| Geant4 Cross Reference |
1 // Copyright (C) 2010, Guy Barrand. All rights reserved.
2 // See the file tools.license for terms.
3
4 #ifndef tools_sg_perspective
5 #define tools_sg_perspective
6
7 #include "base_camera"
8
9 #include "../mathf"
10
11 namespace tools {
12 namespace sg {
13
14 class perspective : public base_camera {
15 TOOLS_NODE(perspective,tools::sg::perspective,base_camera)
16 public:
17 virtual float near_height() const {
18 return 2.0f*znear.value()*ftan(height_angle.value()*0.5f);
19 }
20 virtual void zoom(float a_fac) {
21 //for exa :
22 // a_fac = 0.99f is a zoom in
23 // a_fac = 1.01f is a zoom out
24 height_angle.value(height_angle.value()*a_fac);
25 }
26 virtual camera_type type() const {return camera_perspective;}
27 public:
28 sf<float> height_angle;
29 public:
30 virtual const desc_fields& node_desc_fields() const {
31 TOOLS_FIELD_DESC_NODE_CLASS(tools::sg::perspective)
32 static const desc_fields s_v(parent::node_desc_fields(),1, //WARNING : take care of count.
33 TOOLS_ARG_FIELD_DESC(height_angle)
34 );
35 return s_v;
36 }
37 private:
38 void add_fields(){
39 add_field(&height_angle);
40 }
41 public:
42 perspective()
43 :parent()
44 ,height_angle(fpi()/4.0f) //45 degrees.
45 {
46 #ifdef TOOLS_MEM
47 mem::increment(s_class().c_str());
48 #endif
49 add_fields();
50 }
51 virtual ~perspective(){
52 #ifdef TOOLS_MEM
53 mem::decrement(s_class().c_str());
54 #endif
55 }
56 public:
57 perspective(const perspective& a_from)
58 :parent(a_from)
59 ,height_angle(a_from.height_angle)
60 {
61 #ifdef TOOLS_MEM
62 mem::increment(s_class().c_str());
63 #endif
64 add_fields();
65 }
66 perspective& operator=(const perspective& a_from){
67 parent::operator=(a_from);
68 height_angle = a_from.height_angle;
69 return *this;
70 }
71 public: //operators:
72 bool operator==(const perspective& a_from) const{
73 if(!parent::operator==(a_from)) return false;
74 if(height_angle!=a_from.height_angle) return false;
75 return true;
76 }
77 bool operator!=(const perspective& a_from) const {
78 return !operator==(a_from);
79 }
80 public:
81 void dump(std::ostream& a_out) {
82 parent::dump(a_out);
83 a_out << " height_angle " << height_angle.value() << std::endl;
84 }
85
86 protected:
87 virtual void get_lrbt(unsigned int a_ww,unsigned int a_wh,
88 float& a_l,float& a_r,float& a_b,float& a_t) {
89 float aspect = float(a_ww)/float(a_wh);
90 float hh = near_height()*0.5f;
91 a_l = -aspect*hh;
92 a_r = aspect*hh;
93 a_b = -hh;
94 a_t = hh;
95 }
96 };
97
98 inline perspective* cast_perspective(base_camera& a_bcam) {return safe_cast<base_camera,perspective>(a_bcam);}
99
100 }}
101
102 #endif