text_hershey_marker

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// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.
 
#ifndef tools_sg_text_hershey_marker
#define tools_sg_text_hershey_marker
 
#include "text_hershey"
 
namespace tools {
namespace sg {
 
class text_hershey_marker : public text_hershey {
  TOOLS_NODE(text_hershey_marker,tools::sg::text_hershey_marker,text_hershey)
public:
  virtual bool draw_in_frame_buffer() const {return true;}
 
  virtual void render(render_action& a_action) {
    //Same logic as Inventor SoLightModel.model = BASE_COLOR.
    a_action.set_lighting(false);
    a_action.set_depth_test(false);
 
    float x,y,z;
    a_action.projected_origin(x,y,z);
 
    const state& state = a_action.state();
 
    float sy = 2.0f*float(height.value())/float(state.m_wh); //in [-1,1]
 
    float old_height = height.value();
    height.value_no_cmp(sy);
 
    std::vector<float> segs;
    get_segments(segs); //must be after changing the height.
 
    a_action.load_matrices_to_identity();
 
   {std::vector<float>::iterator it;
    for(it=segs.begin();it!=segs.end();) {
       *it += x;it++; //Android don't like *it++.
       *it += y;it++;
    }}
    a_action.draw_vertex_array_xy(gl::lines(),segs);
 
    a_action.load_matrices_from_state();
 
    height.value_no_cmp(old_height);
 
    a_action.set_depth_test(state.m_GL_DEPTH_TEST);
    a_action.set_lighting(a_action.state().m_GL_LIGHTING);
 
  }
 
  virtual void pick(pick_action& a_action) {
    float x,y,z;
    a_action.projected_origin(x,y,z);
 
    const state& state = a_action.state();
 
    float sy = 2.0f*float(height.value())/float(state.m_wh); //in [-1,1]
 
    float old_height = height.value();
    height.value_no_cmp(sy);
 
    std::vector<float> segs;
    get_segments(segs);
 
    a_action.set_matrices_to_identity();
 
   {std::vector<float>::iterator it;
    for(it=segs.begin();it!=segs.end();) {
       *it += x;it++;
       *it += y;it++;
    }}
 
    a_action.add__lines_xy(*this,segs);
 
    a_action.set_matrices_from_state();
 
    height.value_no_cmp(old_height);
  }
 
  virtual void bbox(bbox_action& a_action) {
    a_action.add_one_point(0,0,0);
  }
public:
  text_hershey_marker()
  :parent()
  {
    height = 10; //in pixels
  }
  virtual ~text_hershey_marker(){}
public:
  text_hershey_marker(const text_hershey_marker& a_from)
  :parent(a_from)
  {}
  text_hershey_marker& operator=(const text_hershey_marker& a_from){
    parent::operator=(a_from);
    return *this;
  }
};
 
}}
 
#endif