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

   1 /*
   2  * Sixth 3D engine. Copyright ©2012-2016, 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 final Color color;
  24
  25     private static final Set<GlowingPoint> glowingPoints = Collections.newSetFromMap(new WeakHashMap<GlowingPoint, Boolean>());
  26
  27     public GlowingPoint(final Point3D point, final double pointSize,
  28                         final Color color) {
  29         super(point, pointSize, getTexture(color));
  30         this.color = color;
  31     }
  32
  33     private static Texture getTexture(final Color color) {
  34         // attempt to reuse texture from existing glowing point of the same color
  35         for (GlowingPoint glowingPoint : glowingPoints)
  36             if (color.equals(glowingPoint.color)) return glowingPoint.texture;
  37
  38         // existing texture not found, creating new one
  39         return createTexture(color);
  40     }
  41
  42     private static Texture createTexture(final Color color) {
  43         final Texture texture = new Texture(TEXTURE_SIZE, TEXTURE_SIZE, 1);
  44         for (int x = 0; x < TEXTURE_SIZE; x++)
  45             for (int y = 0; y < TEXTURE_SIZE; y++) {
  46                 int address = texture.primaryBitmap.getAddress(x, y);
  47
  48                 final int distance = (int) Math
  49                         .sqrt((((TEXTURE_SIZE / 2) - x) * ((TEXTURE_SIZE / 2) - x))
  50                                 + (((TEXTURE_SIZE / 2) - y) * ((TEXTURE_SIZE / 2) - y)));
  51
  52                 int alpha = 255 - ((270 * distance) / (TEXTURE_SIZE / 2));
  53                 if (alpha < 0)
  54                     alpha = 0;
  55
  56                 texture.primaryBitmap.bytes[address] = (byte) alpha;
  57                 address++;
  58                 texture.primaryBitmap.bytes[address] = (byte) color.b;
  59                 address++;
  60                 texture.primaryBitmap.bytes[address] = (byte) color.g;
  61                 address++;
  62                 texture.primaryBitmap.bytes[address] = (byte) color.r;
  63             }
  64
  65         return texture;
  66     }
  67
  68 }