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6 |
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7 | var AnimationUtils = {
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8 |
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9 |
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10 | arraySlice: function ( array, from, to ) {
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11 |
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12 | if ( AnimationUtils.isTypedArray( array ) ) {
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13 |
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14 |
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15 |
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16 | return new array.constructor( array.subarray( from, to !== undefined ? to : array.length ) );
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17 |
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18 | }
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19 |
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20 | return array.slice( from, to );
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21 |
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22 | },
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23 |
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24 |
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25 | convertArray: function ( array, type, forceClone ) {
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26 |
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27 | if ( ! array ||
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28 | ! forceClone && array.constructor === type ) return array;
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29 |
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30 | if ( typeof type.BYTES_PER_ELEMENT === 'number' ) {
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31 |
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32 | return new type( array );
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33 |
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34 | }
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35 |
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36 | return Array.prototype.slice.call( array );
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37 |
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38 | },
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39 |
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40 | isTypedArray: function ( object ) {
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41 |
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42 | return ArrayBuffer.isView( object ) &&
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43 | ! ( object instanceof DataView );
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44 |
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45 | },
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46 |
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47 |
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48 | getKeyframeOrder: function ( times ) {
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49 |
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50 | function compareTime( i, j ) {
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51 |
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52 | return times[ i ] - times[ j ];
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53 |
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54 | }
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55 |
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56 | var n = times.length;
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57 | var result = new Array( n );
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58 | for ( var i = 0; i !== n; ++ i ) result[ i ] = i;
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59 |
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60 | result.sort( compareTime );
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61 |
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62 | return result;
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63 |
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64 | },
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65 |
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66 |
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67 | sortedArray: function ( values, stride, order ) {
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68 |
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69 | var nValues = values.length;
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70 | var result = new values.constructor( nValues );
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71 |
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72 | for ( var i = 0, dstOffset = 0; dstOffset !== nValues; ++ i ) {
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73 |
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74 | var srcOffset = order[ i ] * stride;
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75 |
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76 | for ( var j = 0; j !== stride; ++ j ) {
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77 |
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78 | result[ dstOffset ++ ] = values[ srcOffset + j ];
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79 |
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80 | }
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81 |
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82 | }
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83 |
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84 | return result;
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85 |
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86 | },
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87 |
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88 |
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89 | flattenJSON: function ( jsonKeys, times, values, valuePropertyName ) {
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90 |
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91 | var i = 1, key = jsonKeys[ 0 ];
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92 |
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93 | while ( key !== undefined && key[ valuePropertyName ] === undefined ) {
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94 |
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95 | key = jsonKeys[ i ++ ];
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96 |
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97 | }
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98 |
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99 | if ( key === undefined ) return;
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100 |
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101 | var value = key[ valuePropertyName ];
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102 | if ( value === undefined ) return;
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103 |
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104 | if ( Array.isArray( value ) ) {
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105 |
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106 | do {
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107 |
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108 | value = key[ valuePropertyName ];
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109 |
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110 | if ( value !== undefined ) {
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111 |
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112 | times.push( key.time );
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113 | values.push.apply( values, value );
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114 |
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115 | }
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116 |
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117 | key = jsonKeys[ i ++ ];
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118 |
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119 | } while ( key !== undefined );
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120 |
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121 | } else if ( value.toArray !== undefined ) {
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122 |
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123 |
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124 |
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125 | do {
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126 |
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127 | value = key[ valuePropertyName ];
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128 |
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129 | if ( value !== undefined ) {
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130 |
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131 | times.push( key.time );
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132 | value.toArray( values, values.length );
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133 |
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134 | }
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135 |
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136 | key = jsonKeys[ i ++ ];
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137 |
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138 | } while ( key !== undefined );
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139 |
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140 | } else {
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141 |
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142 |
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143 |
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144 | do {
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145 |
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146 | value = key[ valuePropertyName ];
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147 |
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148 | if ( value !== undefined ) {
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149 |
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150 | times.push( key.time );
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151 | values.push( value );
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152 |
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153 | }
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154 |
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155 | key = jsonKeys[ i ++ ];
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156 |
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157 | } while ( key !== undefined );
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158 |
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159 | }
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160 |
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161 | }
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162 |
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163 | };
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164 |
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165 |
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166 | export { AnimationUtils };
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