src/view.cpp

   1 #include "view.h"
   2
   3 #include "SDL_opengl.h"
   4
   5 using namespace IPDF;
   6 using namespace std;
   7
   8 void View::Translate(Real x, Real y)
   9 {
  10         x *= m_bounds.w;
  11         y *= m_bounds.h;
  12         m_bounds.x += x;
  13         m_bounds.y += y;
  14 }
  15
  16 void View::ScaleAroundPoint(Real x, Real y, Real scaleAmt)
  17 {
  18         // Convert to local coords.
  19         x *= m_bounds.w;
  20         y *= m_bounds.h;
  21         x += m_bounds.x;
  22         y += m_bounds.y;
  23
  24         Debug("Mouse wheel event %f %f %f\n", Float(x), Float(y), Float(scaleAmt));
  25
  26         Real top = y - m_bounds.y;
  27         Real left = x - m_bounds.x;
  28
  29         top *= scaleAmt;
  30         left *= scaleAmt;
  31
  32         m_bounds.x = x - left;
  33         m_bounds.y = y - top;
  34         m_bounds.w *= scaleAmt;
  35         m_bounds.h *= scaleAmt;
  36 }
  37
  38 Rect View::TransformToViewCoords(const Rect& inp) const
  39 {
  40         Rect out;
  41         out.x = (inp.x - m_bounds.x) / m_bounds.w;
  42         out.y = (inp.y - m_bounds.y) / m_bounds.h;
  43
  44         out.w = inp.w / m_bounds.w;
  45         out.h = inp.h / m_bounds.h;
  46         return out;
  47 }
  48
  49 void View::DrawGrid()
  50 {
  51         // Draw some grid lines at fixed pixel positions
  52         glMatrixMode(GL_PROJECTION);
  53         glLoadIdentity();
  54         glOrtho(0.0, 1.0, 1.0, 0.0, -1.f, 1.f);
  55         glMatrixMode(GL_MODELVIEW);
  56         glLoadIdentity();
  57
  58         glColor4f(0.9,0.9,0.9,0.1);
  59         const float num_lines = 50.0;
  60         for (float i = 0; i < num_lines; ++i)
  61         {
  62                 glBegin(GL_LINES);
  63                 glVertex2f(i*(1.0/num_lines), 0.0);
  64                 glVertex2f(i*(1.0/num_lines), 1.0);
  65                 glEnd();
  66                 glBegin(GL_LINES);
  67                 glVertex2f(0.0,i*(1.0/num_lines));
  68                 glVertex2f(1.0,i*(1.0/num_lines));
  69                 glEnd();
  70
  71         }
  72 }
  73
  74 void View::Render()
  75 {
  76         static bool debug_output_done = false;
  77         if (!debug_output_done)
  78         {
  79                 m_document.DebugDumpObjects();
  80                 debug_output_done = true;
  81         }
  82
  83
  84         //DrawGrid(); // Draw the gridlines
  85
  86         glMatrixMode(GL_PROJECTION);
  87         glLoadIdentity();
  88         if (m_use_gpu_transform)
  89         {
  90                 glOrtho(Float(m_bounds.x), Float(m_bounds.x)+Float(m_bounds.w), Float(m_bounds.y) + Float(m_bounds.h), Float(m_bounds.y), -1.f, 1.f);
  91         }
  92         else
  93         {
  94                 glOrtho(0,1,1,0,-1,1);
  95         }
  96         glMatrixMode(GL_MODELVIEW);
  97         glLoadIdentity();
  98
  99         if (m_colour.a < 1.0f)
 100         {
 101                 glEnable(GL_BLEND);
 102                 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 103         }
 104         glColor4f(m_colour.r, m_colour.g, m_colour.b, m_colour.a);
 105         glBegin(GL_QUADS);
 106         for (unsigned id = 0; id < m_document.ObjectCount(); ++id)
 107         {
 108                 if (m_document.m_objects.types[id] != RECT_FILLED)
 109                         continue;
 110                 Rect obj_bounds;
 111                 if (m_use_gpu_transform)
 112                 {
 113                         obj_bounds = m_document.m_objects.bounds[id];
 114                 }
 115                 else
 116                 {
 117                         obj_bounds = TransformToViewCoords(m_document.m_objects.bounds[id]);
 118                 }
 119                 glVertex2f(Float(obj_bounds.x), Float(obj_bounds.y));
 120                 glVertex2f(Float(obj_bounds.x) + Float(obj_bounds.w), Float(obj_bounds.y));
 121                 glVertex2f(Float(obj_bounds.x) + Float(obj_bounds.w), Float(obj_bounds.y) + Float(obj_bounds.h));
 122                 glVertex2f(Float(obj_bounds.x), Float(obj_bounds.y) + Float(obj_bounds.h));
 123         }
 124         glEnd();
 125
 126
 127         for (unsigned id = 0; id < m_document.ObjectCount(); ++id)
 128         {
 129                 if (m_document.m_objects.types[id] != RECT_OUTLINE)
 130                         continue;
 131                 Rect obj_bounds;
 132                 if (m_use_gpu_transform)
 133                 {
 134                         obj_bounds = m_document.m_objects.bounds[id];
 135                 }
 136                 else
 137                 {
 138                         obj_bounds = TransformToViewCoords(m_document.m_objects.bounds[id]);
 139                 }
 140                 glBegin(GL_LINE_LOOP);
 141                 glVertex2f(Float(obj_bounds.x), Float(obj_bounds.y));
 142                 glVertex2f(Float(obj_bounds.x) + Float(obj_bounds.w), Float(obj_bounds.y));
 143                 glVertex2f(Float(obj_bounds.x) + Float(obj_bounds.w), Float(obj_bounds.y) + Float(obj_bounds.h));
 144                 glVertex2f(Float(obj_bounds.x), Float(obj_bounds.y) + Float(obj_bounds.h));
 145                 glEnd();
 146         }
 147
 148         if (m_colour.a < 1.0f)
 149         {
 150                 glDisable(GL_BLEND);
 151         }
 152
 153 }