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15 | #include <osgManipulator/AntiSquish> |
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16 | |
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17 | using namespace osgManipulator; |
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18 | |
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19 | namespace |
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20 | { |
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21 | class AntiSquishCallback: public osg::NodeCallback |
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22 | { |
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23 | public: |
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24 | AntiSquishCallback(AntiSquish* asq) : osg::NodeCallback(), _antiSquish(asq) {} |
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25 | virtual ~AntiSquishCallback() {}; |
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26 | |
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27 | virtual void operator() (osg::Node* node, osg::NodeVisitor* nv) |
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28 | { |
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29 | |
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30 | osg::NodePath np = nv->getNodePath(); |
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31 | |
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32 | |
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33 | np.pop_back(); |
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34 | |
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35 | |
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36 | osg::Matrix localToWorld = osg::computeLocalToWorld(np); |
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37 | |
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38 | |
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39 | bool flag = false; |
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40 | osg::Matrix _unsquishedMatrix = _antiSquish->computeUnSquishedMatrix(localToWorld, flag); |
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41 | if (flag) |
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42 | _antiSquish->setMatrix(_unsquishedMatrix); |
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43 | traverse(node,nv); |
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44 | } |
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45 | |
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46 | protected: |
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47 | AntiSquish* _antiSquish; |
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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 | AntiSquish::AntiSquish() : _usePivot(true), _usePosition(false) |
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53 | { |
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54 | _asqCallback = new AntiSquishCallback(this); |
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55 | setUpdateCallback(_asqCallback); |
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56 | } |
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57 | |
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58 | AntiSquish::AntiSquish(const osg::Vec3d& pivot) : _pivot(pivot), _usePivot(true), _usePosition(false) |
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59 | { |
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60 | _asqCallback = new AntiSquishCallback(this); |
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61 | setUpdateCallback(_asqCallback); |
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62 | } |
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63 | |
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64 | AntiSquish::AntiSquish(const osg::Vec3d& pivot, const osg::Vec3d& pos) |
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65 | : _pivot(pivot), _usePivot(true), _position(pos), _usePosition(true) |
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66 | { |
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67 | _asqCallback = new AntiSquishCallback(this); |
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68 | setUpdateCallback(_asqCallback); |
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69 | } |
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70 | |
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71 | |
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72 | AntiSquish::AntiSquish(const AntiSquish& pat,const osg::CopyOp& copyop) : |
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73 | MatrixTransform(pat,copyop), |
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74 | _asqCallback(pat._asqCallback), |
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75 | _pivot(pat._pivot), |
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76 | _usePivot(pat._usePivot), |
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77 | _position(pat._position), |
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78 | _usePosition(pat._usePosition), |
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79 | _cachedLocalToWorld(pat._cachedLocalToWorld) |
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80 | { |
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81 | } |
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82 | |
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83 | AntiSquish::~AntiSquish() |
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84 | { |
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85 | } |
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86 | |
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87 | osg::Matrix AntiSquish::computeUnSquishedMatrix(const osg::Matrix& LTW, bool& flag) |
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88 | { |
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89 | osg::Vec3d t, s; |
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90 | osg::Quat r, so; |
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91 | |
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92 | if (LTW == _cachedLocalToWorld && _dirty == false) |
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93 | { |
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94 | flag = false; |
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95 | return osg::Matrix::identity(); |
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96 | } |
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97 | |
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98 | _cachedLocalToWorld = LTW; |
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99 | |
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100 | LTW.decompose(t, r, s, so); |
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101 | |
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102 | |
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103 | double av = (s[0] + s[1] + s[2])/3.0; |
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104 | s[0] = av; s[1] = av; s[2]=av; |
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105 | |
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106 | if (av == 0) |
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107 | { |
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108 | flag = false; |
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109 | return osg::Matrix::identity(); |
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110 | } |
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111 | |
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112 | osg::Matrix unsquished; |
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113 | |
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114 | |
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115 | |
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116 | |
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117 | |
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118 | if (_usePivot) |
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119 | { |
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120 | unsquished.postMultTranslate(-_pivot); |
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121 | |
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122 | osg::Matrix tmps, invtmps; |
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123 | so.get(tmps); |
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124 | if (!invtmps.invert(tmps)) |
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125 | { |
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126 | flag = false; |
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127 | return osg::Matrix::identity(); |
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128 | } |
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129 | |
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130 | |
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131 | unsquished.postMult(invtmps); |
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132 | |
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133 | unsquished.postMultScale(s); |
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134 | |
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135 | unsquished.postMult(tmps); |
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136 | |
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137 | unsquished.postMultRotate(r); |
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138 | |
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139 | unsquished.postMultTranslate(t); |
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140 | |
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141 | osg::Matrix invltw; |
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142 | if (!invltw.invert(LTW)) |
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143 | { |
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144 | flag = false; |
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145 | return osg::Matrix::identity(); |
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146 | } |
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147 | |
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148 | unsquished.postMult( invltw ); |
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149 | |
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150 | |
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151 | if (_usePosition) |
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152 | unsquished.postMultTranslate(_position); |
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153 | else |
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154 | unsquished.postMultTranslate(_pivot); |
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155 | } |
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156 | else |
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157 | { |
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158 | osg::Matrix tmps, invtmps; |
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159 | so.get(tmps); |
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160 | if (!invtmps.invert(tmps)) |
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161 | { |
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162 | flag = false; |
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163 | return osg::Matrix::identity(); |
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164 | } |
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165 | unsquished.postMult(invtmps); |
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166 | unsquished.postMultScale(s); |
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167 | unsquished.postMult(tmps); |
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168 | unsquished.postMultRotate(r); |
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169 | unsquished.postMultTranslate(t); |
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170 | osg::Matrix invltw; |
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171 | if (!invltw.invert(LTW)) |
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172 | { |
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173 | flag = false; |
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174 | return osg::Matrix::identity(); |
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175 | } |
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176 | unsquished.postMult( invltw ); |
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177 | } |
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178 | |
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179 | if (unsquished.isNaN()) |
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180 | { |
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181 | flag = false; |
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182 | return osg::Matrix::identity(); |
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183 | } |
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184 | |
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185 | flag = true; |
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186 | _dirty = false; |
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187 | return unsquished; |
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188 | } |
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189 | |
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190 | |
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