src/main/java/eu/svjatoslav/sixth/e3d/math/GeometryCoordinate.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.math;
   6
   7 import eu.svjatoslav.sixth.e3d.geometry.Point2D;
   8 import eu.svjatoslav.sixth.e3d.geometry.Point3D;
   9 import eu.svjatoslav.sixth.e3d.gui.RenderingContext;
  10
  11 /**
  12  * A point in 3D space with a transformed and on-screen coordinates.
  13  */
  14 public class GeometryCoordinate {
  15
  16     /**
  17      * The original coordinate.
  18      */
  19     public Point3D coordinate;
  20
  21     /**
  22      * The transformed coordinate.
  23      */
  24     public Point3D transformedCoordinate;
  25
  26     /**
  27      * The on-screen coordinate.
  28      */
  29     public Point2D onScreenCoordinate;
  30
  31     private int lastTransformedFrame;
  32
  33     public GeometryCoordinate() {
  34         coordinate = new Point3D();
  35         transformedCoordinate = new Point3D();
  36         onScreenCoordinate = new Point2D();
  37     }
  38
  39     public GeometryCoordinate(final Point3D location) {
  40         coordinate = location;
  41         transformedCoordinate = new Point3D();
  42         onScreenCoordinate = new Point2D();
  43     }
  44
  45     /**
  46      * Transforms the coordinate.
  47      *
  48      * @param transforms
  49      *            The transform pipe.
  50      * @param renderContext
  51      *            The rendering context.
  52      */
  53     public void transform(final TransformsPipeline transforms,
  54                           final RenderingContext renderContext) {
  55
  56         if (lastTransformedFrame == renderContext.frameNumber)
  57             return;
  58
  59         lastTransformedFrame = renderContext.frameNumber;
  60
  61         transforms.transform(coordinate, transformedCoordinate);
  62
  63         onScreenCoordinate.x = ((transformedCoordinate.x / transformedCoordinate.z) * renderContext.zoom)
  64                 + renderContext.xCenter;
  65         onScreenCoordinate.y = ((transformedCoordinate.y / transformedCoordinate.z) * renderContext.zoom)
  66                 + renderContext.yCenter;
  67     }
  68 }