src/main/java/eu/svjatoslav/sixth/e3d/renderer/raster/shapes/basic/texturedpolygon/PolygonBorderInterpolator.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 package eu.svjatoslav.sixth.e3d.renderer.raster.shapes.basic.texturedpolygon;
   9
  10 import eu.svjatoslav.sixth.e3d.geometry.Point2D;
  11
  12 public class PolygonBorderInterpolator implements
  13         Comparable<PolygonBorderInterpolator> {
  14
  15     // on-screen coordinates
  16     Point2D p1;
  17     Point2D p2;
  18     double distanceFromY1;
  19     private int height;
  20     private int width;
  21     private int absoluteHeight;
  22     private double twidth;
  23     private double theight;
  24     // texture coordinates
  25     private Point2D tp1;
  26     private Point2D tp2;
  27
  28
  29     @Override
  30     public boolean equals(final Object o) {
  31         if (o == null) return false;
  32
  33         return o instanceof PolygonBorderInterpolator && compareTo((PolygonBorderInterpolator) o) == 0;
  34     }
  35
  36     @Override
  37     public int hashCode() {
  38         int result = width;
  39         result = 31 * result + absoluteHeight;
  40         return result;
  41     }
  42
  43     @Override
  44     public int compareTo(final PolygonBorderInterpolator o) {
  45         if (absoluteHeight < o.absoluteHeight)
  46             return 1;
  47         if (absoluteHeight > o.absoluteHeight)
  48             return -1;
  49
  50         if (width < o.width)
  51             return 1;
  52         if (width > o.width)
  53             return -1;
  54
  55         return 0;
  56     }
  57
  58     public boolean containsY(final int y) {
  59
  60         if (p1.y < p2.y) {
  61             if (y >= p1.y)
  62                 if (y <= p2.y)
  63                     return true;
  64         } else if (y >= p2.y)
  65             if (y <= p1.y)
  66                 return true;
  67
  68         return false;
  69     }
  70
  71     public double getTX() {
  72
  73         if (height == 0)
  74             return (tp2.x + tp1.x) / 2d;
  75
  76         return tp1.x + ((twidth * distanceFromY1) / height);
  77     }
  78
  79     public double getTY() {
  80
  81         if (height == 0)
  82             return (tp2.y + tp1.y) / 2d;
  83
  84         return tp1.y + ((theight * distanceFromY1) / height);
  85     }
  86
  87     public int getX() {
  88
  89         if (height == 0)
  90             return (int) ((p2.x + p1.x) / 2d);
  91
  92         return (int) (p1.x + ((width * distanceFromY1) / height));
  93     }
  94
  95     public void setCurrentY(final int y) {
  96         distanceFromY1 = y - p1.y;
  97     }
  98
  99     public void setPoints(final Point2D p1, final Point2D p2,
 100                           final Point2D tp1, final Point2D tp2) {
 101
 102         this.p1 = p1;
 103         this.p2 = p2;
 104         this.tp1 = tp1;
 105         this.tp2 = tp2;
 106
 107         height = (int) (p2.y - p1.y);
 108         width = (int) (p2.x - p1.x);
 109         absoluteHeight = Math.abs(height);
 110
 111         twidth = tp2.x - tp1.x;
 112         theight = tp2.y - tp1.y;
 113     }
 114
 115 }