src/main/java/eu/svjatoslav/sixth/e3d/math/Vertex.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  * It is used to store coordinates of vertices of 3D objects.
  13  * It is also used to store coordinates of points in 3D space.
  14  */
  15 public class Vertex {
  16
  17     /**
  18      * Vertex coordinate in 3D space.
  19      */
  20     public Point3D coordinate;
  21
  22     /**
  23      * Vertex coordinate relative to the viewer after transformation.
  24      */
  25     public Point3D transformedCoordinate;
  26
  27     /**
  28      * Vertex coordinate on screen after transformation.
  29      */
  30     public Point2D onScreenCoordinate;
  31
  32     private int lastTransformedFrame;
  33
  34     public Vertex() {
  35         coordinate = new Point3D();
  36         transformedCoordinate = new Point3D();
  37         onScreenCoordinate = new Point2D();
  38     }
  39
  40     public Vertex(final Point3D location) {
  41         coordinate = location;
  42         transformedCoordinate = new Point3D();
  43         onScreenCoordinate = new Point2D();
  44     }
  45
  46     /**
  47      * Transforms the coordinate.
  48      *
  49      * @param transforms The transforms pipeline.
  50      * @param renderContext The rendering context.
  51      */
  52     public void transform(final TransformsPipeline transforms,
  53                           final RenderingContext renderContext) {
  54
  55         if (lastTransformedFrame == renderContext.frameNumber)
  56             return;
  57
  58         lastTransformedFrame = renderContext.frameNumber;
  59
  60         transforms.transform(coordinate, transformedCoordinate);
  61
  62         onScreenCoordinate.x = ((transformedCoordinate.x / transformedCoordinate.z) * renderContext.zoom);
  63         onScreenCoordinate.y = ((transformedCoordinate.y / transformedCoordinate.z) * renderContext.zoom);
  64         onScreenCoordinate.add(renderContext.centerCoordinate);
  65     }
  66 }