src/main/java/eu/svjatoslav/sixth/e3d/renderer/raster/shapes/basic/GlowingPoint.java

   1 /*
   2  * Sixth 3D engine. Copyright ©2012-2018, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 3 of the GNU Lesser General Public License
   6  * or later as published by the Free Software Foundation.
   7  *
   8  */
   9
  10 package eu.svjatoslav.sixth.e3d.renderer.raster.shapes.basic;
  11
  12 import eu.svjatoslav.sixth.e3d.geometry.Point3D;
  13 import eu.svjatoslav.sixth.e3d.renderer.raster.Color;
  14 import eu.svjatoslav.sixth.e3d.renderer.raster.texture.Texture;
  15
  16 import java.util.Collections;
  17 import java.util.Set;
  18 import java.util.WeakHashMap;
  19
  20 public class GlowingPoint extends ForwardOrientedTexture {
  21
  22     private static final int TEXTURE_SIZE = 50;
  23     private static final Set<GlowingPoint> glowingPoints = Collections.newSetFromMap(new WeakHashMap<GlowingPoint, Boolean>());
  24     private final Color color;
  25
  26     public GlowingPoint(final Point3D point, final double pointSize,
  27                         final Color color) {
  28         super(point, pointSize, getTexture(color));
  29         this.color = color;
  30
  31         synchronized (glowingPoints) {
  32             glowingPoints.add(this);
  33         }
  34     }
  35
  36     private static Texture getTexture(final Color color) {
  37         // attempt to reuse texture from existing glowing point of the same color
  38         synchronized (glowingPoints) {
  39             for (GlowingPoint glowingPoint : glowingPoints)
  40                 if (color.equals(glowingPoint.color))
  41                     return glowingPoint.texture;
  42         }
  43
  44         // existing texture not found, creating new one
  45         return createTexture(color);
  46     }
  47
  48     private static Texture createTexture(final Color color) {
  49         final Texture texture = new Texture(TEXTURE_SIZE, TEXTURE_SIZE, 1);
  50         for (int x = 0; x < TEXTURE_SIZE; x++)
  51             for (int y = 0; y < TEXTURE_SIZE; y++) {
  52                 int address = texture.primaryBitmap.getAddress(x, y);
  53
  54                 final int distance = (int) Math
  55                         .sqrt((((TEXTURE_SIZE / 2) - x) * ((TEXTURE_SIZE / 2) - x))
  56                                 + (((TEXTURE_SIZE / 2) - y) * ((TEXTURE_SIZE / 2) - y)));
  57
  58                 int alpha = 255 - ((270 * distance) / (TEXTURE_SIZE / 2));
  59                 if (alpha < 0)
  60                     alpha = 0;
  61
  62                 texture.primaryBitmap.bytes[address] = (byte) alpha;
  63                 address++;
  64                 texture.primaryBitmap.bytes[address] = (byte) color.b;
  65                 address++;
  66                 texture.primaryBitmap.bytes[address] = (byte) color.g;
  67                 address++;
  68                 texture.primaryBitmap.bytes[address] = (byte) color.r;
  69             }
  70
  71         return texture;
  72     }
  73
  74 }