00001 // GMTL is (C) Copyright 2001-2010 by Allen Bierbaum 00002 // Distributed under the GNU Lesser General Public License 2.1 with an 00003 // addendum covering inlined code. (See accompanying files LICENSE and 00004 // LICENSE.addendum or http://www.gnu.org/copyleft/lesser.txt) 00005 00006 #ifndef _GMTL_OOBox_H_ 00007 #define _GMTL_OOBox_H_ 00008 00009 #include <gmtl/Vec3.h> 00010 #include <gmtl/Point3.h> 00011 #include <gmtl/matVecFuncs.h> 00012 00013 namespace gmtl 00014 { 00015 00016 // AABox : Defines an object aligned box 00017 // 00018 // For definition of an OOB, see pg 293-294 of Real-Time Rendering 00019 class OOBox 00020 { 00021 00022 public: 00023 OOBox() 00024 { ident(); } 00025 00026 OOBox(OOBox& box); 00027 00028 public: 00029 // Accessors 00030 Point3& center(); 00031 const Point3& center() const; 00032 00033 Vec3& axis (int i); 00034 const Vec3& axis (int i) const; 00035 Vec3* axes (); 00036 const Vec3* axes () const; 00037 00038 float& halfLen(int i); 00039 const float& halfLen(int i) const; 00040 float* halfLens(); 00041 const float* halfLens() const; 00042 00043 // Assignment 00044 OOBox& operator=(const OOBox& box); 00045 00046 // Comparison 00047 bool operator==(const OOBox& box) const; 00048 00049 // return the verts that define the box 00050 // Order: XYZ: 000, 100, 110, 010, 00051 // 001, 101, 111, 011 00052 void getVerts(Point3 verts[8]) const; 00053 00054 // Merge current box with other box to get new box covering both 00055 void mergeWith(const OOBox& box); 00056 00057 void ident() 00058 { 00059 mCenter = ZeroVec3; 00060 mAxis[0] = XUnitVec3; 00061 mAxis[1] = YUnitVec3; 00062 mAxis[2] = ZUnitVec3; 00063 mHalfLen[0] = mHalfLen[1] = mHalfLen[2] = 0.0f; 00064 } 00065 00066 public: 00067 Point3 mCenter; // The center point of the box 00068 Vec3 mAxis[3]; // The axes of the oriented box (xAxis, yAxis, zAxis) 00069 float mHalfLen[3]; // Half lengths of the box ASSERT: HalfLens >= 0.0f 00070 }; 00071 00072 00073 // ------------------------------------------------- // 00074 // --------------- Member definitions -------------- // 00075 // ------------------------------------------------- // 00076 inline 00077 OOBox::OOBox(OOBox& box) 00078 { 00079 mCenter = box.mCenter; 00080 mAxis[0] = box.mAxis[0]; 00081 mAxis[1] = box.mAxis[1]; 00082 mAxis[2] = box.mAxis[2]; 00083 mHalfLen[0] = box.mHalfLen[0]; 00084 mHalfLen[1] = box.mHalfLen[1]; 00085 mHalfLen[2] = box.mHalfLen[2]; 00086 } 00087 00088 // Accessors 00089 inline Point3& OOBox::center() 00090 { 00091 return mCenter; 00092 } 00093 00094 inline const Point3& OOBox::center() const 00095 { 00096 return mCenter; 00097 } 00098 00099 inline Vec3& OOBox::axis (int i) 00100 { 00101 return mAxis[i]; 00102 } 00103 00104 inline const Vec3& OOBox::axis (int i) const 00105 { 00106 return mAxis[i]; 00107 } 00108 00109 inline Vec3* OOBox::axes () 00110 { 00111 return mAxis; 00112 } 00113 00114 inline const Vec3* OOBox::axes () const 00115 { 00116 return mAxis; 00117 } 00118 00119 inline float& OOBox::halfLen(int i) 00120 { 00121 return mHalfLen[i]; 00122 } 00123 00124 inline const float& OOBox::halfLen(int i) const 00125 { 00126 return mHalfLen[i]; 00127 } 00128 00129 inline float* OOBox::halfLens() 00130 { 00131 return mHalfLen; 00132 } 00133 00134 inline const float* OOBox::halfLens() const 00135 { 00136 return mHalfLen; 00137 } 00138 00139 // Assignment 00140 inline OOBox& OOBox::operator=(const OOBox& box) 00141 { 00142 mCenter = box.mCenter; 00143 mAxis[0] = box.mAxis[0]; 00144 mAxis[1] = box.mAxis[1]; 00145 mAxis[2] = box.mAxis[2]; 00146 mHalfLen[0] = box.mHalfLen[0]; 00147 mHalfLen[1] = box.mHalfLen[1]; 00148 mHalfLen[2] = box.mHalfLen[2]; 00149 return *this; 00150 } 00151 00152 // Comparison 00153 inline bool OOBox::operator==(const OOBox& box) const 00154 { 00155 return ((mCenter == box.mCenter) && 00156 (mAxis[0] == box.mAxis[0]) && 00157 (mAxis[1] == box.mAxis[1]) && 00158 (mAxis[2] == box.mAxis[2]) && 00159 (mHalfLen[0] == box.mHalfLen[0]) && 00160 (mHalfLen[1] == box.mHalfLen[1]) && 00161 (mHalfLen[2] == box.mHalfLen[2])); 00162 } 00163 00164 inline void OOBox::getVerts(Point3 verts[8]) const 00165 { 00166 Vec3 x_half_axis = mAxis[0]*mHalfLen[0]; 00167 Vec3 y_half_axis = mAxis[1]*mHalfLen[1]; 00168 Vec3 z_half_axis = mAxis[2]*mHalfLen[2]; 00169 00170 verts[0] = mCenter - x_half_axis - y_half_axis - z_half_axis; 00171 verts[1] = mCenter + x_half_axis - y_half_axis - z_half_axis; 00172 verts[2] = mCenter + x_half_axis + y_half_axis - z_half_axis; 00173 verts[3] = mCenter - x_half_axis + y_half_axis - z_half_axis; 00174 verts[4] = mCenter - x_half_axis - y_half_axis + z_half_axis; 00175 verts[5] = mCenter + x_half_axis - y_half_axis + z_half_axis; 00176 verts[6] = mCenter + x_half_axis + y_half_axis + z_half_axis; 00177 verts[7] = mCenter - x_half_axis + y_half_axis + z_half_axis; 00178 } 00179 00180 }; 00181 00182 #endif
1.7.1