source/text.cpp

   1 #include <msp/gl/immediate.h>
   2 #include <msp/gl/matrix.h>
   3 #include "style.h"
   4 #include "text.h"
   5
   6 using namespace std;
   7
   8 namespace Msp {
   9 namespace GLtk {
  10
  11 Text::Text(const Style *const &s):
  12         style(s)
  13 { }
  14
  15 Text::Text(const Style *const &s, const string &t):
  16         style(s)
  17 {
  18         set(t);
  19 }
  20
  21 unsigned Text::get_width() const
  22 {
  23         unsigned width=0;
  24         for(vector<Line>::const_iterator i=lines.begin(); i!=lines.end(); ++i)
  25                 width=max(width, i->width);
  26         return width;
  27 }
  28
  29 unsigned Text::get_height() const
  30 {
  31         const GL::Font *font=style->get_font();
  32         float font_size=font->get_default_size();
  33         unsigned line_height=static_cast<unsigned>((font->get_ascent()-font->get_descent())*font_size);
  34         unsigned line_spacing=line_height*6/5;
  35         return line_height+(lines.size()-1)*line_spacing;
  36 }
  37
  38 void Text::set(const string &t)
  39 {
  40         text=t;
  41         lines.clear();
  42         float font_size=style->get_font()->get_default_size();
  43         unsigned start=0;
  44         while(1)
  45         {
  46                 unsigned newline=text.find('\n', start);
  47
  48                 Line line;
  49                 line.start=start;
  50                 line.length=(newline==string::npos ? text.size() : newline)-start;
  51                 line.width=static_cast<unsigned>(style->get_font()->get_string_width(text.substr(line.start, line.length))*font_size);
  52                 lines.push_back(line);
  53
  54                 if(newline==string::npos)
  55                         break;
  56                 start=newline+1;
  57         }
  58 }
  59
  60 void Text::erase(unsigned pos, unsigned len)
  61 {
  62         text.erase(pos, len);
  63 }
  64
  65 void Text::insert(unsigned pos, const string &s)
  66 {
  67         text.insert(pos, s);
  68 }
  69
  70 void Text::render(const Part &part, const Geometry &geom) const
  71 {
  72         if(lines.empty())
  73                 return;
  74
  75         const GL::Font *font=style->get_font();
  76         float font_size=font->get_default_size();
  77         unsigned line_height=static_cast<unsigned>((font->get_ascent()-font->get_descent())*font_size);
  78         unsigned line_spacing=font_size*6/5;
  79         unsigned height=line_height+(lines.size()-1)*line_spacing;
  80         int y_offset=static_cast<int>(-font->get_descent()*font_size);
  81
  82         const GL::Color &color=style->get_font_color();
  83         GL::Immediate imm((GL::COLOR4_UBYTE, GL::TEXCOORD2, GL::VERTEX2));
  84         imm.color(color.r, color.g, color.b);
  85         for(unsigned i=0; i<lines.size(); ++i)
  86         {
  87                 const Line &line=lines[i];
  88
  89                 Geometry rgeom;
  90                 rgeom.w=line.width;
  91                 rgeom.h=height;
  92                 rgeom.y=(lines.size()-1-i)*line_spacing+y_offset;
  93                 part.get_alignment().apply(rgeom, geom, part.get_margin());
  94
  95                 GL::push_matrix();
  96                 GL::translate(rgeom.x, rgeom.y, 0);
  97                 GL::scale_uniform(font_size);
  98
  99                 font->draw_string(text.substr(line.start, line.length), imm);
 100
 101                 GL::pop_matrix();
 102         }
 103 }
 104
 105 Text &Text::operator=(const string &t)
 106 {
 107         set(t);
 108         return *this;
 109 }
 110
 111 } // namespace GLtk
 112 } // namespace Msp