1 | /* -*-c++-*- |
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2 | * Copyright (C) 2008 Cedric Pinson <cedric.pinson@plopbyte.net> |
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3 | * |
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4 | * This library is open source and may be redistributed and/or modified under |
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5 | * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or |
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6 | * (at your option) any later version. The full license is in LICENSE file |
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7 | * included with this distribution, and on the openscenegraph.org website. |
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8 | * |
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9 | * This library is distributed in the hope that it will be useful, |
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10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 | * OpenSceneGraph Public License for more details. |
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13 | */ |
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14 | |
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15 | #ifndef OSGANIMATION_EASE_MOTION |
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16 | #define OSGANIMATION_EASE_MOTION 1 |
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17 | |
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18 | #include <osg/Referenced> |
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19 | #include <osg/ref_ptr> |
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20 | #include <osg/Notify> |
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21 | #include <osg/Math> |
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22 | #include <vector> |
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23 | |
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24 | namespace osgAnimation |
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25 | { |
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26 | struct OutBounceFunction |
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27 | { |
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28 | inline static void getValueAt(float t, float& result) |
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29 | { |
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30 | if ((t) < (1/2.75)) |
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31 | { |
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32 | result = 7.5625 * t * t; |
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33 | } |
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34 | else if (t < (2/2.75)) |
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35 | { |
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36 | t = t - (1.5/2.75); |
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37 | result = 7.5625* t * t + .75; |
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38 | } |
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39 | else if (t < (2.5/2.75)) |
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40 | { |
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41 | t = t - (2.25/2.75); |
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42 | result = 7.5625 * t * t + .9375; |
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43 | } |
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44 | else |
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45 | { |
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46 | t = t - (2.625/2.75); |
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47 | result = 7.5625* t * t + .984375; |
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48 | } |
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49 | } |
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50 | }; |
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51 | |
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52 | struct InBounceFunction |
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53 | { |
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54 | inline static void getValueAt(float t, float& result) |
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55 | { |
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56 | OutBounceFunction::getValueAt(1-t, result); |
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57 | result = 1 - result; |
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58 | } |
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59 | }; |
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60 | |
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61 | struct InOutBounceFunction |
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62 | { |
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63 | inline static void getValueAt(float t, float& result) |
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64 | { |
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65 | if (t < 0.5) |
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66 | { |
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67 | InBounceFunction::getValueAt(t * 2, result); |
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68 | result *= 0.5; |
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69 | } |
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70 | else |
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71 | { |
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72 | OutBounceFunction::getValueAt(t * 2 - 1 , result); |
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73 | result = result * 0.5 + 0.5; |
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74 | } |
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75 | } |
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76 | }; |
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77 | |
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78 | /// Linear function |
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79 | struct LinearFunction |
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80 | { |
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81 | inline static void getValueAt(float t, float& result) { result = t;} |
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82 | }; |
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83 | |
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84 | /// Quad function |
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85 | struct OutQuadFunction |
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86 | { |
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87 | inline static void getValueAt(float t, float& result) { result = - (t * (t -2.0));} |
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88 | }; |
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89 | |
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90 | struct InQuadFunction |
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91 | { |
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92 | inline static void getValueAt(float t, float& result) { result = t*t;} |
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93 | }; |
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94 | |
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95 | struct InOutQuadFunction |
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96 | { |
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97 | inline static void getValueAt(float t, float& result) |
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98 | { |
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99 | t *= 2.0; |
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100 | if (t < 1.0) |
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101 | result = 0.5 * t * t; |
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102 | else |
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103 | { |
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104 | t -= 1.0; |
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105 | result = - 0.5 * (t * ( t - 2) - 1); |
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106 | } |
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107 | } |
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108 | }; |
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109 | |
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110 | /// Cubic function |
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111 | struct OutCubicFunction |
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112 | { |
