src/main/java/eu/svjatoslav/sixth/e3d/renderer/raster/shapes/basic/GlowingPoint.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;
   9
  10 import eu.svjatoslav.sixth.e3d.geometry.Point3D;
  11 import eu.svjatoslav.sixth.e3d.renderer.raster.Color;
  12 import eu.svjatoslav.sixth.e3d.renderer.raster.texture.Texture;
  13
  14 import java.util.Collections;
  15 import java.util.Set;
  16 import java.util.WeakHashMap;
  17
  18 public class GlowingPoint extends ForwardOrientedTexture {
  19
  20     private static final int TEXTURE_SIZE = 50;
  21     private static final Set<GlowingPoint> glowingPoints = Collections.newSetFromMap(new WeakHashMap<>());
  22     private final Color color;
  23
  24     public GlowingPoint(final Point3D point, final double pointSize,
  25                         final Color color) {
  26         super(point, pointSize, getTexture(color));
  27         this.color = color;
  28
  29         synchronized (glowingPoints) {
  30             glowingPoints.add(this);
  31         }
  32     }
  33
  34     private static Texture getTexture(final Color color) {
  35         // attempt to reuse texture from existing glowing point of the same color
  36         synchronized (glowingPoints) {
  37             for (GlowingPoint glowingPoint : glowingPoints)
  38                 if (color.equals(glowingPoint.color))
  39                     return glowingPoint.texture;
  40         }
  41
  42         // existing texture not found, creating new one
  43         return createTexture(color);
  44     }
  45
  46     private static Texture createTexture(final Color color) {
  47         final Texture texture = new Texture(TEXTURE_SIZE, TEXTURE_SIZE, 1);
  48         for (int x = 0; x < TEXTURE_SIZE; x++)
  49             for (int y = 0; y < TEXTURE_SIZE; y++) {
  50                 int address = texture.primaryBitmap.getAddress(x, y);
  51
  52                 final int distance = (int) Math
  53                         .sqrt((((TEXTURE_SIZE / 2) - x) * ((TEXTURE_SIZE / 2) - x))
  54                                 + (((TEXTURE_SIZE / 2) - y) * ((TEXTURE_SIZE / 2) - y)));
  55
  56                 int alpha = 255 - ((270 * distance) / (TEXTURE_SIZE / 2));
  57                 if (alpha < 0)
  58                     alpha = 0;
  59
  60                 texture.primaryBitmap.bytes[address] = (byte) alpha;
  61                 address++;
  62                 texture.primaryBitmap.bytes[address] = (byte) color.b;
  63                 address++;
  64                 texture.primaryBitmap.bytes[address] = (byte) color.g;
  65                 address++;
  66                 texture.primaryBitmap.bytes[address] = (byte) color.r;
  67             }
  68
  69         return texture;
  70     }
  71
  72 }