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0001 // Copyright (C) 2010, Guy Barrand. All rights reserved.
0002 // See the file tools.license for terms.
0003
0004 #ifndef tools_sg_perspective
0005 #define tools_sg_perspective
0006
0007 #include "base_camera"
0008
0009 #include "../mathf"
0010
0011 namespace tools {
0012 namespace sg {
0013
0014 class perspective : public base_camera {
0015   TOOLS_NODE(perspective,tools::sg::perspective,base_camera)
0016 public:
0017   virtual float near_height() const {
0018     return 2.0f*znear.value()*ftan(height_angle.value()*0.5f);
0019   }
0020   virtual void zoom(float a_fac) {
0021     //for exa :
0022     //  a_fac = 0.99f is a zoom in
0023     //  a_fac = 1.01f is a zoom out
0024     height_angle.value(height_angle.value()*a_fac);
0025   }
0026   virtual camera_type type() const {return camera_perspective;}
0027 public:
0028   sf<float> height_angle;
0029 public:
0030   virtual const desc_fields& node_desc_fields() const {
0031     TOOLS_FIELD_DESC_NODE_CLASS(tools::sg::perspective)
0032     static const desc_fields s_v(parent::node_desc_fields(),1, //WARNING : take care of count.
0033       TOOLS_ARG_FIELD_DESC(height_angle)
0034     );
0035     return s_v;
0036   }
0037 private:
0038   void add_fields(){
0039     add_field(&height_angle);
0040   }
0041 public:
0042   perspective()
0043   :parent()
0044   ,height_angle(fpi()/4.0f) //45 degrees.
0045   {
0046     add_fields();
0047   }
0048   virtual ~perspective(){
0049   }
0050 public:
0051   perspective(const perspective& a_from)
0052   :parent(a_from)
0053   ,height_angle(a_from.height_angle)
0054   {
0055     add_fields();
0056   }
0057   perspective& operator=(const perspective& a_from){
0058     parent::operator=(a_from);
0059     height_angle = a_from.height_angle;
0060     return *this;
0061   }
0062 public: //operators:
0063   bool operator==(const perspective& a_from) const{
0064     if(!parent::operator==(a_from)) return false;
0065     if(height_angle!=a_from.height_angle) return false;
0066     return true;
0067   }
0068   bool operator!=(const perspective& a_from) const {
0069     return !operator==(a_from);
0070   }
0071 public:
0072   void dump(std::ostream& a_out) {
0073     parent::dump(a_out);
0074     a_out << " height_angle " << height_angle.value() << std::endl;
0075   }
0076
0077 protected:
0078   virtual void get_lrbt(unsigned int a_ww,unsigned int a_wh,
0079                         float& a_l,float& a_r,float& a_b,float& a_t) {
0080     float aspect = float(a_ww)/float(a_wh);
0081     float hh = near_height()*0.5f;
0082     a_l = -aspect*hh;
0083     a_r = aspect*hh;
0084     a_b = -hh;
0085     a_t = hh;
0086   }
0087 };
0088
0089 inline perspective* cast_perspective(base_camera& a_bcam) {return safe_cast<base_camera,perspective>(a_bcam);}
0090
0091 }}
0092
0093 #endif