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113 | inline static void getValueAt(float t, float& result) { t = t-1.0; result = t*t*t + 1;} |
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114 | }; |
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115 | |
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116 | struct InCubicFunction |
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117 | { |
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118 | inline static void getValueAt(float t, float& result) { result = t*t*t;} |
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119 | }; |
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120 | |
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121 | struct InOutCubicFunction |
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122 | { |
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123 | inline static void getValueAt(float t, float& result) |
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124 | { |
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125 | t *= 2.0f; |
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126 | if (t < 1.0f) |
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127 | result = 0.5f * t * t * t; |
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128 | else { |
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129 | t -= 2.0f; |
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130 | result = 0.5 * (t * t * t + 2.0f); |
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131 | } |
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132 | } |
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133 | }; |
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134 | |
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135 | /// Quart function |
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136 | struct InQuartFunction |
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137 | { |
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138 | inline static void getValueAt(float t, float& result) { result = t*t*t*t*t;} |
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139 | }; |
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140 | |
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141 | struct OutQuartFunction |
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142 | { |
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143 | inline static void getValueAt(float t, float& result) { t = t - 1; result = - (t*t*t*t -1); } |
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144 | }; |
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145 | |
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146 | struct InOutQuartFunction |
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147 | { |
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148 | inline static void getValueAt(float t, float& result) |
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149 | { |
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150 | t = t * 2.0; |
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151 | if ( t < 1) |
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152 | result = 0.5*t*t*t*t; |
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153 | else |
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154 | { |
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155 | t -= 2.0; |
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156 | result = -0.5 * (t*t*t*t -2); |
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157 | } |
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158 | } |
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159 | }; |
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160 | |
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161 | /// Elastic function |
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162 | struct OutElasticFunction |
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163 | { |
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164 | inline static void getValueAt(float t, float& result) |
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165 | { |
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166 | result = pow(2.0f, -10.0f * t) * sinf((t - 0.3f / 4.0f) * (2.0f * osg::PI) / 0.3f) + 1.0f; |
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167 | } |
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168 | }; |
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169 | |
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170 | struct InElasticFunction |
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171 | { |
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172 | inline static void getValueAt(float t, float& result) |
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173 | { |
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174 | OutElasticFunction::getValueAt(1.0f - t, result); |
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175 | result = 1.0f - result; |
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176 | } |
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177 | }; |
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178 | |
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179 | struct InOutElasticFunction |
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180 | { |
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181 | inline static void getValueAt(float t, float& result) |
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182 | { |
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183 | t *= 2.0f; |
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184 | if (t < 1.0f) |
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185 | { |
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186 | t -= 1.0f; |
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187 | result = -0.5 * (1.0f * pow(2.0f, 10.0f * t) * sinf((t - 0.45f / 4.0f) * (2.0f * osg::PI) / 0.45f)); |
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188 | } |
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189 | else |
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190 | { |
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191 | t -= 1.0f; |
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192 | result = pow(2.0f, -10.0f * t) * sinf((t - 0.45f / 4.0f) * (2.0f * osg::PI) / 0.45f) * 0.5f + 1.0f; |
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193 | } |
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194 | } |
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195 | }; |
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196 | |
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197 | // Sine function |
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198 | struct OutSineFunction |
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199 | { |
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200 | inline static void getValueAt(float t, float& result) |
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201 | { |
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202 | result = sinf(t * (osg::PI / 2.0f)); |
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203 | } |
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204 | }; |
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205 | |
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206 | struct InSineFunction |
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207 | { |
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208 | inline static void getValueAt(float t, float& result) |
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209 | { |
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210 | result = -cosf(t * (osg::PI / 2.0f)) + 1.0f; |
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211 | } |
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212 | }; |
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213 | |
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214 | struct InOutSineFunction |
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215 | { |
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216 | inline static void getValueAt(float t, float& result) |
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217 | { |
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218 | result = -0.5f * (cosf((osg::PI * t)) - 1.0f); |
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219 | } |
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220 | }; |
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221 | |
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222 | // Back function |
