCamera = getDistanceToUser();
  59
  60         double proposedSliceFactor = distanceToCamera / 5;
  61
  62         if (proposedSliceFactor < minimalSliceFactor)
  63             proposedSliceFactor = minimalSliceFactor;
  64
  65         return proposedSliceFactor;
  66     }
  67
  68 }