1 /** 2 * Copyright (c) 2011, Novyon Events 3 * 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * - Redistributions of source code must retain the above copyright notice, this 10 * list of conditions and the following disclaimer. 11 * 12 * - Redistributions in binary form must reproduce the above copyright notice, 13 * this list of conditions and the following disclaimer in the documentation 14 * and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * @author Anthyon 29 */ 30 package com.jme3.terrain.noise; 31 32 /** 33 * Helper class for working with colors and gradients 34 * 35 * @author Anthyon 36 * 37 */ 38 public class Color { 39 40 private final float[] rgba = new float[4]; 41 42 public Color() {} 43 44 public Color(final int r, final int g, final int b) { 45 this(r, g, b, 255); 46 } 47 48 public Color(final int r, final int g, final int b, final int a) { 49 this.rgba[0] = (r & 255) / 256f; 50 this.rgba[1] = (g & 255) / 256f; 51 this.rgba[2] = (b & 255) / 256f; 52 this.rgba[3] = (a & 255) / 256f; 53 } 54 55 public Color(final float r, final float g, final float b) { 56 this(r, g, b, 1); 57 } 58 59 public Color(final float r, final float g, final float b, final float a) { 60 this.rgba[0] = ShaderUtils.clamp(r, 0, 1); 61 this.rgba[1] = ShaderUtils.clamp(g, 0, 1); 62 this.rgba[2] = ShaderUtils.clamp(b, 0, 1); 63 this.rgba[3] = ShaderUtils.clamp(a, 0, 1); 64 } 65 66 public Color(final int h, final float s, final float b) { 67 this(h, s, b, 1); 68 } 69 70 public Color(final int h, final float s, final float b, final float a) { 71 this.rgba[3] = a; 72 if (s == 0) { 73 // achromatic ( grey ) 74 this.rgba[0] = b; 75 this.rgba[1] = b; 76 this.rgba[2] = b; 77 return; 78 } 79 80 float hh = h / 60.0f; 81 int i = ShaderUtils.floor(hh); 82 float f = hh - i; 83 float p = b * (1 - s); 84 float q = b * (1 - s * f); 85 float t = b * (1 - s * (1 - f)); 86 87 if (i == 0) { 88 this.rgba[0] = b; 89 this.rgba[1] = t; 90 this.rgba[2] = p; 91 } else if (i == 1) { 92 this.rgba[0] = q; 93 this.rgba[1] = b; 94 this.rgba[2] = p; 95 } else if (i == 2) { 96 this.rgba[0] = p; 97 this.rgba[1] = b; 98 this.rgba[2] = t; 99 } else if (i == 3) { 100 this.rgba[0] = p; 101 this.rgba[1] = q; 102 this.rgba[2] = b; 103 } else if (i == 4) { 104 this.rgba[0] = t; 105 this.rgba[1] = p; 106 this.rgba[2] = b; 107 } else { 108 this.rgba[0] = b; 109 this.rgba[1] = p; 110 this.rgba[2] = q; 111 } 112 } 113 114 public int toInteger() { 115 return 0x00000000 | (int) (this.rgba[3] * 256) << 24 | (int) (this.rgba[0] * 256) << 16 | (int) (this.rgba[1] * 256) << 8 116 | (int) (this.rgba[2] * 256); 117 } 118 119 public String toWeb() { 120 return Integer.toHexString(this.toInteger()); 121 } 122 123 public Color toGrayscale() { 124 float v = (this.rgba[0] + this.rgba[1] + this.rgba[2]) / 3f; 125 return new Color(v, v, v, this.rgba[3]); 126 } 127 128 public Color toSepia() { 129 float r = ShaderUtils.clamp(this.rgba[0] * 0.393f + this.rgba[1] * 0.769f + this.rgba[2] * 0.189f, 0, 1); 130 float g = ShaderUtils.clamp(this.rgba[0] * 0.349f + this.rgba[1] * 0.686f + this.rgba[2] * 0.168f, 0, 1); 131 float b = ShaderUtils.clamp(this.rgba[0] * 0.272f + this.rgba[1] * 0.534f + this.rgba[2] * 0.131f, 0, 1); 132 return new Color(r, g, b, this.rgba[3]); 133 } 134 } 135