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223 | struct OutBackFunction |
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224 | { |
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225 | inline static void getValueAt(float t, float& result) |
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226 | { |
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227 | t -= 1.0f; |
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228 | result = t * t * ((1.70158 + 1.0f) * t + 1.70158) + 1.0f; |
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229 | } |
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230 | }; |
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231 | |
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232 | struct InBackFunction |
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233 | { |
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234 | inline static void getValueAt(float t, float& result) |
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235 | { |
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236 | result = t * t * ((1.70158 + 1.0f) * t - 1.70158); |
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237 | } |
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238 | }; |
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239 | |
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240 | struct InOutBackFunction |
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241 | { |
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242 | inline static void getValueAt(float t, float& result) |
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243 | { |
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244 | float s = 1.70158 * 1.525f; |
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245 | t *= 2.0f; |
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246 | if (t < 1.0f) |
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247 | { |
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248 | result = 0.5f * (t * t * ((s + 1.0f) * t - s)); |
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249 | } |
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250 | else |
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251 | { |
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252 | float p = t -= 2.0f; |
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253 | result = 0.5f * ((p) * t * ((s + 1.0f) * t + s) + 2.0f); |
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254 | } |
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255 | } |
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256 | }; |
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257 | |
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258 | // Circ function |
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259 | struct OutCircFunction |
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260 | { |
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261 | inline static void getValueAt(float t, float& result) |
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262 | { |
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263 | t -= 1.0f; |
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264 | result = sqrt(1.0f - t * t); |
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265 | } |
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266 | }; |
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267 | |
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268 | struct InCircFunction |
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269 | { |
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270 | inline static void getValueAt(float t, float& result) |
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271 | { |
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272 | result = -(sqrt(1.0f - (t * t)) - 1.0f); |
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273 | } |
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274 | }; |
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275 | |
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276 | struct InOutCircFunction |
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277 | { |
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278 | inline static void getValueAt(float t, float& result) |
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279 | { |
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280 | t *= 2.0f; |
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281 | if (t < 1.0f) |
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282 | { |
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283 | result = -0.5f * (sqrt(1.0f - t * t) - 1.0f); |
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284 | } |
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285 | else |
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286 | { |
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287 | t -= 2.0f; |
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288 | result = 0.5f * (sqrt(1 - t * t) + 1.0f); |
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289 | } |
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290 | } |
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291 | }; |
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292 | |
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293 | // Expo function |
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294 | struct OutExpoFunction |
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295 | { |
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296 | inline static void getValueAt(float t, float& result) |
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297 | { |
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298 | if(t == 1.0f) |
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299 | { |
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300 | result = 0.0f; |
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301 | } |
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302 | else |
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303 | { |
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304 | result = -powf(2.0f, -10.0f * t) + 1.0f; |
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305 | } |
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306 | } |
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307 | }; |
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308 | |
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309 | struct InExpoFunction |
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310 | { |
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311 | inline static void getValueAt(float t, float& result) |
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312 | { |
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313 | if(t == 0.0f) |
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314 | { |
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315 | result = 0.0f; |
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316 | } |
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317 | else |
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318 | { |
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319 | result = powf(2.0f, 10.0f * (t - 1.0f)); |
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320 | } |
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321 | } |
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322 | }; |
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323 | |
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324 | struct InOutExpoFunction |
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325 | { |
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326 | inline static void getValueAt(float t, float& result) |
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327 | { |
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328 | if(t == 0.0f || t == 1.0f) |
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329 | { |
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330 | result = 0.0f; |
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331 | } |
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332 | else |
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333 | { |
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334 | t *= 2.0f; |
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335 | if(t < 1.0f) |
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336 | { |
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337 | result = 0.5f * powf(2.0f, 10.0f * (t - 1.0f)); |
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338 | } |
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339 | else |
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340 | { |
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341 | result = 0.5f * (-powf(2.0f, -10.0f * (t - 1.0f)) + 2.0f); |
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342 | } |
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343 | } |
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344 | } |
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345 | }; |
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346 | |
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347 | class Motion : public osg::Referenced |
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348 | { |
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349 | public: |
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350 | typedef float value_type; |
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351 | enum TimeBehaviour |
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352 | { |
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353 | CLAMP, |
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354 | LOOP |
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355 | }; |
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356 | Motion(float startValue = 0, float duration = 1, float changeValue = 1, TimeBehaviour tb = CLAMP) : _time(0), _startValue(startValue), _changeValue(changeValue), _duration(duration), _behaviour(tb) {} |
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357 | virtual ~Motion() {} |
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358 | void reset() { setTime(0);} |
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359 | float getTime() const { return _time; } |
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360 | float evaluateTime(float time) const |
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361 | { |
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362 | switch (_behaviour) |
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363 | { |
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364 | case CLAMP: |
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365 | if (time > _duration) |
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366 | time = _duration; |
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367 | else if (time < 0.0) |
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368 | time = 0.0; |
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369 | break; |
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370 | case LOOP: |
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371 | if (time <= 0) |
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372 | time = 0; |
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373 | else |
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374 | time = fmodf(time, _duration); |
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375 | break; |
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376 | } |
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377 | return time; |
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378 | } |
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379 | |
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380 | void update(float dt) |
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381 | { |
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382 | _time = evaluateTime(_time + dt); |
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383 | } |
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384 | |
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385 | void setTime(float time) { _time = evaluateTime(time);} |
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386 | void getValue(value_type& result) const { getValueAt(_time, result); } |
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387 | value_type getValue() const |
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388 | { |
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389 | value_type result; |
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390 | getValueAt(_time, result); |
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391 | return result; |
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392 | } |
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393 | |
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394 | void getValueAt(float time, value_type& result) const |
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395 | { |
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396 | getValueInNormalizedRange(evaluateTime(time)/_duration, result); |
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397 | result = result * _changeValue + _startValue; |
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398 | } |
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399 | value_type getValueAt(float time) const |
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400 | { |
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401 | value_type result; |
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402 | getValueAt(evaluateTime(time), result); |
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403 | return result; |
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404 | } |
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405 | |
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406 | virtual void getValueInNormalizedRange(float t, value_type& result) const = 0; |
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407 | |
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408 | float getDuration() const { return _duration;} |
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409 | protected: |
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410 | float _time; |
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411 | float _startValue; |
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412 | float _changeValue; |
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413 | float _duration; |
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414 | TimeBehaviour _behaviour; |
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415 | }; |
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416 | |
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417 | |
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418 | |
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419 | template <typename T> |
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420 | struct MathMotionTemplate : public Motion |
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421 | { |
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422 | MathMotionTemplate(float startValue = 0, float duration = 1, float changeValue = 1, TimeBehaviour tb = CLAMP) : Motion(startValue, duration, changeValue, tb) {} |
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423 | virtual void getValueInNormalizedRange(float t, value_type& result) const { T::getValueAt(t, result); } |
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424 | }; |
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425 | |
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426 | template <class T> |
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427 | struct SamplerMotionTemplate : public Motion |
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428 | { |
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429 | T _sampler; |
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430 | SamplerMotionTemplate(float startValue = 0, float duration = 1, float changeValue = 1, TimeBehaviour tb = CLAMP) : Motion(startValue, duration, changeValue, tb) {} |
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431 | T& getSampler() { return _sampler;} |
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432 | const T& getSampler() const { return _sampler;} |
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433 | virtual void getValueInNormalizedRange(float t, value_type& result) const |
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434 | { |
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435 | if (!_sampler.getKeyframeContainer()) |
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436 | { |
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437 | result = 0; |
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438 | return; |
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439 | } |
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440 | float size = _sampler.getEndTime() - _sampler.getStartTime(); |
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441 | t = t * size + _sampler.getStartTime(); |
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442 | _sampler.getValueAt(t, result); |
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443 | } |
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444 | }; |
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445 | |
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446 | struct CompositeMotion : public Motion |
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447 | { |
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448 | typedef std::vector<osg::ref_ptr<Motion> > MotionList; |
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449 | MotionList _motions; |
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450 | |
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451 | MotionList& getMotionList() { return _motions; } |
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452 | const MotionList& getMotionList() const { return _motions; } |
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453 | CompositeMotion(float startValue = 0, float duration = 1, float changeValue = 1, TimeBehaviour tb = CLAMP) : Motion(startValue, duration, changeValue, tb) {} |
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454 | |
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455 | virtual void getValueInNormalizedRange(float t, value_type& result) const |
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456 | { |
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457 | if (_motions.empty()) |
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458 | { |
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459 | result = 0; |
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460 | osg::notify(osg::WARN) << "CompositeMotion::getValueInNormalizedRange no Motion in the CompositeMotion, add motion to have result" << std::endl; |
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461 | return; |
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462 | } |
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463 | for (MotionList::const_iterator it = _motions.begin(); it != _motions.end(); ++it) |
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464 | { |
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465 | const Motion* motion = static_cast<const Motion*>(it->get()); |
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466 | float durationInRange = motion->getDuration() / getDuration(); |
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467 | if (t < durationInRange) |
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468 | { |
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469 | float tInRange = t/durationInRange * motion->getDuration(); |
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470 | motion->getValueAt( tInRange, result); |
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471 | return; |
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472 | } else |
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473 | t = t - durationInRange; |
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474 | } |
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475 | osg::notify(osg::WARN) << "CompositeMotion::getValueInNormalizedRange did find the value in range, something wrong" << std::endl; |
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476 | result = 0; |
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477 | } |
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478 | }; |
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479 | |
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480 | |
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481 | // linear |
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482 | typedef MathMotionTemplate<LinearFunction > LinearMotion; |
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483 | |
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484 | // quad |
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485 | typedef MathMotionTemplate<OutQuadFunction > OutQuadMotion; |
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486 | typedef MathMotionTemplate<InQuadFunction> InQuadMotion; |
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487 | typedef MathMotionTemplate<InOutQuadFunction> InOutQuadMotion; |
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488 | |
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489 | // cubic |
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490 | typedef MathMotionTemplate<OutCubicFunction > OutCubicMotion; |
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491 | typedef MathMotionTemplate<InCubicFunction> InCubicMotion; |
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492 | typedef MathMotionTemplate<InOutCubicFunction> InOutCubicMotion; |
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493 | |
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494 | // quart |
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495 | typedef MathMotionTemplate<OutQuartFunction > OutQuartMotion; |
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496 | typedef MathMotionTemplate<InQuartFunction> InQuartMotion; |
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497 | typedef MathMotionTemplate<InOutQuartFunction> InOutQuartMotion; |
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498 | |
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499 | // bounce |
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500 | typedef MathMotionTemplate<OutBounceFunction > OutBounceMotion; |
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501 | typedef MathMotionTemplate<InBounceFunction> InBounceMotion; |
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502 | typedef MathMotionTemplate<InOutBounceFunction> InOutBounceMotion; |
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503 | |
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504 | // elastic |
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505 | typedef MathMotionTemplate<OutElasticFunction > OutElasticMotion; |
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506 | typedef MathMotionTemplate<InElasticFunction > InElasticMotion; |
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507 | typedef MathMotionTemplate<InOutElasticFunction > InOutElasticMotion; |
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508 | |
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509 | // sine |
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510 | typedef MathMotionTemplate<OutSineFunction > OutSineMotion; |
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511 | typedef MathMotionTemplate<InSineFunction > InSineMotion; |
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512 | typedef MathMotionTemplate<InOutSineFunction > InOutSineMotion; |
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513 | |
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514 | // back |
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515 | typedef MathMotionTemplate<OutBackFunction > OutBackMotion; |
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516 | typedef MathMotionTemplate<InBackFunction > InBackMotion; |
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517 | typedef MathMotionTemplate<InOutBackFunction > InOutBackMotion; |
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518 | |
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519 | // circ |
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520 | typedef MathMotionTemplate<OutCircFunction > OutCircMotion; |
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521 | typedef MathMotionTemplate<InCircFunction > InCircMotion; |
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522 | typedef MathMotionTemplate<InOutCircFunction > InOutCircMotion; |
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523 | |
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524 | // expo |
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525 | typedef MathMotionTemplate<OutExpoFunction > OutExpoMotion; |
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526 | typedef MathMotionTemplate<InExpoFunction > InExpoMotion; |
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527 | typedef MathMotionTemplate<InOutExpoFunction > InOutExpoMotion; |
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528 | } |
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529 | |
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530 | #endif |
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